Simple, get a return code from the called procedure to determine if it worked or not!

Here’s a sample piece of code to explain better:


DROP PROCEDURE IF EXISTS `test`.`testing123`;
DELIMITER $$

CALL `test`.`testing456` ();


testing123 is the second stored proc in this case, called from testing456. The trick is to have an exit handler which returns a status number to the first stored proc (testing456). The latter will hold an if condition to do `something` depending on the return code received by testing123.

If you have any other suggestions I’d appreciate your input.

Scenario part 1 : Migrating a couple thousand stored procedures from database technology X to mysql
Scenario part 2 : Legacy system where the people who wrote it left a long time ago
Scenario part 3 : Developers sure can get real creative and invent all kinds of ways to get data (eg: having a stored proc which formulates a big query using concat after going through a bunch of conditions (fair enough), BUT the parts making up the different queries are stored in a table on a database rather than within the stored proc itself) … talk about KIS – Keep it simple!!
Scenario part 4 : This stored proc references 18 tables, 4 views, and another two stored procedures on 5 databases

Now close your eyes and try to imagine that for a few seconds, nah kidding don’t want you to hurt yourself.

I wonder, who’s gonna cover my health insurance if i go crazy? :)

mysql 02:55:47 DEV > call storedprocblahbla(‘I’,'am’,'going’,'crazy’);
ERROR 1052 (23000): Column ‘state_of_mind’ in field list is ambiguous

Sure thats REALLY REALLY helpful thanks :), you know what, lets just mysqldump -d -R -B db1 db2 db3 db4 db5 > /wherever/you/like and grep for column ‘state_of_mind’.

I love a challenge but facing migration of so many stored procs I’d really love to have something “GOOD” to debug them with.

The solutions I found were:
1. Illatis eclipse plugin for $40
works on linux, mac and windows but does show me a lot of:
“An error has occurred when activating this view
com/illatis/parser/lib/k”
2. mydebugger for $50
works on linux and mac via wine
3. dbForge for MySQL for $50
works only on windows due to .net framework (kinda crap because I `hate` using the former)

any other ideas are very welcome, especially opensource ones but I can’t find anything.

I can always try setting up debugging using GDB but would rather try to avoid that.

Here is a small stored procedure which does exactly that!

call process_list("show","username","hostname");
– shows all processes owned by username@hostname
call process_list("kill","username","hostname");
– kills all processes owned by username@hostname

The code for this stored procedure can be found below. If you have any comments / suggestions feel free to comment below.

######################################################################
## ##
## Stored Procedure: process_list & kill user ##
## call process_list("show","%") show processlist for all users ##
## call process_list("show","root") show processlist for root user ##
## call process_list("kill","user1") kill connections for user1 ##
## ##
## by Darren Cassar http://www.mysqlpreacher.com ##
## ##
######################################################################

DROP PROCEDURE IF EXISTS process_list;

DELIMITER $$

CREATE PROCEDURE "process_list"( choice char(4), usernamein varchar(16), hostnamein varchar(60))
BEGIN

DECLARE CURCONN int;

IF choice <> "show" AND choice <> "kill" then
select "wrong choice";
END IF;

IF usernamein = "" then
set usernamein = "%";
END IF;

IF hostnamein = "" then
set hostnamein = "%";
END IF;

SET CURCONN=(select connection_id());

IF choice = "show" then

select *
from information_schema.processlist
where ID <> CURCONN and
USER like usernamein and
( HOST like CONCAT(hostnamein ,":%") or
HOST like hostnamein );

ELSEIF choice = "kill" then

IF usernamein = "root" then
select "Illegal username when killing processes";
ELSE
SET @CNT = (
select count(*)
from information_schema.processlist
where ID <> CURCONN and
USER like usernamein and
( HOST like CONCAT(hostnamein ,":%") or
HOST like hostnamein )
);

SET @VAR=1;

WHILE ( @VAR <= @CNT) DO

SET @TID = (
select id
from information_schema.processlist
where ID <> CURCONN and
USER like usernamein and
( HOST like CONCAT(hostnamein ,":%") or
HOST like hostnamein ) limit 1
);

SET @k = CONCAT("kill " , @TID);
PREPARE killcom FROM @k;
EXECUTE killcom;
set @k=NULL;

SET @VAR=@VAR+1;

END WHILE;

END IF;

END IF;

END$$

DELIMITER ;