一份访问SqlServer数据库的Helper类

一份访问sqlServer数据库的Helper类，增删改查都适用：

using System;
using System.Collections;
using System.Collections.Specialized;
using System.Data;
using System.Data.sqlClient;
using System.Configuration;
using System.Data.Common;
using System.Collections.Generic;
namespace Maticsoft.DBUtility
{
    /// <summary>
    /// 数据访问抽象基础类
    /// copyright (C) 2004-2008 By LiTianPing 
    /// </summary>
    public abstract class DbHelpersql
    {
        //数据库连接字符串(web.config来配置)，可以动态更改connectionString支持多数据库.		
        public static string connectionString = ConfigurationManager.AppSettings["sqlConnString"];
    		
        public DbHelpersql()
        {            
        }

        #region 公用方法
        /// <summary>
        /// 判断是否存在某表的某个字段
        /// </summary>
        /// <param name="tableName">表名称</param>
        /// <param name="columnName">列名称</param>
        /// <returns>是否存在</returns>
        public static bool ColumnExists(string tableName,string columnName)
        {
            string sql = "select count(1) from syscolumns where [id]=object_id('" + tableName + "') and [name]='" + columnName + "'";
            object res = GetSingle(sql);
            if (res == null)
            {
                return false;
            }
            return Convert.ToInt32(res) > 0;
        }
        public static int GetMaxID(string FieldName,string TableName)
        {
            string strsql = "select max(" + FieldName + ")+1 from " + TableName;
            object obj = GetSingle(strsql);
            if (obj == null)
            {
                return 1;
            }
            else
            {
                return int.Parse(obj.ToString());
            }
        }
        public static bool Exists(string strsql)
        {
            object obj = GetSingle(strsql);
            int cmdresult;
            if ((Object.Equals(obj,null)) || (Object.Equals(obj,System.dbnull.Value)))
            {
                cmdresult = 0;
            }
            else
            {
                cmdresult = int.Parse(obj.ToString());
            }
            if (cmdresult == 0)
            {
                return false;
            }
            else
            {
                return true;
            }
        }
        /// <summary>
        /// 表是否存在
        /// </summary>
        /// <param name="TableName"></param>
        /// <returns></returns>
        public static bool TabExists(string TableName)
        {
            string strsql = "select count(*) from sysobjects where id = object_id(N'[" + TableName + "]') and OBJECTPROPERTY(id,N'IsUserTable') = 1";
            //string strsql = "SELECT count(*) FROM sys.objects WHERE object_id = OBJECT_ID(N'[dbo].[" + TableName + "]') AND type in (N'U')";
            object obj = GetSingle(strsql);
            int cmdresult;
            if ((Object.Equals(obj,System.dbnull.Value)))
            {
                cmdresult = 0;
            }
            else
            {
                cmdresult = int.Parse(obj.ToString());
            }
            if (cmdresult == 0)
            {
                return false;
            }
            else
            {
                return true;
            }
        }
        public static bool Exists(string strsql,params sqlParameter[] cmdParms)
        {
            object obj = GetSingle(strsql,cmdParms);
            int cmdresult;
            if ((Object.Equals(obj,System.dbnull.Value)))
            {
                cmdresult = 0;
            }
            else
            {
                cmdresult = int.Parse(obj.ToString());
            }
            if (cmdresult == 0)
            {
                return false;
            }
            else
            {
                return true;
            }
        }
        #endregion

        #region  执行简单sql语句

        /// <summary>
        /// 执行sql语句，返回影响的记录数
        /// </summary>
        /// <param name="sqlString">sql语句</param>
        /// <returns>影响的记录数</returns>
        public static int Executesql(string sqlString)
        {
            using (sqlConnection connection = new sqlConnection(connectionString))
            {
                using (sqlCommand cmd = new sqlCommand(sqlString,connection))
                {
                    try
                    {
                        connection.open();
                        int rows = cmd.ExecuteNonQuery();
                        return rows;
                    }
                    catch (System.Data.sqlClient.sqlException e)
                    {
                        connection.Close();
                        throw e;
                    }
                }
            }
        }

        public static int ExecutesqlByTime(string sqlString,int Times)
        {
            using (sqlConnection connection = new sqlConnection(connectionString))
            {
                using (sqlCommand cmd = new sqlCommand(sqlString,connection))
                {
                    try
                    {
                        connection.open();
                        cmd.CommandTimeout = Times;
                        int rows = cmd.ExecuteNonQuery();
                        return rows;
                    }
                    catch (System.Data.sqlClient.sqlException e)
                    {
                        connection.Close();
                        throw e;
                    }
                }
            }
        }
      

