sqlalchemy: pool_pre_ping 问题 设想这样一个场景:通过flask启动了一个REST服务,该服务需要访问数据库,且每天被定时请求一次(除此之外无请求)。 按照上一节的讨论,由于两次请求间隔(24小时)超过了关闭阈值(8小时),因此在下一次发送请求时,会报出Lost connection的错误。 解决方案 一个可选的解决方案是,增加w
并且连接超时较低，则建议将SQLALCHEMY_POOL_RECYCLE设置为小于后端超时的值。
获取错误sqlalchemy.exc.ProgrammingError：( invalid copg2.ProgrammingError)无效的dsn: postgres插入中的连接选项"pool_pre_ping“无效查看当前无效对象 select * from dba_objects t where t.status = 'INVALID' order by 1; 编译无效对象： 有两种方式： 1、执行sql查询结果： select 'alter '||object_...
sqlalchemy.exc.ProgrammingError: (psycopg2.ProgrammingError) set_session cannot be used inside a transaction We upgraded the sqlalchemy version to 2.0.38 and psycopg2 to 2.9.10 ok this is your event handler the connection pool is assuming the connection is reset (rolled back) when it's returned...
Describe the bug When using pool_pre_ping=True with MySQL version 8.0.28 and a stale connection, SQLAlchemy raises the following error instead of reconnecting: MySQLdb._exceptions.OperationalError: (4031, 'The client was disconnected by ...