例如,当我们在@OneToMany中使用mapledBy批注时,是否提到了类名或表名？

例子：

@Entity
@Table(name = "customer_tab")
public class Customer {
   @Id @GeneratedValue public Integer getId() { return id; }
   public void setId(Integer id) { this.id = id; }
   private Integer id;

   @OneToMany(mappedBy="customer_tab")
   @OrderColumn(name="orders_index")
   public List<Order> getOrders() { return orders; }

}

那么,这两个中的哪一个是正确的呢？ ：

> @OneToMany(mappedBy =“ customer_tab”)
> @OneToMany(mappedBy =“ Customer”)吗？

谢谢！

解决方法:

都不正确.从documentation开始：

mappedBy
public abstract java.lang.String mappedBy
The field that owns the relationship. Required unless the relationship is unidirectional.

mapledBy批注指示它标记的字段由关系的另一端拥有,在您的示例中为一对​​多关系的另一端.我不完全知道您的架构是什么,但是以下类定义才有意义：

@Entity
@Table(name = "customer_tab")
public class Customer {
    @OneToMany(mappedBy="customer")
    @OrderColumn(name="orders_index")
    public List<Order> getOrders() { return orders; }

}

@Entity
public class Order {
    @ManyToOne
    @JoinColumn(name = "customerId")
    // the name of this field should match the name specified
    // in your mappedBy annotation in the Customer class
    private Customer customer;
}