INF: Checking for an ODBC Driver's Transaction Support (115813)
The information in this article applies to:
- Microsoft Open Database Connectivity 1.5
- Microsoft Open Database Connectivity 2.0
This article was previously published under Q115813 SUMMARY
The appropriate way to check for a driver's support for transactions
is to check the return value from the call to SQLGetInfo with
fSQLType=SQL_TXN_CAPABLE. Relying upon SQLTransact with
fType=SQL_ROLLBACK to return SQL_ERROR to check the transaction
support in not recommended and can lead to unexpected results.
MORE INFORMATION
With ODBC Driver Manager (ODBC.DLL) version 1.5 and later, in case of
drivers that export SQLTransact function, SQLTransact with
fType=SQL_ROLLBACK will return SQL_SUCCESS. However, the actual
driver may not support transactions. SQLGetInfo with
fSQLType=SQL_TXN_CAPABLE with return correct information that the
driver does not support transactions. This is applicable in general
to drivers that support multiple DBMSs.
For example, Database Desktop Drivers fall into the category where
SQLTransact is exported, and hence, SQLTransact with fType=SQL_ROLLBACK
will return SQL_SUCCESS, though the drivers do not support the
transactions. Calling SQLGetInfo with fSQLType=SQL_TXN_CAPABLE
correctly return 0 to indicate that the transactions are not
supported.
| Modification Type: | Major | Last Reviewed: | 6/12/2001 |
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| Keywords: | KB115813 |
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