Question

SQL查询不仅允许获取一堆列，而且还可以同时将其形成为usefult。 E.g：

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做同样的事情呢？ E.g：

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

预期输出为：

Alice likes icecream
Bob likes pizza

Answer 1

您可以在.query()：

中查询任意内容

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

打印：

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

在SQLAlchemy中重新格式化查询结果

1 个答案: