2007/10/30, Alexis Beuraud <[EMAIL PROTECTED]>:
> Dear all,
>
> What is the correct way to check whether an array is empty?
> I have an array which I initialize with '{}' and then do som array_append
> under some circonstances. I would like to know whether the array is empty at
> the end of the function. I have not found the answer in the help page nor on
> the web. I use the keyword isnull but that does not seem to work in all the
> cases.
> I would appreciate if someone could put this piece of information into the
> Postgres documentation.
>
> Here is what I do, in pseudo-code:
>
> myarray varchar[];
> myarray := '{}';
>
> FOR ___ LOOP
> IF (___) THEN
> myarray := array_append(myarray, somestuff);
> END IF;
> END LOOP;
>
> -- Is my array empty now?
> IF (myarray isnull) THEN
> __
> END IF;
>
IF (array_upper(myarray,1) is null) THEN
....
END IF;
Regards
Pavel Stehule
> Regards,
> Alexis Beuraud
>
>
> ---------------------------(end of broadcast)---------------------------
> TIP 1: if posting/reading through Usenet, please send an appropriate
> subscribe-nomail command to [EMAIL PROTECTED] so that your
> message can get through to the mailing list cleanly
>
---------------------------(end of broadcast)---------------------------
TIP 2: Don't 'kill -9' the postmaster
