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Delphi SQL and Interbase Triggers

Posted on 1997-08-11
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Last Modified: 2010-04-04
Howdy;

It appears that when I do an SQL INSERT from a Query Component with the ExecSQL method, it appears that my BEFORE INSERT Trigger to generate my primary key is not getting triggered... because it gives me an error that I'm trying to insert a NULL primary Key... Any ideas on how to get that to fire off the trigger on INSERT?  (It also doesnt fire off the BEFORE DELETE Trigger!)

Thanks

Roger Webb
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Question by:Whytboy
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KE earned 200 total points
ID: 1341111
The problem with triggers is that the before/after terms are related to you database server, and not how Delphi handles the transaction. Your database server (or local server) will not insert your record as long as Delphi is holding it back, because of the missing key. What i'm trying to say is that the server is never being told to insert the record as long as the record fails validation in Delphi - and this is the reason for the unfired trigger.
To solve the problem, just insert the key field manually into the dataset, and set the "Required" property to false. After a (hopefully) succesfull insert, you may need to refresh the dataset to get the key field updated.

Kenneth Ellested
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Author Comment

by:Whytboy
ID: 1341112
Thanks... sorry it took so long.
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