mappedBy引用一个未知的目标实体属性 [英] mappedBy reference an unknown target entity property

问题描述

我有以下几项：

  @MappedSuperclass 
 public abstract class MappedModel 
 {
 @Id 
 @GeneratedValue（strategy = GenerationType.AUTO）
 @Column（name =id，nullable = false，unique = true）
 private long mId; 
  

然后这个

  @Entity 
 @Table（name =customer）
 public class Customer extends MappedModel implements Serializable 
 {
 
 / ** 
 * 
 * / 
 private static final long serialVersionUID = -2543425088717298236L; 
 
 
 / **收集店铺。 * / 
 @OneToMany（mappedBy =customer，cascade = CascadeType.ALL，fetch = FetchType.LAZY）
 private Collection< Store>专卖店; 
  

和

  @Entity 
 @Table（name =store）
 public class Store扩展MappedModel实现Serializable 
 {
 
 / ** 
 * 
 * / 
 private static final long serialVersionUID = -9017650847571487336L; 
 $ b $ **许多商店都有一个客户** / 
 @ManyToOne（fetch = FetchType.LAZY）
 @JoinColumn（name =customer_id，referencedColumnName =id ，nullable = false，unique = true）
 private Customer mCustomer; 
  

我在这做什么不正确

mappedBy 属性引用 customer ，而属性 mCustomer ，因此是错误消息。因此，将您的映射改为：

  / **商店的集合。 * / 
 @OneToMany（mappedBy =mCustomer，cascade = CascadeType.ALL，fetch = FetchType.LAZY）
 private Collection< Store>专卖店; 
  

或者将实体属性更改为 customer （这就是我会做的）。

mappedBy引用指出查看名为'customer'的bean属性，查看我收集的东西来查找配置。

I am having an issue in setting up a one to many relationship in my annotated object.

I have the following:

@MappedSuperclass
public abstract class MappedModel
{
    @Id
    @GeneratedValue(strategy=GenerationType.AUTO)
    @Column(name="id",nullable=false,unique=true)
    private Long mId;

then this

@Entity
@Table(name="customer")
public class Customer extends MappedModel implements Serializable
{

    /**
   * 
   */
  private static final long serialVersionUID = -2543425088717298236L;


  /** The collection of stores. */
    @OneToMany(mappedBy = "customer", cascade = CascadeType.ALL, fetch = FetchType.LAZY)
  private Collection<Store> stores;

and this

@Entity
@Table(name="store")
public class Store extends MappedModel implements Serializable
{

    /**
   * 
   */
  private static final long serialVersionUID = -9017650847571487336L;

  /** many stores have a single customer **/
  @ManyToOne(fetch = FetchType.LAZY)
  @JoinColumn (name="customer_id",referencedColumnName="id",nullable=false,unique=true)
  private Customer mCustomer;

what am i doing incorrect here

解决方案

The mappedBy attribute is referencing customer while the property is mCustomer, hence the error message. So either change your mapping into:

/** The collection of stores. */
@OneToMany(mappedBy = "mCustomer", cascade = CascadeType.ALL, fetch = FetchType.LAZY)
private Collection<Store> stores;

Or change the entity property into customer (which is what I would do).

The mappedBy reference indicates "Go look over on the bean property named 'customer' on the thing I have a collection of to find the configuration."

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