我有一個類MyClass class MyClass
{
public string Name { get; set; } // is unique among all instances
public SomeClass Data { get; set; }
...
}
其中我想幾個實例存儲收藏。我經常需要檢查是否存在具有某個名稱的實例，如果存在，請檢索該實
所以，我有如下的例子： movies = {
dobby: "dobster is a lad",
pirates_of_the_carribean: "Its all about jack sparrow kicking ass!"
}
puts "what do you want to know about?\n
#{movies[:dobby]}. = 1\
JPA：圖加入值（）路徑例如， @Entity
public class Book {
@OneToMany
@MapKey
Map<Long, Chapter> chapters;
}
@Entity
public class Chapter {
@Id Long id;
String name;
}
CriteriaQuer