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Delete multiple rows in SQLAlchemyGet the books table from the Metadata object initialized while connecting to the database. Pass the delete query to the execute() function and get all the results using fetchall() function. Use a for loop to iterate through the results.
To delete a record by id in Python Flask-SQLAlchemy, we can call the session delete method. to call session. delete to mark obj1 and obj2 to be deleted. And then we call session.
flush() communicates a series of operations to the database (insert, update, delete). The database maintains them as pending operations in a transaction.
Try delete:
models.User.query.delete()
From the docs: Returns the number of rows deleted, excluding any cascades.
DazWorrall's answer is spot on. Here's a variation that might be useful if your code is structured differently than the OP's:
num_rows_deleted = db.session.query(Model).delete()
Also, don't forget that the deletion won't take effect until you commit, as in this snippet:
try:
num_rows_deleted = db.session.query(Model).delete()
db.session.commit()
except:
db.session.rollback()
Delete All Records
#for all records
db.session.query(Model).delete()
db.session.commit()
Deleted Single Row
here DB is the object Flask-SQLAlchemy class. It will delete all records from it and if you want to delete specific records then try filter clause in the query.
ex.
#for specific value
db.session.query(Model).filter(Model.id==123).delete()
db.session.commit()
Delete Single Record by Object
record_obj = db.session.query(Model).filter(Model.id==123).first()
db.session.delete(record_obj)
db.session.commit()
https://flask-sqlalchemy.palletsprojects.com/en/2.x/queries/#deleting-records
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