我正在尝试学习NHibernate 3.2 built-in mapping by code api
( NOT Fluent NHibernate )。你能帮我勾画出这些实体之间的一对多关系吗?
public class Member {
public virtual int Id { get; set; }
public virtual ICollection<Comment> Comments { get; set; }
}
public class Comment {
public virtual int Id { get; set; }
public virtual Member { get; set; }
}
更新
我像这样映射Id
:
Id(
t => t.Id,
t => {
t.Generator(Generators.HighLow, g => g.Params(new { max_low = 100 }));
t.Column(typeof(TEntity).Name + "Id");
});
答案 0 :(得分:8)
这并不像听起来那么容易,因为我们现在不是你的主要关键策略,如果你正在使用包或套装,你使用什么级联等等......但是说,下面是一个应该让你开始的小样本......
成员映射: -
//note: bag could be Set
public class MemberMapping : ClassMapping<Member> {
public MemberMapping() {
Id(x => x.Id, x => { x.Generator(...); etc... });
Bag(x => x.CmsRegionContentList, bag => {
bag.Inverse(true); // Is collection inverse?
bag.Cascade(Cascade.DeleteOrphans); //set cascade strategy
bag.Key(k => k.Column(col => col.Name("MemberId"))); //foreign key in Comment table
}, a => a.OneToMany());
}
}
对于评论映射: -
public class CommentMapping : ClassMapping<Comment> {
public CommentMapping() {
Id(x => x.Id, x => { x.Generator(...); etc... });
ManyToOne(x => x.Page, x => {
x.Column("MemberId");
x.Update(false); //either True or False
x.Insert(false);
x.Fetch(FetchKind.Join); //fetch join or select
});
}
}
编辑我还应该指出,您确实需要了解XML映射的基础知识,并了解Update
和Insert
等每个属性对您的方式的影响。模型是持久的。