SQLAlchemy: How do you delete multiple rows without querying

问题

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()

The above code will query the results, and then execute the delete. I don't want to do that. I want speed.

I want to be able to execute (yes I know about the session.execute):Delete from users where id in ()

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?

回答1:

Yep! You can call delete() on the table object with an associated where clause.

Something like this:

stmt = Users.__table__.delete().where(Users.id.in_(subquery...))

(and then don't forget to execute the statement: engine.execute(stmt))

source

回答2:

To complete dizzy's answer:

delete_q = Report.__table__.delete().where(Report.data == 'test')
db.session.execute(delete_q)
db.session.commit()

回答3:

The below solution also works, if developers do not want to execute a plain vanilla query.

session.query(Users).filter(Users.id.in_(subquery....)).delete(synchronize_session=False)

来源：https://stackoverflow.com/questions/39773560/sqlalchemy-how-do-you-delete-multiple-rows-without-querying