Re: isnumeric() function?

From: "Yudie" <yudie(at)axiontech(dot)com>
To: <pgsql-sql(at)postgresql(dot)org>
Subject: Re: isnumeric() function?
Date: 2004-04-30 15:29:16
Message-ID: 003601c42ec7$e7806ee0$8401a8c0@home.axiontech.com
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Great the function works, but what does it means?
SELECT $1 ~ ''^[0-9]+$''

Yudie

----- Original Message -----
From: "Jeff Eckermann" <jeff_eckermann(at)yahoo(dot)com>
To: "Yudie" <yudie(at)axiontech(dot)com>; <pgsql-sql(at)postgresql(dot)org>
Sent: Friday, April 30, 2004 9:11 AM
Subject: Re: [SQL] isnumeric() function?

--- Yudie <yudie(at)axiontech(dot)com> wrote:
> What is isnumeric function in postgresql?
> I'm using psql version 7.2.2
> thanks
> Yudie

I don't think that function is included as such. But
you could do something like:

CREATE FUNCTION isnumeric(text) RETURNS boolean AS '
SELECT $1 ~ ''^[0-9]+$''
' LANGUAGE 'sql';

Note that you would need to create this function for
every parameter datatype that you would intend to use,
or else be prepared to cast your input datatype as
appropriate.

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