To disable comments on posts older than date X in WordPress you can use the snippet below.
Sample mySQL
UPDATE wp_posts SET comment_status = 'closed' WHERE post_date < '2013-01-01' AND post_status = 'publish'
give
How to give a user admin rights in mySql
To give a user admin rights in MySql you can use the following snippet.
Sample mySql Query
GRANT ALL PRIVILEGES ON myDbName.* TO 'myUserName'@'%' WITH GRANT OPTION;
How to show all errors in PHP
To show all errors in PHP you can use the following snippet.
Sample PHP
error_reporting(E_ALL);
ini_set('display_errors', '1');