Constraint Error

Hi everyone, I got a Constraint Error, I Know the motive and I think how to fix it. But I need get a handle erro. CI only show the message below.


Error Number:
DELETE FROM GCC_CONTRATOS WHERE ID_CONTRATO = '124'
Filename: /vagrant/gcc/models/contratos_model.php
Line Number: 183

My question is. Where the error number? How to get it? How to show a friendly message to my users?

I use CI 2.x with Oracle.

Thanks in advanced.

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