微软原版SQLHelper类

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// Microsoft Data Access Application Block for .NET
// http://msdn.microsoft.com/library/en-us/dnbda/html/daab-rm.asp
//
// sqlHelper.cs
//
// This file contains the implementations of the sqlHelper and sqlHelperParameterCache
// classes.
//
// For more @R_435_4045@ion see the Data Access Application Block Implementation Overview. 
// ===============================================================================
// Release history
// VERSION    DESCRIPTION
//   2.0    Added support for FillDataset,UpdateDataset and "Param" helper methods
//
// ===============================================================================
// copyright (C) 2000-2001 Microsoft Corporation
// All rights reserved.
// THIS CODE AND @R_435_4045@ION IS PROVIDED "AS IS" WITHOUT WARRANTY
// OF ANY KIND,EITHER EXpressed OR IMPLIED,INCLUDING BUT NOT
// LIMITED TO THE IMPLIED WARRANTIES OF MERCHANTABILITY AND/OR
// fitness FOR A PARTIculaR PURPOSE.
// ==============================================================================


using System;
using System.Data;
using System.Xml;
using System.Data.sqlClient;
using System.Collections;


namespace Microsoft.ApplicationBlocks.Data
{
    /// <summary>
    /// The sqlHelper class is intended to encapsulate high performance,scalable best practices for 
    /// common uses of sqlClient
    /// </summary>
    public sealed class sqlHelper
    {
        #region private utility methods & constructors


        // Since this class provides only static methods,make the default constructor private to prevent 
        // instances from being created with "new sqlHelper()"
        private sqlHelper() {}


        /// <summary>
        /// This method is used to attach array of sqlParameters to a sqlCommand.
        /// 
        /// This method will assign a value of dbnull to any parameter with a direction of
        /// InputOutput and a value of null.  
        /// 
        /// This behavior will prevent default values from being used,but
        /// this will be the less common case than an intended pure output parameter (derived as InputOutput)
        /// where the user provided no input value.
        /// </summary>
        /// <param name="command">The command to which the parameters will be added</param>
        /// <param name="commandParameters">An array of sqlParameters to be added to command</param>
        private static void AttachParameters(sqlCommand command,sqlParameter[] commandParameters)
        {
            if( command == null ) throw new ArgumentNullException( "command" );
            if( commandParameters != null )
            {
                foreach (sqlParameter p in commandParameters)
                {
                    if( p != null )
                    {
                        // Check for derived output value with no value assigned
                        if ( ( p.Direction == ParameterDirection.InputOutput || 
                            p.Direction == ParameterDirection.Input ) && 
                            (p.Value == null))
                        {
                            p.Value = dbnull.Value;
                        }
                        command.Parameters.Add(p);
                    }
                }
            }
        }


        /// <summary>
        /// This method assigns daTarow column values to an array of sqlParameters
        /// </summary>
        /// <param name="commandParameters">Array of sqlParameters to be assigned values</param>
        /// <param name="daTarow">The daTarow used to hold the stored procedure's parameter values</param>
        private static void AssignParameterValues(sqlParameter[] commandParameters,DaTarow daTarow)
        {
            if ((commandParameters == null) || (daTarow == null)) 
            {
                // Do nothing if we get no data
                return;
            }


            int i = 0;
            // Set the parameters values
            foreach(sqlParameter commandParameter in commandParameters)
            {
                // Check the parameter name
                if( commandParameter.ParameterName == null || 
                    commandParameter.ParameterName.Length <= 1 )
                    throw new Exception( 
                        string.Format( 
                            "Please provide a valid parameter name on the parameter #{0},the ParameterName property has the following value: '{1}'.", 
                            i,commandParameter.ParameterName ) );
                if (daTarow.Table.Columns.IndexOf(commandParameter.ParameterName.Substring(1)) != -1)
                    commandParameter.Value = daTarow[commandParameter.ParameterName.Substring(1)];
                i++;
            }
        }


        /// <summary>
        /// This method assigns an array of values to an array of sqlParameters
        /// </summary>
        /// <param name="commandParameters">Array of sqlParameters to be assigned values</param>
        /// <param name="parameterValues">Array of objects holding the values to be assigned</param>
        private static void AssignParameterValues(sqlParameter[] commandParameters,object[] parameterValues)
        {
            if ((commandParameters == null) || (parameterValues == null)) 
            {
                // Do nothing if we get no data
                return;
            }


            // We must have the same number of values as we pave parameters to put them in
            if (commandParameters.Length != parameterValues.Length)
            {
                throw new ArgumentException("Parameter count does not match Parameter Value count.");
            }


            // Iterate through the sqlParameters,assigning the values from the corresponding position in the 
            // value array
            for (int i = 0,j = commandParameters.Length; i < j; i++)
            {
                // If the current array value derives from IDbDataParameter,then assign its Value property
                if (parameterValues[i] is IDbDataParameter)
                {
                    IDbDataParameter paramInstance = (IDbDataParameter)parameterValues[i];
                    if( paramInstance.Value == null )
                    {
                        commandParameters[i].Value = dbnull.Value; 
                    }
                    else
                    {
                        commandParameters[i].Value = paramInstance.Value;
                    }
                }
                else if (parameterValues[i] == null)
                {
                    commandParameters[i].Value = dbnull.Value;
                }
                else
                {
                    commandParameters[i].Value = parameterValues[i];
                }
            }
        }


        /// <summary>
        /// This method opens (if necessary) and assigns a connection,transaction,command type and parameters 
        /// to the provided command
        /// </summary>
        /// <param name="command">The sqlCommand to be prepared</param>
        /// <param name="connection">A valid sqlConnection,on which to execute this command</param>
        /// <param name="transaction">A valid sqlTransaction,or 'null'</param>
        /// <param name="commandType">The CommandType (stored procedure,text,etc.)</param>
        /// <param name="commandText">The stored procedure name or T-sql command</param>
        /// <param name="commandParameters">An array of sqlParameters to be associated with the command or 'null' if no parameters are required</param>
        /// <param name="mustCloseConnection"><c>true</c> if the connection was opened by the method,otherwose is false.</param>
        private static void PrepareCommand(sqlCommand command,sqlConnection connection,sqlTransaction transaction,CommandType commandType,string commandText,sqlParameter[] commandParameters,out bool mustCloseConnection )
        {
            if( command == null ) throw new ArgumentNullException( "command" );
            if( commandText == null || commandText.Length == 0 ) throw new ArgumentNullException( "commandText" );


            // If the provided connection is not open,we will open it
            if (connection.State != ConnectionState.Open)
            {
                mustCloseConnection = true;
                connection.open();
            }
            else
            {
                mustCloseConnection = false;
            }


            // Associate the connection with the command
            command.Connection = connection;


            // Set the command text (stored procedure name or sql statement)
            command.CommandText = commandText;


            // If we were provided a transaction,assign it
            if (transaction != null)
            {
                if( transaction.Connection == null ) throw new ArgumentException( "The transaction was rollbacked or commited,please provide an open transaction.","transaction" );
                command.Transaction = transaction;
            }


            // Set the command type
            command.CommandType = commandType;


            // Attach the command parameters if they are provided
            if (commandParameters != null)
            {
                AttachParameters(command,commandParameters);
            }
            return;
        }


        #endregion private utility methods & constructors


        #region ExecuteNonQuery


        /// <summary>
        /// Execute a sqlCommand (that returns no resultset and takes no parameters) against the database specified in 
        /// the connection string
        /// </summary>
        /// <remarks>
        /// e.g.:  
        ///  int result = ExecuteNonQuery(connString,CommandType.StoredProcedure,"PublishOrders");
        /// </remarks>
        /// <param name="connectionString">A valid connection string for a sqlConnection</param>
        /// <param name="commandType">The CommandType (stored procedure,etc.)</param>
        /// <param name="commandText">The stored procedure name or T-sql command</param>
        /// <returns>An int representing the number of rows affected by the command</returns>
        public static int ExecuteNonQuery(string connectionString,string commandText)
        {
            // Pass through the call providing null for the set of sqlParameters
            return ExecuteNonQuery(connectionString,commandType,commandText,(sqlParameter[])null);
        }


        /// <summary>
        /// Execute a sqlCommand (that returns no resultset) against the database specified in the connection string 
        /// using the provided parameters
        /// </summary>
        /// <remarks>
        /// e.g.:  
        ///  int result = ExecuteNonQuery(connString,"PublishOrders",new sqlParameter("@prodid",24));
        /// </remarks>
        /// <param name="connectionString">A valid connection string for a sqlConnection</param>
        /// <param name="commandType">The CommandType (stored procedure,etc.)</param>
        /// <param name="commandText">The stored procedure name or T-sql command</param>
        /// <param name="commandParameters">An array of sqlParamters used to execute the command</param>
        /// <returns>An int representing the number of rows affected by the command</returns>
        public static int ExecuteNonQuery(string connectionString,params sqlParameter[] commandParameters)
        {
            if( connectionString == null || connectionString.Length == 0 ) throw new ArgumentNullException( "connectionString" );


            // Create & open a sqlConnection,and dispose of it after we are done
            using (sqlConnection connection = new sqlConnection(connectionString))
            {
                connection.open();


                // Call the overload that takes a connection in place of the connection string
                return ExecuteNonQuery(connection,commandParameters);
            }
        }


        /// <summary>
        /// Execute a stored procedure via a sqlCommand (that returns no resultset) against the database specified in 
        /// the connection string using the provided parameter values.  This method will query the database to discover the parameters for the 
        /// stored procedure (the first time each stored procedure is called),and assign the values based on parameter order.
        /// </summary>
        /// <remarks>
        /// This method provides no access to output parameters or the stored procedure's return value parameter.
        /// 
        /// e.g.:  
        ///  int result = ExecuteNonQuery(connString,24,36);
        /// </remarks>
        /// <param name="connectionString">A valid connection string for a sqlConnection</param>
        /// <param name="spName">The name of the stored prcedure</param>
        /// <param name="parameterValues">An array of objects to be assigned as the input values of the stored procedure</param>
        /// <returns>An int representing the number of rows affected by the command</returns>
        public static int ExecuteNonQuery(string connectionString,string spName,params object[] parameterValues)
        {
            if( connectionString == null || connectionString.Length == 0 ) throw new ArgumentNullException( "connectionString" );
            if( spName == null || spName.Length == 0 ) throw new ArgumentNullException( "spName" );


            // If we receive parameter values,we need to figure out where they go
            if ((parameterValues != null) && (parameterValues.Length > 0)) 
            {
                // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
                sqlParameter[] commandParameters = sqlHelperParameterCache.GetSpParameterSet(connectionString,spName);


                // Assign the provided values to these parameters based on parameter order
                AssignParameterValues(commandParameters,parameterValues);


                // Call the overload that takes an array of sqlParameters
                return ExecuteNonQuery(connectionString,spName,commandParameters);
            }
            else 
            {
                // Otherwise we can just call the SP without params
                return ExecuteNonQuery(connectionString,spName);
            }
        }


        /// <summary>
        /// Execute a sqlCommand (that returns no resultset and takes no parameters) against the provided sqlConnection. 
        /// </summary>
        /// <remarks>
        /// e.g.:  
        ///  int result = ExecuteNonQuery(conn,"PublishOrders");
        /// </remarks>
        /// <param name="connection">A valid sqlConnection</param>
        /// <param name="commandType">The CommandType (stored procedure,etc.)</param>
        /// <param name="commandText">The stored procedure name or T-sql command</param>
        /// <returns>An int representing the number of rows affected by the command</returns>
        public static int ExecuteNonQuery(sqlConnection connection,string commandText)
        {
            // Pass through the call providing null for the set of sqlParameters
            return ExecuteNonQuery(connection,(sqlParameter[])null);
        }


