I currently have a mysql database that is defined using pydal and used by
several other applications. I am trying to use Web2py to create an
interface with the existing database.
For testing I mirrored the schema of the database using sqlite and now that
the project is ready I want to connect it to the mysql database, but I'm
receiving the following error when trying to query the database from the
controller:
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Traceback (most recent call last):
File "/Users/jon/github/build/web/gluon/restricted.py", line 219, in
restricted
exec(ccode, environment)
File
"/Users/jon/github/build/web/applications/project/controllers/scenarios.py"
<http://localhost:8000/admin/edit/cerebro/controllers/scenarios.py>, line 349,
in <module>
File "/Users/jon/github/build/web/gluon/globals.py", line 414, in <lambda>
self._caller = lambda f: f()
File "/Users/jon/github/build/web/gluon/tools.py", line 3981, in f
return action(*a, **b)
File "/Users/jon/github/build/web/applications/
<http://localhost:8000/admin/edit/cerebro/controllers/scenarios.py>project
<http://localhost:8000/admin/edit/cerebro/controllers/scenarios.py>/controllers/scenarios.py"
<http://localhost:8000/admin/edit/cerebro/controllers/scenarios.py>, line 207,
in show
use_case_set = list({row.use_case_name for row in
mysql_db(mysql_db.build_scenarios).select()})
File "/Users/jon/.env/build/lib/python2.7/site-packages/pydal/objects.py",
line 2250, in select
return adapter.select(self.query, fields, attributes)
File
"/Users/jon/.env/build/lib/python2.7/site-packages/pydal/adapters/base.py",
line 762, in select
return self._select_aux(sql, fields, attributes, colnames)
File
"/Users/jon/.env/build/lib/python2.7/site-packages/pydal/adapters/base.py",
line 718, in _select_aux
rows = self._select_aux_execute(sql)
File
"/Users/jon/.env/build/lib/python2.7/site-packages/pydal/adapters/base.py",
line 712, in _select_aux_execute
self.execute(sql)
File
"/Users/jon/.env/build/lib/python2.7/site-packages/pydal/adapters/__init__.py",
line 63, in wrap
if not args[0].connection:
File "/Users/jon/.env/build/lib/python2.7/site-packages/pydal/connection.py",
line 36, in connection
return getattr(THREAD_LOCAL, self._connection_uname_)
AttributeError: 'thread._local' object has no attribute
'_pydal_connection_4382647568_28651'
To make things stranger, the query is sometimes successful on the first
attempt after restarting the server, but a refresh always results in the
error. Also using the web2py shell and loading the modules from the
project, I am able to connect to the mysql database without error, and run
the same query repeatedly without any issues.
--
Resources:
- http://web2py.com
- http://web2py.com/book (Documentation)
- http://github.com/web2py/web2py (Source code)
- https://code.google.com/p/web2py/issues/list (Report Issues)
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