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)。
