錯誤:sqlalchemy.exc.IntegrityError: (pymysql.err.IntegrityError)
先晒程式碼
from flask import Flask from flask_sqlalchemy import SQLAlchemy import pymysql app=Flask(__name__) @app.route('/') def hello_world(): return '11hello_world' app.config['SECRET_KEY']='hard to guess' app.config['SQLALCHEMY_DATABASE_URI']='mysql+pymysql://root:[email protected]:3306/news_title' app.config['SQLALCHEMY_COMMIT_ON_TEARDOWN']=True app.config['SQLALCHEMY_TRACK_MODIFICATIONS']=True db=SQLAlchemy(app) class Title(db.Model): __tablename__='title' id=db.Column(db.Integer,primary_key=True) name=db.Column(db.String(256),unique=True) def __ref__(self): return '<Title{}>'.format(self.name) db.create_all() title_one=Title(name='ddddddd') title_two=Title(name='aaaaaa') title_three=Title(name='aaaaaa') db.session.add_all([title_one,title_two,title_three]) db.session.commit() if __name__=='__main__': app.run()
執行結果顯示:
JudydeMacBook-Air:python judy$ python o1.py
Traceback (most recent call last):
File "/Users/judy/anaconda/lib/python3.6/site-packages/sqlalchemy/engine/base.py", line 1182, in _execute_context
context)
File "/Users/judy/anaconda/lib/python3.6/site-packages/sqlalchemy/engine/default.py", line 470, in do_execute
cursor.execute(statement, parameters)
File "/Users/judy/anaconda/lib/python3.6/site-packages/pymysql/cursors.py", line 166, in execute
result = self._query(query)
File "/Users/judy/anaconda/lib/python3.6/site-packages/pymysql/cursors.py", line 322, in _query
conn.query(q)
File "/Users/judy/anaconda/lib/python3.6/site-packages/pymysql/connections.py", line 835, in query
self._affected_rows = self._read_query_result(unbuffered=unbuffered)
File "/Users/judy/anaconda/lib/python3.6/site-packages/pymysql/connections.py", line 1019, in _read_query_result
result.read()
File "/Users/judy/anaconda/lib/python3.6/site-packages/pymysql/connections.py", line 1302, in read
first_packet = self.connection._read_packet()
File "/Users/judy/anaconda/lib/python3.6/site-packages/pymysql/connections.py", line 981, in _read_packet
packet.check_error()
File "/Users/judy/anaconda/lib/python3.6/site-packages/pymysql/connections.py", line 393, in check_error
err.raise_mysql_exception(self._data)
File "/Users/judy/anaconda/lib/python3.6/site-packages/pymysql/err.py", line 107, in raise_mysql_exception
raise errorclass(errno, errval)
pymysql.err.IntegrityError: (1062, "Duplicate entry 'aaaaaa' for key 'name'")
The above exception was the direct cause of the following exception:
Traceback (most recent call last):
File "o1.py", line 26, in <module>
db.session.commit()
File "/Users/judy/anaconda/lib/python3.6/site-packages/sqlalchemy/orm/scoping.py", line 157, in do
return getattr(self.registry(), name)(*args, **kwargs)
File "/Users/judy/anaconda/lib/python3.6/site-packages/sqlalchemy/orm/session.py", line 874, in commit
self.transaction.commit()
File "/Users/judy/anaconda/lib/python3.6/site-packages/sqlalchemy/orm/session.py", line 461, in commit
self._prepare_impl()
File "/Users/judy/anaconda/lib/python3.6/site-packages/sqlalchemy/orm/session.py", line 441, in _prepare_impl
self.session.flush()
File "/Users/judy/anaconda/lib/python3.6/site-packages/sqlalchemy/orm/session.py", line 2139, in flush
self._flush(objects)
File "/Users/judy/anaconda/lib/python3.6/site-packages/sqlalchemy/orm/session.py", line 2259, in _flush
transaction.rollback(_capture_exception=True)
File "/Users/judy/anaconda/lib/python3.6/site-packages/sqlalchemy/util/langhelpers.py", line 60, in __exit__
compat.reraise(exc_type, exc_value, exc_tb)
File "/Users/judy/anaconda/lib/python3.6/site-packages/sqlalchemy/util/compat.py", line 187, in reraise
raise value
File "/Users/judy/anaconda/lib/python3.6/site-packages/sqlalchemy/orm/session.py", line 2223, in _flush
flush_context.execute()
File "/Users/judy/anaconda/lib/python3.6/site-packages/sqlalchemy/orm/unitofwork.py", line 389, in execute
