symfony/symfony — pull request #12992 by jeremylivingston (2014-12-15 18:13:12+00:00)
Title: Add LegacyPdoSessionHandler Class

Addresses #12833.

Add a LegacyPdoSessionHandler class to aid users who are having issues upgrading to 2.6. This class does not require a database schema update. It also will keep sessions active after upgrading.