java - SuperClass 属性上的 JPA 覆盖注释

Question

我有 SuperClass，我在其中定义了我的属性，我想在 SuperClass 属性之一上再应用一个注释。

@MappedSuperclass
public class CartBaseEntity {
private String cartName;

@Column(name = "cart_name")
public String getCartName() {
    return cartName;
 }

public void setCartName(String cartName) {
    this.cartName = cartName;
 }
}

我的子类在下面:

@Entity
@Table(name = "CART2")
public class CartEntity extends CartBaseEntity implements Serializable {

private Set<Items> items;

@Basic(fetch = FetchType.LAZY)
@Override
public String getCartName() {
    return super.getCartName(); 
  }
}

我试图覆盖 'cartName' 列并想在其上添加 @Basic 注释。有可能还是有任何解决方法？ TIA

Answer 1

是的，可以将 @AttributeOverride 注释应用于子类:

@Entity
@Table(name = "CART2")
@AttributeOverride(name = "cartName", column = @Column(name="CART_NAME"))
public class CartEntity extends CartBaseEntity implements Serializable {
    ...
}

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更新:以下是 JPA 2.1 规范关于覆盖映射父类(super class)中的列的内容:

11.1.4 AttributeOverride Annotation

The AttributeOverride annotation is used to override the mapping of a Basic (whether explicit or default) property or field or Id property or field.

The AttributeOverride annotation may be applied to an entity that extends a mapped superclass or to an embedded field or property to override a Basic mapping or Id mapping defined by the mapped superclass or embeddable class (or embeddable class of one of its attributes).