Debugging 如何记录sqlalchemy中返回的SQL语句和行以帮助调试？

如何配置

sqlalchemy

来记录它向数据库服务器发出的SQL语句，并记录从这些语句返回的行？这对于调试非常有用。

选项1：将

sqlalchemy.engine

记录器日志级别设置为

logging.INFO

或

logging.DEBUG

： e、 g

参考：

选项2：调用

sqlalchemy.create_engine（）

：

e、 g

*sqlalchemy.创建引擎（*args，**kwargs）
…
echo=False–如果为True，引擎将把所有语句及其参数列表的repr（）记录到引擎记录器中，该记录器默认为sys.stdout。可以随时修改引擎的echo属性以打开和关闭日志记录。如果设置为字符串“debug”，结果行也将打印到标准输出

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似乎人们在文档中很难找到这一点，但您也可以完全自定义日志运行方式。谢谢@zzzeek！我现在在答案中加上了这一点。

>>> import logging
>>> logging.basicConfig()
>>> logger = logging.getLogger('sqlalchemy.engine')
>>> logger.setLevel(logging.DEBUG)
>>> session.query(User).all()
2015-01-02 11:54:25,854 INFO sqlalchemy.engine.base.Engine BEGIN (implicit)
2015-01-02 11:54:25,856 INFO sqlalchemy.engine.base.Engine SELECT users.id AS users_id, users.name AS users_name
FROM users
2015-01-02 11:54:25,857 INFO sqlalchemy.engine.base.Engine {}
2015-01-02 11:54:25,858 DEBUG sqlalchemy.engine.base.Engine Col ('users_id', 'users_name')
2015-01-02 11:54:25,860 DEBUG sqlalchemy.engine.base.Engine Row (1, u'Alice')
2015-01-02 11:54:25,860 DEBUG sqlalchemy.engine.base.Engine Row (2, u'Bob')

>>> from sqlalchemy import create_engine
>>> from sqlalchemy.orm import sessionmaker
>>> engine = create_engine('postgres://postgres_user:my_password@localhost/my_db',
...                        echo="debug")
>>> Session = sessionmaker(bind=engine)
>>> session = Session()
>>> users = session.query(User).all()
2015-01-02 11:54:25,854 INFO sqlalchemy.engine.base.Engine BEGIN (implicit)
2015-01-02 11:54:25,856 INFO sqlalchemy.engine.base.Engine SELECT users.id AS users_id, users.name AS users_name
FROM users
2015-01-02 11:54:25,857 INFO sqlalchemy.engine.base.Engine {}
2015-01-02 11:54:25,858 DEBUG sqlalchemy.engine.base.Engine Col ('users_id', 'users_name')
2015-01-02 11:54:25,860 DEBUG sqlalchemy.engine.base.Engine Row (1, u'Alice')
2015-01-02 11:54:25,860 DEBUG sqlalchemy.engine.base.Engine Row (2, u'Bob')