我正在尝试捕获由 flask-sqlalchemy 生成的错误。不幸的是，我的代码无法处理该错误，因为调试器首先捕获它。当我尝试将一条记录插入到数据库中时，会发生这种情况，该数据库的字段应该是唯一的但重复了。有什么办法解决这个问题吗？这是追溯。
sqlalchemy.exc.IntegrityError
IntegrityError: (IntegrityError) column username is not unique u'INSERT INTO user (username, password, karma) VALUES (?, ?, ?)' (u'Test', u'test', 0)
Traceback (most recent call last)
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File "/home/josh/Projects/masterpieces_of_code/env/lib/python2.6/site-packages/flask/app.py", line 889, in __call__
[Display the sourcecode for this frame] [Open an interactive python shell in this frame] return self.wsgi_app(environ, start_response)
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File "/home/josh/Projects/masterpieces_of_code/env/lib/python2.6/site-packages/flask/app.py", line 879, in wsgi_app
[Display the sourcecode for this frame] [Open an interactive python shell in this frame] response = self.make_response(self.handle_exception(e))
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File "/home/josh/Projects/masterpieces_of_code/env/lib/python2.6/site-packages/flask/app.py", line 876, in wsgi_app
[Display the sourcecode for this frame] [Open an interactive python shell in this frame] rv = self.dispatch_request()
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File "/home/josh/Projects/masterpieces_of_code/env/lib/python2.6/site-packages/flask/app.py", line 695, in dispatch_request
[Display the sourcecode for this frame] [Open an interactive python shell in this frame] return self.view_functions[rule.endpoint](**req.view_args)
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File "/home/josh/Projects/masterpieces_of_code/app.py", line 70, in create_user
[Display the sourcecode for this frame] [Open an interactive python shell in this frame] db.session.commit()
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File "/usr/share/pyshared/sqlalchemy/orm/scoping.py", line 129, in do
[Display the sourcecode for this frame] [Open an interactive python shell in this frame] return getattr(self.registry(), name)(*args, **kwargs)
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File "/usr/share/pyshared/sqlalchemy/orm/session.py", line 653, in commit
[Display the sourcecode for this frame] [Open an interactive python shell in this frame] self.transaction.commit()
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File "/usr/share/pyshared/sqlalchemy/orm/session.py", line 364, in commit
[Display the sourcecode for this frame] [Open an interactive python shell in this frame] self._prepare_impl()
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File "/usr/share/pyshared/sqlalchemy/orm/session.py", line 348, in _prepare_impl
[Display the sourcecode for this frame] [Open an interactive python shell in this frame] self.session.flush()
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File "/usr/share/pyshared/sqlalchemy/orm/session.py", line 1346, in flush
[Display the sourcecode for this frame] [Open an interactive python shell in this frame] self._flush(objects)
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File "/usr/share/pyshared/sqlalchemy/orm/session.py", line 1427, in _flush
[Display the sourcecode for this frame] [Open an interactive python shell in this frame] flush_context.execute()
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File "/usr/share/pyshared/sqlalchemy/orm/unitofwork.py", line 299, in execute
[Display the sourcecode for this frame] [Open an interactive python shell in this frame] rec.execute(self)
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File "/usr/share/pyshared/sqlalchemy/orm/unitofwork.py", line 443, in execute
[Display the sourcecode for this frame] [Open an interactive python shell in this frame] uow
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File "/usr/share/pyshared/sqlalchemy/orm/mapper.py", line 1833, in _save_obj
[Display the sourcecode for this frame] [Open an interactive python shell in this frame] execute(statement, params)
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File "/usr/share/pyshared/sqlalchemy/engine/base.py", line 1794, in execute
[Display the sourcecode for this frame] [Open an interactive python shell in this frame] object, *multiparams, **params)
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File "/usr/share/pyshared/sqlalchemy/interfaces.py", line 149, in execute
[Display the sourcecode for this frame] [Open an interactive python shell in this frame] return execute(clauseelement, *multiparams, **params)
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File "/usr/share/pyshared/sqlalchemy/engine/base.py", line 1157, in execute
[Display the sourcecode for this frame] [Open an interactive python shell in this frame] params)
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File "/usr/share/pyshared/sqlalchemy/engine/base.py", line 1237, in _execute_clauseelement
[Display the sourcecode for this frame] [Open an interactive python shell in this frame] return self.__execute_context(context)
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File "/usr/share/pyshared/sqlalchemy/engine/base.py", line 1268, in __execute_context
[Display the sourcecode for this frame] [Open an interactive python shell in this frame] context.parameters[0], context=context)
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File "/usr/share/pyshared/sqlalchemy/engine/base.py", line 1806, in _cursor_execute
[Display the sourcecode for this frame] [Open an interactive python shell in this frame] cursor, statement, parameters, context, False)
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File "/home/josh/Projects/masterpieces_of_code/env/lib/python2.6/site-packages/flaskext/sqlalchemy.py", line 115, in cursor_execute
