SpringBoot JPA 在实体中设置多个主键的方法

1. 写一个包含主键类并实例化

2. 在实体类中通过 @IdClass 添加主键类

3. 实体类中使用 @Id 加在需要设置成主键的字段上

@Data
public class UserPrimaryKey implements Serializable {
    private Integer id;
    private Integer userId;
}

@Data
@Entity
@Table(name = "sys_user")
@IdClass(UserPrimaryKey.class)
@EqualsAndHashCode(callSuper = true)
@DynamicUpdate
public class SysUserEntity{
    
    @Id
    @Column(name = "id", nullable = false)
    private Integer id;
    
    @Id
    @Column(name = "user_id", nullable = false)
    private Integer userId;
 
}

如果你不想单独写一个主键类，那你可以这样写

@Data
@Entity
@Table(name = "sys_user")
@IdClass(SysUserEntity.UserPrimaryKey.class)
@EqualsAndHashCode(callSuper = true)
@DynamicUpdate
public class SysUserEntity{
    @Data
    static class UserPrimaryKey implements Serializable {
        private Integer id;
        private Integer userId;
    }
    
    @Id
    @Column(name = "id", nullable = false)
    private Integer id;
    
    @Id
    @Column(name = "user_id", nullable = false)
    private Integer userId;
 
}