Data Type Mappings
The following table lists the mappings between variant data types and OLE DB data types.
| Variant data type | OLE DB data type |
|---|---|
| VT_BOOL | DBTYPE_BOOL |
| VT_BSTR | DBTYPE_BSTR |
| VT_BYREF | DBTYPE_BYREF |
| VT_CY | DBTYPE_CY |
| VT_DATE | DBTYPE_DATE |
| VT_DECIMAL | DBTYPE_DECIMAL |
| VT_EMPTY | DBTYPE_EMPTY |
| VT_FILETIME | DBTYPE_FILETIME |
| VT_GUID | DBTYPE_GUID |
| VT_I1 | DBTYPE_I1 |
| VT_I2 | DBTYPE_I2 |
| VT_I4 | DBTYPE_I4 |
| VT_I8 | DBTYPE_I8 |
| VT_NULL | DBTYPE_NULL |
| VT_R4 | DBTYPE_R4 |
| VT_R8 | DBTYPE_UI8 |
| VT_VECTOR | DBTYPE_VECTOR |
| VT_WSTR | DBTYPE_WSTR |
The following table lists the mappings between XML data types and OLE DB data types.
| Variant data type | OLE DB data type |
|---|---|
| BIN.BASE64 | DBTYPE_BYTES |
| BIN.HEX | DBTYPE_I8 |
| BOOLEAN | DBTYPE_BOOL |
| CHAR | DBTYPE_STR |
| DATE | DBTYPE_DATE |
| DATETIME | DBTYPE_DATE |
| DATETIME.TZ | DBTYPE_DATE |
| FIXED.14.4 | DBTYPE_R4 |
| FLOAT | DBTYPE_R8 |
| I1 | DBTYPE_I1 |
| I2 | DBTYPE_I2 |
| I4 | DBTYPE_I4 |
| I8 | DBTYPE_I8 |
| INT | DBTYPE_I8 |
| LONG | DBTYPE_I4 |
| NUMBER | DBTYPE_R8 |
| R4 | DBTYPE_R4 |
| R8 | DBTYPE_R8 |
| STRING | DBTYPE_WSTR |
| TIME | DBTYPE_FILETIME |
| TIME.TZ | DBTYPE_FILETIME |
| UI1 | DBTYPE_UI2 |
| UI2 | DBTYPE_UI2 |
| UI4 | DBTYPE_UI4 |
| UI8 | DBTYPE_UI8 |
| URI | DBTYPE_WSTR |
| UUID | DBTYPE_GUID |
You can cast string data to other data types. For more information,refer to Casting the Data Type of a Column.