How Can I Effectively Debug MySQL Stored Procedures Using a Console-Based Method?

Debugging MySQL Stored Procedures: A Refined Approach

While inserting variable values into a debug table is a viable method for debugging stored procedures, there exists a more convenient solution. The debug_msg procedure provides a simple means to output debug messages to the console.

Implementing the debug_msg Procedure

The following SQL code creates the debug_msg procedure:

<code class="sql">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 ;</code>

Example Usage

To demonstrate the use of the debug_msg procedure, consider the following test procedure:

<code class="sql">CALL test_procedure(1,2)</code>

Running this procedure will generate the following debug output:

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

By selectively enabling or disabling the debug messages, you can fine-tune the output and focus on the specific areas of interest during debugging. This streamlined approach provides a more efficient and controlled debugging experience for MySQL stored procedures.

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