        /// <summary>
        /// 执行多条sql语句，实现数据库事务。
        /// </summary>
        /// <param name="sqlStringList">多条sql语句</param>		
        public static int ExecutesqlTran(List<String> sqlStringList)
        {
            using (sqlConnection conn = new sqlConnection(connectionString))
            {
                conn.open();
                sqlCommand cmd = new sqlCommand();
                cmd.Connection = conn;
                sqlTransaction tx = conn.BeginTransaction();
                cmd.Transaction = tx;
                try
                {
                    int count = 0;
                    for (int n = 0; n < sqlStringList.Count; n++)
                    {
                        string strsql = sqlStringList[n];
                        if (strsql.Trim().Length > 1)
                        {
                            cmd.CommandText = strsql;
                            count += cmd.ExecuteNonQuery();
                        }
                    }
                    tx.Commit();
                    return count;
                }
                catch
                {
                    tx.Rollback();
                    return 0;
                }
            }
        }
        /// <summary>
        /// 执行带一个存储过程参数的的sql语句。
        /// </summary>
        /// <param name="sqlString">sql语句</param>
        /// <param name="content">参数内容,比如一个字段是格式复杂的文章，有特殊符号，可以通过这个方式添加</param>
        /// <returns>影响的记录数</returns>
        public static int Executesql(string sqlString,string content)
        {
            using (sqlConnection connection = new sqlConnection(connectionString))
            {
                sqlCommand cmd = new sqlCommand(sqlString,connection);
                System.Data.sqlClient.sqlParameter myParameter = new System.Data.sqlClient.sqlParameter("@content",sqlDbType.NText);
                myParameter.Value = content;
                cmd.Parameters.Add(myParameter);
                try
                {
                    connection.open();
                    int rows = cmd.ExecuteNonQuery();
                    return rows;
                }
                catch (System.Data.sqlClient.sqlException e)
                {
                    throw e;
                }
                finally
                {
                    cmd.dispose();
                    connection.Close();
                }
            }
        }
        /// <summary>
        /// 执行带一个存储过程参数的的sql语句。
        /// </summary>
        /// <param name="sqlString">sql语句</param>
        /// <param name="content">参数内容,比如一个字段是格式复杂的文章，有特殊符号，可以通过这个方式添加</param>
        /// <returns>影响的记录数</returns>
        public static object ExecutesqlGet(string sqlString,sqlDbType.NText);
                myParameter.Value = content;
                cmd.Parameters.Add(myParameter);
                try
                {
                    connection.open();
                    object obj = cmd.ExecuteScalar();
                    if ((Object.Equals(obj,System.dbnull.Value)))
                    {
                        return null;
                    }
                    else
                    {
                        return obj;
                    }
                }
                catch (System.Data.sqlClient.sqlException e)
                {
                    throw e;
                }
                finally
                {
                    cmd.dispose();
                    connection.Close();
                }
            }
        }
        /// <summary>
        /// 向数据库里插入图像格式的字段(和上面情况类似的另一种实例)
        /// </summary>
        /// <param name="strsql">sql语句</param>
        /// <param name="fs">图像字节,数据库的字段类型为image的情况</param>
        /// <returns>影响的记录数</returns>
        public static int ExecutesqlInsertImg(string strsql,byte[] fs)
        {
            using (sqlConnection connection = new sqlConnection(connectionString))
            {
                sqlCommand cmd = new sqlCommand(strsql,connection);
                System.Data.sqlClient.sqlParameter myParameter = new System.Data.sqlClient.sqlParameter("@fs",sqlDbType.Image);
                myParameter.Value = fs;
                cmd.Parameters.Add(myParameter);
                try
                {
                    connection.open();
                    int rows = cmd.ExecuteNonQuery();
                    return rows;
                }
                catch (System.Data.sqlClient.sqlException e)
                {
                    throw e;
                }
                finally
                {
                    cmd.dispose();
                    connection.Close();
                }
            }
        }

