Fwd: Re: Creating a function with single quotes

Oops, forgot to reply to list.

---------- Forwarded Message ----------

Subject: Re: [SQL] Creating a function with single quotes
Date: Thursday 19 February 2009
From: Adrian Klaver <aklaver(at)comcast(dot)net>
To: stayler(at)washoecounty(dot)us

On Thursday 19 February 2009 7:41:11 am Shawn Tayler wrote:
> Hello,
>
> This has me befuddled. I am trying create a simple experiment, rather
> new to SQL and I am running into an issue with single quotes. All I can
> find on creating a function states the procedure should be contained
> within single quotes. My problem comes when I want to use a textual
> representation of an interval.
>
> create function csd_interval(integer) returns interval as
> 'BEGIN
> RETURN $1 * interval '1 msec'
> END;'
> LANGUAGE 'plpgsql';
>
> it always fails at the '1 msec' point.
>
> Suggestions?
> --
> Sincerely,
>
>

Two suggestions
One, double the quotes

create function csd_interval(integer) returns interval as
'BEGIN
RETURN $1 * interval ''1 msec''
END;'
LANGUAGE 'plpgsql';

Two, better to use dollar quoting

create function csd_interval(integer) returns interval as
$$
BEGIN
RETURN $1 * interval '1 msec'
END;
$$
LANGUAGE 'plpgsql';

See
http://www.postgresql.org/docs/8.3/interactive/plpgsql-development-tips.html

--
Adrian Klaver
aklaver(at)comcast(dot)net

-------------------------------------------------------

--
Adrian Klaver
aklaver(at)comcast(dot)net