明确指定＆＃34; FROM＆＃34;表

Question

我目前有以下查询：

query = self.session.query(Student, School).join(
    Person.student, aliased=True).join(
    Student.school, aliased=True).filter(
    Person.id == 1)

编译到这个SQL。

SELECT student.id AS student_id, student.school_id AS student_school_id, student.person_id AS student_person_id, school.id AS school_id, school.name AS school_name 
FROM student, school, person JOIN student AS student_1 ON person.id = student_1.person_id JOIN school AS school_1 ON school_1.id = student_1.school_id 
WHERE person.id = :id_1

我希望查询保持原样，但我希望from语句完全来自Person模型。像

这样的东西

SELECT * FROM person JOIN ... WHERE person.id = :id_1

我认为aliased kwarg搞砸了条件。删除aliased kwarg会修复行为，但我需要使用别名kwarg来处理特殊用例。如何从＆＃34; FROM＆＃34;中删除student和school表格。言。

Answer 1

aliased的{​​{1}}参数使用匿名别名，这意味着您传递给.join的{​​{1}}和Student是表格的不同“实例”。

School

在这里，您可以看到session.query在加入关系时可以使用哪个别名。