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(PullRequests).order_by(PullRequests.AnnualRevenue)
for instance in rs:
print("Id: ", instance.Id)
print("Title: ", instance.Title)
print("State: ", instance.State)
print("---------")
You can also use the session object's execute() method perform an ORDER BY. For example:
rs = session.execute(PullRequests_table.select().order_by(PullRequests_table.c.AnnualRevenue)) 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(PullRequests.Id).label("CustomCount"), PullRequests.Title).group_by(PullRequests.Title)
for instance in rs:
print("Count: ", instance.CustomCount)
print("Title: ", instance.Title)
print("---------")
You can also use the session object's execute() method to perform a GROUP BY:
rs = session.execute(PullRequests_table.select().with_only_columns([func.count(PullRequests_table.c.Id).label("CustomCount"), PullRequests_table.c.Title]).group_by(PullRequests_table.c.Title))
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(PullRequests).limit(25).offset(100)
for instance in rs:
print("Id: ", instance.Id)
print("Title: ", instance.Title)
print("State: ", instance.State)
print("---------")
You can also use the session object's execute() method to set a LIMIT or OFFSET:
rs = session.execute(PullRequests_table.select().limit(25).offset(100)) for instance in rs: