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

loadTOCNode(2, 'moreinformation');

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

loadTOCNode(2, 'moreinformation');
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