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I had no better things to do so I was checking the opened bugs for Zeos, when I saw #267 Is rewrapping EZSQLExceptions into EZDatabaseErrors really necessary?.

As far as I'm aware the inheritance flag is already implemented ($DEFINE DO_NOT_DERIVE_FROM_EDATABASEERROR) and I got rid of most of the RaiseUnsupportedException method calls when I added the EZUnsupportedException type (see this and this); at the moment I only see ZDbcBeginnerStatement and ZDbcProxyResultSet using the old, procedure way.

I can fix those two so you can close this ticket if you want :)

I closed the ticket. Its main reason was to reach consent about how to handle exceptions in Zeos - and specifically how to handle that exception reraising on the component layer.