Question

Student – Course : OneToMany

JPQL :

select Student from Student student, Course course where
student.name=:STUDENTNAME and (course.courseName=:COURSENAME or
course.courseDuration=courseDuration)

Let us suppose one student might have 10 courses i want to retrieve only two records having Student – Courses(2).

CriteriaBuilder criteriaBuilder = entityManager.getCriteriaBuilder();
CriteriaQuery<Student> criteriaQuery = criteriaBuilder.createQuery(Student.class);
Root<Student> studentRoot = criteriaQuery.from(Student.class);
studentRoot.fetch("courses", JoinType.LEFT);
Predicate condition = criteriaBuilder.equal(studentRoot.get("studentName"), "someName");
//how to add course condition here.
criteriaQuery.where(condition);

Answer 1

There is no equivalent of JPA QL “JOIN FETCH” in Criteria API.

JOIN FETCH uses EAGER fetch irrespective of the fetch type specified in the model annotation.

If you are using criteria api, you can call the getter method of child in the dao,so that it gets loaded.