Other SQL Clauses
SQLAlchemy ORM also exposes support for other clauses in SQL, such as ORDER BY, GROUP BY, LIMIT, and OFFSET. All of these are supported by this connector:
ORDER BY
The following example sorts by a specified column using the session object's query() method:rs = session.query(ItemListing).order_by(ItemListing.MinimumBestOfferPrice) for instance in rs: print("ItemId: ", instance.ItemId) print("HitCount: ", instance.HitCount) print("Title: ", instance.Title) print("---------")
You can also use the session object's execute() method perform an ORDER BY. For example:
rs = session.execute(ItemListing_table.select().order_by(ItemListing_table.c.MinimumBestOfferPrice)) for instance in rs:
GROUP BY
The following example uses the session object's query() method to group records with a specified column:rs = session.query(func.count(ItemListing.ItemId).label("CustomCount"), ItemListing.HitCount).group_by(ItemListing.HitCount) for instance in rs: print("Count: ", instance.CustomCount) print("HitCount: ", instance.HitCount) print("---------")
You can also use the session object's execute() method to perform a GROUP BY:
rs = session.execute(ItemListing_table.select().with_only_columns([func.count(ItemListing_table.c.ItemId).label("CustomCount"), ItemListing_table.c.HitCount]).group_by(ItemListing_table.c.HitCount)) for instance in rs:
LIMIT and OFFSET
The following example uses the session object's query() method to skip the first 100 records and fetch the following 25:rs = session.query(ItemListing).limit(25).offset(100) for instance in rs: print("ItemId: ", instance.ItemId) print("HitCount: ", instance.HitCount) print("Title: ", instance.Title) print("---------")
You can also use the session object's execute() method to set a LIMIT or OFFSET:
rs = session.execute(ItemListing_table.select().limit(25).offset(100)) for instance in rs: