[GENERAL] Error handling inside PL/pgSQL functions

[Germán Hüttemann Arza]

I am writing triggers procedures in PL/pgSQL and I need to handle some errors inside the procedures.
Specifically, I am doing a CAST(char AS integer) and I want to know when the char isn't a digit. How can I get do that?

Regards,

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Germán Hüttemann