python - Flask写的注册页面，当注册时，如果填写数据库里有的相同数据，就报错
Flask写的注册页面，当注册时，如果填写数据库里有的相同数据，就报错
想知道如何解决
注册路由代码
注册页面代码
报错
E:\Python\Python35-32\lib\site-packages\pymysql\cursors.py:166: Warning: (1366, "Incorrect string value: '\\xD6\\xD0\\xB9\\xFA\\xB1\\xEA...' for column 'VARIABLE_VALUE' at row 479")
result = self._query(query)
127.0.0.1 - - [21/Feb/2017 09:17:37] "POST /register HTTP/1.1" 200 -
Debugging middleware caught exception in streamed response at a point where response headers were already sent.
Traceback (most recent call last):
File "E:\Python\Python35-32\lib\site-packages\flask\app.py", line 2000, in __call__
return self.wsgi_app(environ, start_response)
File "E:\Python\Python35-32\lib\site-packages\flask\app.py", line 1996, in wsgi_app
ctx.auto_pop(error)
File "E:\Python\Python35-32\lib\site-packages\flask\ctx.py", line 387, in auto_pop
self.pop(exc)
File "E:\Python\Python35-32\lib\site-packages\flask\ctx.py", line 376, in pop
app_ctx.pop(exc)
File "E:\Python\Python35-32\lib\site-packages\flask\ctx.py", line 189, in pop
self.app.do_teardown_appcontext(exc)
File "E:\Python\Python35-32\lib\site-packages\flask\app.py", line 1898, in do_teardown_appcontext
func(exc)
File "E:\Python\Python35-32\lib\site-packages\flask_sqlalchemy\__init__.py", line 822, in shutdown_session
self.session.commit()
File "E:\Python\Python35-32\lib\site-packages\sqlalchemy\orm\scoping.py", line 157, in do
return getattr(self.registry(), name)(*args, **kwargs)
File "E:\Python\Python35-32\lib\site-packages\sqlalchemy\orm\session.py", line 874, in commit
self.transaction.commit()
File "E:\Python\Python35-32\lib\site-packages\sqlalchemy\orm\session.py", line 461, in commit
self._prepare_impl()
File "E:\Python\Python35-32\lib\site-packages\sqlalchemy\orm\session.py", line 441, in _prepare_impl
self.session.flush()
File "E:\Python\Python35-32\lib\site-packages\sqlalchemy\orm\session.py", line 2139, in flush
self._flush(objects)
File "E:\Python\Python35-32\lib\site-packages\sqlalchemy\orm\session.py", line 2259, in _flush
transaction.rollback(_capture_exception=True)
File "E:\Python\Python35-32\lib\site-packages\sqlalchemy\util\langhelpers.py", line 60, in __exit__
compat.reraise(exc_type, exc_value, exc_tb)
File "E:\Python\Python35-32\lib\site-packages\sqlalchemy\util\compat.py", line 187, in reraise
raise value
File "E:\Python\Python35-32\lib\site-packages\sqlalchemy\orm\session.py", line 2223, in _flush
flush_context.execute()
File "E:\Python\Python35-32\lib\site-packages\sqlalchemy\orm\unitofwork.py", line 389, in execute
rec.execute(self)
File "E:\Python\Python35-32\lib\site-packages\sqlalchemy\orm\unitofwork.py", line 548, in execute
uow
File "E:\Python\Python35-32\lib\site-packages\sqlalchemy\orm\persistence.py", line 181, in save_obj
mapper, table, insert)
File "E:\Python\Python35-32\lib\site-packages\sqlalchemy\orm\persistence.py", line 835, in _emit_insert_statements
execute(statement, params)
File "E:\Python\Python35-32\lib\site-packages\sqlalchemy\engine\base.py", line 945, in execute
return meth(self, multiparams, params)
File "E:\Python\Python35-32\lib\site-packages\sqlalchemy\sql\elements.py", line 263, in _execute_on_connection
return connection._execute_clauseelement(self, multiparams, params)
File "E:\Python\Python35-32\lib\site-packages\sqlalchemy\engine\base.py", line 1053, in _execute_clauseelement
compiled_sql, distilled_params
File "E:\Python\Python35-32\lib\site-packages\sqlalchemy\engine\base.py", line 1189, in _execute_context
context)
File "E:\Python\Python35-32\lib\site-packages\sqlalchemy\engine\base.py", line 1393, in _handle_dbapi_exception
exc_info
File "E:\Python\Python35-32\lib\site-packages\sqlalchemy\util\compat.py", line 203, in raise_from_cause
reraise(type(exception), exception, tb=exc_tb, cause=cause)
File "E:\Python\Python35-32\lib\site-packages\sqlalchemy\util\compat.py", line 186, in reraise
raise value.with_traceback(tb)
File "E:\Python\Python35-32\lib\site-packages\sqlalchemy\engine\base.py", line 1182, in _execute_context
context)
File "E:\Python\Python35-32\lib\site-packages\sqlalchemy\engine\default.py", line 470, in do_execute
cursor.execute(statement, parameters)
File "E:\Python\Python35-32\lib\site-packages\pymysql\cursors.py", line 166, in execute
result = self._query(query)
File "E:\Python\Python35-32\lib\site-packages\pymysql\cursors.py", line 322, in _query
conn.query(q)
File "E:\Python\Python35-32\lib\site-packages\pymysql\connections.py", line 835, in query
self._affected_rows = self._read_query_result(unbuffered=unbuffered)
File "E:\Python\Python35-32\lib\site-packages\pymysql\connections.py", line 1019, in _read_query_result
result.read()
File "E:\Python\Python35-32\lib\site-packages\pymysql\connections.py", line 1302, in read
first_packet = self.connection._read_packet()
File "E:\Python\Python35-32\lib\site-packages\pymysql\connections.py", line 981, in _read_packet
packet.check_error()
File "E:\Python\Python35-32\lib\site-packages\pymysql\connections.py", line 393, in check_error
err.raise_mysql_exception(self._data)
File "E:\Python\Python35-32\lib\site-packages\pymysql\err.py", line 107, in raise_mysql_exception
raise errorclass(errno, errval)
sqlalchemy.exc.IntegrityError: (pymysql.err.IntegrityError) (1062, "Duplicate entry '123' for key 'ix_users_username'") [SQL: 'INSERT INTO users (username, password) VALUES (%(username)s, %(password)s)'] [parameters: {'username': '123', 'password': '123'}]
127.0.0.1 - - [21/Feb/2017 09:17:42] "POST /register HTTP/1.1" 200 -
