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set multiple element from select in procedure stored
Posted by: Xavier Manach
Date: December 21, 2009 09:12AM

Hi.

I search a better way for my translation into a procedure stored.

First step : how to set 2 variables from a 'select'.

Sybase :
declare a smallint;
declare b smallint;
select a=col_a, b=col_b from my_table where col_c=1;

mysql solution 1 ... not good because I need to request 2 time :
declare a smallint;
declare b smallint;
set a =select (col_a from my_table where col_c=1);
set b =select (col_b from my_table where col_c=1);

mysql solution 2 ... use a cursor... it's the correct way ?:
declare a smallint;
declare b smallint;
DECLARE cur1 CURSOR FOR col_a, col_b from my_table where col_c=1;
OPEN cur1;
FETCH cur1 INTO a, b;
CLOSE cur1;

There is a best way or shortest way ?

Second Step : how test if exist a line.

Sybase :
declare a smallint;
declare b smallint;
select a=coalesce(col_a,0) , b=coalesce(col_b,0) from my_table where col_c=1;

mysql solution 1 ... not good because I need to request 2 time :
declare a smallint;
declare b smallint;
set a =select (coalesce(col_a,0) from my_table where col_c=1);
set b =select (coalesce(col_b,0) from my_table where col_c=1);

mysql solution 2 ... ??? :
declare a smallint;
declare b smallint;
declare done smallint default 0;
DECLARE cur1 CURSOR FOR col_a, col_b from my_table where col_c=1;
DECLARE CONTINUE HANDLER FOR SQLSTATE '02000' SET done = 1;
OPEN cur1;
if (done=0) then
FETCH cur1 INTO a, b;
else;
set a=0;
set b=0;
end if;
CLOSE cur1;

Thx.
Xavinsky.

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