        /// <summary>
        /// Execute a sqlCommand (that returns no resultset) against the specified sqlConnection 
        /// using the provided parameters.
        /// </summary>
        /// <remarks>
        /// e.g.:  
        ///  int result = ExecuteNonQuery(conn,24));
        /// </remarks>
        /// <param name="connection">A valid sqlConnection</param>
        /// <param name="commandType">The CommandType (stored procedure,etc.)</param>
        /// <param name="commandText">The stored procedure name or T-sql command</param>
        /// <param name="commandParameters">An array of sqlParamters used to execute the command</param>
        /// <returns>An int representing the number of rows affected by the command</returns>
        public static int ExecuteNonQuery(sqlConnection connection,params sqlParameter[] commandParameters)
        {    
            if( connection == null ) throw new ArgumentNullException( "connection" );


            // Create a command and prepare it for execution
            sqlCommand cmd = new sqlCommand();
            bool mustCloseConnection = false;
            PrepareCommand(cmd,connection,(sqlTransaction)null,commandParameters,out mustCloseConnection );
            
            // Finally,execute the command
            int retval = cmd.ExecuteNonQuery();
            
            // Detach the sqlParameters from the command object,so they can be used again
            cmd.Parameters.Clear();
            if( mustCloseConnection )
                connection.Close();
            return retval;
        }


        /// <summary>
        /// Execute a stored procedure via a sqlCommand (that returns no resultset) against the specified sqlConnection 
        /// using the provided parameter values.  This method will query the database to discover the parameters for the 
        /// stored procedure (the first time each stored procedure is called),and assign the values based on parameter order.
        /// </summary>
        /// <remarks>
        /// This method provides no access to output parameters or the stored procedure's return value parameter.
        /// 
        /// e.g.:  
        ///  int result = ExecuteNonQuery(conn,36);
        /// </remarks>
        /// <param name="connection">A valid sqlConnection</param>
        /// <param name="spName">The name of the stored procedure</param>
        /// <param name="parameterValues">An array of objects to be assigned as the input values of the stored procedure</param>
        /// <returns>An int representing the number of rows affected by the command</returns>
        public static int ExecuteNonQuery(sqlConnection connection,params object[] parameterValues)
        {
            if( connection == null ) throw new ArgumentNullException( "connection" );
            if( spName == null || spName.Length == 0 ) throw new ArgumentNullException( "spName" );


            // If we receive parameter values,we need to figure out where they go
            if ((parameterValues != null) && (parameterValues.Length > 0)) 
            {
                // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
                sqlParameter[] commandParameters = sqlHelperParameterCache.GetSpParameterSet(connection,parameterValues);


                // Call the overload that takes an array of sqlParameters
                return ExecuteNonQuery(connection,commandParameters);
            }
            else 
            {
                // Otherwise we can just call the SP without params
                return ExecuteNonQuery(connection,spName);
            }
        }


        /// <summary>
        /// Execute a sqlCommand (that returns no resultset and takes no parameters) against the provided sqlTransaction. 
        /// </summary>
        /// <remarks>
        /// e.g.:  
        ///  int result = ExecuteNonQuery(trans,"PublishOrders");
        /// </remarks>
        /// <param name="transaction">A valid sqlTransaction</param>
        /// <param name="commandType">The CommandType (stored procedure,etc.)</param>
        /// <param name="commandText">The stored procedure name or T-sql command</param>
        /// <returns>An int representing the number of rows affected by the command</returns>
        public static int ExecuteNonQuery(sqlTransaction transaction,string commandText)
        {
            // Pass through the call providing null for the set of sqlParameters
            return ExecuteNonQuery(transaction,(sqlParameter[])null);
        }


        /// <summary>
        /// Execute a sqlCommand (that returns no resultset) against the specified sqlTransaction
        /// using the provided parameters.
        /// </summary>
        /// <remarks>
        /// e.g.:  
        ///  int result = ExecuteNonQuery(trans,"Getorders",24));
        /// </remarks>
        /// <param name="transaction">A valid sqlTransaction</param>
        /// <param name="commandType">The CommandType (stored procedure,etc.)</param>
        /// <param name="commandText">The stored procedure name or T-sql command</param>
        /// <param name="commandParameters">An array of sqlParamters used to execute the command</param>
        /// <returns>An int representing the number of rows affected by the command</returns>
        public static int ExecuteNonQuery(sqlTransaction transaction,params sqlParameter[] commandParameters)
        {
            if( transaction == null ) throw new ArgumentNullException( "transaction" );
            if( transaction != null && transaction.Connection == null ) throw new ArgumentException( "The transaction was rollbacked or commited,"transaction" );


            // Create a command and prepare it for execution
            sqlCommand cmd = new sqlCommand();
            bool mustCloseConnection = false;
            PrepareCommand(cmd,transaction.Connection,out mustCloseConnection );
                
            // Finally,execute the command
            int retval = cmd.ExecuteNonQuery();
                
            // Detach the sqlParameters from the command object,so they can be used again
            cmd.Parameters.Clear();
            return retval;
        }


        /// <summary>
        /// Execute a stored procedure via a sqlCommand (that returns no resultset) against the specified 
        /// sqlTransaction using the provided parameter values.  This method will query the database to discover the parameters for the 
        /// stored procedure (the first time each stored procedure is called),trans,36);
        /// </remarks>
        /// <param name="transaction">A valid sqlTransaction</param>
        /// <param name="spName">The name of the stored procedure</param>
        /// <param name="parameterValues">An array of objects to be assigned as the input values of the stored procedure</param>
        /// <returns>An int representing the number of rows affected by the command</returns>
        public static int ExecuteNonQuery(sqlTransaction transaction,params object[] parameterValues)
        {
            if( transaction == null ) throw new ArgumentNullException( "transaction" );
            if( transaction != null && transaction.Connection == null ) throw new ArgumentException( "The transaction was rollbacked or commited,"transaction" );
            if( spName == null || spName.Length == 0 ) throw new ArgumentNullException( "spName" );


            // If we receive parameter values,we need to figure out where they go
            if ((parameterValues != null) && (parameterValues.Length > 0)) 
            {
                // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
                sqlParameter[] commandParameters = sqlHelperParameterCache.GetSpParameterSet(transaction.Connection,parameterValues);


                // Call the overload that takes an array of sqlParameters
                return ExecuteNonQuery(transaction,commandParameters);
            }
            else 
            {
                // Otherwise we can just call the SP without params
                return ExecuteNonQuery(transaction,spName);
            }
        }


        #endregion ExecuteNonQuery


        #region ExecuteDataset


        /// <summary>
        /// Execute a sqlCommand (that returns a resultset and takes no parameters) against the database specified in 
        /// the connection string. 
        /// </summary>
        /// <remarks>
        /// e.g.:  
        ///  DataSet ds = ExecuteDataset(connString,"Getorders");
        /// </remarks>
        /// <param name="connectionString">A valid connection string for a sqlConnection</param>
        /// <param name="commandType">The CommandType (stored procedure,etc.)</param>
        /// <param name="commandText">The stored procedure name or T-sql command</param>
        /// <returns>A dataset containing the resultset generated by the command</returns>
        public static DataSet ExecuteDataset(string connectionString,string commandText)
        {
            // Pass through the call providing null for the set of sqlParameters
            return ExecuteDataset(connectionString,(sqlParameter[])null);
        }


        /// <summary>
        /// Execute a sqlCommand (that returns a resultset) against the database specified in the connection string 
        /// using the provided parameters.
        /// </summary>
        /// <remarks>
        /// e.g.:  
        ///  DataSet ds = ExecuteDataset(connString,etc.)</param>
        /// <param name="commandText">The stored procedure name or T-sql command</param>
        /// <param name="commandParameters">An array of sqlParamters used to execute the command</param>
        /// <returns>A dataset containing the resultset generated by the command</returns>
        public static DataSet ExecuteDataset(string connectionString,and dispose of it after we are done
            using (sqlConnection connection = new sqlConnection(connectionString))
            {
                connection.open();


                // Call the overload that takes a connection in place of the connection string
                return ExecuteDataset(connection,commandParameters);
            }
        }


        /// <summary>
        /// Execute a stored procedure via a sqlCommand (that returns a resultset) against the database specified in 
        /// the connection string using the provided parameter values.  This method will query the database to discover the parameters for the 
        /// stored procedure (the first time each stored procedure is called),and assign the values based on parameter order.
        /// </summary>
        /// <remarks>
        /// This method provides no access to output parameters or the stored procedure's return value parameter.
        /// 
        /// e.g.:  
        ///  DataSet ds = ExecuteDataset(connString,36);
        /// </remarks>
        /// <param name="connectionString">A valid connection string for a sqlConnection</param>
        /// <param name="spName">The name of the stored procedure</param>
        /// <param name="parameterValues">An array of objects to be assigned as the input values of the stored procedure</param>
        /// <returns>A dataset containing the resultset generated by the command</returns>
        public static DataSet ExecuteDataset(string connectionString,params object[] parameterValues)
        {
            if( connectionString == null || connectionString.Length == 0 ) throw new ArgumentNullException( "connectionString" );
            if( spName == null || spName.Length == 0 ) throw new ArgumentNullException( "spName" );
            
            // If we receive parameter values,parameterValues);


                // Call the overload that takes an array of sqlParameters
                return ExecuteDataset(connectionString,commandParameters);
            }
            else 
            {
                // Otherwise we can just call the SP without params
                return ExecuteDataset(connectionString,spName);
            }
        }


        /// <summary>
        /// Execute a sqlCommand (that returns a resultset and takes no parameters) against the provided sqlConnection. 
        /// </summary>
        /// <remarks>
        /// e.g.:  
        ///  DataSet ds = ExecuteDataset(conn,"Getorders");
        /// </remarks>
        /// <param name="connection">A valid sqlConnection</param>
        /// <param name="commandType">The CommandType (stored procedure,etc.)</param>
        /// <param name="commandText">The stored procedure name or T-sql command</param>
        /// <returns>A dataset containing the resultset generated by the command</returns>
        public static DataSet ExecuteDataset(sqlConnection connection,string commandText)
        {
            // Pass through the call providing null for the set of sqlParameters
            return ExecuteDataset(connection,(sqlParameter[])null);
        }
        
        /// <summary>
        /// Execute a sqlCommand (that returns a resultset) against the specified sqlConnection 
        /// using the provided parameters.
        /// </summary>
        /// <remarks>
        /// e.g.:  
        ///  DataSet ds = ExecuteDataset(conn,etc.)</param>
        /// <param name="commandText">The stored procedure name or T-sql command</param>
        /// <param name="commandParameters">An array of sqlParamters used to execute the command</param>
        /// <returns>A dataset containing the resultset generated by the command</returns>
        public static DataSet ExecuteDataset(sqlConnection connection,params sqlParameter[] commandParameters)
        {
            if( connection == null ) throw new ArgumentNullException( "connection" );


            // Create a command and prepare it for execution
            sqlCommand cmd = new sqlCommand();
            bool mustCloseConnection = false;
            PrepareCommand(cmd,out mustCloseConnection );
                
            // Create the DataAdapter & DataSet
            using( sqlDataAdapter da = new sqlDataAdapter(cmd) )
            {
                DataSet ds = new DataSet();


                // Fill the DataSet using default values for DataTable names,etc
                da.Fill(ds);
                
                // Detach the sqlParameters from the command object,so they can be used again
                cmd.Parameters.Clear();


                if( mustCloseConnection )
                    connection.Close();


                // Return the dataset
                return ds;
            }    
        }
        
        /// <summary>
        /// Execute a stored procedure via a sqlCommand (that returns a resultset) against the specified sqlConnection 
        /// using the provided parameter values.  This method will query the database to discover the parameters for the 
        /// stored procedure (the first time each stored procedure is called),and assign the values based on parameter order.
        /// </summary>
        /// <remarks>
        /// This method provides no access to output parameters or the stored procedure's return value parameter.
        /// 
        /// e.g.:  
        ///  DataSet ds = ExecuteDataset(conn,36);
        /// </remarks>
        /// <param name="connection">A valid sqlConnection</param>
        /// <param name="spName">The name of the stored procedure</param>
        /// <param name="parameterValues">An array of objects to be assigned as the input values of the stored procedure</param>
        /// <returns>A dataset containing the resultset generated by the command</returns>
        public static DataSet ExecuteDataset(sqlConnection connection,parameterValues);


                // Call the overload that takes an array of sqlParameters
                return ExecuteDataset(connection,commandParameters);
            }
            else 
            {
                // Otherwise we can just call the SP without params
                return ExecuteDataset(connection,spName);
            }
        }


        /// <summary>
        /// Execute a sqlCommand (that returns a resultset and takes no parameters) against the provided sqlTransaction. 
        /// </summary>
        /// <remarks>
        /// e.g.:  
        ///  DataSet ds = ExecuteDataset(trans,"Getorders");
        /// </remarks>
        /// <param name="transaction">A valid sqlTransaction</param>
        /// <param name="commandType">The CommandType (stored procedure,etc.)</param>
        /// <param name="commandText">The stored procedure name or T-sql command</param>
        /// <returns>A dataset containing the resultset generated by the command</returns>
        public static DataSet ExecuteDataset(sqlTransaction transaction,string commandText)
        {
            // Pass through the call providing null for the set of sqlParameters
            return ExecuteDataset(transaction,(sqlParameter[])null);
        }
        
        /// <summary>
        /// Execute a sqlCommand (that returns a resultset) against the specified sqlTransaction
        /// using the provided parameters.
        /// </summary>
        /// <remarks>
        /// e.g.:  
        ///  DataSet ds = ExecuteDataset(trans,etc.)</param>
        /// <param name="commandText">The stored procedure name or T-sql command</param>
        /// <param name="commandParameters">An array of sqlParamters used to execute the command</param>
        /// <returns>A dataset containing the resultset generated by the command</returns>
        public static DataSet ExecuteDataset(sqlTransaction transaction,so they can be used again
                cmd.Parameters.Clear();


                // Return the dataset
                return ds;
            }    
        }
        
        /// <summary>
        /// Execute a stored procedure via a sqlCommand (that returns a resultset) against the specified 
        /// sqlTransaction using the provided parameter values.  This method will query the database to discover the parameters for the 
        /// stored procedure (the first time each stored procedure is called),and assign the values based on parameter order.
        /// </summary>
        /// <remarks>
        /// This method provides no access to output parameters or the stored procedure's return value parameter.
        /// 
        /// e.g.:  
        ///  DataSet ds = ExecuteDataset(trans,36);
        /// </remarks>
        /// <param name="transaction">A valid sqlTransaction</param>
        /// <param name="spName">The name of the stored procedure</param>
        /// <param name="parameterValues">An array of objects to be assigned as the input values of the stored procedure</param>
        /// <returns>A dataset containing the resultset generated by the command</returns>
        public static DataSet ExecuteDataset(sqlTransaction transaction,"transaction" );
            if( spName == null || spName.Length == 0 ) throw new ArgumentNullException( "spName" );
            
            // If we receive parameter values,parameterValues);


                // Call the overload that takes an array of sqlParameters
                return ExecuteDataset(transaction,commandParameters);
            }
            else 
            {
                // Otherwise we can just call the SP without params
                return ExecuteDataset(transaction,spName);
            }
        }


        #endregion ExecuteDataset
        
        #region ExecuteReader


        /// <summary>
        /// This enum is used to indicate whether the connection was provided by the caller,or created by sqlHelper,so that
        /// we can set the appropriate CommandBehavior when calling ExecuteReader()
        /// </summary>
        private enum sqlConnectioNownership    
        {
            /// <summary>Connection is owned and managed by sqlHelper</summary>
            Internal, 
            /// <summary>Connection is owned and managed by the caller</summary>
            External
        }


        /// <summary>
        /// Create and prepare a sqlCommand,and call ExecuteReader with the appropriate CommandBehavior.
        /// </summary>
        /// <remarks>
        /// If we created and opened the connection,we want the connection to be closed when the DataReader is closed.
        /// 
        /// If the caller provided the connection,we want to leave it to them to manage.
        /// </remarks>
        /// <param name="connection">A valid sqlConnection,etc.)</param>
        /// <param name="commandText">The stored procedure name or T-sql command</param>
        /// <param name="commandParameters">An array of sqlParameters to be associated with the command or 'null' if no parameters are required</param>
        /// <param name="connectioNownership">Indicates whether the connection parameter was provided by the caller,or created by sqlHelper</param>
        /// <returns>sqlDataReader containing the results of the command</returns>
        private static sqlDataReader ExecuteReader(sqlConnection connection,sqlConnectioNownership connectioNownership)
        {    
            if( connection == null ) throw new ArgumentNullException( "connection" );


            bool mustCloseConnection = false;
            // Create a command and prepare it for execution
            sqlCommand cmd = new sqlCommand();
            try
            {
                PrepareCommand(cmd,out mustCloseConnection );
            
                // Create a reader
                sqlDataReader dataReader;


                // Call ExecuteReader with the appropriate CommandBehavior
                if (connectioNownership == sqlConnectioNownership.External)
                {
                    dataReader = cmd.ExecuteReader();
                }
                else
                {
                    dataReader = cmd.ExecuteReader(CommandBehavior.CloseConnection);
                }
            
                // Detach the sqlParameters from the command object,so they can be used again.
                // HACK: There is a problem here,the output parameter values are fletched 
                // when the reader is closed,so if the parameters are detached from the command
                // then the sqlReader can磘 set its values. 
                // When this happen,the parameters can磘 be used again in other command.
                bool canClear = true;
                foreach(sqlParameter commandParameter in cmd.Parameters)
                {
                    if (commandParameter.Direction != ParameterDirection.Input)
                        canClear = false;
                }
            
                if (canClear)
                {
                    cmd.Parameters.Clear();
                }


                return dataReader;
            }
            catch
            {
                if( mustCloseConnection )
                    connection.Close();
                throw;
            }
        }


        /// <summary>
        /// Execute a sqlCommand (that returns a resultset and takes no parameters) against the database specified in 
        /// the connection string. 
        /// </summary>
        /// <remarks>
        /// e.g.:  
        ///  sqlDataReader dr = ExecuteReader(connString,etc.)</param>
        /// <param name="commandText">The stored procedure name or T-sql command</param>
        /// <returns>A sqlDataReader containing the resultset generated by the command</returns>
        public static sqlDataReader ExecuteReader(string connectionString,string commandText)
        {
            // Pass through the call providing null for the set of sqlParameters
            return ExecuteReader(connectionString,(sqlParameter[])null);
        }


        /// <summary>
        /// Execute a sqlCommand (that returns a resultset) against the database specified in the connection string 
        /// using the provided parameters.
        /// </summary>
        /// <remarks>
        /// e.g.:  
        ///  sqlDataReader dr = ExecuteReader(connString,etc.)</param>
        /// <param name="commandText">The stored procedure name or T-sql command</param>
        /// <param name="commandParameters">An array of sqlParamters used to execute the command</param>
        /// <returns>A sqlDataReader containing the resultset generated by the command</returns>
        public static sqlDataReader ExecuteReader(string connectionString,params sqlParameter[] commandParameters)
        {
            if( connectionString == null || connectionString.Length == 0 ) throw new ArgumentNullException( "connectionString" );
            sqlConnection connection = null;
            try
            {
                connection = new sqlConnection(connectionString);
                connection.open();


                // Call the private overload that takes an internally owned connection in place of the connection string
                return ExecuteReader(connection,null,sqlConnectioNownership.Internal);
            }
            catch
            {
                // If we fail to return the sqlDatReader,we need to close the connection ourselves
                if( connection != null ) connection.Close();
                throw;
            }
            
        }


        /// <summary>
        /// Execute a stored procedure via a sqlCommand (that returns a resultset) against the database specified in 
        /// the connection string using the provided parameter values.  This method will query the database to discover the parameters for the 
        /// stored procedure (the first time each stored procedure is called),and assign the values based on parameter order.
        /// </summary>
        /// <remarks>
        /// This method provides no access to output parameters or the stored procedure's return value parameter.
        /// 
        /// e.g.:  
        ///  sqlDataReader dr = ExecuteReader(connString,36);
        /// </remarks>
        /// <param name="connectionString">A valid connection string for a sqlConnection</param>
        /// <param name="spName">The name of the stored procedure</param>
        /// <param name="parameterValues">An array of objects to be assigned as the input values of the stored procedure</param>
        /// <returns>A sqlDataReader containing the resultset generated by the command</returns>
        public static sqlDataReader ExecuteReader(string connectionString,we need to figure out where they go
            if ((parameterValues != null) && (parameterValues.Length > 0)) 
            {
                sqlParameter[] commandParameters = sqlHelperParameterCache.GetSpParameterSet(connectionString,spName);


                AssignParameterValues(commandParameters,parameterValues);


                return ExecuteReader(connectionString,commandParameters);
            }
            else 
            {
                // Otherwise we can just call the SP without params
                return ExecuteReader(connectionString,spName);
            }
        }


        /// <summary>
        /// Execute a sqlCommand (that returns a resultset and takes no parameters) against the provided sqlConnection. 
        /// </summary>
        /// <remarks>
        /// e.g.:  
        ///  sqlDataReader dr = ExecuteReader(conn,etc.)</param>
        /// <param name="commandText">The stored procedure name or T-sql command</param>
        /// <returns>A sqlDataReader containing the resultset generated by the command</returns>
        public static sqlDataReader ExecuteReader(sqlConnection connection,string commandText)
        {
            // Pass through the call providing null for the set of sqlParameters
            return ExecuteReader(connection,(sqlParameter[])null);
        }


        /// <summary>
        /// Execute a sqlCommand (that returns a resultset) against the specified sqlConnection 
        /// using the provided parameters.
        /// </summary>
        /// <remarks>
        /// e.g.:  
        ///  sqlDataReader dr = ExecuteReader(conn,etc.)</param>
        /// <param name="commandText">The stored procedure name or T-sql command</param>
        /// <param name="commandParameters">An array of sqlParamters used to execute the command</param>
        /// <returns>A sqlDataReader containing the resultset generated by the command</returns>
        public static sqlDataReader ExecuteReader(sqlConnection connection,params sqlParameter[] commandParameters)
        {
            // Pass through the call to the private overload using a null transaction value and an externally owned connection
            return ExecuteReader(connection,sqlConnectioNownership.External);
        }


