使用NHibernate,我该如何让user.AddPost(post)
和post.setAuthor(user)
的行为方式相同?NHibernate中的双向一对多关联
这里是我的课:
public class User
{
public virtual int Id { get; set; }
public virtual string Name { get; set; }
public virtual int Age { get; set; }
private ICollection<Post> _posts = new HashSet<Post>();
public virtual ICollection<Post> Posts
{
get { return _posts; }
set { _posts = value; }
}
public override string ToString()
{
return string.Format("User{{id={0}, name='{1}', age={2}}}", Id, Name, Age);
}
}
public class Post
{
public virtual int Id { get; set; }
public virtual string Text { get; set; }
public virtual User Author { get; set; }
public override string ToString()
{
return string.Format("Post{{id={0}, text='{1}', author={2}}}", Id, Text, Author);
}
}
这里是我的映射:
<class name="User" table="users">
<id name="Id" type="int">
<column name="Id" not-null="true" />
<generator class="native"/>
</id>
<property name="Name" column="Name" />
<property name="Age" column="Age" />
<set name="Posts" inverse="true">
<key column="AuthorId" />
<one-to-many class="Post" />
</set>
</class>
<class name="Post" table="posts">
<id name="Id" type="int">
<column name="Id" not-null="true" />
<generator class="native"/>
</id>
<property name="Text" column="Text" />
<many-to-one name="Author" column="AuthorId" class="User" />
</class>
运行的代码(正常工作):
var user = new User {
Name = "loki2302",
Age = 100
};
session.Save(user);
var post = new Post {
Text = "qwerty",
Author = user
};
session.Save(post);
是否有可能也启用此方法(不起作用):
var user = new User {
Name = "loki2302",
Age = 100
};
session.Save(user);
var post = new Post {
Text = "qwerty"
};
user.Posts.Add(post);
session.save(user);
?
您是否尝试在创建用户的同一个过程中创建一个帖子?如果它是实体,我会在用户中创建一个帖子。新用户{.. new Post {} ..} – Independent
@Jonas:嗯,我刚刚开始学习NHibernate,我有点困惑,虽然这两种方法都很好,编译和运行,只是有不同的结果。更具体地说,我要么需要使两种方法都能正常工作,要么为第二种方法(不工作),我希望至少得到运行时错误,所以我发现它并没有达到我期望的效果去做。 – agibalov