SqlServer数据类型、C#SqlDbType对应关系及转换

 

// sqlDbType转换为C#数据类型
 public static Type sqlType2CsharpType(sqlDbType sqlType)
 {
 switch (sqlType)
 {
        case sqlDbType.BigInt:
          return typeof(Int64);
        case sqlDbType.Binary:
          return typeof(Object);
        case sqlDbType.Bit:
          return typeof(Boolean);
        case sqlDbType.Char:
          return typeof(String);
        case sqlDbType.DateTime:
          return typeof(DateTime);
        case sqlDbType.Decimal:
          return typeof(Decimal);
        case sqlDbType.Float:
          return typeof(Double);
        case sqlDbType.Image:
          return typeof(Object);
        case sqlDbType.Int:
          return typeof(Int32);
        case sqlDbType.Money:
          return typeof(Decimal);
        case sqlDbType.NChar:
          return typeof(String);
        case sqlDbType.NText:
          return typeof(String);
        case sqlDbType.NVarChar:
          return typeof(String);
        case sqlDbType.Real:
          return typeof(Single);
        case sqlDbType.SmallDateTime:
          return typeof(DateTime);
        case sqlDbType.SmallInt:
          return typeof(Int16);
        case sqlDbType.SmallMoney:
          return typeof(Decimal);
        case sqlDbType.Text:
          return typeof(String);
        case sqlDbType.Timestamp:
          return typeof(Object);
        case sqlDbType.tinyint:
          return typeof(Byte);
        case sqlDbType.Udt://自定义的数据类型
          return typeof(Object);
        case sqlDbType.UniqueIdentifier:
          return typeof(Object);
        case sqlDbType.VarBinary:
          return typeof(Object);
        case sqlDbType.VarChar:
          return typeof(String);
        case sqlDbType.Variant:
          return typeof(Object);
        case sqlDbType.Xml:
          return typeof(Object);
        default:
          return null;
 }
 }

 

 

// sql server数据类型（如：varchar）
 // 转换为sqlDbType类型
 public static sqlDbType sqlTypestring2sqlType(string sqlTypestring)
 {
 sqlDbType dbType = sqlDbType.Variant;//默认为Object
 
 switch (sqlTypestring)
 {
        case "int":
          dbType = sqlDbType.Int;
          break;
        case "varchar":
          dbType = sqlDbType.VarChar;
          break;
        case "bit":
          dbType = sqlDbType.Bit;
          break;
        case "datetime":
          dbType = sqlDbType.DateTime;
          break;
        case "decimal":
          dbType = sqlDbType.Decimal;
          break;
        case "float":
          dbType = sqlDbType.Float;
          break;
        case "image":
          dbType = sqlDbType.Image;
          break;
        case "money":
          dbType = sqlDbType.Money;
          break;
        case "ntext":
          dbType = sqlDbType.NText;
          break;
        case "nvarchar":
          dbType = sqlDbType.NVarChar;
          break;
        case "smalldatetime":
          dbType = sqlDbType.SmallDateTime;
          break;
        case "smallint":
          dbType = sqlDbType.SmallInt;
          break;
        case "text":
          dbType = sqlDbType.Text;
          break;
        case "bigint":
          dbType = sqlDbType.BigInt;
          break;
        case "binary":
          dbType = sqlDbType.Binary;
          break;
        case "char":
          dbType = sqlDbType.Char;
          break;
        case "nchar":
          dbType = sqlDbType.NChar;
          break;
        case "numeric":
          dbType = sqlDbType.Decimal;
          break;
        case "real":
          dbType = sqlDbType.Real;
          break;
        case "smallmoney":
          dbType = sqlDbType.SmallMoney;
          break;
        case "sql_variant":
          dbType = sqlDbType.Variant;
          break;
        case "timestamp":
          dbType = sqlDbType.Timestamp;
          break;
        case "tinyint":
          dbType = sqlDbType.tinyint;
          break;
        case "uniqueidentifier":
          dbType = sqlDbType.UniqueIdentifier;
          break;
        case "varbinary":
          dbType = sqlDbType.VarBinary;
          break;
        case "xml":
          dbType = sqlDbType.Xml;
          break;
 }
 return dbType;
 }

 

 

// sql server中的数据类型，转换为C#中的类型类型  public static Type sqlTypestring2CsharpType(string sqlTypestring)  {  sqlDbType dbTpe = sqlTypestring2sqlType(sqlTypestring);    return sqlType2CsharpType(dbTpe);  }    // 将sql server中的数据类型，转化为C#中的类型的字符串  public static string sqlTypestring2CsharpTypestring(string sqlTypestring)  {  Type type = sqlTypestring2CsharpType(sqlTypestring);    return type.Name;  }