loop但是,如果第一次生成的label不是唯一的,并且save()在第二次(或以后)迭代中调用,则会出现此错误:
InvalidRequestError: This Session'stransactionhasbeenrolledbackdue to a previousexception during flush.To begin a new tra
", line 719, in commit File "/usr/local/lib/python2.7/dist-packages/SQLAlchemy_rollback_exception
sqlalchemy.exc.InvalidRequestError: This Session'stransactionhas
sqlalchemy.exc.InvalidRequestError: This Session'stransactionhasbeenrolledback by a nested rollbackTo begin a new transaction, issue Session.rollback() first.
我想知道问题是什么,为什么会发生,以及我如何解决它。
assert len(results.all()) == 1E sqlalchemy.exc.PendingRollbackError: This Session'stransactionhasbeenrolledbackdue to a previousexception during flush.To begin a new tr
一切正常,但是(也许,也许不是)当我升级我的数据库时,我得到了以下错误消息 sqlalchemy.exc.InvalidRequestError: This Session'stransactionhasbeenrolledbackdue to a
previousexception during flush.To begin a new transaction with t