        /// <summary>
        /// Execute a stored procedure via a sqlCommand (that returns a resultset) against the specified sqlConnection 
        /// using the provided parameter values.  This method will query the database to discover the parameters for the 
        /// stored procedure (the first time each stored procedure is called),and assign the values based on parameter order.
        /// </summary>
        /// <remarks>
        /// This method provides no access to output parameters or the stored procedure's return value parameter.
        /// 
        /// e.g.:  
        ///  sqlDataReader dr = ExecuteReader(conn,36);
        /// </remarks>
        /// <param name="connection">A valid sqlConnection</param>
        /// <param name="spName">The name of the stored procedure</param>
        /// <param name="parameterValues">An array of objects to be assigned as the input values of the stored procedure</param>
        /// <returns>A sqlDataReader containing the resultset generated by the command</returns>
        public static sqlDataReader ExecuteReader(sqlConnection connection,we need to figure out where they go
            if ((parameterValues != null) && (parameterValues.Length > 0)) 
            {
                sqlParameter[] commandParameters = sqlHelperParameterCache.GetSpParameterSet(connection,parameterValues);


                return ExecuteReader(connection,commandParameters);
            }
            else 
            {
                // Otherwise we can just call the SP without params
                return ExecuteReader(connection,spName);
            }
        }


        /// <summary>
        /// Execute a sqlCommand (that returns a resultset and takes no parameters) against the provided sqlTransaction. 
        /// </summary>
        /// <remarks>
        /// e.g.:  
        ///  sqlDataReader dr = ExecuteReader(trans,etc.)</param>
        /// <param name="commandText">The stored procedure name or T-sql command</param>
        /// <returns>A sqlDataReader containing the resultset generated by the command</returns>
        public static sqlDataReader ExecuteReader(sqlTransaction transaction,string commandText)
        {
            // Pass through the call providing null for the set of sqlParameters
            return ExecuteReader(transaction,(sqlParameter[])null);
        }


        /// <summary>
        /// Execute a sqlCommand (that returns a resultset) against the specified sqlTransaction
        /// using the provided parameters.
        /// </summary>
        /// <remarks>
        /// e.g.:  
        ///   sqlDataReader dr = ExecuteReader(trans,etc.)</param>
        /// <param name="commandText">The stored procedure name or T-sql command</param>
        /// <param name="commandParameters">An array of sqlParamters used to execute the command</param>
        /// <returns>A sqlDataReader containing the resultset generated by the command</returns>
        public static sqlDataReader ExecuteReader(sqlTransaction transaction,"transaction" );


            // Pass through to private overload,indicating that the connection is owned by the caller
            return ExecuteReader(transaction.Connection,sqlConnectioNownership.External);
        }


        /// <summary>
        /// Execute a stored procedure via a sqlCommand (that returns a resultset) against the specified
        /// sqlTransaction using the provided parameter values.  This method will query the database to discover the parameters for the 
        /// stored procedure (the first time each stored procedure is called),and assign the values based on parameter order.
        /// </summary>
        /// <remarks>
        /// This method provides no access to output parameters or the stored procedure's return value parameter.
        /// 
        /// e.g.:  
        ///  sqlDataReader dr = ExecuteReader(trans,36);
        /// </remarks>
        /// <param name="transaction">A valid sqlTransaction</param>
        /// <param name="spName">The name of the stored procedure</param>
        /// <param name="parameterValues">An array of objects to be assigned as the input values of the stored procedure</param>
        /// <returns>A sqlDataReader containing the resultset generated by the command</returns>
        public static sqlDataReader ExecuteReader(sqlTransaction transaction,we need to figure out where they go
            if ((parameterValues != null) && (parameterValues.Length > 0)) 
            {
                sqlParameter[] commandParameters = sqlHelperParameterCache.GetSpParameterSet(transaction.Connection,parameterValues);


                return ExecuteReader(transaction,commandParameters);
            }
            else 
            {
                // Otherwise we can just call the SP without params
                return ExecuteReader(transaction,spName);
            }
        }


        #endregion ExecuteReader


        #region ExecuteScalar
        
        /// <summary>
        /// Execute a sqlCommand (that returns a 1x1 resultset and takes no parameters) against the database specified in 
        /// the connection string. 
        /// </summary>
        /// <remarks>
        /// e.g.:  
        ///  int orderCount = (int)ExecuteScalar(connString,"GetorderCount");
        /// </remarks>
        /// <param name="connectionString">A valid connection string for a sqlConnection</param>
        /// <param name="commandType">The CommandType (stored procedure,etc.)</param>
        /// <param name="commandText">The stored procedure name or T-sql command</param>
        /// <returns>An object containing the value in the 1x1 resultset generated by the command</returns>
        public static object ExecuteScalar(string connectionString,string commandText)
        {
            // Pass through the call providing null for the set of sqlParameters
            return ExecuteScalar(connectionString,(sqlParameter[])null);
        }


        /// <summary>
        /// Execute a sqlCommand (that returns a 1x1 resultset) against the database specified in the connection string 
        /// using the provided parameters.
        /// </summary>
        /// <remarks>
        /// e.g.:  
        ///  int orderCount = (int)ExecuteScalar(connString,"GetorderCount",etc.)</param>
        /// <param name="commandText">The stored procedure name or T-sql command</param>
        /// <param name="commandParameters">An array of sqlParamters used to execute the command</param>
        /// <returns>An object containing the value in the 1x1 resultset generated by the command</returns>
        public static object ExecuteScalar(string connectionString,params sqlParameter[] commandParameters)
        {
            if( connectionString == null || connectionString.Length == 0 ) throw new ArgumentNullException( "connectionString" );
            // Create & open a sqlConnection,and dispose of it after we are done
            using (sqlConnection connection = new sqlConnection(connectionString))
            {
                connection.open();


                // Call the overload that takes a connection in place of the connection string
                return ExecuteScalar(connection,commandParameters);
            }
        }


        /// <summary>
        /// Execute a stored procedure via a sqlCommand (that returns a 1x1 resultset) against the database specified in 
        /// the connection string using the provided parameter values.  This method will query the database to discover the parameters for the 
        /// stored procedure (the first time each stored procedure is called),and assign the values based on parameter order.
        /// </summary>
        /// <remarks>
        /// This method provides no access to output parameters or the stored procedure's return value parameter.
        /// 
        /// e.g.:  
        ///  int orderCount = (int)ExecuteScalar(connString,36);
        /// </remarks>
        /// <param name="connectionString">A valid connection string for a sqlConnection</param>
        /// <param name="spName">The name of the stored procedure</param>
        /// <param name="parameterValues">An array of objects to be assigned as the input values of the stored procedure</param>
        /// <returns>An object containing the value in the 1x1 resultset generated by the command</returns>
        public static object ExecuteScalar(string connectionString,parameterValues);


                // Call the overload that takes an array of sqlParameters
                return ExecuteScalar(connectionString,commandParameters);
            }
            else 
            {
                // Otherwise we can just call the SP without params
                return ExecuteScalar(connectionString,spName);
            }
        }


        /// <summary>
        /// Execute a sqlCommand (that returns a 1x1 resultset and takes no parameters) against the provided sqlConnection. 
        /// </summary>
        /// <remarks>
        /// e.g.:  
        ///  int orderCount = (int)ExecuteScalar(conn,"GetorderCount");
        /// </remarks>
        /// <param name="connection">A valid sqlConnection</param>
        /// <param name="commandType">The CommandType (stored procedure,etc.)</param>
        /// <param name="commandText">The stored procedure name or T-sql command</param>
        /// <returns>An object containing the value in the 1x1 resultset generated by the command</returns>
        public static object ExecuteScalar(sqlConnection connection,string commandText)
        {
            // Pass through the call providing null for the set of sqlParameters
            return ExecuteScalar(connection,(sqlParameter[])null);
        }


        /// <summary>
        /// Execute a sqlCommand (that returns a 1x1 resultset) against the specified sqlConnection 
        /// using the provided parameters.
        /// </summary>
        /// <remarks>
        /// e.g.:  
        ///  int orderCount = (int)ExecuteScalar(conn,etc.)</param>
        /// <param name="commandText">The stored procedure name or T-sql command</param>
        /// <param name="commandParameters">An array of sqlParamters used to execute the command</param>
        /// <returns>An object containing the value in the 1x1 resultset generated by the command</returns>
        public static object ExecuteScalar(sqlConnection connection,params sqlParameter[] commandParameters)
        {
            if( connection == null ) throw new ArgumentNullException( "connection" );


            // Create a command and prepare it for execution
            sqlCommand cmd = new sqlCommand();


            bool mustCloseConnection = false;
            PrepareCommand(cmd,out mustCloseConnection );
                
            // Execute the command & return the results
            object retval = cmd.ExecuteScalar();
                
            // Detach the sqlParameters from the command object,so they can be used again
            cmd.Parameters.Clear();


            if( mustCloseConnection )
                connection.Close();


            return retval;
        }


        /// <summary>
        /// Execute a stored procedure via a sqlCommand (that returns a 1x1 resultset) against the specified sqlConnection 
        /// using the provided parameter values.  This method will query the database to discover the parameters for the 
        /// stored procedure (the first time each stored procedure is called),and assign the values based on parameter order.
        /// </summary>
        /// <remarks>
        /// This method provides no access to output parameters or the stored procedure's return value parameter.
        /// 
        /// e.g.:  
        ///  int orderCount = (int)ExecuteScalar(conn,36);
        /// </remarks>
        /// <param name="connection">A valid sqlConnection</param>
        /// <param name="spName">The name of the stored procedure</param>
        /// <param name="parameterValues">An array of objects to be assigned as the input values of the stored procedure</param>
        /// <returns>An object containing the value in the 1x1 resultset generated by the command</returns>
        public static object ExecuteScalar(sqlConnection connection,parameterValues);


                // Call the overload that takes an array of sqlParameters
                return ExecuteScalar(connection,commandParameters);
            }
            else 
            {
                // Otherwise we can just call the SP without params
                return ExecuteScalar(connection,spName);
            }
        }


        /// <summary>
        /// Execute a sqlCommand (that returns a 1x1 resultset and takes no parameters) against the provided sqlTransaction. 
        /// </summary>
        /// <remarks>
        /// e.g.:  
        ///  int orderCount = (int)ExecuteScalar(trans,"GetorderCount");
        /// </remarks>
        /// <param name="transaction">A valid sqlTransaction</param>
        /// <param name="commandType">The CommandType (stored procedure,etc.)</param>
        /// <param name="commandText">The stored procedure name or T-sql command</param>
        /// <returns>An object containing the value in the 1x1 resultset generated by the command</returns>
        public static object ExecuteScalar(sqlTransaction transaction,string commandText)
        {
            // Pass through the call providing null for the set of sqlParameters
            return ExecuteScalar(transaction,(sqlParameter[])null);
        }


        /// <summary>
        /// Execute a sqlCommand (that returns a 1x1 resultset) against the specified sqlTransaction
        /// using the provided parameters.
        /// </summary>
        /// <remarks>
        /// e.g.:  
        ///  int orderCount = (int)ExecuteScalar(trans,etc.)</param>
        /// <param name="commandText">The stored procedure name or T-sql command</param>
        /// <param name="commandParameters">An array of sqlParamters used to execute the command</param>
        /// <returns>An object containing the value in the 1x1 resultset generated by the command</returns>
        public static object ExecuteScalar(sqlTransaction transaction,so they can be used again
            cmd.Parameters.Clear();
            return retval;
        }


        /// <summary>
        /// Execute a stored procedure via a sqlCommand (that returns a 1x1 resultset) against the specified
        /// sqlTransaction using the provided parameter values.  This method will query the database to discover the parameters for the 
        /// stored procedure (the first time each stored procedure is called),and assign the values based on parameter order.
        /// </summary>
        /// <remarks>
        /// This method provides no access to output parameters or the stored procedure's return value parameter.
        /// 
        /// e.g.:  
        ///  int orderCount = (int)ExecuteScalar(trans,36);
        /// </remarks>
        /// <param name="transaction">A valid sqlTransaction</param>
        /// <param name="spName">The name of the stored procedure</param>
        /// <param name="parameterValues">An array of objects to be assigned as the input values of the stored procedure</param>
        /// <returns>An object containing the value in the 1x1 resultset generated by the command</returns>
        public static object ExecuteScalar(sqlTransaction transaction,we need to figure out where they go
            if ((parameterValues != null) && (parameterValues.Length > 0)) 
            {
                // PPull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
                sqlParameter[] commandParameters = sqlHelperParameterCache.GetSpParameterSet(transaction.Connection,parameterValues);