        /// <summary>
        /// 执行一条计算查询结果语句，返回查询结果（object）。
        /// </summary>
        /// <param name="sqlString">计算查询结果语句</param>
        /// <returns>查询结果（object）</returns>
        public static object GetSingle(string sqlString)
        {
            using (sqlConnection connection = new sqlConnection(connectionString))
            {
                using (sqlCommand cmd = new sqlCommand(sqlString,connection))
                {
                    try
                    {
                        connection.open();
                        object obj = cmd.ExecuteScalar();
                        if ((Object.Equals(obj,System.dbnull.Value)))
                        {
                            return null;
                        }
                        else
                        {
                            return obj;
                        }
                    }
                    catch (System.Data.sqlClient.sqlException e)
                    {
                        connection.Close();
                        throw e;
                    }
                }
            }
        }
        public static object GetSingle(string sqlString,connection))
                {
                    try
                    {
                        connection.open();
                        cmd.CommandTimeout = Times;
                        object obj = cmd.ExecuteScalar();
                        if ((Object.Equals(obj,System.dbnull.Value)))
                        {
                            return null;
                        }
                        else
                        {
                            return obj;
                        }
                    }
                    catch (System.Data.sqlClient.sqlException e)
                    {
                        connection.Close();
                        throw e;
                    }
                }
            }
        }
        /// <summary>
        /// 执行查询语句，返回sqlDataReader ( 注意：调用该方法后，一定要对sqlDataReader进行Close )
        /// </summary>
        /// <param name="strsql">查询语句</param>
        /// <returns>sqlDataReader</returns>
        public static sqlDataReader ExecuteReader(string strsql)
        {
            sqlConnection connection = new sqlConnection(connectionString);
            sqlCommand cmd = new sqlCommand(strsql,connection);
            try
            {
                connection.open();
                sqlDataReader myReader = cmd.ExecuteReader(CommandBehavior.CloseConnection);
                return myReader;
            }
            catch (System.Data.sqlClient.sqlException e)
            {
                throw e;
            }   

        }
        /// <summary>
        /// 执行查询语句，返回DataSet
        /// </summary>
        /// <param name="sqlString">查询语句</param>
        /// <returns>DataSet</returns>
        public static DataSet Query(string sqlString)
        {
            using (sqlConnection connection = new sqlConnection(connectionString))
            {
                DataSet ds = new DataSet();
                try
                {
                    connection.open();
                    sqlDataAdapter command = new sqlDataAdapter(sqlString,connection);
                    command.Fill(ds,"ds");
                }
                catch (System.Data.sqlClient.sqlException ex)
                {
                    throw new Exception(ex.Message);
                }
                return ds;
            }
        }
        public static DataSet Query(string sqlString,int Times)
        {
            using (sqlConnection connection = new sqlConnection(connectionString))
            {
                DataSet ds = new DataSet();
                try
                {
                    connection.open();
                    sqlDataAdapter command = new sqlDataAdapter(sqlString,connection);
                    command.SelectCommand.CommandTimeout = Times;
                    command.Fill(ds,"ds");
                }
                catch (System.Data.sqlClient.sqlException ex)
                {
                    throw new Exception(ex.Message);
                }
                return ds;
            }
        }



        #endregion

        #region 执行带参数的sql语句

        /// <summary>
        /// 执行sql语句，返回影响的记录数
        /// </summary>
        /// <param name="sqlString">sql语句</param>
        /// <returns>影响的记录数</returns>
        public static int Executesql(string sqlString,params sqlParameter[] cmdParms)
        {
            using (sqlConnection connection = new sqlConnection(connectionString))
            {
                using (sqlCommand cmd = new sqlCommand())
                {
                    try
                    {
                        PrepareCommand(cmd,connection,null,sqlString,cmdParms);
                        int rows = cmd.ExecuteNonQuery();
                        cmd.Parameters.Clear();
                        return rows;
                    }
                    catch (System.Data.sqlClient.sqlException e)
                    {
                        throw e;
                    }
                }
            }
        }


