Edgewall Software

Opened 15 years ago

Closed 15 years ago

Last modified 2 years ago

#5012 closed defect (worksforme)

'module' object has no attribute 'connect'

Reported by: hall@… Owned by: Christopher Lenz
Priority: normal Milestone:
Component: web frontend/mod_python Version:
Severity: normal Keywords: mysql
Cc: Branch:
Release Notes:
API Changes:
Internal Changes:


When this error happens, I would leave my Trac site Idle for a while.

Later, my Trac site is suddenly back to normal. Then, I start working with Trac, post some Tickets, add some Wiki. Then, this error starts to show up again.

So guess what I did, yup, I leave my Trac site Idle for a while. So it goes in a loop.

Please help!!

Traceback (most recent call last):

  File "/usr/lib/python2.3/site-packages/mod_python/importer.py", line 1537, in HandlerDispatch
    default=default_handler, arg=req, silent=hlist.silent)

  File "/usr/lib/python2.3/site-packages/mod_python/importer.py", line 1229, in _process_target
    result = _execute_target(config, req, object, arg)

  File "/usr/lib/python2.3/site-packages/mod_python/importer.py", line 1128, in _execute_target
    result = object(arg)

  File "/usr/lib/python2.3/site-packages/trac/web/modpython_frontend.py", line 87, in handler

  File "/usr/lib/python2.3/site-packages/trac/web/wsgi.py", line 87, in run
    response = application(self.environ, self._start_response)

  File "/usr/lib/python2.3/site-packages/trac/web/main.py", line 377, in dispatch_request
    env = _open_environment(env_path, run_once=run_once)

  File "/usr/lib/python2.3/site-packages/trac/web/main.py", line 58, in _open_environment
    env_cache[env_path] = open_environment(env_path)

  File "/usr/lib/python2.3/site-packages/trac/env.py", line 435, in open_environment
    if env.needs_upgrade():

  File "/usr/lib/python2.3/site-packages/trac/env.py", line 313, in needs_upgrade
    db = self.get_db_cnx()

  File "/usr/lib/python2.3/site-packages/trac/env.py", line 182, in get_db_cnx
    return DatabaseManager(self).get_connection()

  File "/usr/lib/python2.3/site-packages/trac/db/api.py", line 75, in get_connection
    return self._cnx_pool.get_cnx(self.timeout or None)

  File "/usr/lib/python2.3/site-packages/trac/db/pool.py", line 101, in get_cnx
    cnx = self._connector.get_connection(**self._kwargs)

  File "/usr/lib/python2.3/site-packages/trac/db/mysql_backend.py", line 40, in get_connection
    return MySQLConnection(path, user, password, host, port, params)

  File "/usr/lib/python2.3/site-packages/trac/db/mysql_backend.py", line 139, in __init__
    cnx = MySQLdb.connect(db=path, user=user, passwd=password,

AttributeError: 'module' object has no attribute 'connect'

Attachments (0)

Change History (10)

comment:1 by Emmanuel Blot, 15 years ago

Keywords: needinfo added

Which version of Trac, which version of MySQLdb are you using?

Have you installed some plugins?

comment:2 by Hall@…, 15 years ago


comment:3 by HallXE, 15 years ago

I'm using Trac, MySQL 5.0.27, python-2.3, MySQL_python-1.2.2.

comment:4 by HallXE, 15 years ago

Plugins I have installed:

comment:5 by Christian Boos, 15 years ago

Component: generalmod_python frontend
Milestone: 0.10.5
Owner: changed from Jonas Borgström to Christopher Lenz

Can you try to add:

PythonInterpreter main_interpreter

in your <Location> section?

comment:6 by Christian Boos, 15 years ago

Also, what mod_python version are you using? Do you also have PHP active in that setup? (see possibly related #4459)

In order to sort out what's happening, can you make the following changes?

Index: trac/db/mysql_backend.py
--- trac/db/mysql_backend.py	(revision 5135)
+++ trac/db/mysql_backend.py	(working copy)
@@ -145,6 +145,9 @@
     def __init__(self, path, user=None, password=None, host=None,
                  port=None, params={}):
         import MySQLdb
+        print `MySQLdb`
+        from pprint import pprint        
+        pprint(MySQLdb.__dict__)
         if path.startswith('/'):
             path = path[1:]

comment:7 by HallXE, 15 years ago

Resolution: fixed
Status: newclosed

Your suggestion PythonInterpreter main_interpreter reminded me I probably have multiple versions of python laying around because previously I did a yum install on python & mysql-python and didn't find it quite right. So I recompiled them from source but didn't remove the old one.

I might be wrong but my guess is Trac was randomly using either one of the interpreter, that's why this happens once in a while.

Thanks a lot for the input cboos though I didn't follow your suggestions. I just removed all python & mysql-python and recompiled them.

My Trac is site is working fine now.

comment:8 by anonymous, 15 years ago

Keywords: needinfo removed
Milestone: 0.10.5
Resolution: fixed
Status: closedreopened

comment:9 by Christian Boos, 15 years ago

Keywords: mysql added
Resolution: worksforme
Status: reopenedclosed

Ok, I'm glad it works for you now. However we missed the opportunity to know a little more about this kind of strange error messages. If someone else experiences this in the future, please follow-up on #4459 instead of reopen this ticket, thanks!

comment:10 by lefin17@…, 2 years ago

In my case there is chmod (access rights to installed module, there was only 0700) after I've fix it, I've get full functionality.

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