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I'm trying to handle the connection errors on my program. I wrote this code in OraSession1.OnError:

ShowMessage('Connection Error. Program will close.');
Application.Terminate;

But this event is also fired when there are other errors, like bad queries, field not found, etc..

Is there a better way to handle connection problems?
I tried to check E.Errorcode but there is nothing in the help about the error codes.

To handle connection errors use TOraSesssion.OnError event handler and
check ErrorCode property of EDAError. Oracle error codes you can find in
Oracle help.

Does ErrorCode give the number only in ORA-***** exceptions?

No. To get oracle errors you should check that object E is an instance of EOraError class.