Spring Boot JPA uses and sets multiple primary keys

1. The use of spring data jpa

The following two articles are recommended

Using spring data jpa using
spring-boot-jpa

Second, set multiple primary keys (composite primary keys)

Two methods are described below:

The first: @IdClass to set multiple primary keys

1. First write a class that contains the primary key

@Data
public class PrimaryKey implements Serializable {

    private Integer id;

    private Integer userId;
}

2. In the Entity class, use it as follows

@Data
@Entity
@Table(name = "xx")
@IdClass(PrimaryKey.class)
@EqualsAndHashCode(callSuper = true)
@DynamicUpdate
public class MyEntity{

    /**
     * @description 主键
     */
    @Id
    @Column(name = "id", nullable = false)
    private Integer id;

    /**
     * @description 主键
     */
    @Id
    @Column(name = "user_id", nullable = false)
    private Integer userId;

}

refer to:

Spring Boot JPA composite primary key only queries part of the primary key

The second: @Embeddable and @EmbeddedId to set the joint primary key

Recommend this article: Two properties define a primary key: Union primary key in JPA