我有以下基本对象:
/* User class */
import lombok.Data;
import lombok.AllArgsConstructor;
import javax.persistence.Entity;
import javax.persistence.Id
import javax.persistence.GeneratedValue;
import javax.persistence.ManyToOne;
@Data
@Entity
@AllArgsConstructor
public class User {
@Id
@GeneratedValue(strategy=GenerationType.IDENTITY)
private Long id;
private String name;
private String surname;
@ManyToOne
private Address address;
}
/* UserComposite class, used to load partial data from a user */
import lombok.Data;
import lombok.AllArgsConstructor;
@Data
@AllArgsConstructor
public class UserComposite {
private Long userId;
private String name;
private String surname;
}
我的目标是使用UserComposite列表作为输入来更新User列表。这是我的DAO的样子:
/* UserDao class */
import org.springframework.data.jpa.repository.Modifying;
import org.springframework.data.jpa.repository.Query;
import org.springframework.transaction.annotation.Transactional;
public interface UserDao extends JpaRepository<User, Long> {
@Transactional
@Modifying
@Query("update User u set u.name = uc.name , "
+ "u.surname = uc.surname "
+ "where u.id = uc.userId "
+ "and UserComposite uc in (?1)")
void updateUserFromCompositeList(List<UserComposite> userCompositeList);
}
但是,这不起作用。我有时间将输入中的数据与数据库中保存的数据进行匹配,特别是因为UserComposite不是实体。
是否有解决此问题的方法?
无法在一个查询中根据ID用不同的不同值更新多行。
通过ID更新每个用户
for (UserComposite user : List<UserComposite> userCompositeList) {
userDao.updateUser(user.getUserId(), user.getName(), user.getSurname());
}
类似于仓库查询
@Modifying
@Query("UPDATE User u SET u.name = :name, u.surname = :surname WHERE u.id = :userId")
void updateUser(@Param("userId") int userId, @Param("name") String name, @Param("surname") String surname);