1
我有兩個實體加載關聯關係:與自定義查詢
public class Rank{
Short value;
@ManyToOne(fetch=FetchType.LAZY)
Picture pic;
...
}
public class Picture{
String url;
Long rank; // sum of all ranks' values
}
有沒有辦法通過查詢SELECT SUM(value) from ranks where pic = ?
加載Picture
和rank
場?