我们有时在进行开发过程中,使用jpa的@Query注解去选择多张表然后返回一个DTO对象,这个时候我们需要特殊处理一下,因为默认情况下,你的jpa代码是不认DTO对象的。

参考文章:https://smarterco.de/spring-data-jpa-query-result-to-dto/

* entity实体 @Entity @Getter @Setter @Builder @ToString @AllArgsConstructor
@NoArgsConstructor public class OrderInfo extends EntityBase { @Id
@GeneratedValue private int id; private int userId; private String userName;
private double total; private String shippingName; private String
shippingAddress; private Date orderTime; } @Entity @Getter @Setter @Builder
@ToString @AllArgsConstructor @NoArgsConstructor public class OrderItem extends
EntityBase { @Id @GeneratedValue private int id; private int orderId; private
int productId; private String productName; private int count; private double
salePrice; } /** * DTO对象 */ @Getter @Setter @Builder @ToString
@AllArgsConstructor @NoArgsConstructor public class OrderList { public int id;
private int userId; private String userName; private int productId; private
String productName; private int count; private double salePrice; }
* repository方法 @Query("select new
com.lind.microservice.productCenter.dto.OrderList" + "(
o.id,o.userId,o.userName,oi.productId,oi.productName,oi.count,oi.salePrice) " +
" from OrderInfo o " + " join OrderItem oi on o.id=oi.orderId") List<OrderList>
getOrderInfos();
* 结果 [ { "id": 5, "userId": 3, "userName": "lind", "productId": 4,
"productName": "足球", "count": 1, "salePrice": 99 } ]

友情链接
KaDraw流程图
API参考文档
OK工具箱
云服务器优惠
阿里云优惠券
腾讯云优惠券
华为云优惠券
站点信息
问题反馈
邮箱:ixiaoyang8@qq.com
QQ群:637538335
关注微信