Microsoft KB Archive/321989

= Access Violation in OLE DB When You Use ADO to Retrieve Data =

Article ID: 321989

Article Last Modified on 10/11/2005

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APPLIES TO


 * Microsoft Data Access Components 2.5
 * Microsoft Data Access Components 2.6
 * Microsoft Data Access Components 2.7

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This article was previously published under Q321989



SYMPTOMS
When you use Microsoft ActiveX Data Objects (ADO) to retrieve data, an access violation occurs in Oledb32.dll.



CAUSE
This occurs because of a buffer overrun when DB_VARNUMERIC is converted to DB_NUMERIC during data retrieval.



RESOLUTION
A supported hotfix is now available from Microsoft, but it is only intended to correct the problem that is described in this article. Only apply it to systems that are experiencing this specific problem. This hotfix may receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next Microsoft Data Access Components service pack that contains this hotfix.

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 about support costs, visit the following Microsoft Web site:

http://support.microsoft.com/contactus/?ws=support

NOTE: In special cases, charges that are ordinarily incurred for support calls may be canceled if a Microsoft Support Professional determines that a specific update will resolve your problem. The typical support costs will apply to additional support questions and issues that do not qualify for the specific update in question.

The English version of this fix has the file attributes (or later) that are listed in the following table. The dates and times for these files are listed in coordinated universal time (UTC). When you view the file information, it is converted to local time. To find the difference between UTC and local time, use the Time Zone tab in the Date and Time tool in Control Panel.   Date         Version      Size           File Name 26-Apr-2002 2.53.8626.0  483,600 bytes  Oledb32.dll NOTE: Only apply this fix to computers that are running MDAC 2.5 Service Pack 2 or MDAC 2.5 Service Pack 3. For information about the availability of a fix for other systems, contact Microsoft Product Support Services.



STATUS
Microsoft has confirmed that this is a problem in the Microsoft products that are listed at the beginning of this article.



MORE INFORMATION
This problem has been reproduced in a specific scenario in which a simple ADO client (that is written in Visual Basic or Microsoft Visual Basic Scripting Edition [VBScript]) accesses an IBM DB2 (System 390) database through OLE DB by using an Intersolv Sybase Gateway.

Additional query words: crash av

Keywords: kbbug kbfix kbqfe kbhotfixserver KB321989

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