SQL Server与ADO.Net数据类型对照
下表显示了 .NET Framework 类型、DbType 和 SqlDbType 枚举以及 SqlDataReader 的访问器方法。
SQL Server 数据库引擎类型 | .NET Framework 类型 | SqlDbType 枚举 | SqlDataReader SqlTypes 类型化访问器 | DbType 枚举 | SqlDataReader DbType 类型化访问器 |
---|---|---|---|---|---|
bigint | Int64 | BigInt | GetSqlInt64 | Int64 | GetInt64 |
binary | Byte[] | VarBinary | GetSqlBinary | Binary | GetBytes |
bit | Boolean | Bit | GetSqlBoolean | Boolean | GetBoolean |
char | String | Char | GetSqlString | AnsiStringFixedLength, | GetString |
Char[] | String | GetChars | |||
date (仅适用 SQL Server 2008) |
DateTime | Date | GetSqlDateTime | Date | GetDateTime |
datetime | DateTime | DateTime | GetSqlDateTime | DateTime | GetDateTime |
datetime2 (仅适用 SQL Server 2008) |
DateTime2 | DateTime2 | GetSqlDateTime | DateTime2 | GetDateTime |
datetimeoffset (仅适用 SQL Server 2008) |
DateTimeOffset | DateTimeOffset | 无 | DateTimeOffset | GetDateTimeOffset |
decimal | Decimal | Decimal | GetSqlDecimal | Decimal | GetDecimal |
FILESTREAM 属性 (varbinary(max) | Byte[] | VarBinary | GetSqlBytes | Binary | GetBytes |
float | Double | Float | GetSqlDouble | Double | GetDouble |
image | Byte[] | Binary | GetSqlBinary | Binary | GetBytes |
int | Int32 | Int | GetSqlInt32 | Int32 | GetInt32 |
money | Decimal | Money | GetSqlMoney | Decimal | GetDecimal |
nchar | String | NChar | GetSqlString | StringFixedLength | GetString |
Char[] | GetChars | ||||
ntext | String | NText | GetSqlString | String | GetString |
Char[] | GetChars | ||||
numeric | Decimal | Decimal | GetSqlDecimal | Decimal | GetDecimal |
nvarchar | String | NVarChar | GetSqlString | String | GetString |
Char[] | GetChars | ||||
real | Single | Real | GetSqlSingle | Single | GetFloat |
rowversion | Byte[] | Timestamp | GetSqlBinary | Binary | GetBytes |
smalldatetime | DateTime | DateTime | GetSqlDateTime | DateTime | GetDateTime |
smallint | Int16 | SmallInt | GetSqlInt16 | Int16 | GetInt16 |
smallmoney | Decimal | SmallMoney | GetSqlDecimal | Decimal | GetDecimal |
sql_variant | Object* | Variant | GetSqlValue * | Object | GetValue * |
text | String | Text | GetSqlString | String | GetString |
Char[] | GetChars | ||||
time (仅适用 SQL Server 2008) |
TimeSpan | Time | 无 | Time | GetDateTime |
timestamp | Byte[] | Timestamp | GetSqlBinary | Binary | GetBytes |
tinyint | Byte | TinyInt | GetSqlByte | Byte | GetByte |
uniqueidentifier | Guid | UniqueIdentifier | GetSqlGuid | Guid | GetGuid |
varbinary | Byte[] | VarBinary | GetSqlBinary | Binary | GetBytes |
varchar | String | VarChar | GetSqlString | AnsiString, String | GetString |
Char[] | GetChars | ||||
xml | Xml | Xml | GetSqlXml | Xml | 无 |