python sqlalchemy label usage
Question:
I know I can use the label method for alias, but I can’t figure out how to use the labeled element later in the query – something like the following:
session.query(Foo.bar.label("foobar")).filter(foobar > 10).all()
Of course, this doesn’t work since there is no variable called foobar. How could this be accomplished?
(The over simplified example was just for easy comprehension…)
Answers:
Just put foobar in quotes. It’ll work for order_by like this:
session.query(Foo.bar.label("foobar")).order_by('foobar').all()
For filter you can use raw sql conditions:
session.query(Foo.bar.label("foobar")).filter("foobar > 10").all()
Offhand, I believe you can use the labeled column itself as an expression:
foobar = Foo.bar.label("foobar")
session.query(foobar).filter(foobar > 10).all()
# When you use the SQLAlchemy Core interface you may apply text()
from sqlalchemy import text
stmt = select(Foo.c.bar.label("foobar"))
stmt = stmt.where(text("foobar > 10"))
I know I can use the label method for alias, but I can’t figure out how to use the labeled element later in the query – something like the following:
session.query(Foo.bar.label("foobar")).filter(foobar > 10).all()
Of course, this doesn’t work since there is no variable called foobar. How could this be accomplished?
(The over simplified example was just for easy comprehension…)
Just put foobar in quotes. It’ll work for order_by like this:
session.query(Foo.bar.label("foobar")).order_by('foobar').all()
For filter you can use raw sql conditions:
session.query(Foo.bar.label("foobar")).filter("foobar > 10").all()
Offhand, I believe you can use the labeled column itself as an expression:
foobar = Foo.bar.label("foobar")
session.query(foobar).filter(foobar > 10).all()
# When you use the SQLAlchemy Core interface you may apply text()
from sqlalchemy import text
stmt = select(Foo.c.bar.label("foobar"))
stmt = stmt.where(text("foobar > 10"))