trapping errors from assignment of SQL*Plus Input Variables

Is there any way to trap errors from the assignment of a SQL*Plus variable to a PL/SQL variable?

I have this in my executable section:

   v_runcr := &&i_runcr;

(v_runcr is declared as a number)

I want to trap the case where either no value for i_runcr is specified at runtime (and thus the assignment should be NULL) or a non-numeric character is specified (e.g., a letter).

I had hoped the WHEN OTHERS exception would handle it but it does not.

Any ideas?

Thanks
bill

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Author: Magaliff, Bill
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