error when use multithreading and mysqldb

Question

getting error when multithreader program access data .

Exception in thread Thread-2:

ProgrammingError: (2014, \"Commands out of sync; you can\'t run this co         


        

Answer 1

Thanks to your few informations, I can only guess.

Probably you access the database from several threads without locking. That's bad.

You should hold a lock to a threading.Lock() or threading.RLock() while accessing your DB. This prevents several threads from interfering with other thread's actions.