JPA 本机查询。不能 select 特定列

Question

我正在开发一个 Spring 启动项目，使用 JPA 连接到我的数据库。我想对 select 某些特定字段进行本机查询，但它不允许我这样做。例如，我只想获取客户的 id、firstName、lastName 和 phoneNumber 但它会抛出错误，如

The column name current_access_token was not found in this ResultSet.

这是我在 JPA 存储库中的查询代码，

@Query(value = "SELECT c.id, c.phone_number, c.firstname, c.lastname FROM tbl_customers c JOIN tbl_subscriptions s ON c.id = s.customer_id WHERE s.role = 'member' AND s.deleted_at IS NULL", nativeQuery = true) 
List<Customer> findMemberByRole(String role);

这是我的 Cutomer.java

@Getter
@Setter
@Accessors(chain=true)
@NoArgsConstructor
@AllArgsConstructor
@ToString
@Entity
@Table(name = "tbl_customers")
public class Customer implements Serializable {
    private static final long serialVersionUID = 1L;
    @Id
    @GeneratedValue(strategy=GenerationType.IDENTITY)
    @Column(unique = true)
    private Long id;
    @Column(nullable = false, name = "phone_number")
    private String phoneNumber;
    private String firstname;
    private String lastname;
    @Column(name = "current_access_token")
    private String currentAccessToken;
    @Column(name = "consent_accepted")
    private Boolean consentAccepted;
    ...
    ...
}

如何避免或忽略不需要的列？非常感谢您的帮助。

Answer 1

如果你真的想return只有来自客户table的4列，那么你想在这里使用的签名是List<Object[]>:

@Query(value = "SELECT c.id, c.phone_number, c.firstname, c.lastname FROM tbl_customers c JOIN tbl_subscriptions s ON c.id = s.customer_id WHERE s.role = 'member' AND s.deleted_at IS NULL", nativeQuery = true) 
List<Object[]> findMemberByRole(String role);

然后，当访问你的结果集时，你会使用类似的东西：

List<Object[]> resultSet = findMemberByRole("admin");
for (Object[] rs : resultSet) {
    Long id = (Long) rs[0];
    String phoneNumber = (String) rs[1];
    String firstName = (String) rs[2];
    String lastName = (String) rs[3];
}

JPA 本机查询。不能 select 特定列

JPA Native Query. Cannot select specific columns

spring

spring-data-jpa

spring-boot