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Re: numericOnly trigger

From: Sean Davis <sdavis2(at)mail(dot)nih(dot)gov>
To: list(at)blueaxis(dot)com
Cc: pgsql-novice(at)postgresql(dot)org
Subject: Re: numericOnly trigger
Date: 2007-09-21 17:31:27
Message-ID: 46F3FFEF.70702@mail.nih.gov (view raw or flat)
Thread:
Lists: pgsql-novice
Derrick Betts wrote:
> I was wondering if anyone has built a trigger or etc. that verifies the
> validity of an entry that is being posted to the database. I would like
> to do the following:
>    1.    Iterate through the column types in the table being updated
>    2.    If the column type is numeric or real, or etc.,
>        a. remove all the strings from the New.value
>        b. set the New.value to the newly stripped value
>     3.    Update the table with the modified values.
> 
> The part I was hoping not to have to reproduce, if anyone has it and is
> willing to share it, is the logic for iterating through the column types
> and cleaning the specific values for update.

I might be wrong, but I do not think your trigger will not actually fire
if you try to do an update with text data in a column with a numeric
datatype.  The type checking happens BEFORE a trigger fires, so you will
simply get an error.

Sean

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