如何使用JpaRepository和嵌套的对象列表进行搜索？

Question

描述

person.java

@Data
@Entity
public class Person {

@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
private String id;

@NotEmpty
@Size(min = 2)
private String name;

@NotEmpty
@Size(min = 2)
private String surname;

@ElementCollection(targetClass = java.util.ArrayList.class, fetch = FetchType.EAGER)
private List<Qualification> qualifications = new ArrayList<>();

}

personrepository.java

@Repository
public interface PersonRepository extends JpaRepository<Person, String> {
}

qualification.java

@Data
@AllArgsConstructor
public class Qualification implements Serializable {

    @Id @GeneratedValue
    private String id;
    private String name;
    private String experienceInMonths;
}

Answer 1

首先，将experienceinmonths从string更改为int（否则不能将字符串与数字进行比较）。然后你可以试着用这个‘香肠':

List<Person> findByQualifications_experienceInMonthsGreaterThanAndQualifications_experienceInMonthsLessThanAndName(int experienceGreater, int experienceLess, String name);

或者您可以尝试使用这个非常好的方法：

@Query("select p from Person p left join p.qualifications q where q.experienceInMonths > ?1 and q.experienceInMonths < ?2 and q.name = ?3")
List<Person> findByQualification(int experienceGreater, int experienceLess, String name);