If you don't want to change your SQL then you will have to create a problem at the database end by ensuring some of your SQL fails - e.g., manually create a row which will cause a constraint to fail in your SQL, delete a key, change permissions etc. The possibilities are endless so I'm not listing all I can think of here.

In reply to Re^3: Throw DB error by mje
in thread Throw DB error by Bheema_Tyco

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