如何在 N 层应用程序中使用 Fluent NHibernate?
我正在尝试在我的项目中采用 Fluent NHibernate,目前我可以从数据库获取数据,当我在应用程序服务器上时,数据包括其 PK,但是当我将此数据(作为列表)返回给客户端时,其所有 PK 都是松动的。
我该如何解决这个问题?
更新
我的 POCO 类如下: PK 是 CountryCd 和 CityCd
public class coCity
{
public virtual string CountryCd { get; private set; }
public virtual string CityCd { get; private set; }
public virtual string CityNameTH { get; set; }
public virtual string CityNameEN { get; set; }
public virtual int DeliveryLeadTime { get; set; }
public virtual string CreateBy { get; set; }
public virtual DateTime CreateDate { get; set; }
public virtual string UpdateBy { get; set; }
public virtual DateTime UpdateDate { get; set; }
public override bool Equals(object obj)
{
return this.GetHashCode().Equals(obj.GetHashCode());
}
public override int GetHashCode()
{
return (this.CountryCd + this.CityCd).GetHashCode();
}
}
映射类:
public class coCityMap : ClassMap<coCity>
{
public coCityMap()
{
Table("coCity"); // this is optional
CompositeId()
.KeyProperty(x => x.CountryCd)
.KeyProperty(x => x.CityCd);
Map(x => x.CityNameTH);
Map(x => x.CityNameEN);
Map(x => x.DeliveryLeadTime);
Map(x => x.CreateBy);
Map(x => x.CreateDate);
Map(x => x.UpdateBy);
Map(x => x.UpdateDate);
}
}
在应用程序服务器获取数据的源代码
public List<coCity> GetTest()
{
List<coCity> result = new List<coCity>();
var sessionFactory = CreateSessionFactory();
using (var session = sessionFactory.OpenSession())
{
result = (List<coCity>)session.CreateCriteria(typeof(coCity)).List<coCity>();
}
return result;
}
当其仍在应用程序服务器时,数据可以正确检索,如下图所示 替代文本 http://img138.imageshack.us/img138/1071/serverside.png< /a>
但是,当此数据传输回客户端时,其所有 PK 都松散,如下所示。 替代文本 http://img203.imageshack.us/img203/1664/clientside.png< /a>
I'm trying to adopt Fluent NHibernate with my project, currently I can get data from database, when I'm at application server, data is include its PK but when I return this data (as List) to client all of its PK is loose.
How can I fixed this problem?
Update
My POCO class is below: PKs are CountryCd and CityCd
public class coCity
{
public virtual string CountryCd { get; private set; }
public virtual string CityCd { get; private set; }
public virtual string CityNameTH { get; set; }
public virtual string CityNameEN { get; set; }
public virtual int DeliveryLeadTime { get; set; }
public virtual string CreateBy { get; set; }
public virtual DateTime CreateDate { get; set; }
public virtual string UpdateBy { get; set; }
public virtual DateTime UpdateDate { get; set; }
public override bool Equals(object obj)
{
return this.GetHashCode().Equals(obj.GetHashCode());
}
public override int GetHashCode()
{
return (this.CountryCd + this.CityCd).GetHashCode();
}
}
Mapping class:
public class coCityMap : ClassMap<coCity>
{
public coCityMap()
{
Table("coCity"); // this is optional
CompositeId()
.KeyProperty(x => x.CountryCd)
.KeyProperty(x => x.CityCd);
Map(x => x.CityNameTH);
Map(x => x.CityNameEN);
Map(x => x.DeliveryLeadTime);
Map(x => x.CreateBy);
Map(x => x.CreateDate);
Map(x => x.UpdateBy);
Map(x => x.UpdateDate);
}
}
Source code to get data at application server
public List<coCity> GetTest()
{
List<coCity> result = new List<coCity>();
var sessionFactory = CreateSessionFactory();
using (var session = sessionFactory.OpenSession())
{
result = (List<coCity>)session.CreateCriteria(typeof(coCity)).List<coCity>();
}
return result;
}
When its still at application server data is retrieve correctly as image below
alt text http://img138.imageshack.us/img138/1071/serverside.png
However when this data transit back to client side all of its PKs is loose like below.
alt text http://img203.imageshack.us/img203/1664/clientside.png
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评论(2)
首先,这对于 Fluent NHibernate 来说不是问题,因此:
请注意,这与这个问题无关:您的 Equals() 实现非常糟糕,因为它没有考虑类型并且仅依赖于 GetHashCode 值。如果你的所有类都有这个实现,你可能会遇到麻烦。
First of all, this isn't a problem with Fluent NHibernate so:
Note that is irrelevant with this question: your Equals() implementation is really bad as it doesn't take into account types and depends only on GetHashCode value. If all your classes have this implementation you could run into trouble.
我认为问题在于 PK 属性上的私有设置器。尝试将其更改为公开。
无论哪种方式,都用
Serialized
标记您的实体一些注释:
I think the problem is with that private setter on the PK's properties. Try changing that to public.
Either way, mark your entity with
Serializable
A few comments: