Question

I’m using MySQLdb module for Python to make some simple queries. When I do a certain UPDATE, it hangs for a while and finally gives this error:

operational error (1205 ‘lock wait timeout exceeded try restarting
transaction’)

The code I’m using is the following:

def unselectAll():
    try:
        db = MySQLdb.connect(host='localhost', user='user', passwd='', db='mydatabase')
        cursor = db.cursor()
        cursor.execute('UPDATE MYTABLE SET Selected=0')
    except MySQLdb.Error, e:
        print 'ERROR ' + e.args[0] + ': ' + e.args[1]

If I try to use that query in console, works perfectly. Also, if connecting without db parameter and using mydatabase.MYTABLE at the query doesn’t work either.

Any help?

Answer 1

This could be because the UPDATE isn’t getting commited – have you tried autocommit=True for the connection? As in

db = MySQLdb.connect(host='localhost', user='user', passwd='', db='mydatabase', autocommit=True)

or maybe even

db.autocommit(True)

after you’ve created the connection.