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Keshaba
Yak Posting Veteran
52 Posts |
 Posted - 2011-06-21 : 09:34:15
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| Hi i am creating a trigger in mysql as given below but it is giving me errors 'Can't update chat_master in stored function / trigger because it is already used by statement which invoked this stored procedure triggerdelimiter $CREATE TRIGGER myTrigger After INSERT ON chat_master FOR EACH ROW BEGIN DECLARE row_count INTEGER; SELECT COUNT(*) INTO row_count FROM chat_master WHERE UM_master_id=NEW.UM_master_id; IF row_count > 0 THEN delete from chat_master where UM_master_id=1; END IF;end $$Can anybody helpKeshab |
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nigelrivett
Master Smack Fu Yak Hacker
3385 Posts |
Posted - 2011-06-21 : 10:11:21
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| In sql server you would generate an error/rollback the transaction to abort the update.Why do you want to delete the row with UM_master_id=1? It says that's the row being inserted (or one of them) I think.Does mysql have the concept of instead of or before triggers?Isn't that if statement a waste of time? The current row will be in the table so row_count will always be at least 1.Could be an if exists to save the count.==========================================Cursors are useful if you don't know sql.SSIS can be used in a similar way.Beer is not cold and it isn't fizzy. |
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mysql problem