[Display the sourcecode for this frame] [Open an interactive python shell in this frame] return execute(cursor, statement, parameters, context)
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File "/usr/share/pyshared/sqlalchemy/engine/base.py", line 1367, in _cursor_execute
[Display the sourcecode for this frame] [Open an interactive python shell in this frame] context)
*
File "/usr/share/pyshared/sqlalchemy/engine/base.py", line 1360, in _cursor_execute
[Display the sourcecode for this frame] [Open an interactive python shell in this frame] context)
*
File "/usr/share/pyshared/sqlalchemy/engine/default.py", line 288, in do_execute
[Display the sourcecode for this frame] [Open an interactive python shell in this frame] cursor.execute(statement, parameters)
IntegrityError: (IntegrityError) column username is not unique u'INSERT INTO user (username, password, karma) VALUES (?, ?, ?)' (u'Test', u'test', 0)
This is the Copy/Paste friendly version of the traceback. You can also paste this traceback into the public lodgeit pastebin:
Traceback (most recent call last):
File "/home/josh/Projects/masterpieces_of_code/env/lib/python2.6/site-packages/flask/app.py", line 889, in __call__
return self.wsgi_app(environ, start_response)
File "/home/josh/Projects/masterpieces_of_code/env/lib/python2.6/site-packages/flask/app.py", line 879, in wsgi_app
response = self.make_response(self.handle_exception(e))
File "/home/josh/Projects/masterpieces_of_code/env/lib/python2.6/site-packages/flask/app.py", line 876, in wsgi_app
rv = self.dispatch_request()
File "/home/josh/Projects/masterpieces_of_code/env/lib/python2.6/site-packages/flask/app.py", line 695, in dispatch_request
return self.view_functions[rule.endpoint](**req.view_args)
File "/home/josh/Projects/masterpieces_of_code/app.py", line 70, in create_user
db.session.commit()
File "/usr/share/pyshared/sqlalchemy/orm/scoping.py", line 129, in do
return getattr(self.registry(), name)(*args, **kwargs)
File "/usr/share/pyshared/sqlalchemy/orm/session.py", line 653, in commit
self.transaction.commit()
File "/usr/share/pyshared/sqlalchemy/orm/session.py", line 364, in commit
self._prepare_impl()
File "/usr/share/pyshared/sqlalchemy/orm/session.py", line 348, in _prepare_impl
self.session.flush()
File "/usr/share/pyshared/sqlalchemy/orm/session.py", line 1346, in flush
self._flush(objects)
File "/usr/share/pyshared/sqlalchemy/orm/session.py", line 1427, in _flush
flush_context.execute()
File "/usr/share/pyshared/sqlalchemy/orm/unitofwork.py", line 299, in execute
rec.execute(self)
File "/usr/share/pyshared/sqlalchemy/orm/unitofwork.py", line 443, in execute
uow
File "/usr/share/pyshared/sqlalchemy/orm/mapper.py", line 1833, in _save_obj
execute(statement, params)
File "/usr/share/pyshared/sqlalchemy/engine/base.py", line 1794, in execute
object, *multiparams, **params)
File "/usr/share/pyshared/sqlalchemy/interfaces.py", line 149, in execute
return execute(clauseelement, *multiparams, **params)
File "/usr/share/pyshared/sqlalchemy/engine/base.py", line 1157, in execute
params)
File "/usr/share/pyshared/sqlalchemy/engine/base.py", line 1237, in _execute_clauseelement
return self.__execute_context(context)
File "/usr/share/pyshared/sqlalchemy/engine/base.py", line 1268, in __execute_context
context.parameters[0], context=context)
File "/usr/share/pyshared/sqlalchemy/engine/base.py", line 1806, in _cursor_execute
cursor, statement, parameters, context, False)
File "/home/josh/Projects/masterpieces_of_code/env/lib/python2.6/site-packages/flaskext/sqlalchemy.py", line 115, in cursor_execute
return execute(cursor, statement, parameters, context)
File "/usr/share/pyshared/sqlalchemy/engine/base.py", line 1367, in _cursor_execute
context)
File "/usr/share/pyshared/sqlalchemy/engine/base.py", line 1360, in _cursor_execute
context)
File "/usr/share/pyshared/sqlalchemy/engine/default.py", line 288, in do_execute
cursor.execute(statement, parameters)
IntegrityError: (IntegrityError) column username is not unique u'INSERT INTO user (username, password, karma) VALUES (?, ?, ?)' (u'Test', u'test', 0)
The debugger caught an exception in your WSGI application. You can now look at the traceback which led to the error.
To switch between the interactive traceback and the plaintext one, you can click on the "Traceback" headline. From the text traceback you can also create a paste of it. For code execution mouse-over the frame you want to debug and click on the console icon on the right side.
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* dump(obj) dumps all that's known about the object
Brought to you by DON'T PANIC, your friendly Werkzeug powered traceback interpreter.
当我尝试处理错误时，我忘了提及烧瓶的反应。我得到了一些与未定义的全局相关的东西。这是回溯。
Traceback (most recent call last):
File "/home/josh/Projects/masterpieces_of_code/env/lib/python2.6/site-packages/flask/app.py", line 889, in __call__
return self.wsgi_app(environ, start_response)
File "/home/josh/Projects/masterpieces_of_code/env/lib/python2.6/site-packages/flask/app.py", line 879, in wsgi_app
response = self.make_response(self.handle_exception(e))
File "/home/josh/Projects/masterpieces_of_code/env/lib/python2.6/site-packages/flask/app.py", line 876, in wsgi_app
rv = self.dispatch_request()
File "/home/josh/Projects/masterpieces_of_code/env/lib/python2.6/site-packages/flask/app.py", line 695, in dispatch_request
return self.view_functions[rule.endpoint](**req.view_args)
File "/home/josh/Projects/masterpieces_of_code/app.py", line 72, in create_user
except(IntegrityError):
NameError: global name 'IntegrityError' is not defined