Simulate mysql queries
You could start a transaction before running your queries and then rollback after running them. Note that to do this you'll require InnoDB or XtraDb tables (won't work on MyISAM).
To start a transaction send to MySQL the following statement:
START TRANSACTION;And at the end of your queries run the following statement:
ROLLBACK;Your database will never be modified from the point of view of other connections. Your current connection will see the changes until ROLLBACK, and after that the original state will be restored.