type cast/validation functions

as i posted a few weeks ago, it is a handicap for me writing client side 
appliciations with postgres, that you cant catch errorcodes - especially 
after type casts. so you have to rewrite type check functions for every 
client system.

programers life would become a lot easier if one would be able to let the 
db-system do this work.

to remove this drawback i wrote a c-module for parsing/casting input data 
and integrated it into postgres.

if someone is interested in my solution there is a demo and a short 
description available at

http://www.wiro.co.at/postgres/test/demo_en.php

please let me know, what you think about this solution.

regards sepp wimmer

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