代码之家 › 专栏 › 技术社区 › squillman Johnny Fitz

NHibernate-子对象为空

load nhibernate asp.net-mvc

-1

squillman Johnny Fitz · 技术社区 · 16 年前

[Class(Table="t_Posts",Lazy=false)]
public class Post : IPost
{
    [Id(Name = "PostId")]
    public virtual long PostId { get; set; }

    [Property(Column="OwnerID")]
    public virtual long OwnerId { get; set; }

    [Property(Column="DatePosted")]
    public virtual DateTime DatePosted { get; set; }

    [OneToOne(0,ForeignKey="OwnerId",Lazy=Laziness.False,ClassType=typeof(User))]
    public virtual IUser Owner { get; set; }

    [Property(Column="ParentID")]
    public virtual long ParentId { get; set; }

    [Set(0,Name="Replies",Inverse=true,Cascade="all-delete-orphan", Lazy=false)]
    [Key(1,Column="ParentId")]
    [OneToMany(2,ClassType=typeof(Post))]
    public virtual ISet<Post> Replies{ get; set; }
}

[Class(Lazy=false,Table="t_Users")]
public class User : IUser
{
    [Id(Name="UserId")]
    public virtual long UserId { get; set; }

    [Property(Column="LoginName")]
    public virtual string LoginName { get; set; }
}

1 回复 | 直到 16 年前

Canton 16 年前

对于Post。主人,你应该把它映射成多对一。XML中的示例

<many-to-one name="Owner" lazy="false" column="OwnerId"/>

一对一映射将假设这两个实体具有相同的ID值。还有一点需要注意,NH Mapping中的ForeignKey是指FK的名称,而不是外键列。

这里有一个友好的提示,你不需要同时拥有OwnerId和Owner属性。你所需要的只是业主的财产。您也不需要ParentId属性,但请确保在Post上设置了Inverse=false。回复

public class Post
{
    public virtual long PostId { get; set; }
    public virtual DateTime DatePosted { get; set; }
    public virtual User Owner { get; set; }
    public virtual ISet<Post> Replies { get; set; }

    public Post()
    {
        Replies = new HashedSet<Post>();
    }
}

public class User
{
    public virtual long UserId { get; set; }
    public virtual string LoginName { get; set; }
}

Post的地图

<?xml version="1.0" encoding="utf-8" ?>
<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2"
                   namespace="Mfs.Core"
                   assembly="Mfs.Core">
  <class name="Post" table="tPost" lazy="false">
    <id name="PostId">
      <generator class="hilo"></generator>
    </id>

    <property name="DatePosted" type="timestamp"/>

    <!--<one-to-one name="Owner" lazy="false" foreign-key="OwnerId"/>-->
    <many-to-one name="Owner" lazy="false" column="OwnerId"/>

    <set name="Replies" inverse="false" cascade="all-delete-orphan" lazy="false">
      <key column="ParentId"/>
      <one-to-many class="Post" />
    </set>
  </class>
</hibernate-mapping>

用户映射

<?xml version="1.0" encoding="utf-8" ?>
<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2"
                   namespace="Mfs.Core"
                   assembly="Mfs.Core">
  <class name="User" table="tUser" lazy="false">
    <id name="UserId">
      <generator class="hilo"></generator>
    </id>
    <property name="LoginName"></property>
  </class>
</hibernate-mapping>