MDAC 2.1 OLE DB Provider for ODBC Fails With Drivers That Don't Support SQLExendedFetch()

• Microsoft Data Access Components versions 2.1, 2.1 (GA), 2.1 SP1, 2.1 SP2

SYMPTOMS

When using the MDAC 2.1 OLE DB Provider for ODBC (MSDASQL) against an ODBC driver that does not support SQLExtendedFetch(), the driver may fail with the following error:

[Microsoft OLE DB Provider for ODBC Drivers] The requested properties cannot be supported by this ODBC Driver

or

[Driver Manufacturer][ODBC Driver Name]Driver not capable

CAUSE

The OLE DB Provider for ODBC incorrectly attempts to set the SQL_ATTR_ROW_ARRAY_SIZE statement attribute before checking to see if it is supported by the ODBC driver. This attribute is not supported in a driver that does not implement SQLExtendedFetch().

RESOLUTION

A supported fix that corrects this problem is now available from Microsoft, but it has not been fully regression tested and should be applied only to systems experiencing this specific problem. If you are not severely affected by this specific problem, Microsoft recommends that you wait for the next Microsoft Data Access Components Service Pack that contains this fix.

To resolve this problem immediately, contact Microsoft Product Support Services to obtain the fix. For a complete list of Microsoft Product Support Services phone numbers and information on support costs, please go to the following address on the World Wide Web:

http://www.microsoft.com/support/supportnet/overview/overview.asp

   Date      Time    Version      Size    File name     Platform
   -------------------------------------------------------------
   7/14/99           02.12.4314   277KB   Msdasql.dll

 

STATUS

Microsoft has confirmed this to be a problem in the Microsoft products listed at the beginning of this article.

MORE INFORMATION

IMPORTANT: You cannot install this hotfix on a machine that is currently running MDAC 2.1 SP1 GA (version 2.10.3711.11) or earlier. You must install MDAC 2.1 SP2 GA (version 2.10.4202) in order to use this hotfix.

In order to alleviate memory fragmentation problems, significant code changes were made to Msdatl2.dll, which this provider is linked with. If this hotfix is installed on a machine that is running MDAC 2.1 SP1 GA (2.10.3711) or earlier, the provider will not load and attempts to register it will fail. Please see the REFERENCES section below for more information

Manual Installation

1. Close or stop any applications or services that are using Msdasql.dll. This may include Internet Information Server (IIS), Microsoft Transaction Server (MTS), Microsoft Distributed Transaction Coordinator (DTC), and any ADO or OLE DB applications.



2. Download the hotfix version of Msdasql.dll into a temporary directory and run it to extract the following files: Msdasql.dll and Readme.txt.



3. Locate and rename the current version of Msdasql.dll, which should be in the \Program Files\Common files\System\Ole db folder.



4. Copy the hotfix version of Msdasql.dll into the same location, and restart your services and applications.

Important Notice for Windows 95 and Windows 98 Users

REFERENCES

Q230101 Data Queries Sporadically Return Empty Recordsets

MDAC 2.1.2.4202.3 (GA)

Additional query words: msdasql ole db odbc provider 2.0 sqlextendedfetch sql attr row array size driver not capable requested properties supported

Keywords : kbADO210fix kbODBC kbOLEDB kbProvider kbGrpVCDB kbGrpMDAC kbADO210sp2fix
Version : WINDOWS:2.1,2.1 (GA),2.1 SP1,2.1 SP2
Platform : WINDOWS
Issue type : kbbug