Question

我有一个SQL查询

SELECT * FROM Thing AS a JOIN Thing_Property AS b ON a.id=b.Thing_ID 
   JOIN Property AS c ON b.properties_ID = c.id 
   JOIN Item AS d ON c.item_ID = d.id 
   ORDER BY a.name, d.name

和Eclipselink用它来创建我的对象模型。这是模型：

@SuppressWarnings("serial")
@Entity
public class Thing implements Serializable {
     @Id
     @GeneratedValue(strategy = GenerationType.TABLE)
     private int id;
     private String name;
     @OneToMany(cascade=CascadeType.ALL)
     @PrivateOwned
     private List<Property> properties = new ArrayList<Property>();
     ...
     // getter and setter following here
}
public class Property implements Serializable { 
    @Id
    @GeneratedValue(strategy = GenerationType.TABLE)
    private int id;

    @OneToOne
    private Item item;

     private String value;
     ...
     // getter and setter following here
}
public class Item implements Serializable {
    @Id
    @GeneratedValue(strategy = GenerationType.TABLE)
    private int id;
    private String name;
     ....
     // getter and setter following here    
}
// Code end

但我无法弄清楚，如何让Eclipselink从该查询创建模型。你能帮忙吗？

Answer 1

您需要使用API EntityManager.createNativeQuery（String sqlString，Class resultClass）;

entityManager.createNativeQuery（“SELECT * FROM Thing as a JOIN Thing_Property AS b ON a.id = b.Thing_ID JOIN Property AS c ON b.properties_ID = c.id JOIN Item AS d ON c.item_ID = d.id ORDER BY a.name，d.name“，Thing.class）;

Eclipselink：从JOIN查询创建对象

1 个答案: