Jet 4.0 ODBC DataType 映射

来自: http://support.microsoft.com/default.aspx?scid=kb%3Bzh-cn%3B214854

ODBC 与 Jet 数据类型映射

ODBC SQL Type     Precision  Scale Jet 3.5 Type Jet 40 Type

-----------------------------------------------------------

SQL_BIT           N/A        N/A   Boolean      Boolean

SQL_TINYINT       N/A        N/A   Byte*        Byte*

SQL_TINYINT       N/A        N/A   Integer*     Integer*

SQL_SMALLINT      N/A        N/A   Integer      Integer

SQL_INTEGER       N/A        N/A   Long         Long

SQL_REAL          N/A        N/A   Single       Single

SQL_FLOAT         N/A        N/A   Double       Double

SQL_DOUBLE        N/A        N/A   Double       Double

SQL_DECIMAL       0 To 4     0     Integer      Decimal

SQL_DECIMAL       5 To 9     0     Long         Decimal

SQL_DECIMAL       10 to 15   0     Double       Decimal

SQL_DECIMAL       <=15       >0    Double       Decimal

SQL_DECIMAL       16 To 28   N/A   Text         Decimal

SQL_DECIMAL       > 28       N/A   Text         Text

SQL_NUMERIC       0 To 4     0     Integer      Decimal

SQL_NUMERIC       5 To 9     0     Long         Decimal

SQL_NUMERIC       10 to 15   0     Double       Decimal

SQL_NUMERIC       <=15       >0    Double       Decimal

SQL_NUMERIC       16 To 28   N/A   Text         Decimal

SQL_NUMERIC       > 28       N/A   Text         Text

SQL_CHAR          <= 255     N/A   Text         Text

SQL_CHAR          > 255      N/A   Memo         Memo

SQL_VARCHAR       <= 255     N/A   Text         Text

SQL_VARCHAR       > 255      N/A   Memo         Memo

SQL_LONGVARCHAR   N/A        N/A   Memo         Memo

SQL_WCHAR         <= 255     N/A   Unsupported  Text

SQL_WCHAR         > 255      N/A   Unsupported  Memo

SQL_WVARCHAR      <= 255     N/A   Unsupported  Text

SQL_WVARCHAR      > 255      N/A   Unsupported  Memo

SQL_WLONGVARCHAR  N/A        N/A   Unsupported  Memo

SQL_DATE          N/A        N/A   DateTime     DateTime

SQL_TIME          N/A        N/A   DateTime     DateTime

SQL_TIMESTAMP     N/A        N/A   DateTime     DateTime

SQL_BINARY        <=255      N/A   Binary       Binary

SQL_BINARY        256 To 510 N/A   LongBinary   Binary

SQL_BINARY        > 510      N/A   LongBinary   LongBinary

SQL_VARBINARY     <=255      N/A   Binary       Binary

SQL_VARBINARY     256 To 510 N/A   LongBinary   Binary

SQL_VARBINARY     > 510      N/A   LongBinary   LongBinary

SQL_LONGVARBINARY N/A        N/A   LongBinary   LongBinary

SQL_GUID          N/A        N/A   Text         Guid

* An unsigned SQL_TINYINT maps to a Jet Byte, a signed SQL_TINYINT

maps to an Jet Integer.

 

特殊 ODBC 到 Jet - 数据类型映射为 SQLServer

MicrosoftJet 是与 Microsoft SQL Server ODBC 驱动程序, 如果发生下列其他数据类型映射：

ODBC SQL Type     Precision  Scale Jet 3.5 Type Jet 40 Type

-----------------------------------------------------------

SQL_DECIMAL       10         4     Currency     Currency

SQL_DECIMAL       19         4     Currency     Currency

SQL_NUMERIC       10         4     Currency     Currency

SQL_NUMERIC       19         4     Currency     Currency