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Microsoft KB Archive/102820

From BetaArchive Wiki

BUG: dbrpcparam SQLCHAR and Sending Null for Datetime Variable


The information in this article applies to:

  • Microsoft SQL Server Programmer's Toolkit, version 4.2

BUG# 9081 (4.2)


In DB-Library function dbrcpparam(), using SQLCHAR type and attempting to send a null value by setting datalen to 0 does not work if the remote stored procedure parameter has variable type as DATETIME.

For example, let the stored procedure be:

   create proc test @var datetime as select @var 

Then calling dbrpcparam with the following parameters, intending to send a null value by setting maxlen=0, as:


displays the default date of 1 Jan, 1900, thereby treating the variable as an empty string instead of a null.


Use SQLDATETIME as the type instead of SQLCHAR to work around this problem.


Microsoft has confirmed this to be a problem in DB-Library version 4.2. We are researching this problem and will post new information here in the Microsoft Knowledge Base as it becomes available.

Additional query words: dblib

Keywords : kbprogramming
Issue type :
Technology : kbSQLServSearch kbAudDeveloper kbSQLServPTK420

Last Reviewed: March 18, 1999
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