锁定MySQL表在Tornado中不起作用

时间:2013-03-20 15:54:45

标签: mysql locking tornado

我有这段代码:

# Retreive the users that can obtain permission on the network except the admin
self.lock_tables("read", ['nets_permissions as n', 'users as u'])
usrs = self.db.query("SELECT distinct u.id FROM users as u \
        left outer join nets_permissions as n on u.id = n.user_id \
        where u.id not in \
        (select users.id from users left outer join nets_permissions \
        on users.id = nets_permissions.user_id \
        where nets_permissions.network_id=%s and nets_permissions.perm=3)", netid)
self.unlock_tables()

但是我在Tornado屏幕中获得了这个错误:

  

文件“./wsn.py”,第571行,在get中       其中nets_permissions.network_id =%s和nets_permissions.perm = 3)“,netid)       raise errorclass,errorvalue OperationalError:(1100,“表'用户'没有用LOCK TABLES锁定”)

错误在哪里?

1 个答案:

答案 0 :(得分:0)

解决方案是:

# Retreive the users that can obtain permission on the network except the admin
    self.lock_tables("read", ['nets_permissions as n', 'users as u', 'nets_permissions as m', 'users as v'])
    usrs = self.db.query("SELECT distinct u.id FROM users as u \
                          left outer join nets_permissions as n on u.id = n.user_id \
                          where u.id not in \
                          (select v.id from users as v left outer join nets_permissions as m \
                          on v.id = m.user_id \
                          where m.network_id=%s and m.perm=3)", netid)
    self.unlock_tables()