Question

我尝试使用复合主键插入记录，但在保存新记录时，我收到此消息：

e =（org.springframework.orm.jpa.JpaSystemException） org.springframework.orm.jpa.JpaSystemException：无法设置字段通过反射值[POST_INSERT_INDICATOR]值...

public class AppConfig extends WebMvcConfigurerAdapter {

    ...

    @Bean
    public BuildingService buildingService(){
        return new BuildingService();
    }

    @Override
    public void addFormatters (FormatterRegistry registry) {
        registry.addConverter(new  BuildingIdToBuildingConverter(buildingService()));
    }
}

有没有人见过这样的错误？

Answer 1

要创建复合主键，您可以参考此示例

@Entity
@Table(name="testuserrole")
public class UserRole{
    @EmbeddedId
    private UserRoleId id = new UserRoleId();

    public UserRoleId getId() {
        return id;
    }

    public void setId(UserRoleId id) {
        this.id = id;
    }

    @Transient
    public long getUserId() {
        return id.userId;
    }

    public void setUserId(long userId) {
        id.userId=userId;
    }

    @Transient
    public long getRoleId() {
        return id.roleId;
    }

    public void setRoleId(long roleId) {
        id.roleId=roleId;
    }

}

@Embeddable
class UserRoleId implements Serializable {

    @Column(name = "user_id")
    public long userId;

    @Column(name = "role_id")
    public long roleId;

}

Java持久性复合ID

1 个答案: