我坐下来编写一个庞大的switch()语句,将SQL数据类型转换为CLR数据类型,以便从MSSQL存储过程生成类.我正在使用此图表作为参考.在我进入可能需要一整天并且完全测试的巨大痛苦之前,我想呼吁SO社区,看看是否有其他人已经在C#中编写或发现了一些看似常见的东西确定无聊的任务.
Gre*_*ech 68
这是我们使用的那个.您可能想要调整它(例如可空/不可空类型等),但它应该可以节省大部分输入.
public static Type GetClrType(SqlDbType sqlType)
{
switch (sqlType)
{
case SqlDbType.BigInt:
return typeof(long?);
case SqlDbType.Binary:
case SqlDbType.Image:
case SqlDbType.Timestamp:
case SqlDbType.VarBinary:
return typeof(byte[]);
case SqlDbType.Bit:
return typeof(bool?);
case SqlDbType.Char:
case SqlDbType.NChar:
case SqlDbType.NText:
case SqlDbType.NVarChar:
case SqlDbType.Text:
case SqlDbType.VarChar:
case SqlDbType.Xml:
return typeof(string);
case SqlDbType.DateTime:
case SqlDbType.SmallDateTime:
case SqlDbType.Date:
case SqlDbType.Time:
case SqlDbType.DateTime2:
return typeof(DateTime?);
case SqlDbType.Decimal:
case SqlDbType.Money:
case SqlDbType.SmallMoney:
return typeof(decimal?);
case SqlDbType.Float:
return typeof(double?);
case SqlDbType.Int:
return typeof(int?);
case SqlDbType.Real:
return typeof(float?);
case SqlDbType.UniqueIdentifier:
return typeof(Guid?);
case SqlDbType.SmallInt:
return typeof(short?);
case SqlDbType.TinyInt:
return typeof(byte?);
case SqlDbType.Variant:
case SqlDbType.Udt:
return typeof(object);
case SqlDbType.Structured:
return typeof(DataTable);
case SqlDbType.DateTimeOffset:
return typeof(DateTimeOffset?);
default:
throw new ArgumentOutOfRangeException("sqlType");
}
}
/****** Object: Table [dbo].[DbVsCSharpTypes] Script Date: 03/20/2010 03:07:56 ******/
IF EXISTS (SELECT * FROM sys.objects WHERE object_id = OBJECT_ID(N'[dbo].[DbVsCSharpTypes]')
AND type in (N'U'))
DROP TABLE [dbo].[DbVsCSharpTypes]
GO
/****** Object: Table [dbo].[DbVsCSharpTypes] Script Date: 03/20/2010 03:07:56 ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
CREATE TABLE [dbo].[DbVsCSharpTypes](
[DbVsCSharpTypesId] [int] IDENTITY(1,1) NOT NULL,
[Sql2008DataType] [varchar](200) NULL,
[CSharpDataType] [varchar](200) NULL,
[CLRDataType] [varchar](200) NULL,
[CLRDataTypeSqlServer] [varchar](2000) NULL,
CONSTRAINT [PK_DbVsCSharpTypes] PRIMARY KEY CLUSTERED
(
[DbVsCSharpTypesId] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
) ON [PRIMARY]
GO
SET NOCOUNT ON;
SET XACT_ABORT ON;
GO
SET IDENTITY_INSERT [dbo].[DbVsCSharpTypes] ON;
BEGIN TRANSACTION;
INSERT INTO [dbo].[DbVsCSharpTypes]([DbVsCSharpTypesId], [Sql2008DataType], [CSharpDataType], [CLRDataType], [CLRDataTypeSqlServer])
SELECT 1, N'bigint', N'long', N'Int64, Nullable<Int64>', N'SqlInt64' UNION ALL
SELECT 2, N'binary', N'byte[]', N'Byte[]', N'SqlBytes, SqlBinary' UNION ALL
SELECT 3, N'bit', N'bool', N'Boolean, Nullable<Boolean>', N'SqlBoolean' UNION ALL
SELECT 4, N'char', N'char', NULL, NULL UNION ALL
SELECT 5, N'cursor', NULL, NULL, NULL UNION ALL
SELECT 6, N'date', N'DateTime', N'DateTime, Nullable<DateTime>', N'SqlDateTime' UNION ALL
SELECT 7, N'datetime', N'DateTime', N'DateTime, Nullable<DateTime>', N'SqlDateTime' UNION ALL
SELECT 8, N'datetime2', N'DateTime', N'DateTime, Nullable<DateTime>', N'SqlDateTime' UNION ALL
SELECT 9, N'DATETIMEOFFSET', N'DateTimeOffset', N'DateTimeOffset', N'DateTimeOffset, Nullable<DateTimeOffset>' UNION ALL
SELECT 10, N'decimal', N'decimal', N'Decimal, Nullable<Decimal>', N'SqlDecimal' UNION ALL
SELECT 11, N'float', N'double', N'Double, Nullable<Double>', N'SqlDouble' UNION ALL
SELECT 12, N'geography', NULL, NULL, N'SqlGeography is defined in Microsoft.SqlServer.Types.dll, which is installed with SQL Server and can be downloaded from the SQL Server 2008 feature pack.' UNION ALL
SELECT 13, N'geometry', NULL, NULL, N'SqlGeometry is defined in Microsoft.SqlServer.Types.dll, which is installed with SQL Server and can be downloaded from the SQL Server 2008 feature pack.' UNION ALL
SELECT 14, N'hierarchyid', NULL, NULL, N'SqlHierarchyId is defined in Microsoft.SqlServer.Types.dll, which is installed with SQL Server and can be downloaded from the SQL Server 2008 feature pack.' UNION ALL
SELECT 15, N'image', NULL, NULL, NULL UNION ALL
SELECT 16, N'int', N'int', N'Int32, Nullable<Int32>', N'SqlInt32' UNION ALL
SELECT 17, N'money', N'decimal', N'Decimal, Nullable<Decimal>', N'SqlMoney' UNION ALL
SELECT 18, N'nchar', N'string', N'String, Char[]', N'SqlChars, SqlString' UNION ALL
SELECT 19, N'ntext', NULL, NULL, NULL UNION ALL
SELECT 20, N'numeric', N'decimal', N'Decimal, Nullable<Decimal>', N'SqlDecimal' UNION ALL
SELECT 21, N'nvarchar', N'string', N'String, Char[]', N'SqlChars, SqlStrinG SQLChars is a better match for data transfer and access, and SQLString is a better match for performing String operations.' UNION ALL
SELECT 22, N'nvarchar(1), nchar(1)', N'string', N'Char, String, Char[], Nullable<char>', N'SqlChars, SqlString' UNION ALL
SELECT 23, N'real', N'single', N'Single, Nullable<Single>', N'SqlSingle' UNION ALL
SELECT 24, N'rowversion', N'byte[]', N'Byte[]', NULL UNION ALL
SELECT 25, N'smallint', N'smallint', N'Int16, Nullable<Int16>', N'SqlInt16' UNION ALL
SELECT 26, N'smallmoney', N'decimal', N'Decimal, Nullable<Decimal>', N'SqlMoney' UNION ALL
SELECT 27, N'sql_variant', N'object', N'Object', NULL UNION ALL
SELECT 28, N'table', NULL, NULL, NULL UNION ALL
SELECT 29, N'text', N'string', NULL, NULL UNION ALL
SELECT 30, N'time', N'TimeSpan', N'TimeSpan, Nullable<TimeSpan>', N'TimeSpan' UNION ALL
SELECT 31, N'timestamp', NULL, NULL, NULL UNION ALL
SELECT 32, N'tinyint', N'byte', N'Byte, Nullable<Byte>', N'SqlByte' UNION ALL
SELECT 33, N'uniqueidentifier', N'Guid', N'Guid, Nullable<Guid>', N'SqlGuidUser-defined type(UDT)The same class that is bound to the user-defined type in the same assembly or a dependent assembly.' UNION ALL
SELECT 34, N'varbinary ', N'byte[]', N'Byte[]', N'SqlBytes, SqlBinary' UNION ALL
SELECT 35, N'varbinary(1), binary(1)', N'byte', N'byte, Byte[], Nullable<byte>', N'SqlBytes, SqlBinary' UNION ALL
SELECT 36, N'varchar', NULL, NULL, NULL UNION ALL
SELECT 37, N'xml', NULL, NULL, N'SqlXml'
COMMIT;
RAISERROR (N'[dbo].[DbVsCSharpTypes]: Insert Batch: 1.....Done!', 10, 1) WITH NOWAIT;
GO
SET IDENTITY_INSERT [dbo].[DbVsCSharpTypes] OFF;
小智 5
internal Type type(SqlDbType sqltype)
{
Type resulttype = null;
Dictionary<SqlDbType, Type> Types = new Dictionary<SqlDbType, Type>();
Types.Add(SqlDbType.BigInt, typeof(Int64));
Types.Add(SqlDbType.Binary, typeof(Byte[]));
Types.Add(SqlDbType.Bit, typeof(Boolean));
Types.Add(SqlDbType.Char, typeof(String));
Types.Add(SqlDbType.Date, typeof(DateTime));
Types.Add(SqlDbType.DateTime, typeof(DateTime));
Types.Add(SqlDbType.DateTime2, typeof(DateTime));
Types.Add(SqlDbType.DateTimeOffset, typeof(DateTimeOffset));
Types.Add(SqlDbType.Decimal, typeof(Decimal));
Types.Add(SqlDbType.Float, typeof(Double));
Types.Add(SqlDbType.Image, typeof(Byte[]));
Types.Add(SqlDbType.Int, typeof(Int32));
Types.Add(SqlDbType.Money, typeof(Decimal));
Types.Add(SqlDbType.NChar, typeof(String));
Types.Add(SqlDbType.NText, typeof(String));
Types.Add(SqlDbType.NVarChar, typeof(String));
Types.Add(SqlDbType.Real, typeof(Single));
Types.Add(SqlDbType.SmallDateTime, typeof(DateTime));
Types.Add(SqlDbType.SmallInt, typeof(Int16));
Types.Add(SqlDbType.SmallMoney, typeof(Decimal));
Types.Add(SqlDbType.Text, typeof(String));
Types.Add(SqlDbType.Time, typeof(TimeSpan));
Types.Add(SqlDbType.Timestamp, typeof(Byte[]));
Types.Add(SqlDbType.TinyInt, typeof(Byte));
Types.Add(SqlDbType.UniqueIdentifier, typeof(Guid));
Types.Add(SqlDbType.VarBinary, typeof(Byte[]));
Types.Add(SqlDbType.VarChar, typeof(String));
Types.TryGetValue(sqltype, out resulttype);
return resulttype;
}
internal SqlDbType type(Type systype)
{
SqlDbType resulttype = SqlDbType.NVarChar;
Dictionary<Type, SqlDbType> Types = new Dictionary<Type, SqlDbType>();
Types.Add(typeof(Boolean), SqlDbType.Bit);
Types.Add(typeof(String), SqlDbType.NVarChar);
Types.Add(typeof(DateTime), SqlDbType.DateTime);
Types.Add(typeof(Int16), SqlDbType.Int);
Types.Add(typeof(Int32), SqlDbType.Int);
Types.Add(typeof(Int64), SqlDbType.Int);
Types.Add(typeof(Decimal), SqlDbType.Float);
Types.Add(typeof(Double), SqlDbType.Float);
Types.TryGetValue(systype, out resulttype);
return resulttype;
}
小智 5
这是一个接受可为空的修订版。
public static Type GetClrType(SqlDbType sqlType, bool isNullable)
{
switch (sqlType)
{
case SqlDbType.BigInt:
return isNullable ? typeof(long?) : typeof(long);
case SqlDbType.Binary:
case SqlDbType.Image:
case SqlDbType.Timestamp:
case SqlDbType.VarBinary:
return typeof(byte[]);
case SqlDbType.Bit:
return isNullable ? typeof(bool?) : typeof(bool);
case SqlDbType.Char:
case SqlDbType.NChar:
case SqlDbType.NText:
case SqlDbType.NVarChar:
case SqlDbType.Text:
case SqlDbType.VarChar:
case SqlDbType.Xml:
return typeof(string);
case SqlDbType.DateTime:
case SqlDbType.SmallDateTime:
case SqlDbType.Date:
case SqlDbType.Time:
case SqlDbType.DateTime2:
return isNullable ? typeof(DateTime?) : typeof(DateTime);
case SqlDbType.Decimal:
case SqlDbType.Money:
case SqlDbType.SmallMoney:
return isNullable ? typeof(decimal?) : typeof(decimal);
case SqlDbType.Float:
return isNullable ? typeof(double?) : typeof(double);
case SqlDbType.Int:
return isNullable ? typeof(int?) : typeof(int);
case SqlDbType.Real:
return isNullable ? typeof(float?) : typeof(float);
case SqlDbType.UniqueIdentifier:
return isNullable ? typeof(Guid?) : typeof(Guid);
case SqlDbType.SmallInt:
return isNullable ? typeof(short?) : typeof(short);
case SqlDbType.TinyInt:
return isNullable ? typeof(byte?) : typeof(byte);
case SqlDbType.Variant:
case SqlDbType.Udt:
return typeof(object);
case SqlDbType.Structured:
return typeof(DataTable);
case SqlDbType.DateTimeOffset:
return isNullable ? typeof(DateTimeOffset?) : typeof(DateTimeOffset);
default:
throw new ArgumentOutOfRangeException("sqlType");
}
}
你不需要一个功能.我想你可能正在寻找
dt.Columns[i].DataType.UnderlyingSystemType
dt - dataTable
这将返回相应列的CLR类型.希望这会有所帮助,顺便说一下这是我关于堆栈溢出的第一个答案