ADO 数据类型

下面的表格列出了 Access、SQL Server 与 Oracle 之间的数据类型映射：

DataType Enum	值	Access	SQLServer	Oracle
adBigInt	20		BigInt (SQL Server 2000 +)
adBinary	128		Binary TimeStamp	Raw *
adBoolean	11	YesNo	Bit
adChar	129		Char	Char
adCurrency	6	Currency	Money SmallMoney
adDate	7	Date	DateTime
adDBTimeStamp	135	DateTime (Access 97 (ODBC))	DateTime SmallDateTime	Date
adDecimal	14			Decimal *
adDouble	5	Double	Float	Float
adGUID	72	ReplicationID (Access 97 (OLEDB)), (Access 2000 (OLEDB))	UniqueIdentifier (SQL Server 7.0 +)
adIDispatch	9
adInteger	3	AutoNumber Integer Long	Identity (SQL Server 6.5) Int	Int *
adLongVarBinary	205	OLEObject	Image	Long Raw * Blob (Oracle 8.1.x)
adLongVarChar	201	Memo (Access 97) Hyperlink (Access 97)	Text	Long * Clob (Oracle 8.1.x)
adLongVarWChar	203	Memo (Access 2000 (OLEDB)) Hyperlink (Access 2000 (OLEDB))	NText (SQL Server 7.0 +)	NClob (Oracle 8.1.x)
adNumeric	131	Decimal (Access 2000 (OLEDB))	Decimal Numeric	Decimal Integer Number SmallInt
adSingle	4	Single	Real
adSmallInt	2	Integer	SmallInt
adUnsignedTinyInt	17	Byte	TinyInt
adVarBinary	204	ReplicationID (Access 97)	VarBinary
adVarChar	200	Text (Access 97)	VarChar	VarChar
adVariant	12		Sql_Variant (SQL Server 2000 +)	VarChar2
adVarWChar	202	Text (Access 2000 (OLEDB))	NVarChar (SQL Server 7.0 +)	NVarChar2
adWChar	130		NChar (SQL Server 7.0 +)

* 在 Oracle 8.0.x 中 - decimal 和 int 等于 number 和 number(10)。