Hibernate 一个实体中两个表mysql的简单连接

我试图从两个表中创建JPA中的实体：

书

股票

我想创建一个图书实体，如下所示：

@Entity
public class Book {

    @Id
    @GeneratedValue
    private int    id;
    private String name;
    private String author;
    private Date   releaseDate;

    @JoinTable  
    private Integer   quantity;

}

@Entity
public class Book {

  @Id
  @GeneratedValue
  private int    id;
  private String name;
  private String author;
  private Date   releaseDate;

  @OneToMany(fetch = FetchType.EAGER)
  @JoinColumn(name= "stock_book_id")
  private Stock stock; 
}

并从另一个表中获取数量值

这可能吗

---

谢谢

您的实体应该是这样的：

@Entity
public class Book {

    @Id
    @GeneratedValue
    private int    id;
    private String name;
    private String author;
    private Date   releaseDate;

    @JoinTable  
    private Integer   quantity;

}

@Entity
public class Book {

  @Id
  @GeneratedValue
  private int    id;
  private String name;
  private String author;
  private Date   releaseDate;

  @OneToMany(fetch = FetchType.EAGER)
  @JoinColumn(name= "stock_book_id")
  private Stock stock; 
}

然后您应该像属性一样将

StockDTO

类添加到

BookDTO

中