如何在sqlalchemy会话查询中加入联接? [英] how to do a join in sqlalchemy session query?

问题描述

我需要在sqlalchemy中找到此查询的等效项.

I need to find the equivalent of this query in sqlalchemy.

SELECT u.user_id, u.user_name, c.country FROM
table_user u , table_country c WHERE u.user_email = '[e-mail]'

我尝试了以下代码:

session.query(User).join(Country.country).filter(User.user_email == '[e-mail]').first()

这给了我下面的错误:

  AttributeError: 'ColumnProperty' object has no attribute 'mapper'

谁能举一个表映射到新类对象的联接查询示例?

can anyone give an example of join query with tables mapped to new class objects ?

推荐答案

尝试此操作，假设您的用户映射器与配置的国家/地区有关系.

Try this, assuming your User mapper has a relationship to Country configured.

user, country = session.query(User, Country.country).join(Country).filter(User.user_email == '[e-mail]').first()

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