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FIX: Null Parameter for DTS Lookup Causes MMC to Exit

This article was previously published under Q236068
This article has been archived. It is offered "as is" and will no longer be updated.
BUG #: 56011 (SQLBUG_70)
BUG #: 55299 (SQLBUG_70)
When a Data Transformation Services (DTS) package contains a lookup as part of the transformation process and a null parameter value is passed to the Execute method of the lookup, the Microsoft Management Console (MMC) exits with an error.

On a Windows NT system, the error is in the following format:
mmc.exe - Application Error
The instruction at "0xXXXXXXXX" referenced memory at 0xXXXXXXXX".
The memory could not be "read".
Where "0xXXXXXXXX", is a memory address.

On a Windows98 system, the error is as follows:
Microsoft Visual C++ Runtime Library
Runtime Error!
-pure virtual function call
These errors appear twice and then the MMC terminates.
This problem can be avoided by adding a check for NULL values prior to executing the lookup function as follows:
IF isnull(DTSSource("ColumnName")) THEN    DTSDestination("ColumnName") = "SomeValue"ELSE    DTSDestination("ColumnName") = DTSLookups("LookupName").Execute(DTSSource("ColumnName").Value)END IF				
Microsoft has confirmed this to be a problem in SQL Server 7.0. This problem has been corrected in U.S. Service Pack 2 for Microsoft SQL Server 7.0. For more information, click the following article number to view the article in the Microsoft Knowledge Base:
254561 INF: How to Obtain Service Pack 2 for Microsoft SQL Server 7.0 and Microsoft Data Engine (MSDE) 1.0
For more information, contact your primary support provider.
DTS DTSLookups

Article ID: 236068 - Last Review: 10/21/2013 22:50:02 - Revision: 2.1

Microsoft SQL Server 7.0 Standard Edition

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