SQLAlchemy:如何在不查询的情况下删除多行 [英] SQLAlchemy: How do you delete multiple rows without querying
问题描述
我有一个有数百万行的表.我想通过 in 子句删除多行.但是，使用代码:
I have a table that has millions of rows. I want to delete multiple rows via an in clause. However, using the code:
session.query(Users).filter(Users.id.in_(subquery....)).delete()
上面的代码会查询结果，然后执行删除.我不想那样做.我要速度.
The above code will query the results, and then execute the delete. I don't want to do that. I want speed.
我希望能够执行(是的，我知道 session.execute):Delete from users where id in ()
I want to be able to execute (yes I know about the session.execute):Delete from users where id in ()
问题是:如何使用 ORM 获得两全其美的效果?我可以在不对查询进行硬编码的情况下进行删除吗?
So the Question: How can I get the best of two worlds, using the ORM? Can I do the delete without hard coding the query?
推荐答案
是的！您可以使用关联的 where 子句对表对象调用 delete().
Yep! You can call delete() on the table object with an associated where clause.
像这样:
stmt = Users.__table__.delete().where(Users.id.in_(subquery...))
(然后不要忘记执行语句:engine.execute(stmt))
(and then don't forget to execute the statement: engine.execute(stmt))
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