说,我有以下实体类:
person.Java
@Entity
public class Person {
@Id
private String name;
private String[] cars;
// Constructor, getters and setters
}
和存储库:
person repository.Java
public interface PersonRepository extends CrudRepository<Person, String> {
// this is unclear!
List<Person> getAllByCars...(String car)
}
是否有一个方法可以返回所有人,其车载数组包含一个给定的车(上面的String参数)?
对我来说,似乎所有受支持的JPA关键字只能处理单个元素,而不能处理数组。
感谢帮助!
理想情况下,您应该将汽车声明为单独的实体
@Entity
public class Person {
@Id
private String name;
private List<Car> cars;
// Constructor, getters and setters
}
如果不是,您应该至少将Array更改为List。更改
private String[] cars;
至
@ElementCollection
private List<String> cars;
然后你必须写这样的查询
@Query("select p from Person p WHERE :car in elements(p.cars)")
List<Person> getAllByCars...(@Param("car") String car)
我猜你当前如何存储汽车信息并建议一个可能的解决方案:
@Entity
public class Car {
@Id
private String name;
@Column
private String person_name;
}
public interface CarRepository extends JpaRepository<Car, String> {
//Result will have all cars with the person_name identifying the Person @Entity
List<Car> findByName(String name);
}