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ADO 教程
下面的表格列出了 Access、SQL Server 與 Oracle 之間的數據類型映射：
| 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)。