SQLAlchemy: How do you delete multiple rows without querying
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?
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
To complete dizzy's answer:
delete_q = Report.__table__.delete().where(Report.data == 'test')
db.session.execute(delete_q)
db.session.commit()