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我有两个类:Furniture
和Painting
。那些延伸Item
。扩展对象不存在于数据库中
项目具有下面的代码:
@Entity
public class Item implements Comparable, Serializable {
@Id @GeneratedValue(strategy= GenerationType.AUTO)
private Long id;
@ManyToOne
private User seller;
@Embedded
@AttributeOverrides({
@AttributeOverride(name = "description",
column = @Column(name = "c_description"))})
private Category category;
private String description;
public Item() {
}
public Item(User seller, Category category, String description) {
this.seller = seller;
this.category = category;
this.description = description;
this.seller.addItem(this);
}
绘画具有下面的代码:
@Entity
public class Painting extends Item {
private String title;
private String painter;
public Painting() {
}
public Painting(String title, String painter, User seller, Category category, String description) {
super(seller, category, description);
this.title = title;
this.painter = painter;
}
家具具有下面的代码:
@Entity
public class Furniture extends Item {
private String material;
public Furniture() {
}
public Furniture(String material, User seller, Category category, String description) {
super(seller, category, description);
this.material = material;
}
之前,我尝试了一些代码,坚持Item
对象。这工作得很好。 现在我试图坚持一个Painting
对象,坚持通过实体管理器。 我得到以下错误:
Object: [email protected] is not a known entity type.
好像我忘了什么事或做错了什么事,可能是在Painting
-class。会是什么呢?
你是如何将你的表映射到实体类的? eclipse链接我使用@Table注释 – vels4j
我不太明白你的意思。这是我有这个问题的所有代码,所以也许我错过了什么? – Joetjah