带参数属性的Spring数据JPA查询

Question

声明使用输入参数属性作为查询参数的Spring数据JPA查询的最简单方法是什么？

例如,假设我有一个实体类:

public class Person {
    @Id
    private long id;

    @Column
    private String forename;

    @Column
    private String surname;
}

和另一课:

public class Name {
    private String forename;
    private String surname;

    [constructor and getters]
}

...然后我想编写一个Spring数据存储库,如下所示:

public interface PersonRepository extends CrudRepository<Person, Long> {
    @Query("select p from Person p where p.forename = ?1.forename and p.surname = ?1.surname")
    findByName(Name name);
}

...但是Spring数据/ JPA不喜欢我在?1参数上指定属性名称.

什么是最好的选择？}

Answer 1

此链接将帮助您:支持SpEL表达式的Spring Data JPA M1.类似的例子是:

@Query("select u from User u where u.firstname = :#{#customer.firstname}")
List<User> findUsersByCustomersFirstname(@Param("customer") Customer customer);

https://spring.io/blog/2014/07/15/spel-support-in-spring-data-jpa-query-definitions

Answer 2

使用签名定义查询方法,如下所示.

@Query(select p from Person p where p.forename = :forename and p.surname = :surname)
User findByForenameAndSurname(@Param("surname") String lastname,
                             @Param("forename") String firstname);
}

有关更多详细信息,请查看Spring Data JPA参考

Answer 3

你想要的是不可能的.您必须创建两个参数,并分别绑定它们:

select p from Person p where p.forename = :forename and p.surname = :surname
...
query.setParameter("forename", name.getForename());
query.setParameter("surname", name.getSurname());

Answer 4

你可以尝试这样的事情:

public interface PersonRepository extends CrudRepository<Person, Long> {
       @Query("select p from Person AS p"
       + " ,Name AS n"  
       + " where p.forename = n.forename "
       + " and p.surname = n.surname"
       + " and n = :name")
       Set<Person>findByName(@Param("name") Name name);
    }

Answer 5

您也可以使用接口默认方法解决它：

 @Query(select p from Person p where p.forename = :forename and p.surname = :surname)
User findByForenameAndSurname(@Param("surname") String lastname,
                         @Param("forename") String firstname);

default User findByName(Name name) {
  return findByForenameAndSurname(name.getLastname(), name.getFirstname());
}

当然，您仍然可以公开可见的实际存储库功能......