[英]Hibernate criteria query multiple criteria
In my current project I've faced a problem of getting entities with hibernate criteria query. 在我目前的项目中,我遇到了使用hibernate条件查询获取实体的问题。 I have the following entities:
我有以下实体:
Now, I want to get all assignments relative to the professor, ie all assignments Professor assigned to his students. 现在,我希望获得与教授相关的所有作业,即教授分配给他的学生的所有作业。
This query shows what I want to implement in criteria query. 此查询显示我要在条件查询中实现的内容。
select * from Assigment p, Student a, Professor c where p.studentid = a.id and a.proffid = c.id and c.id = 2411;
How can I implement this query using hibernate criteria API? 如何使用hibernate criteria API实现此查询?
suppose your tables like that: 假设你的表是这样的:
@Entity
public class Professor{
K id;
List<Student> students;
}
@Entity
public class Student{
K profid;
List<Assignments> assignments;
}
@Entity
public class Assignments{
K studentid;
}
simple sample by using alias: 使用别名的简单示例:
Criteria criteria = currentSession.createCriteria(Professor.class, "professor");
criteria.createAlias("professor.students", "student");
criteria.createAlias("student.assigments", "assigment");
criteria.add(Restrictions.eqProperty("professor.id", "student.profid"));
criteria.add(Restrictions.eqProperty("assigment.studentid", "student.profid"));
criteria.add(Restrictions.eq("id", 2411));
return criteria.list();
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