session.flush 与 transaction.commit

本文详细介绍了Hibernate中Session的Flush机制及其工作原理。探讨了在不同情况下Flush如何被触发,特别是在事务管理和查询过程中Flush行为的变化。
hibernate 的 session.flush()立即向数据库发送sql语句,如果在某个事务中则等到commit之后,一起提交执行。如果在事务中修改了持久化对象,且session的自动flush级别设置为了auto,则在同一事务中如果使用get方法,自动执行flush操作,在一般的hql查询语句中则不会自动flush操作。
代码报错: await db_session.commit() # 单条提交确保实时性 File "D:\work\n_work\dss-rag-venv\Lib\site-packages\sqlalchemy\ext\asyncio\session.py", line 1014, in commit await greenlet_spawn(self.sync_session.commit) File "D:\work\n_work\dss-rag-venv\Lib\site-packages\sqlalchemy\util\_concurrency_py3k.py", line 203, in greenlet_spawn result = context.switch(value) ^^^^^^^^^^^^^^^^^^^^^ File "D:\work\n_work\dss-rag-venv\Lib\site-packages\sqlalchemy\orm\session.py", line 2032, in commit trans.commit(_to_root=True) File "<string>", line 2, in commit File "D:\work\n_work\dss-rag-venv\Lib\site-packages\sqlalchemy\orm\state_changes.py", line 139, in _go ret_value = fn(self, *arg, **kw) ^^^^^^^^^^^^^^^^^^^^ File "D:\work\n_work\dss-rag-venv\Lib\site-packages\sqlalchemy\orm\session.py", line 1313, in commit self._prepare_impl() File "<string>", line 2, in _prepare_impl File "D:\work\n_work\dss-rag-venv\Lib\site-packages\sqlalchemy\orm\state_changes.py", line 139, in _go ret_value = fn(self, *arg, **kw) ^^^^^^^^^^^^^^^^^^^^ File "D:\work\n_work\dss-rag-venv\Lib\site-packages\sqlalchemy\orm\session.py", line 1288, in _prepare_impl self.session.flush() File "D:\work\n_work\dss-rag-venv\Lib\site-packages\sqlalchemy\orm\session.py", line 4345, in flush self._flush(objects) File "D:\work\n_work\dss-rag-venv\Lib\site-packages\sqlalchemy\orm\session.py", line 4480, in _flush with util.safe_reraise(): ^^^^^^^^^^^^^^^^^^^ File "D:\work\n_work\dss-rag-venv\Lib\site-packages\sqlalchemy\util\langhelpers.py", line 228, in __exit__ raise value.with_traceback(traceback) File "D:\work\n_work\dss-rag-venv\Lib\site-packages\sqlalchemy\orm\session.py", line 4481, in _flush transaction.rollback(_capture_exception=True) File "<string>", line 2, in rollback File "D:\work\n_work\dss-rag-venv\Lib\site-packages\sqlalchemy\orm\state_changes.py", line 103, in _go self._raise_for_prerequisite_state(fn.__name__, current_state) File "D:\work\n_work\dss-rag-venv\Lib\site-packages\sqlalchemy\orm\session.py", line 988, in _raise_for_prerequisite_state raise sa_exc.ResourceClosedError("This transaction is close
08-09
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