                // Call the overload that takes an array of sqlParameters
                return ExecuteScalar(transaction,commandParameters);
            }
            else 
            {
                // Otherwise we can just call the SP without params
                return ExecuteScalar(transaction,spName);
            }
        }


        #endregion ExecuteScalar    


        #region ExecuteXmlReader
        /// <summary>
        /// Execute a sqlCommand (that returns a resultset and takes no parameters) against the provided sqlConnection. 
        /// </summary>
        /// <remarks>
        /// e.g.:  
        ///  XmlReader r = ExecuteXmlReader(conn,etc.)</param>
        /// <param name="commandText">The stored procedure name or T-sql command using "FOR XML AUTO"</param>
        /// <returns>An XmlReader containing the resultset generated by the command</returns>
        public static XmlReader ExecuteXmlReader(sqlConnection connection,string commandText)
        {
            // Pass through the call providing null for the set of sqlParameters
            return ExecuteXmlReader(connection,(sqlParameter[])null);
        }


        /// <summary>
        /// Execute a sqlCommand (that returns a resultset) against the specified sqlConnection 
        /// using the provided parameters.
        /// </summary>
        /// <remarks>
        /// e.g.:  
        ///  XmlReader r = ExecuteXmlReader(conn,etc.)</param>
        /// <param name="commandText">The stored procedure name or T-sql command using "FOR XML AUTO"</param>
        /// <param name="commandParameters">An array of sqlParamters used to execute the command</param>
        /// <returns>An XmlReader containing the resultset generated by the command</returns>
        public static XmlReader ExecuteXmlReader(sqlConnection connection,params sqlParameter[] commandParameters)
        {
            if( connection == null ) throw new ArgumentNullException( "connection" );


            bool mustCloseConnection = false;
            // Create a command and prepare it for execution
            sqlCommand cmd = new sqlCommand();
            try
            {
                PrepareCommand(cmd,out mustCloseConnection );
            
                // Create the DataAdapter & DataSet
                XmlReader retval = cmd.ExecuteXmlReader();
            
                // Detach the sqlParameters from the command object,so they can be used again
                cmd.Parameters.Clear();


                return retval;
            }
            catch
            {    
                if( mustCloseConnection )
                    connection.Close();
                throw;
            }
        }


        /// <summary>
        /// Execute a stored procedure via a sqlCommand (that returns a resultset) against the specified sqlConnection 
        /// using the provided parameter values.  This method will query the database to discover the parameters for the 
        /// stored procedure (the first time each stored procedure is called),and assign the values based on parameter order.
        /// </summary>
        /// <remarks>
        /// This method provides no access to output parameters or the stored procedure's return value parameter.
        /// 
        /// e.g.:  
        ///  XmlReader r = ExecuteXmlReader(conn,36);
        /// </remarks>
        /// <param name="connection">A valid sqlConnection</param>
        /// <param name="spName">The name of the stored procedure using "FOR XML AUTO"</param>
        /// <param name="parameterValues">An array of objects to be assigned as the input values of the stored procedure</param>
        /// <returns>An XmlReader containing the resultset generated by the command</returns>
        public static XmlReader ExecuteXmlReader(sqlConnection connection,parameterValues);


                // Call the overload that takes an array of sqlParameters
                return ExecuteXmlReader(connection,commandParameters);
            }
            else 
            {
                // Otherwise we can just call the SP without params
                return ExecuteXmlReader(connection,spName);
            }
        }


        /// <summary>
        /// Execute a sqlCommand (that returns a resultset and takes no parameters) against the provided sqlTransaction. 
        /// </summary>
        /// <remarks>
        /// e.g.:  
        ///  XmlReader r = ExecuteXmlReader(trans,etc.)</param>
        /// <param name="commandText">The stored procedure name or T-sql command using "FOR XML AUTO"</param>
        /// <returns>An XmlReader containing the resultset generated by the command</returns>
        public static XmlReader ExecuteXmlReader(sqlTransaction transaction,string commandText)
        {
            // Pass through the call providing null for the set of sqlParameters
            return ExecuteXmlReader(transaction,(sqlParameter[])null);
        }


        /// <summary>
        /// Execute a sqlCommand (that returns a resultset) against the specified sqlTransaction
        /// using the provided parameters.
        /// </summary>
        /// <remarks>
        /// e.g.:  
        ///  XmlReader r = ExecuteXmlReader(trans,etc.)</param>
        /// <param name="commandText">The stored procedure name or T-sql command using "FOR XML AUTO"</param>
        /// <param name="commandParameters">An array of sqlParamters used to execute the command</param>
        /// <returns>An XmlReader containing the resultset generated by the command</returns>
        public static XmlReader ExecuteXmlReader(sqlTransaction transaction,out mustCloseConnection );
            
            // Create the DataAdapter & DataSet
            XmlReader retval = cmd.ExecuteXmlReader();
            
            // Detach the sqlParameters from the command object,so they can be used again
            cmd.Parameters.Clear();
            return retval;            
        }


        /// <summary>
        /// Execute a stored procedure via a sqlCommand (that returns a resultset) against the specified 
        /// sqlTransaction using the provided parameter values.  This method will query the database to discover the parameters for the 
        /// stored procedure (the first time each stored procedure is called),and assign the values based on parameter order.
        /// </summary>
        /// <remarks>
        /// This method provides no access to output parameters or the stored procedure's return value parameter.
        /// 
        /// e.g.:  
        ///  XmlReader r = ExecuteXmlReader(trans,36);
        /// </remarks>
        /// <param name="transaction">A valid sqlTransaction</param>
        /// <param name="spName">The name of the stored procedure</param>
        /// <param name="parameterValues">An array of objects to be assigned as the input values of the stored procedure</param>
        /// <returns>A dataset containing the resultset generated by the command</returns>
        public static XmlReader ExecuteXmlReader(sqlTransaction transaction,parameterValues);


                // Call the overload that takes an array of sqlParameters
                return ExecuteXmlReader(transaction,commandParameters);
            }
            else 
            {
                // Otherwise we can just call the SP without params
                return ExecuteXmlReader(transaction,spName);
            }
        }


        #endregion ExecuteXmlReader


        #region FillDataset
        /// <summary>
        /// Execute a sqlCommand (that returns a resultset and takes no parameters) against the database specified in 
        /// the connection string. 
        /// </summary>
        /// <remarks>
        /// e.g.:  
        ///  FillDataset(connString,ds,new string[] {"orders"});
        /// </remarks>
        /// <param name="connectionString">A valid connection string for a sqlConnection</param>
        /// <param name="commandType">The CommandType (stored procedure,etc.)</param>
        /// <param name="commandText">The stored procedure name or T-sql command</param>
        /// <param name="dataSet">A dataset wich will contain the resultset generated by the command</param>
        /// <param name="tableNames">This array will be used to create table mappings allowing the DataTables to be referenced
        /// by a user defined name (probably the actual table name)</param>
        public static void FillDataset(string connectionString,DataSet dataSet,string[] tableNames)
        {
            if( connectionString == null || connectionString.Length == 0 ) throw new ArgumentNullException( "connectionString" );
            if( dataSet == null ) throw new ArgumentNullException( "dataSet" );
            
            // Create & open a sqlConnection,and dispose of it after we are done
            using (sqlConnection connection = new sqlConnection(connectionString))
            {
                connection.open();


                // Call the overload that takes a connection in place of the connection string
                FillDataset(connection,dataSet,tableNames);
            }
        }


        /// <summary>
        /// Execute a sqlCommand (that returns a resultset) against the database specified in the connection string 
        /// using the provided parameters.
        /// </summary>
        /// <remarks>
        /// e.g.:  
        ///  FillDataset(connString,new string[] {"orders"},etc.)</param>
        /// <param name="commandText">The stored procedure name or T-sql command</param>
        /// <param name="commandParameters">An array of sqlParamters used to execute the command</param>
        /// <param name="dataSet">A dataset wich will contain the resultset generated by the command</param>
        /// <param name="tableNames">This array will be used to create table mappings allowing the DataTables to be referenced
        /// by a user defined name (probably the actual table name)
        /// </param>
        public static void FillDataset(string connectionString,
            string commandText,string[] tableNames,
            params sqlParameter[] commandParameters)
        {
            if( connectionString == null || connectionString.Length == 0 ) throw new ArgumentNullException( "connectionString" );
            if( dataSet == null ) throw new ArgumentNullException( "dataSet" );
            // Create & open a sqlConnection,tableNames,and assign the values based on parameter order.
        /// </summary>
        /// <remarks>
        /// This method provides no access to output parameters or the stored procedure's return value parameter.
        /// 
        /// e.g.:  
        ///  FillDataset(connString,24);
        /// </remarks>
        /// <param name="connectionString">A valid connection string for a sqlConnection</param>
        /// <param name="spName">The name of the stored procedure</param>
        /// <param name="dataSet">A dataset wich will contain the resultset generated by the command</param>
        /// <param name="tableNames">This array will be used to create table mappings allowing the DataTables to be referenced
        /// by a user defined name (probably the actual table name)
        /// </param>    
        /// <param name="parameterValues">An array of objects to be assigned as the input values of the stored procedure</param>
        public static void FillDataset(string connectionString,
            DataSet dataSet,
            params object[] parameterValues)
        {
            if( connectionString == null || connectionString.Length == 0 ) throw new ArgumentNullException( "connectionString" );
            if( dataSet == null ) throw new ArgumentNullException( "dataSet" );
            // Create & open a sqlConnection,and dispose of it after we are done
            using (sqlConnection connection = new sqlConnection(connectionString))
            {
                connection.open();


                // Call the overload that takes a connection in place of the connection string
                FillDataset (connection,parameterValues);
            }
        }


        /// <summary>
        /// Execute a sqlCommand (that returns a resultset and takes no parameters) against the provided sqlConnection. 
        /// </summary>
        /// <remarks>
        /// e.g.:  
        ///  FillDataset(conn,new string[] {"orders"});
        /// </remarks>
        /// <param name="connection">A valid sqlConnection</param>
        /// <param name="commandType">The CommandType (stored procedure,etc.)</param>
        /// <param name="commandText">The stored procedure name or T-sql command</param>
        /// <param name="dataSet">A dataset wich will contain the resultset generated by the command</param>
        /// <param name="tableNames">This array will be used to create table mappings allowing the DataTables to be referenced
        /// by a user defined name (probably the actual table name)
        /// </param>    
        public static void FillDataset(sqlConnection connection, 
            string commandText,string[] tableNames)
        {
            FillDataset(connection,null);
        }


        /// <summary>
        /// Execute a sqlCommand (that returns a resultset) against the specified sqlConnection 
        /// using the provided parameters.
        /// </summary>
        /// <remarks>
        /// e.g.:  
        ///  FillDataset(conn,etc.)</param>
        /// <param name="commandText">The stored procedure name or T-sql command</param>
        /// <param name="dataSet">A dataset wich will contain the resultset generated by the command</param>
        /// <param name="tableNames">This array will be used to create table mappings allowing the DataTables to be referenced
        /// by a user defined name (probably the actual table name)
        /// </param>
        /// <param name="commandParameters">An array of sqlParamters used to execute the command</param>
        public static void FillDataset(sqlConnection connection,
            params sqlParameter[] commandParameters)
        {
            FillDataset(connection,commandParameters);
        }


