在 SQLAlchemy 中重新格式化查詢結果

Question

SQL 查詢不僅允許獲得一堆列作為結果，而且允許同時將其形成為有用的東西。 例如：

select Person.name + " likes " + Food.name as all_i_want_as_a_result from Food, Person where Food.id == Person.favourite_food

但是我怎么能用 SQLAlchemy 做同樣的事情呢？ 例如：

query = db.session.query(Food, Person).filter(Food.id == Person.favourite_food) <-- how do I modify this line?
for row in db.session.execute(query)
    print row

預期輸出將是：

Alice likes icecream
Bob likes pizza

Answer 1

您可以在.query()查詢任意內容：

query = db.session.query(Person.name.concat(" likes ").concat(Food.name).label("all_i_want_as_a_result"))
                  .filter(Food.id == Person.favourite_food)
print query

這打印：

SELECT "Person".name || ? || "Food".name AS all_i_want_as_a_result 
FROM "Person", "Food" 
WHERE "Food".id = "Person".favourite_food