How do you debug MySQL stored procedures?

Question

My current process for debugging stored procedures is very simple. I create a table called \"debug\" where I insert variable values from the stored procedure as it runs. Thi

Answer 1

MySql Connector/NET also includes a stored procedure debugger integrated in visual studio as of version 6.6, You can get the installer and the source here: http://dev.mysql.com/downloads/connector/net/

Some documentation / screenshots: https://dev.mysql.com/doc/visual-studio/en/visual-studio-debugger.html

You can follow the annoucements here: http://forums.mysql.com/read.php?38,561817,561817#msg-561817

UPDATE: The MySql for Visual Studio was split from Connector/NET into a separate product, you can pick it (including the debugger) from here https://dev.mysql.com/downloads/windows/visualstudio/1.2.html (still free & open source).

DISCLAIMER: I was the developer who authored the Stored procedures debugger engine for MySQL for Visual Studio product.

Answer 2

I just simply place select statements in key areas of the stored procedure to check on current status of data sets, and then comment them out (--select...) or remove them before production.

Answer 3

The first and stable debugger for MySQL is in dbForge Studio for MySQL

Answer 4

MySQL Connector/Net 6.6 has a feature to Debug Stored Procedures and Functions

Installing the Debugger

To enable the stored procedure debugger:

• For Connector/Net 6.6: Install Connector/Net 6.6 and choose the Complete option.
• For Connector/Net 6.7 and later: Install the product MySQL for Visual Studio, to which the stored procedure debugger belongs.

Starting the Debugger

To start the debugger, follow these steps:

• Choose a connection in the Visual Studio Server Explorer.
• Expand the Stored Procedures folder. Only stored procedures can be debugged directly. To debug a user-defined function, create a stored
  procedure that calls the function.
• Click on a stored procedure node, then right-click and from the context menu choose Debug Routine.

Answer 5

I had use two different tools to debug procedures and functions:

1. dbForge - many functional mysql GUI.
2. MyDebugger - specialized tool for debugging ... handy tool for debugging.vote http://tinyurl.com/voteimg

Answer 6

The following debug_msg procedure can be called to simply output a debug message to the console:

DELIMITER $$

DROP PROCEDURE IF EXISTS `debug_msg`$$
DROP PROCEDURE IF EXISTS `test_procedure`$$

CREATE PROCEDURE debug_msg(enabled INTEGER, msg VARCHAR(255))
BEGIN
  IF enabled THEN
    select concat('** ', msg) AS '** DEBUG:';
  END IF;
END $$

CREATE PROCEDURE test_procedure(arg1 INTEGER, arg2 INTEGER)
BEGIN
  SET @enabled = TRUE;

  call debug_msg(@enabled, 'my first debug message');
  call debug_msg(@enabled, (select concat_ws('','arg1:', arg1)));
  call debug_msg(TRUE, 'This message always shows up');
  call debug_msg(FALSE, 'This message will never show up');
END $$

DELIMITER ;

Then run the test like this:

CALL test_procedure(1,2)

It will result in the following output:

** DEBUG:
** my first debug message
** DEBUG:
** arg1:1
** DEBUG:
** This message always shows up