        /// <summary>
        /// 执行多条sql语句，实现数据库事务。
        /// </summary>
        /// <param name="sqlStringList">sql语句的哈希表（key为sql语句，value是该语句的sqlParameter[]）</param>
        public static void ExecutesqlTran(Hashtable sqlStringList)
        {
            using (sqlConnection conn = new sqlConnection(connectionString))
            {
                conn.open();
                using (sqlTransaction trans = conn.BeginTransaction())
                {
                    sqlCommand cmd = new sqlCommand();
                    try
                    {
                        //循环
                        foreach (DictionaryEntry myDE in sqlStringList)
                        {
                            string cmdText = myDE.Key.ToString();
                            sqlParameter[] cmdParms = (sqlParameter[])myDE.Value;
                            PrepareCommand(cmd,conn,trans,cmdText,cmdParms);
                            int val = cmd.ExecuteNonQuery();
                            cmd.Parameters.Clear();
                        }
                        trans.Commit();
                    }
                    catch
                    {
                        trans.Rollback();
                        throw;
                    }
                }
            }
        }

        /// <summary>
        /// 执行一条计算查询结果语句，返回查询结果（object）。
        /// </summary>
        /// <param name="sqlString">计算查询结果语句</param>
        /// <returns>查询结果（object）</returns>
        public static object GetSingle(string sqlString,cmdParms);
                        object obj = cmd.ExecuteScalar();
                        cmd.Parameters.Clear();
                        if ((Object.Equals(obj,System.dbnull.Value)))
                        {
                            return null;
                        }
                        else
                        {
                            return obj;
                        }
                    }
                    catch (System.Data.sqlClient.sqlException e)
                    {
                        throw e;
                    }
                }
            }
        }

        /// <summary>
        /// 执行查询语句，返回sqlDataReader ( 注意：调用该方法后，一定要对sqlDataReader进行Close )
        /// </summary>
        /// <param name="strsql">查询语句</param>
        /// <returns>sqlDataReader</returns>
        public static sqlDataReader ExecuteReader(string sqlString,params sqlParameter[] cmdParms)
        {
            sqlConnection connection = new sqlConnection(connectionString);
            sqlCommand cmd = new sqlCommand();
            try
            {
                PrepareCommand(cmd,cmdParms);
                sqlDataReader myReader = cmd.ExecuteReader(CommandBehavior.CloseConnection);
                cmd.Parameters.Clear();
                return myReader;
            }
            catch (System.Data.sqlClient.sqlException e)
            {
                throw e;
            }
            //			finally
            //			{
            //				cmd.dispose();
            //				connection.Close();
            //			}	

        }

        /// <summary>
        /// 执行查询语句，返回DataSet
        /// </summary>
        /// <param name="sqlString">查询语句</param>
        /// <returns>DataSet</returns>
        public static DataSet Query(string sqlString,params sqlParameter[] cmdParms)
        {
            using (sqlConnection connection = new sqlConnection(connectionString))
            {
                sqlCommand cmd = new sqlCommand();
                PrepareCommand(cmd,cmdParms);
                using (sqlDataAdapter da = new sqlDataAdapter(cmd))
                {
                    DataSet ds = new DataSet();
                    try
                    {
                        da.Fill(ds,"ds");
                        cmd.Parameters.Clear();
                    }
                    catch (System.Data.sqlClient.sqlException ex)
                    {
                        throw new Exception(ex.Message);
                    }
                    return ds;
                }
            }
        }


        private static void PrepareCommand(sqlCommand cmd,sqlConnection conn,sqlTransaction trans,string cmdText,sqlParameter[] cmdParms)
        {
            if (conn.State != ConnectionState.Open)
                conn.open();
            cmd.Connection = conn;
            cmd.CommandText = cmdText;
            if (trans != null)
                cmd.Transaction = trans;
            cmd.CommandType = CommandType.Text;//cmdType;
            if (cmdParms != null)
            {


                foreach (sqlParameter parameter in cmdParms)
                {
                    if ((parameter.Direction == ParameterDirection.InputOutput || parameter.Direction == ParameterDirection.Input) &&
                        (parameter.Value == null))
                    {
                        parameter.Value = dbnull.Value;
                    }
                    cmd.Parameters.Add(parameter);
                }
            }
        }

        #endregion

        #region 存储过程操作

        /// <summary>
        /// 执行存储过程，返回sqlDataReader ( 注意：调用该方法后，一定要对sqlDataReader进行Close )
        /// </summary>
        /// <param name="storedProcName">存储过程名</param>
        /// <param name="parameters">存储过程参数</param>
        /// <returns>sqlDataReader</returns>
        public static sqlDataReader RunProcedure(string storedProcName,IDataParameter[] parameters)
        {
            sqlConnection connection = new sqlConnection(connectionString);
            sqlDataReader returnReader;
            connection.open();
            sqlCommand command = BuildQueryCommand(connection,storedProcName,parameters);
            command.CommandType = CommandType.StoredProcedure;
            returnReader = command.ExecuteReader(CommandBehavior.CloseConnection);
            return returnReader;
            
        }


        /// <summary>
        /// 执行存储过程
        /// </summary>
        /// <param name="storedProcName">存储过程名</param>
        /// <param name="parameters">存储过程参数</param>
        /// <param name="tableName">DataSet结果中的表名</param>
        /// <returns>DataSet</returns>
        public static DataSet RunProcedure(string storedProcName,IDataParameter[] parameters,string tableName)
        {
            using (sqlConnection connection = new sqlConnection(connectionString))
            {
                DataSet dataSet = new DataSet();
                connection.open();
                sqlDataAdapter sqlDA = new sqlDataAdapter();
                sqlDA.SelectCommand = BuildQueryCommand(connection,parameters);
                sqlDA.Fill(dataSet,tableName);
                connection.Close();
                return dataSet;
            }
        }
        public static DataSet RunProcedure(string storedProcName,string tableName,int Times)
        {
            using (sqlConnection connection = new sqlConnection(connectionString))
            {
                DataSet dataSet = new DataSet();
                connection.open();
                sqlDataAdapter sqlDA = new sqlDataAdapter();
                sqlDA.SelectCommand = BuildQueryCommand(connection,parameters);
                sqlDA.SelectCommand.CommandTimeout = Times;
                sqlDA.Fill(dataSet,tableName);
                connection.Close();
                return dataSet;
            }
        }


        /// <summary>
        /// 构建 sqlCommand 对象(用来返回一个结果集，而不是一个整数值)
        /// </summary>
        /// <param name="connection">数据库连接</param>
        /// <param name="storedProcName">存储过程名</param>
        /// <param name="parameters">存储过程参数</param>
        /// <returns>sqlCommand</returns>
        private static sqlCommand BuildQueryCommand(sqlConnection connection,string storedProcName,IDataParameter[] parameters)
        {
            sqlCommand command = new sqlCommand(storedProcName,connection);
            command.CommandType = CommandType.StoredProcedure;
            foreach (sqlParameter parameter in parameters)
            {
                if (parameter != null)
                {
                    // 检查未分配值的输出参数,将其分配以dbnull.Value.
                    if ((parameter.Direction == ParameterDirection.InputOutput || parameter.Direction == ParameterDirection.Input) &&
                        (parameter.Value == null))
                    {
                        parameter.Value = dbnull.Value;
                    }
                    command.Parameters.Add(parameter);
                }
            }

            return command;
        }

        /// <summary>
        /// 执行存储过程，返回影响的行数		
        /// </summary>
        /// <param name="storedProcName">存储过程名</param>
        /// <param name="parameters">存储过程参数</param>
        /// <param name="rowsAffected">影响的行数</param>
        /// <returns></returns>
        public static int RunProcedure(string storedProcName,out int rowsAffected)
        {
            using (sqlConnection connection = new sqlConnection(connectionString))
            {
                int result;
                connection.open();
                sqlCommand command = BuildIntCommand(connection,parameters);
                rowsAffected = command.ExecuteNonQuery();
                result = (int)command.Parameters["ReturnValue"].Value;
                //Connection.Close();
                return result;
            }
        }

        /// <summary>
        /// 创建 sqlCommand 对象实例(用来返回一个整数值)
        /// </summary>
        /// <param name="storedProcName">存储过程名</param>
        /// <param name="parameters">存储过程参数</param>
        /// <returns>sqlCommand 对象实例</returns>
        private static sqlCommand BuildIntCommand(sqlConnection connection,IDataParameter[] parameters)
        {
            sqlCommand command = BuildQueryCommand(connection,parameters);
            command.Parameters.Add(new sqlParameter("ReturnValue",sqlDbType.Int,4,ParameterDirection.ReturnValue,false,string.Empty,DaTarowVersion.Default,null));
            return command;
        }
        #endregion

    }

}