FIX: Conversion Errors Occur in Prepared Statements That Use UNIONs

When all of the following conditions are met, unexpected error messages may occur:

• The OLE DB Provider for Microsoft SQL Server (Sqloledb.dll) is used.
• Two or more parameters of different datatypes are used.
• The statement is prepared.
• The statement contains one or more UNION operators

Depending on the exact circumstances the error messages vary widely but may look similar to the following:

You can use either of the two following workarounds to avoid this problem:

• Set the Prepared property of the Microsoft ActiveX Data Object (ADO) Command object to false.
  
  
• Use the OLE DB Provider for ODBC Drivers and the ODBC Driver for Microsoft SQL Server.

Microsoft has confirmed this to be a problem in SQL Server 7.0. This problem has been corrected in U.S. Service Pack 3 for Microsoft SQL Server 7.0. For more information, click the following article number to view the article in the Microsoft Knowledge Base: For more information, contact your primary support provider.