Re: SqlObject Sqlmeta fromDatabase problem

Hi!

On Sun, Mar 25, 2012 at 06:56:32PM -0500, Jeremy Hoyle wrote:
> I have a problem while trying to use the "fromDatabase = True" option in
> sqlmeta. Any time I enable this. it gives me the connection error below. Is
> there another attribute I need to do before doing this? I saw another
> thread with this problem but the solution was enable the connection before
> the class which I have done.
> 
> from sqlobject import *
> 
> class Companys(SQLObject):
>      def __init__(self):
>         connection_string = 'mysql://user:[email protected]:3306/pySMS'
>         conn = connectionForURI(connection_string,debug = True,autoCommit =
> True)
>         trans = conn.transaction()
>         sqlhub.processConnection = conn
>         Company.createTable(ifNotExists = True, connection=conn)
>         Company._connection.debug = True

   A number of problems here.
1. The connection is created in Companys.__init__ which is not called,
at least it is not called when SQLObject's metaclass processes
fromDatabase. fromDatabase requires an open connection.
2. A transaction is opened but never used. Transaction (trans, in your
case) has to be used instead of connection (in sqlhub, or in every
SQLObject call that accepts connection).

> class Company(SQLObject):
> 
>     class sqlmeta:
>        fromDatabase = True
>        lazyUpdate = True
>        cacheValues = True
> 
>     Company_Name = StringCol(length = 256, default = None)
>     Company_Address = StringCol(length = 256, default = None)
>     Company_Phone = StringCol(length = 256, default = None)
> 
> Traceback (most recent call last):
>   File "C:\Pysoft\Software\SMS Development\tests\test0.py", line 5, in
> <module>
>     from pySMS import Companys
>   File "C:\Pysoft\Software\SMS Development\pySMS\__init__.py", line 1, in
> <module>
>     from Company import Companys
>   File "C:\Pysoft\Software\SMS Development\pySMS\Company.py", line 138, in
> <module>
>     class Company(SQLObject):
>   File
> "C:\Python27\lib\site-packages\sqlobject-1.2.1-py2.7.egg\sqlobject\declarative.py",
> line 92, in __new__
>     cls.__classinit__(cls, new_attrs)
>   File
> "C:\Python27\lib\site-packages\sqlobject-1.2.1-py2.7.egg\sqlobject\main.py",
> line 789, in __classinit__
>     sqlmeta.addColumnsFromDatabase()
>   File
> "C:\Python27\lib\site-packages\sqlobject-1.2.1-py2.7.egg\sqlobject\main.py",
> line 441, in addColumnsFromDatabase
>     conn = connection or soClass._connection
>   File
> "C:\Python27\lib\site-packages\sqlobject-1.2.1-py2.7.egg\sqlobject\dbconnection.py",
> line 902, in __get__
>     return self.getConnection()
>   File
> "C:\Python27\lib\site-packages\sqlobject-1.2.1-py2.7.egg\sqlobject\dbconnection.py",
> line 915, in getConnection
>     "No connection has been defined for this thread "
> AttributeError: No connection has been defined for this thread or process

Oleg.
-- 
     Oleg Broytman            http://phdru.name/            [email protected]
           Programmers don't die, they just GOSUB without RETURN.

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