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Asked: 2026-05-11T02:38:52+00:00

I have a relatively simple select statement in a VB6 program that I have

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I have a relatively simple select statement in a VB6 program that I have to maintain. (Suppress your natural tendency to shudder; I inherited the thing, I didn’t write it.)

The statement is straightforward (reformatted for clarity):

select distinct     b.ip_address  from     code_table a,     location b  where     a.code_item = b.which_id and     a.location_type_code = '15' and     a.code_status = 'R'

The table in question returns a list of IP addresses from the database. The key column in question is code_status. Some time ago, we realized that one of the IP addresses was no longer valid, so we changed its status to I (invalid) to exclude it from appearing in the query’s results.

When you execute the query above in SQL Plus, or in SQL Developer, everything is fine. But when you execute it from VB6, the check against code_status is ignored, and the invalid IP address appears in the result set.

My first guess was that the results were cached somewhere. But, not being an Oracle expert, I have no idea where to look.

This is ancient VB6 code. The SQL is embedded in the application. At the moment, I don’t have time to rewrite it as a stored procedure. (I will some day, given the chance.) But, I need to know what would cause this disparity in behavior and how to eliminate it. If it’s happening here, it’s likely happening somewhere else.

If anyone can suggest a good place to look, I’d be very appreciative.

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1 Answer

  1. Some random ideas:

    • Are you sure you committed the changes that invalidate the ip-address? Can someone else (using another db connection / user) see the changed code_status?

    • Are you sure that the results are not modified after they are returned from the database?

    • Are you sure that you are using the ‘same’ database connection in SQLPlus as in the code (database, user etc.)?

    • Are you sure that that is indeed the SQL sent to the database? (You may check by tracing on the Oracle server or by debugging the VB code). Reformatting may have changed ‘something’.

    Off the top of my head I can’t think of any ‘caching’ that might ‘re-insert’ the unwanted ip. Hope something from the above gives you some ideas on where to look at.

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