Question

I would like to debug my stored procedures properly, the easiest way i can think of is to be able to send debug messages to the log file of mysql. is that possible ?!

Answer 1

You can install the User Defined function that is available here…

https://github.com/mysqludf/lib_mysqludf_log

and then use it anywhere in the select query like…

mysql> SELECT log_error(concat(now(), 'error in selecting line 13'));
+--------------------------------------------------------+
| log_error(concat(now(), 'error in selecting line 13')) |
+--------------------------------------------------------+
|                                                      0 |
+--------------------------------------------------------+
1 row in set (0.00 sec)

# tail /var/log/mysqld.log
2010-12-02 03:16:03error in selecting line 13