小编pan*_*tus的帖子

在 Spring Boot 应用程序中，我有一个复合 id 定义如下的类：

@Embeddable
public class StatisticId implements Serializable {

    private static final long serialVersionUID = 1L;

    @Column(length = 255, nullable = false)
    private String shortName;

    @Enumerated(EnumType.STRING)
    @Column(length = 32, nullable = false)
    private Month month;

    @Column(nullable = false)
    private int year;

    // getters, setters, equals, hashCode, toString
}

（简化的）类定义是：

@Entity
public class Statistic implements Serializable {

    private static final long serialVersionUID = 1L;

    private BigDecimal sales;

    @EmbeddedId
    private StatisticId id;

    // getters, setters, toString
}

我想对这门课进行投影： …