From: | Josh Berkus <josh(at)agliodbs(dot)com> |
---|---|
To: | "Greg Patnude" <gpatnude(at)hotmail(dot)com>, pgsql-sql(at)postgresql(dot)org |
Subject: | Re: User defined types -- Social Security number... |
Date: | 2004-02-22 19:32:50 |
Message-ID: | 200402221132.50311.josh@agliodbs.com |
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Lists: | pgsql-hackers pgsql-sql |
Greg,
> Anyone have a good pre-built user-defined type definition for creating /
> maintaining / manipulating a SSN ... where valid chars are in the range
> 000-00-0000 through 999-99-9999.
Actually, the range is more narrowly defined than that. I'm not sure of the
exact rules, but you will never see a leading 0 or a -00- in an SSN.
> I imagine that the storage column is probably varchar(11) -- I am looking
> for a type definition that
Use DOMAINs, not a custom type. It's less work.
> Either that or the question is: How can I coerce postgreSQL into using an
> input / output "mask"...
After you've created your DOMAIN, based on the TEXT type, you can overload the
input and output functions to format correctly. Beware, though: input &
output functions pretty much have to be written in C.
--
Josh Berkus
Aglio Database Solutions
San Francisco
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