Custom Result Set Mapping in Spring Data JPA: Native Query to DTO Mapping Guide
In Spring Data JPA, when working with native queries , the default result mapping may not be sufficient if the query returns a result that doesn't map directly to an entity or needs additional customization. For this purpose, you can use Result Set Mapping to create custom mappings for native query results. Below is a step-by-step guide to implement Result Set Mapping in Spring Data JPA from scratch: 1. Use @SqlResultSetMapping for Custom Mapping You can define a custom result set mapping using the @SqlResultSetMapping annotation. This can be used to map query results to either: Entities Scalar values DTOs 2. Define the Entity and DTO Classes Let's assume you have an Employee entity and want to map a custom result (e.g., only name and salary ) into a DTO. Entity Class @Entity @Table (name = "employees" ) public class Employee { @Id @GeneratedValue (strategy = GenerationType.IDENTITY) private Long id; @Column (name = "name" ) priv...