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Hi.

How can I catch an Oracle error (like TOraErrorHandler component) not using the TOraSession.OnError event?
How do the TOraErrorHandler determine a constraint name given in a Oracle error message?

You can use Application.OnError event handler and catch any types of error you need. To determine constraint name TOraErrorHandler uses SQL query to Oracle.

I cannot use Application.OnError.

You can use standard Try-except solution.