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Apache::Session::Lock::MySQL - Provides mutual exclusion using MySQL

Apache::Session::Lock::MySQL(3pm) User Contributed Perl Documentation Apache::Session::Lock::MySQL(3pm)


Apache::Session::Lock::MySQL - Provides mutual exclusion using MySQL


 use Apache::Session::Lock::MySQL;
 my $locker = Apache::Session::Lock::MySQL->new();


Apache::Session::Lock::MySQL fulfills the locking interface of Apache::Session. Mutual exclusion is achieved through the use of MySQL's GET_LOCK and RELEASE_LOCK functions. MySQL does not support the notion of read and write locks, so this module only supports exclusive locks. When you request a shared read lock, it is instead promoted to an exclusive write lock.


The module must know how to connect to your MySQL database to acquire locks. You must provide a datasource name, a user name, and a password. These options are passed in the usual Apache::Session style, and are very similar to the options for Apache::Session::Store::MySQL. Example:
 tie %hash, 'Apache::Session::MySQL', $id, {
     LockDataSource => 'dbi:mysql:database',
     LockUserName   => 'database_user',
     LockPassword   => 'K00l'
Instead, you may pass in an already opened DBI handle to your database.
 tie %hash, 'Apache::Session::MySQL', $id, {
     LockHandle => $dbh


This module was written by Jeffrey William Baker <>.


2015-06-07 perl v5.20.2