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Check for existence of a trigger
Posted by: CMS
Date: March 10, 2005 04:23PM

(Using 5.0.2-alpha-max)

For tables, you can conditionally drop them. That is, drop them if they exist, or do nothing if they don't.

For example:
DROP TABLE IF EXISTS `MyTable`;

The DROP TRIGGER statement doesn't seem to support the "IF EXISTS" clause. And since attempting to drop a trigger that does not exist causes a 1360 error (Trigger does not exist) and aborts my script, I can't simply have the script try to drop a trigger without know if it's there or not.

In Oracle, I think I could do a "CREATE OR REPLACE". In SQL Server, I could just peek in the sysobjects table to see if an object exists or not. I don't see anything in MySQL where I can look at the object inventory.

Is this just an oversight because I'm using a pre-release version of MySQL or am I just missing the way to see if a trigger already exists?

Thanks.

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CMS
March 10, 2005 04:23PM


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