        /// <summary>
        /// Execute a stored procedure via a sqlCommand (that returns a resultset) against the specified sqlConnection 
        /// using the provided parameter values.  This method will query the database to discover the parameters for the 
        /// stored procedure (the first time each stored procedure is called),and assign the values based on parameter order.
        /// </summary>
        /// <remarks>
        /// This method provides no access to output parameters or the stored procedure's return value parameter.
        /// 
        /// e.g.:  
        ///  FillDataset(conn,36);
        /// </remarks>
        /// <param name="connection">A valid sqlConnection</param>
        /// <param name="spName">The name of the stored procedure</param>
        /// <param name="dataSet">A dataset wich will contain the resultset generated by the command</param>
        /// <param name="tableNames">This array will be used to create table mappings allowing the DataTables to be referenced
        /// by a user defined name (probably the actual table name)
        /// </param>
        /// <param name="parameterValues">An array of objects to be assigned as the input values of the stored procedure</param>
        public static void FillDataset(sqlConnection connection, 
            DataSet dataSet,
            params object[] parameterValues)
        {
            if ( connection == null ) throw new ArgumentNullException( "connection" );
            if (dataSet == null ) throw new ArgumentNullException( "dataSet" );
            if( spName == null || spName.Length == 0 ) throw new ArgumentNullException( "spName" );


            // If we receive parameter values,parameterValues);


                // Call the overload that takes an array of sqlParameters
                FillDataset(connection,commandParameters);
            }
            else 
            {
                // Otherwise we can just call the SP without params
                FillDataset(connection,tableNames);
            }    
        }


        /// <summary>
        /// Execute a sqlCommand (that returns a resultset and takes no parameters) against the provided sqlTransaction. 
        /// </summary>
        /// <remarks>
        /// e.g.:  
        ///  FillDataset(trans,new string[] {"orders"});
        /// </remarks>
        /// <param name="transaction">A valid sqlTransaction</param>
        /// <param name="commandType">The CommandType (stored procedure,etc.)</param>
        /// <param name="commandText">The stored procedure name or T-sql command</param>
        /// <param name="dataSet">A dataset wich will contain the resultset generated by the command</param>
        /// <param name="tableNames">This array will be used to create table mappings allowing the DataTables to be referenced
        /// by a user defined name (probably the actual table name)
        /// </param>
        public static void FillDataset(sqlTransaction transaction,string[] tableNames)
        {
            FillDataset (transaction,null);    
        }


        /// <summary>
        /// Execute a sqlCommand (that returns a resultset) against the specified sqlTransaction
        /// using the provided parameters.
        /// </summary>
        /// <remarks>
        /// e.g.:  
        ///  FillDataset(trans,etc.)</param>
        /// <param name="commandText">The stored procedure name or T-sql command</param>
        /// <param name="dataSet">A dataset wich will contain the resultset generated by the command</param>
        /// <param name="tableNames">This array will be used to create table mappings allowing the DataTables to be referenced
        /// by a user defined name (probably the actual table name)
        /// </param>
        /// <param name="commandParameters">An array of sqlParamters used to execute the command</param>
        public static void FillDataset(sqlTransaction transaction,
            params sqlParameter[] commandParameters)
        {
            FillDataset(transaction.Connection,commandParameters);
        }


        /// <summary>
        /// Execute a stored procedure via a sqlCommand (that returns a resultset) against the specified 
        /// sqlTransaction using the provided parameter values.  This method will query the database to discover the parameters for the 
        /// stored procedure (the first time each stored procedure is called),and assign the values based on parameter order.
        /// </summary>
        /// <remarks>
        /// This method provides no access to output parameters or the stored procedure's return value parameter.
        /// 
        /// e.g.:  
        ///  FillDataset(trans,new string[]{"orders"},36);
        /// </remarks>
        /// <param name="transaction">A valid sqlTransaction</param>
        /// <param name="spName">The name of the stored procedure</param>
        /// <param name="dataSet">A dataset wich will contain the resultset generated by the command</param>
        /// <param name="tableNames">This array will be used to create table mappings allowing the DataTables to be referenced
        /// by a user defined name (probably the actual table name)
        /// </param>
        /// <param name="parameterValues">An array of objects to be assigned as the input values of the stored procedure</param>
        public static void FillDataset(sqlTransaction transaction,
            params object[] parameterValues) 
        {
            if( transaction == null ) throw new ArgumentNullException( "transaction" );
            if( transaction != null && transaction.Connection == null ) throw new ArgumentException( "The transaction was rollbacked or commited,"transaction" );
            if( dataSet == null ) throw new ArgumentNullException( "dataSet" );
            if( spName == null || spName.Length == 0 ) throw new ArgumentNullException( "spName" );


            // If we receive parameter values,parameterValues);


                // Call the overload that takes an array of sqlParameters
                FillDataset(transaction,commandParameters);
            }
            else 
            {
                // Otherwise we can just call the SP without params
                FillDataset(transaction,tableNames);
            }    
        }


        /// <summary>
        /// Private helper method that execute a sqlCommand (that returns a resultset) against the specified sqlTransaction and sqlConnection
        /// using the provided parameters.
        /// </summary>
        /// <remarks>
        /// e.g.:  
        ///  FillDataset(conn,24));
        /// </remarks>
        /// <param name="connection">A valid sqlConnection</param>
        /// <param name="transaction">A valid sqlTransaction</param>
        /// <param name="commandType">The CommandType (stored procedure,etc.)</param>
        /// <param name="commandText">The stored procedure name or T-sql command</param>
        /// <param name="dataSet">A dataset wich will contain the resultset generated by the command</param>
        /// <param name="tableNames">This array will be used to create table mappings allowing the DataTables to be referenced
        /// by a user defined name (probably the actual table name)
        /// </param>
        /// <param name="commandParameters">An array of sqlParamters used to execute the command</param>
        private static void FillDataset(sqlConnection connection,
            params sqlParameter[] commandParameters)
        {
            if( connection == null ) throw new ArgumentNullException( "connection" );
            if( dataSet == null ) throw new ArgumentNullException( "dataSet" );


            // Create a command and prepare it for execution
            sqlCommand command = new sqlCommand();
            bool mustCloseConnection = false;
            PrepareCommand(command,out mustCloseConnection );
                
            // Create the DataAdapter & DataSet
            using( sqlDataAdapter dataAdapter = new sqlDataAdapter(command) )
            {
                
                // Add the table mappings specified by the user
                if (tableNames != null && tableNames.Length > 0)
                {
                    string tableName = "Table";
                    for (int index=0; index < tableNames.Length; index++)
                    {
                        if( tableNames[index] == null || tableNames[index].Length == 0 ) throw new ArgumentException( "The tableNames parameter must contain a list of tables,a value was provided as null or empty string.","tableNames" );
                        dataAdapter.TableMappings.Add(tableName,tableNames[index]);
                        tableName += (index + 1).ToString();
                    }
                }
                
                // Fill the DataSet using default values for DataTable names,etc
                dataAdapter.Fill(dataSet);


                // Detach the sqlParameters from the command object,so they can be used again
                command.Parameters.Clear();
            }


            if( mustCloseConnection )
                connection.Close();
        }
        #endregion
        
        #region UpdateDataset
        /// <summary>
        /// Executes the respective command for each inserted,updated,or deleted row in the DataSet.
        /// </summary>
        /// <remarks>
        /// e.g.:  
        ///  UpdateDataset(conn,insertCommand,deleteCommand,updateCommand,"Order");
        /// </remarks>
        /// <param name="insertCommand">A valid transact-sql statement or stored procedure to insert new records into the data source</param>
        /// <param name="deleteCommand">A valid transact-sql statement or stored procedure to delete records from the data source</param>
        /// <param name="updateCommand">A valid transact-sql statement or stored procedure used to update records in the data source</param>
        /// <param name="dataSet">The DataSet used to update the data source</param>
        /// <param name="tableName">The DataTable used to update the data source.</param>
        public static void UpdateDataset(sqlCommand insertCommand,sqlCommand deleteCommand,sqlCommand updateCommand,string tableName)
        {
            if( insertCommand == null ) throw new ArgumentNullException( "insertCommand" );
            if( deleteCommand == null ) throw new ArgumentNullException( "deleteCommand" );
            if( updateCommand == null ) throw new ArgumentNullException( "updateCommand" );
            if( tableName == null || tableName.Length == 0 ) throw new ArgumentNullException( "tableName" ); 


            // Create a sqlDataAdapter,and dispose of it after we are done
            using (sqlDataAdapter dataAdapter = new sqlDataAdapter())
            {
                // Set the data adapter commands
                dataAdapter.UpdateCommand = updateCommand;
                dataAdapter.InsertCommand = insertCommand;
                dataAdapter.DeleteCommand = deleteCommand;


                // Update the dataset changes in the data source
                dataAdapter.Update (dataSet,tableName); 


                // Commit all the changes made to the DataSet
                dataSet.AcceptChanges();
            }
        }
        #endregion


        #region CreateCommand
        /// <summary>
        /// Simplify the creation of a sql command object by allowing
        /// a stored procedure and optional parameters to be provided
        /// </summary>
        /// <remarks>
        /// e.g.:  
        ///  sqlCommand command = CreateCommand(conn,"AddCustomer","CustomerID","CustomerName");
        /// </remarks>
        /// <param name="connection">A valid sqlConnection object</param>
        /// <param name="spName">The name of the stored procedure</param>
        /// <param name="sourceColumns">An array of string to be assigned as the source columns of the stored procedure parameters</param>
        /// <returns>A valid sqlCommand object</returns>
        public static sqlCommand CreateCommand(sqlConnection connection,params string[] sourceColumns) 
        {
            if( connection == null ) throw new ArgumentNullException( "connection" );
            if( spName == null || spName.Length == 0 ) throw new ArgumentNullException( "spName" );


            // Create a sqlCommand
            sqlCommand cmd = new sqlCommand( spName,connection );
            cmd.CommandType = CommandType.StoredProcedure;


            // If we receive parameter values,we need to figure out where they go
            if ((sourceColumns != null) && (sourceColumns.Length > 0)) 
            {
                // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
                sqlParameter[] commandParameters = sqlHelperParameterCache.GetSpParameterSet(connection,spName);


                // Assign the provided source columns to these parameters based on parameter order
                for (int index=0; index < sourceColumns.Length; index++)
                    commandParameters[index].sourceColumn = sourceColumns[index];


                // Attach the discovered parameters to the sqlCommand object
                AttachParameters (cmd,commandParameters);
            }


            return cmd;
        }
        #endregion


        #region ExecuteNonQueryTypedParams
        /// <summary>
        /// Execute a stored procedure via a sqlCommand (that returns no resultset) against the database specified in 
        /// the connection string using the daTarow column values as the stored procedure's parameters values.
        /// This method will query the database to discover the parameters for the 
        /// stored procedure (the first time each stored procedure is called),and assign the values based on row values.
        /// </summary>
        /// <param name="connectionString">A valid connection string for a sqlConnection</param>
        /// <param name="spName">The name of the stored procedure</param>
        /// <param name="daTarow">The daTarow used to hold the stored procedure's parameter values.</param>
        /// <returns>An int representing the number of rows affected by the command</returns>
        public static int ExecuteNonQueryTypedParams(String connectionString,String spName,DaTarow daTarow)
        {
            if( connectionString == null || connectionString.Length == 0 ) throw new ArgumentNullException( "connectionString" );
            if( spName == null || spName.Length == 0 ) throw new ArgumentNullException( "spName" );
            
