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pythonormsqlalchemy
supreme Pooba
supreme Pooba

Reputation: 988

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?

Upvotes: 76

Views: 79689

Answers (4)

Angel
Angel

Reputation: 2865

New syntax (1.4 version and above)

from sqlalchemy import delete

statement = delete(User).where(User.id.in_(...))
session.execute(statement)

https://docs.sqlalchemy.org/en/14/core/dml.html?highlight=delete

Upvotes: 22

Ojus sangoi
Ojus sangoi

Reputation: 716

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)

Upvotes: 32

dizzyf
dizzyf

Reputation: 3593

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

Upvotes: 82

Mickael
Mickael

Reputation: 879

To complete dizzy's answer:

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

Upvotes: 50

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