From: Shawn Green (MySQL)
Date: September 2 2011 12:18pm
Subject: Re: Arrays
List-Archive: http://lists.mysql.com/mysql/225636
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Hello Javad,

On 9/2/2011 05:51, javad bakhshi wrote:
> Hi again,
>
> Thanks for the tips. My problem is:
> I have a Function in Mysql that has some arguments in the signature as
> follows:
>
> CREATE FUNCTION Myfunction( type TINYINT, sec SMALLINT, vid INTEGER,
> way TINYINT, quid INTEGER, day TINYINT )
> RETURNS CHAR(50)
> BEGIN
> DECLARE result CHAR(50);
> DECLARE Temp DECIMAL(9,1);
> SELECT Table1( vid, day, way) INTO Temp;
> IF Temp IS NOT NULL THEN
> SELECT CONCAT_WS(',',sec, 0, quid, Temp) into result;
>
> ELSE
>
> SELECT CONCAT_WS(',',sec, 0, quid, 0 ) into result;
>
> END IF;
> RETURN result;
> END;
>
>
> The problem seems to be solved by using CHAR but I really want to have a
> sequence of Integers as the result not CHAR. The reason that I dont use
> a table to insert the result into it and retrieve it later is that this
> process takes more time that It should. Any thoughts?

Actually, that's not 'the problem' you are attempting to solve at all. 
That is an attempt at a 'solution' to the problem.

If I stare very hard into my crystal ball and use all of my 
psychic-SQL-fu, all I can tell is that you are attempting to build some 
kind of comma-separated value. However, why you need this list and what 
it is trying to solve is beyond me.

Please step back from the SQL end of things for a second and talk to us 
about the actual problem you are trying to solve. Are you generating 
nuclear launch codes? Are you indexing someone's genome? Are you trying 
to build a web page? All of this SQL coding is designed to be a single 
step in some larger process. If you share that larger purpose with us, 
we may be able to suggest a more efficient approach than arrays to solve 
your larger problem.

Regards,
-- 
Shawn Green
MySQL Principal Technical Support Engineer
Oracle USA, Inc. - Hardware and Software, Engineered to Work Together.
Office: Blountville, TN