Allows multiple users to operate data tables simultaneously in php.

When multiple people insert or update the same table at the same time, the same data may occur many times or some strange problems, you can use the mysql lock table mechanism to queue up to solve this problem. before inserting data in php, LOCK the table // lock talbe write $ SQL = "lock tables alliance_perf WRITE"; mysql_query ($ SQL, $ this-> mysql-> conn); unset ($ SQL ); /////// here is the data insert operation // unlock table $ SQL = "unlock tables"; mysql_query ($ SQL, $ this-> mysql-> conn ); unset ($ SQL );