将 SQLite 和 MySQL 与 Elixir 一起使用时，列不存在，但单独使用时不存在

Question

在我的 Qgis 插件中，我目前必须使用两个数据库：SQLite 和 MySQL，为了与它们交互，我使用 Elixir 0.7.1 和 SqlAlchemy 0.7.4。当我只使用 SQLite 时，一切都很好，最近我添加了 MySQL 的模块，就我单独测试它们而言，它们工作得很好，但是当我把所有这些放在一起时，我从 qgis 得到了这个：

Traceback (most recent call last):
File "/usr/lib/python2.7/dist-packages/qgis/utils.py", line 164, in startPlugin
plugins[packageName] = package.classFactory(iface)
File "/home/giuseppe/.qgis/python/plugins/mmasgis/__init__.py", line 37, in classFactory
return mmasgis(iface)
File "/home/giuseppe/.qgis/python/plugins/mmasgis/mmasgis.py", line 84, in __init__
self.selectionList=Lista()
File "/home/giuseppe/.qgis/python/plugins/mmasgis/lista.py", line 7, in __init__
self.util=utility([],0)
File "/home/giuseppe/.qgis/python/plugins/mmasgis/utility.py", line 266, in __init__
initDB()
File "/home/giuseppe/.qgis/python/plugins/mmasgis/mysqlEntities.py", line 7, in initDB
setup_all()
File "/usr/lib/pymodules/python2.7/elixir/__init__.py", line 94, in setup_all
setup_entities(entities)
File "/usr/lib/pymodules/python2.7/elixir/entity.py", line 951, in setup_entities
method()
File "/usr/lib/pymodules/python2.7/elixir/entity.py", line 240, in setup_relkeys
self.call_builders('create_non_pk_cols')
File "/usr/lib/pymodules/python2.7/elixir/entity.py", line 481, in call_builders
getattr(builder, what)()
File "/usr/lib/pymodules/python2.7/elixir/fields.py", line 155, in create_non_pk_cols
self.create_col()
File "/usr/lib/pymodules/python2.7/elixir/fields.py", line 160, in create_col
self.add_table_column(self.column)
File "/usr/lib/pymodules/python2.7/elixir/properties.py", line 84, in add_table_column
self.entity._descriptor.add_column(column)
File "/usr/lib/pymodules/python2.7/elixir/entity.py", line 493, in add_column
(col.key, self.entity.__name__))
Exception: Column 'nome' already exist in 'Regione' ! 

Versione Python:
2.7.2+ (default, Oct  4 2011, 20:29:37) 
[GCC 4.6.1]


Versione di QGIS:
1.9.90-Alpha Alpha, exported

Percorso Python: ['/usr/share/qgis/python', '/home/giuseppe/.qgis/python', '/home       /giuseppe/.qgis/python/plugins', '/usr/share/qgis/python/plugins', '/usr/local/lib/python2.7/dist-packages/pyshp-1.1.4-py2.7.egg', '/usr/local/lib/python2.7/dist-packages/SQLAlchemy-0.7.4-py2.7-linux-i686.egg', '/usr/lib/python2.7', '/usr/lib/python2.7/plat-linux2', '/usr/lib/python2.7/lib-tk', '/usr/lib/python2.7/lib-old', '/usr/lib/python2.7/lib-dynload', '/usr/local/lib/python2.7/dist-packages', '/usr/lib/python2.7/dist-packages', '/usr/lib/python2.7/dist-packages/Numeric', '/usr/lib/python2.7/dist-packages/PIL', '/usr/lib/python2.7/dist-packages/gst-0.10', '/usr/lib/python2.7/dist-packages/gtk-2.0', '/usr/lib/pymodules/python2.7', '/usr/lib/pymodules/python2.7/ubuntuone-dev-tools', '/usr/lib/pymodules/python2.7/libubuntuone', '/usr/lib/python2.7/dist-packages/ubuntu-sso-client', '/usr/lib/python2.7/dist-packages/ubuntuone-client', '/usr/lib/python2.7/dist-packages/ubuntuone-control-panel', '/usr/lib/python2.7/dist-packages/ubuntuone-couch', '/usr/lib/python2.7/dist-packages/ubuntuone-file-storage-api', '/usr/lib/python2.7/dist-packages/ubuntuone-installer', '/usr/lib/python2.7/dist-packages/ubuntuone-storage-protocol', '/usr/lib/python2.7/dist-packages/wx-2.8-gtk2-unicode', '/usr/share/qgis/python/plugins/fTools/tools', '/home/giuseppe/Documenti/doc/progetti/mmasgis/gianluca/ProgettoGIS', '/home/giuseppe/eclipse/plugins/org.python.pydev.debug_2.3.0.2011121518/pysrc/', '/home/giuseppe/eclipse/plugins/org.python.pydev.debug_2.3.0.2011121518/pysrc/', '/home/giuseppe/eclipse/plugins/org.python.pydev.debug_2.3.0.2011121518/pysrc/', '/home/giuseppe/eclipse/plugins/org.python.pydev.debug_2.3.0.2011121518/pysrc/', '/home/giuseppe/eclipse/plugins/org.python.pydev.debug_2.3.0.2011121518/pysrc/', '/home/giuseppe/eclipse/plugins/org.python.pydev.debug_2.3.0.2011121518/pysrc/', '/home/giuseppe/eclipse/plugins/org.python.pydev.debug_2.3.0.2011121518/pysrc/', '/home/giuseppe/eclipse/plugins/org.python.pydev.debug_2.3.0.2011121518/pysrc/', '/home/giuseppe/eclipse/plugins/org.python.pydev.debug_2.3.0.2011121518/pysrc/', '/home/giuseppe/eclipse/plugins/org.python.pydev.debug_2.3.0.2011121518/pysrc/', '/home/giuseppe/eclipse/plugins/org.python.pydev.debug_2.3.0.2011121518/pysrc/', '/home/giuseppe/eclipse/plugins/org.python.pydev.debug_2.3.0.2011121518/pysrc/', '/home/giuseppe/eclipse/plugins/org.python.pydev.debug_2.3.0.2011121518/pysrc/', '/home/giuseppe/eclipse/plugins/org.python.pydev.debug_2.3.0.2011121518/pysrc/', '/home/giuseppe/eclipse/plugins/org.python.pydev.debug_2.3.0.2011121518/pysrc/', '/home/giuseppe/eclipse/plugins/org.python.pydev.debug_2.3.0.2011121518/pysrc/']

这是我的 SQLite 实体模块： < a href="http://pastebin.com/ya4q9En1" rel="nofollow">http://pastebin.com/ya4q9En1 这是 MySQL 的实体模块： http://pastebin.com/3NypygV4

你能帮我理解我的错误是？

Answer 1

不要使用长生不老药。如今，SQLAlchemy 的内置声明式具有其大部分功能，并且您将获得比 Elixir 更好的支持。

Answer 2

我将我的应用程序从 elixir 翻译为 sqlalchemy，但我仍然收到相同的错误消息，我开始认为问题不在我的代码中，但在 sqlite db 中，这不是我第一次使用 elixir 创建的数据库有故障。