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[Stephen Hu <838120@xxxxxxxxxxxxxxxxxx>]

done, here's the link to the bug:

https://bugs.launchpad.net/oursql/+bug/906183

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https://bugs.launchpad.net/bugs/838120

Title:
  Queries crash on expired connection in pool.

Status in oursql:
  Fix Committed

Bug description:
  I have a low traffic website that I maintain for my Universities ACM
  student chapter. It wasn't visited in a while since it was the summer.
  When I visited the site it had an error. However, when I refreshed it
  worked fine. This has happened before. Upon investigating the stack
  trace, it appears to be OurSQL trying to use a dead connection to the
  MySQL database. This might only be a problem for a low traffic site,
  but I thought I should report it any way. If you need any more
  information I would be happy to oblige.

  - Ubuntu 10.10
  - mysqld  Ver 5.1.49-1ubuntu8.1 for debian-linux-gnu on x86_64 ((Ubuntu))
  - mysql  Ver 14.14 Distrib 5.1.49, for debian-linux-gnu (x86_64) using readline 6.1
  - oursql.__version__ => '0.9.2'

  crashing query: 
  (SQL Alchemy) 
  Session.query.filter(
                          func.timestampdiff(text('MINUTE'),
                              Session.last_update,
                              datetime.utcnow()) > self.timeout
                          ).delete(False)

  related model:
  CREATE TABLE IF NOT EXISTS `session` (
    `id` int(11) NOT NULL AUTO_INCREMENT,
    `key` varchar(64) COLLATE utf8_bin DEFAULT NULL,
    `sig` tinyblob,
    `sigkey` tinyblob,
    `micro` tinyblob,
    `csrf` tinyblob,
    `user_id` int(11) DEFAULT NULL,
    `last_update` datetime DEFAULT NULL,
    PRIMARY KEY (`id`),
    UNIQUE KEY `ix_session_key` (`key`),
    KEY `user_id` (`user_id`),
    KEY `ix_session_last_update` (`last_update`)
  ) ENGINE=InnoDB  DEFAULT CHARSET=utf8 COLLATE=utf8_bin AUTO_INCREMENT=3179 ;

  --
  -- Dumping data for table `session`
  --

  ## Note I slightly sanitized these rows to remove the sensitive
  private session information.

  INSERT INTO `session` (`id`, `key`, `sig`, `sigkey`, `micro`, `csrf`, `user_id`, `last_update`) VALUES
  (3177, '36e7afddea1ee9d792a78311088ef6533262dc4e80b2db5b8d84c816712258d5', 0xd3529078bb69fcc88a8d2178fc2462f119d2ae3a279f998206486f21c3bd0d4c, 0x5040dae9187c9efbb16df682acd11c229ae7d655b5d55a9d4d88d63021f9e113, 0x0cad0f, NULL, NULL, '2011-08-31 13:22:26'),
  (3178, '502874eee83fc787c5201e4d7e8788decd59850b0e04516885cc3d12da5a9d4d', 0x5a9d4d67cb057c3012a7a570374b26fb0ca712ee8b1b287bca49bdfeda0df206, 0x132a73ba9ad042b837a5a9d4d1546b5ff9fac5d20a63441d9505ce499805b6c0, 0xeca881, NULL, 1, '2011-08-31 13:42:02');

  traceback:

  [20110831-09:24AM] [forhireapp] [ERROR] Exception on / [GET]
  Traceback (most recent call last):
    File "/home/deploy/apps/hackerweb/env/lib/python2.7/site-packages/flask/app.py", line 876, in wsgi_app
      rv = self.dispatch_request()
    File "/home/deploy/apps/hackerweb/env/lib/python2.7/site-packages/flask/app.py", line 695, in dispatch_request
      return self.view_functions[rule.endpoint](**req.view_args)
    File "./lib/supersession.py", line 78, in catcher
      session = self.getsession()
    File "./lib/supersession.py", line 66, in getsession
      self.clear_old_sessions()
    File "./lib/supersession.py", line 36, in clear_old_sessions
      ).delete(False)
    File "/usr/local/lib/python2.7/dist-packages/SQLAlchemy-0.6.6-py2.7.egg/sqlalchemy/orm/query.py", line 2143, in delete
      result = session.execute(delete_stmt, params=self._params)
    File "/usr/local/lib/python2.7/dist-packages/SQLAlchemy-0.6.6-py2.7.egg/sqlalchemy/orm/session.py", line 719, in execute
      return self._connection_for_bind(engine, close_with_result=True).execute(
    File "/usr/local/lib/python2.7/dist-packages/SQLAlchemy-0.6.6-py2.7.egg/sqlalchemy/orm/session.py", line 660, in _connection_for_bind
      return self.transaction._connection_for_bind(engine)
    File "/usr/local/lib/python2.7/dist-packages/SQLAlchemy-0.6.6-py2.7.egg/sqlalchemy/orm/session.py", line 343, in _connection_for_bind
      transaction = conn.begin()
    File "/usr/local/lib/python2.7/dist-packages/SQLAlchemy-0.6.6-py2.7.egg/sqlalchemy/engine/base.py", line 1017, in begin
      self.__transaction = RootTransaction(self)
    File "/usr/local/lib/python2.7/dist-packages/SQLAlchemy-0.6.6-py2.7.egg/sqlalchemy/engine/base.py", line 1554, in __init__
      self.connection._begin_impl()
    File "/usr/local/lib/python2.7/dist-packages/SQLAlchemy-0.6.6-py2.7.egg/sqlalchemy/engine/base.py", line 1076, in _begin_impl
      self._handle_dbapi_exception(e, None, None, None, None)
    File "/usr/local/lib/python2.7/dist-packages/SQLAlchemy-0.6.6-py2.7.egg/sqlalchemy/engine/base.py", line 1074, in _begin_impl
      self.engine.dialect.do_begin(self.connection)
    File "/usr/local/lib/python2.7/dist-packages/SQLAlchemy-0.6.6-py2.7.egg/sqlalchemy/dialects/mysql/oursql.py", line 101, in do_begin
      connection.cursor().execute('BEGIN', plain_query=True)
    File "cursor.pyx", line 107, in oursql.Cursor.execute (oursqlx/oursql.c:15745)
    File "cursor.pyx", line 70, in oursql.Cursor._new_query (oursqlx/oursql.c:15397)
    File "query.pyx", line 137, in oursql._Query.__cinit__ (oursqlx/oursql.c:14254)
    File "query.pyx", line 154, in oursql._Query._raise_error (oursqlx/oursql.c:14506)
    File "connection.pyx", line 180, in oursql.Connection._raise_error (oursqlx/oursql.c:5440)
  OperationalError: (OperationalError) (2006, 'MySQL server has gone away', None) None None

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