rec.execute(self)
File "/Users/judy/anaconda/lib/python3.6/site-packages/sqlalchemy/orm/unitofwork.py", line 548, in execute
uow
File "/Users/judy/anaconda/lib/python3.6/site-packages/sqlalchemy/orm/persistence.py", line 181, in save_obj
mapper, table, insert)
File "/Users/judy/anaconda/lib/python3.6/site-packages/sqlalchemy/orm/persistence.py", line 835, in _emit_insert_statements
execute(statement, params)
File "/Users/judy/anaconda/lib/python3.6/site-packages/sqlalchemy/engine/base.py", line 945, in execute
return meth(self, multiparams, params)
File "/Users/judy/anaconda/lib/python3.6/site-packages/sqlalchemy/sql/elements.py", line 263, in _execute_on_connection
return connection._execute_clauseelement(self, multiparams, params)
File "/Users/judy/anaconda/lib/python3.6/site-packages/sqlalchemy/engine/base.py", line 1053, in _execute_clauseelement
compiled_sql, distilled_params
File "/Users/judy/anaconda/lib/python3.6/site-packages/sqlalchemy/engine/base.py", line 1189, in _execute_context
context)
File "/Users/judy/anaconda/lib/python3.6/site-packages/sqlalchemy/engine/base.py", line 1393, in _handle_dbapi_exception
exc_info
File "/Users/judy/anaconda/lib/python3.6/site-packages/sqlalchemy/util/compat.py", line 203, in raise_from_cause
reraise(type(exception), exception, tb=exc_tb, cause=cause)
File "/Users/judy/anaconda/lib/python3.6/site-packages/sqlalchemy/util/compat.py", line 186, in reraise
raise value.with_traceback(tb)
File "/Users/judy/anaconda/lib/python3.6/site-packages/sqlalchemy/engine/base.py", line 1182, in _execute_context
context)
File "/Users/judy/anaconda/lib/python3.6/site-packages/sqlalchemy/engine/default.py", line 470, in do_execute
cursor.execute(statement, parameters)
File "/Users/judy/anaconda/lib/python3.6/site-packages/pymysql/cursors.py", line 166, in execute
result = self._query(query)
File "/Users/judy/anaconda/lib/python3.6/site-packages/pymysql/cursors.py", line 322, in _query
conn.query(q)
File "/Users/judy/anaconda/lib/python3.6/site-packages/pymysql/connections.py", line 835, in query
self._affected_rows = self._read_query_result(unbuffered=unbuffered)
File "/Users/judy/anaconda/lib/python3.6/site-packages/pymysql/connections.py", line 1019, in _read_query_result
result.read()
File "/Users/judy/anaconda/lib/python3.6/site-packages/pymysql/connections.py", line 1302, in read
first_packet = self.connection._read_packet()
File "/Users/judy/anaconda/lib/python3.6/site-packages/pymysql/connections.py", line 981, in _read_packet
packet.check_error()
File "/Users/judy/anaconda/lib/python3.6/site-packages/pymysql/connections.py", line 393, in check_error
err.raise_mysql_exception(self._data)
File "/Users/judy/anaconda/lib/python3.6/site-packages/pymysql/err.py", line 107, in raise_mysql_exception
raise errorclass(errno, errval)
sqlalchemy.exc.IntegrityError: (pymysql.err.IntegrityError) (1062, "Duplicate entry 'aaaaaa' for key 'name'") [SQL: 'INSERT INTO title (name) VALUES (%(name)s)'] [parameters: {'name': 'aaaaaa'}]
問題所在:
sqlalchemy.exc.IntegrityError: (pymysql.err.IntegrityError) (1062, "Duplicate entry 'aaaaaa' for key 'name'") [SQL: 'INSERT INTO title (name) VALUES (%(name)s)'] [parameters: {'name': 'aaaaaa'}]
分析問題:
這段話大概的意思是說我的一個鍵值重複了。excuse me?鍵值不能重複?感覺怪怪的。
解決方法:
不管了,我先按照提示來改一下把title_tree 的name改為aaaaa99,執行結果是正確的。
追根溯源
title_one=Title(id=6,name='ddddddd')
title_two=Title(id=5,name='aaaaaa')
title_three=Title(id=4,name='aaaaa999')
name鍵值沒有改,把id鍵值手動遞增。出現的錯誤跟以上一樣。
title_one=Title(id=6,name='ddddddd1')
title_two=Title(id=5,name='aaaaaa1')
title_three=Title(id=4,name='aaaaa9991')
id鍵值沒有改,改了name鍵值,可以了。尼瑪怎麼回事?
name不能重複?不應該啊!難道?
回去看一下程式碼,oh my gold。
name=db.Column(db.String(256),unique=True)
把unique=True寫到name裡邊了。要被自己蠢哭了。
好了,至此問題解決。
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