How to use MySql Database queries in Spring Boot?

Question

I am creating an API by using spring boot. In this project, I used spring web, JPA, jstl and MySql as dependencies of the API. In this project, I have created a Controller,

Answer 1

You can create an object by using the columns as parameters for a constructor.

I'll give you an example of my own with a custom DTO I made:

@Query("SELECT new org.twinnation.site.dto.TitleAndDescriptionAndId(a.title, a.description, a.id) "
      + "FROM Article a")
List getAllArticlesWithoutContent();

Where the DTO TitleAndDescriptionAndId is the following:

public class TitleAndDescriptionAndId {

    private String title;
    private String description;
    private Long id;


    public TitleAndDescriptionAndId(String title, String description, Long id) {
        this.title = title;
        this.description = description;
        this.id = id;
    }

    // ...

}