            // If the row has values,the store procedure parameters must be initialized
            if (daTarow != null && daTarow.ItemArray.Length > 0)
            {
                // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
                sqlParameter[] commandParameters = sqlHelperParameterCache.GetSpParameterSet(connectionString,spName);
                
                // Set the parameters values
                AssignParameterValues(commandParameters,daTarow);
                                
                return sqlHelper.ExecuteNonQuery(connectionString,commandParameters);
            }
            else
            {
                return sqlHelper.ExecuteNonQuery(connectionString,spName);
            }
        }


        /// <summary>
        /// Execute a stored procedure via a sqlCommand (that returns no resultset) against the specified sqlConnection 
        /// using the daTarow column values as the stored procedure's parameters values.  
        /// This method will query the database to discover the parameters for the 
        /// stored procedure (the first time each stored procedure is called),and assign the values based on row values.
        /// </summary>
        /// <param name="connection">A valid sqlConnection object</param>
        /// <param name="spName">The name of the stored procedure</param>
        /// <param name="daTarow">The daTarow used to hold the stored procedure's parameter values.</param>
        /// <returns>An int representing the number of rows affected by the command</returns>
        public static int ExecuteNonQueryTypedParams(sqlConnection connection,DaTarow daTarow)
        {
            if( connection == null ) throw new ArgumentNullException( "connection" );
            if( spName == null || spName.Length == 0 ) throw new ArgumentNullException( "spName" );


            // If the row has values,the store procedure parameters must be initialized
            if (daTarow != null && daTarow.ItemArray.Length > 0)
            {
                // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
                sqlParameter[] commandParameters = sqlHelperParameterCache.GetSpParameterSet(connection,daTarow);
                                
                return sqlHelper.ExecuteNonQuery(connection,commandParameters);
            }
            else
            {
                return sqlHelper.ExecuteNonQuery(connection,spName);
            }
        }


        /// <summary>
        /// Execute a stored procedure via a sqlCommand (that returns no resultset) against the specified
        /// sqlTransaction using the daTarow column values as the stored procedure's parameters values.
        /// This method will query the database to discover the parameters for the 
        /// stored procedure (the first time each stored procedure is called),and assign the values based on row values.
        /// </summary>
        /// <param name="transaction">A valid sqlTransaction object</param>
        /// <param name="spName">The name of the stored procedure</param>
        /// <param name="daTarow">The daTarow used to hold the stored procedure's parameter values.</param>
        /// <returns>An int representing the number of rows affected by the command</returns>
        public static int ExecuteNonQueryTypedParams(sqlTransaction transaction,DaTarow daTarow)
        {
            if( transaction == null ) throw new ArgumentNullException( "transaction" );
            if( transaction != null && transaction.Connection == null ) throw new ArgumentException( "The transaction was rollbacked or commited,"transaction" );
            if( spName == null || spName.Length == 0 ) throw new ArgumentNullException( "spName" );


            // Sf the row has values,the store procedure parameters must be initialized
            if (daTarow != null && daTarow.ItemArray.Length > 0)
            {
                // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
                sqlParameter[] commandParameters = sqlHelperParameterCache.GetSpParameterSet(transaction.Connection,daTarow);
                                
                return sqlHelper.ExecuteNonQuery(transaction,commandParameters);
            }
            else
            {
                return sqlHelper.ExecuteNonQuery(transaction,spName);
            }
        }
        #endregion


        #region ExecuteDatasetTypedParams
        /// <summary>
        /// Execute a stored procedure via a sqlCommand (that returns a resultset) against the database specified in 
        /// the connection string using the daTarow column values as the stored procedure's parameters values.
        /// This method will query the database to discover the parameters for the 
        /// stored procedure (the first time each stored procedure is called),and assign the values based on row values.
        /// </summary>
        /// <param name="connectionString">A valid connection string for a sqlConnection</param>
        /// <param name="spName">The name of the stored procedure</param>
        /// <param name="daTarow">The daTarow used to hold the stored procedure's parameter values.</param>
        /// <returns>A dataset containing the resultset generated by the command</returns>
        public static DataSet ExecuteDatasetTypedParams(string connectionString,DaTarow daTarow)
        {
            if( connectionString == null || connectionString.Length == 0 ) throw new ArgumentNullException( "connectionString" );
            if( spName == null || spName.Length == 0 ) throw new ArgumentNullException( "spName" );


            //If the row has values,the store procedure parameters must be initialized
            if ( daTarow != null && daTarow.ItemArray.Length > 0)
            {
                // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
                sqlParameter[] commandParameters = sqlHelperParameterCache.GetSpParameterSet(connectionString,daTarow);
                
                return sqlHelper.ExecuteDataset(connectionString,commandParameters);
            }
            else
            {
                return sqlHelper.ExecuteDataset(connectionString,spName);
            }
        }


        /// <summary>
        /// Execute a stored procedure via a sqlCommand (that returns a resultset) against the specified sqlConnection 
        /// using the daTarow column values as the store procedure's parameters values.
        /// This method will query the database to discover the parameters for the 
        /// stored procedure (the first time each stored procedure is called),and assign the values based on row values.
        /// </summary>
        /// <param name="connection">A valid sqlConnection object</param>
        /// <param name="spName">The name of the stored procedure</param>
        /// <param name="daTarow">The daTarow used to hold the stored procedure's parameter values.</param>
        /// <returns>A dataset containing the resultset generated by the command</returns>
        public static DataSet ExecuteDatasetTypedParams(sqlConnection connection,the store procedure parameters must be initialized
            if( daTarow != null && daTarow.ItemArray.Length > 0)
            {
                // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
                sqlParameter[] commandParameters = sqlHelperParameterCache.GetSpParameterSet(connection,daTarow);
                
                return sqlHelper.ExecuteDataset(connection,commandParameters);
            }
            else
            {
                return sqlHelper.ExecuteDataset(connection,spName);
            }
        }


        /// <summary>
        /// Execute a stored procedure via a sqlCommand (that returns a resultset) against the specified sqlTransaction 
        /// using the daTarow column values as the stored procedure's parameters values.
        /// This method will query the database to discover the parameters for the 
        /// stored procedure (the first time each stored procedure is called),and assign the values based on row values.
        /// </summary>
        /// <param name="transaction">A valid sqlTransaction object</param>
        /// <param name="spName">The name of the stored procedure</param>
        /// <param name="daTarow">The daTarow used to hold the stored procedure's parameter values.</param>
        /// <returns>A dataset containing the resultset generated by the command</returns>
        public static DataSet ExecuteDatasetTypedParams(sqlTransaction transaction,"transaction" );
            if( spName == null || spName.Length == 0 ) throw new ArgumentNullException( "spName" );


            // If the row has values,the store procedure parameters must be initialized
            if( daTarow != null && daTarow.ItemArray.Length > 0)
            {
                // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
                sqlParameter[] commandParameters = sqlHelperParameterCache.GetSpParameterSet(transaction.Connection,daTarow);
                
                return sqlHelper.ExecuteDataset(transaction,commandParameters);
            }
            else
            {
                return sqlHelper.ExecuteDataset(transaction,spName);
            }
        }


        #endregion


        #region ExecuteReaderTypedParams
        /// <summary>
        /// Execute a stored procedure via a sqlCommand (that returns a resultset) against the database specified in 
        /// the connection string using the daTarow column values as the stored procedure's parameters values.
        /// This method will query the database to discover the parameters for the 
        /// stored procedure (the first time each stored procedure is called),and assign the values based on parameter order.
        /// </summary>
        /// <param name="connectionString">A valid connection string for a sqlConnection</param>
        /// <param name="spName">The name of the stored procedure</param>
        /// <param name="daTarow">The daTarow used to hold the stored procedure's parameter values.</param>
        /// <returns>A sqlDataReader containing the resultset generated by the command</returns>
        public static sqlDataReader ExecuteReaderTypedParams(String connectionString,the store procedure parameters must be initialized
            if ( daTarow != null && daTarow.ItemArray.Length > 0 )
            {
                // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
                sqlParameter[] commandParameters = sqlHelperParameterCache.GetSpParameterSet(connectionString,daTarow);
                
                return sqlHelper.ExecuteReader(connectionString,commandParameters);
            }
            else
            {
                return sqlHelper.ExecuteReader(connectionString,spName);
            }
        }


                
        /// <summary>
        /// Execute a stored procedure via a sqlCommand (that returns a resultset) against the specified sqlConnection 
        /// using the daTarow column values as the stored procedure's parameters values.
        /// This method will query the database to discover the parameters for the 
        /// stored procedure (the first time each stored procedure is called),and assign the values based on parameter order.
        /// </summary>
        /// <param name="connection">A valid sqlConnection object</param>
        /// <param name="spName">The name of the stored procedure</param>
        /// <param name="daTarow">The daTarow used to hold the stored procedure's parameter values.</param>
        /// <returns>A sqlDataReader containing the resultset generated by the command</returns>
        public static sqlDataReader ExecuteReaderTypedParams(sqlConnection connection,daTarow);
                
                return sqlHelper.ExecuteReader(connection,commandParameters);
            }
            else
            {
                return sqlHelper.ExecuteReader(connection,spName);
            }
        }
        
        /// <summary>
        /// Execute a stored procedure via a sqlCommand (that returns a resultset) against the specified sqlTransaction 
        /// using the daTarow column values as the stored procedure's parameters values.
        /// This method will query the database to discover the parameters for the 
        /// stored procedure (the first time each stored procedure is called),and assign the values based on parameter order.
        /// </summary>
        /// <param name="transaction">A valid sqlTransaction object</param>
        /// <param name="spName">The name of the stored procedure</param>
        /// <param name="daTarow">The daTarow used to hold the stored procedure's parameter values.</param>
        /// <returns>A sqlDataReader containing the resultset generated by the command</returns>
        public static sqlDataReader ExecuteReaderTypedParams(sqlTransaction transaction,the store procedure parameters must be initialized
            if( daTarow != null && daTarow.ItemArray.Length > 0 )
            {
                // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
                sqlParameter[] commandParameters = sqlHelperParameterCache.GetSpParameterSet(transaction.Connection,daTarow);
                
                return sqlHelper.ExecuteReader(transaction,commandParameters);
            }
            else
            {
                return sqlHelper.ExecuteReader(transaction,spName);
            }
        }
        #endregion


        #region ExecuteScalarTypedParams
        /// <summary>
        /// Execute a stored procedure via a sqlCommand (that returns a 1x1 resultset) against the database specified in 
        /// the connection string using the daTarow column values as the stored procedure's parameters values.
        /// This method will query the database to discover the parameters for the 
        /// stored procedure (the first time each stored procedure is called),and assign the values based on parameter order.
        /// </summary>
        /// <param name="connectionString">A valid connection string for a sqlConnection</param>
        /// <param name="spName">The name of the stored procedure</param>
        /// <param name="daTarow">The daTarow used to hold the stored procedure's parameter values.</param>
        /// <returns>An object containing the value in the 1x1 resultset generated by the command</returns>
        public static object ExecuteScalarTypedParams(String connectionString,the store procedure parameters must be initialized
            if( daTarow != null && daTarow.ItemArray.Length > 0)
            {
                // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
                sqlParameter[] commandParameters = sqlHelperParameterCache.GetSpParameterSet(connectionString,daTarow);
                
                return sqlHelper.ExecuteScalar(connectionString,commandParameters);
            }
            else
            {
                return sqlHelper.ExecuteScalar(connectionString,spName);
            }
        }


        /// <summary>
        /// Execute a stored procedure via a sqlCommand (that returns a 1x1 resultset) against the specified sqlConnection 
        /// using the daTarow column values as the stored procedure's parameters values.
        /// This method will query the database to discover the parameters for the 
        /// stored procedure (the first time each stored procedure is called),and assign the values based on parameter order.
        /// </summary>
        /// <param name="connection">A valid sqlConnection object</param>
        /// <param name="spName">The name of the stored procedure</param>
        /// <param name="daTarow">The daTarow used to hold the stored procedure's parameter values.</param>
        /// <returns>An object containing the value in the 1x1 resultset generated by the command</returns>
        public static object ExecuteScalarTypedParams(sqlConnection connection,daTarow);
                
                return sqlHelper.ExecuteScalar(connection,commandParameters);
            }
            else
            {
                return sqlHelper.ExecuteScalar(connection,spName);
            }
        }


        /// <summary>
        /// Execute a stored procedure via a sqlCommand (that returns a 1x1 resultset) against the specified sqlTransaction
        /// using the daTarow column values as the stored procedure's parameters values.
        /// This method will query the database to discover the parameters for the 
        /// stored procedure (the first time each stored procedure is called),and assign the values based on parameter order.
        /// </summary>
        /// <param name="transaction">A valid sqlTransaction object</param>
        /// <param name="spName">The name of the stored procedure</param>
        /// <param name="daTarow">The daTarow used to hold the stored procedure's parameter values.</param>
        /// <returns>An object containing the value in the 1x1 resultset generated by the command</returns>
        public static object ExecuteScalarTypedParams(sqlTransaction transaction,daTarow);
                
                return sqlHelper.ExecuteScalar(transaction,commandParameters);
            }
            else
            {
                return sqlHelper.ExecuteScalar(transaction,spName);
            }
        }
        #endregion


        #region ExecuteXmlReaderTypedParams
        /// <summary>
        /// Execute a stored procedure via a sqlCommand (that returns a resultset) against the specified sqlConnection 
        /// using the daTarow column values as the stored procedure's parameters values.
        /// This method will query the database to discover the parameters for the 
        /// stored procedure (the first time each stored procedure is called),and assign the values based on parameter order.
        /// </summary>
        /// <param name="connection">A valid sqlConnection object</param>
        /// <param name="spName">The name of the stored procedure</param>
        /// <param name="daTarow">The daTarow used to hold the stored procedure's parameter values.</param>
        /// <returns>An XmlReader containing the resultset generated by the command</returns>
        public static XmlReader ExecuteXmlReaderTypedParams(sqlConnection connection,daTarow);
                
                return sqlHelper.ExecuteXmlReader(connection,commandParameters);
            }
            else
            {
                return sqlHelper.ExecuteXmlReader(connection,and assign the values based on parameter order.
        /// </summary>
        /// <param name="transaction">A valid sqlTransaction object</param>
        /// <param name="spName">The name of the stored procedure</param>
        /// <param name="daTarow">The daTarow used to hold the stored procedure's parameter values.</param>
        /// <returns>An XmlReader containing the resultset generated by the command</returns>
        public static XmlReader ExecuteXmlReaderTypedParams(sqlTransaction transaction,daTarow);
                
                return sqlHelper.ExecuteXmlReader(transaction,commandParameters);
            }
            else
            {
                return sqlHelper.ExecuteXmlReader(transaction,spName);
            }
        }
        #endregion


    }


    /// <summary>
    /// sqlHelperParameterCache provides functions to Leverage a static cache of procedure parameters,and the
    /// ability to discover parameters for stored procedures at run-time.
    /// </summary>
    public sealed class sqlHelperParameterCache
    {
        #region private methods,variables,and constructors


        //Since this class provides only static methods,make the default constructor private to prevent 
        //instances from being created with "new sqlHelperParameterCache()"
        private sqlHelperParameterCache() {}


        private static Hashtable paramCache = Hashtable.Synchronized(new Hashtable());


        /// <summary>
        /// Resolve at run time the appropriate set of sqlParameters for a stored procedure
        /// </summary>
        /// <param name="connection">A valid sqlConnection object</param>
        /// <param name="spName">The name of the stored procedure</param>
        /// <param name="includeReturnValueParameter">Whether or not to include their return value parameter</param>
        /// <returns>The parameter array discovered.</returns>
        private static sqlParameter[] discoverSpParameterSet(sqlConnection connection,bool includeReturnValueParameter)
        {
            if( connection == null ) throw new ArgumentNullException( "connection" );
            if( spName == null || spName.Length == 0 ) throw new ArgumentNullException( "spName" );


            sqlCommand cmd = new sqlCommand(spName,connection);
            cmd.CommandType = CommandType.StoredProcedure;


            connection.open();
            sqlCommandBuilder.DeriveParameters(cmd);
            connection.Close();


            if (!includeReturnValueParameter) 
            {
                cmd.Parameters.RemoveAt(0);
            }
                
            sqlParameter[] discoveredParameters = new sqlParameter[cmd.Parameters.Count];


            cmd.Parameters.copyTo(discoveredParameters,0);


            // Init the parameters with a dbnull value
            foreach (sqlParameter discoveredParameter in discoveredParameters)
            {
                discoveredParameter.Value = dbnull.Value;
            }
            return discoveredParameters;
        }


        /// <summary>
        /// Deep copy of cached sqlParameter array
        /// </summary>
        /// <param name="originalParameters"></param>
        /// <returns></returns>
        private static sqlParameter[] CloneParameters(sqlParameter[] originalParameters)
        {
            sqlParameter[] clonedParameters = new sqlParameter[originalParameters.Length];


            for (int i = 0,j = originalParameters.Length; i < j; i++)
            {
                clonedParameters[i] = (sqlParameter)((ICloneable)originalParameters[i]).Clone();
            }


            return clonedParameters;
        }


        #endregion private methods,and constructors


        #region caching functions


        /// <summary>
        /// Add parameter array to the cache
        /// </summary>
        /// <param name="connectionString">A valid connection string for a sqlConnection</param>
        /// <param name="commandText">The stored procedure name or T-sql command</param>
        /// <param name="commandParameters">An array of sqlParamters to be cached</param>
        public static void CacheParameterSet(string connectionString,params sqlParameter[] commandParameters)
        {
            if( connectionString == null || connectionString.Length == 0 ) throw new ArgumentNullException( "connectionString" );
            if( commandText == null || commandText.Length == 0 ) throw new ArgumentNullException( "commandText" );


            string hashKey = connectionString + ":" + commandText;


            paramCache[hashKey] = commandParameters;
        }


        /// <summary>
        /// Retrieve a parameter array from the cache
        /// </summary>
        /// <param name="connectionString">A valid connection string for a sqlConnection</param>
        /// <param name="commandText">The stored procedure name or T-sql command</param>
        /// <returns>An array of sqlParamters</returns>
        public static sqlParameter[] GetCachedParameterSet(string connectionString,string commandText)
        {
            if( connectionString == null || connectionString.Length == 0 ) throw new ArgumentNullException( "connectionString" );
            if( commandText == null || commandText.Length == 0 ) throw new ArgumentNullException( "commandText" );


            string hashKey = connectionString + ":" + commandText;


            sqlParameter[] cachedParameters = paramCache[hashKey] as sqlParameter[];
            if (cachedParameters == null)
            {            
                return null;
            }
            else
            {
                return CloneParameters(cachedParameters);
            }
        }


        #endregion caching functions


        #region Parameter discovery Functions


        /// <summary>
        /// Retrieves the set of sqlParameters appropriate for the stored procedure
        /// </summary>
        /// <remarks>
        /// This method will query the database for this @R_435_4045@ion,and then store it in a cache for future requests.
        /// </remarks>
        /// <param name="connectionString">A valid connection string for a sqlConnection</param>
        /// <param name="spName">The name of the stored procedure</param>
        /// <returns>An array of sqlParameters</returns>
        public static sqlParameter[] GetSpParameterSet(string connectionString,string spName)
        {
            return GetSpParameterSet(connectionString,false);
        }


        /// <summary>
        /// Retrieves the set of sqlParameters appropriate for the stored procedure
        /// </summary>
        /// <remarks>
        /// This method will query the database for this @R_435_4045@ion,and then store it in a cache for future requests.
        /// </remarks>
        /// <param name="connectionString">A valid connection string for a sqlConnection</param>
        /// <param name="spName">The name of the stored procedure</param>
        /// <param name="includeReturnValueParameter">A bool value indicating whether the return value parameter should be included in the results</param>
        /// <returns>An array of sqlParameters</returns>
        public static sqlParameter[] GetSpParameterSet(string connectionString,bool includeReturnValueParameter)
        {
            if( connectionString == null || connectionString.Length == 0 ) throw new ArgumentNullException( "connectionString" );
            if( spName == null || spName.Length == 0 ) throw new ArgumentNullException( "spName" );


            using(sqlConnection connection = new sqlConnection(connectionString))
            {
                return GetSpParameterSetInternal(connection,includeReturnValueParameter);
            }
        }


        /// <summary>
        /// Retrieves the set of sqlParameters appropriate for the stored procedure
        /// </summary>
        /// <remarks>
        /// This method will query the database for this @R_435_4045@ion,and then store it in a cache for future requests.
        /// </remarks>
        /// <param name="connection">A valid sqlConnection object</param>
        /// <param name="spName">The name of the stored procedure</param>
        /// <returns>An array of sqlParameters</returns>
        internal static sqlParameter[] GetSpParameterSet(sqlConnection connection,string spName)
        {
            return GetSpParameterSet(connection,and then store it in a cache for future requests.
        /// </remarks>
        /// <param name="connection">A valid sqlConnection object</param>
        /// <param name="spName">The name of the stored procedure</param>
        /// <param name="includeReturnValueParameter">A bool value indicating whether the return value parameter should be included in the results</param>
        /// <returns>An array of sqlParameters</returns>
        internal static sqlParameter[] GetSpParameterSet(sqlConnection connection,bool includeReturnValueParameter)
        {
            if( connection == null ) throw new ArgumentNullException( "connection" );
            using (sqlConnection clonedConnection = (sqlConnection)((ICloneable)connection).Clone())
            {
                return GetSpParameterSetInternal(clonedConnection,includeReturnValueParameter);
            }
        }


        /// <summary>
        /// Retrieves the set of sqlParameters appropriate for the stored procedure
        /// </summary>
        /// <param name="connection">A valid sqlConnection object</param>
        /// <param name="spName">The name of the stored procedure</param>
        /// <param name="includeReturnValueParameter">A bool value indicating whether the return value parameter should be included in the results</param>
        /// <returns>An array of sqlParameters</returns>
        private static sqlParameter[] GetSpParameterSetInternal(sqlConnection connection,bool includeReturnValueParameter)
        {
            if( connection == null ) throw new ArgumentNullException( "connection" );
            if( spName == null || spName.Length == 0 ) throw new ArgumentNullException( "spName" );


            string hashKey = connection.ConnectionString + ":" + spName + (includeReturnValueParameter ? ":include ReturnValue Parameter":"");


            sqlParameter[] cachedParameters;
            
            cachedParameters = paramCache[hashKey] as sqlParameter[];
            if (cachedParameters == null)
            {    
                sqlParameter[] spParameters = discoverSpParameterSet(connection,includeReturnValueParameter);
                paramCache[hashKey] = spParameters;
                cachedParameters = spParameters;
            }
            
            return CloneParameters(cachedParameters);
        }
        
        #endregion Parameter discovery Functions


    }
}