框架ORMNHbibernate 框架

NHibernate ORM 框架是从 Java Hibernate 移植到 .NET 平台的对象关系映射框架

项目验证测试，基于 . Net 3.5 平台 NHibernate MS-SqlServer

1. 数据库E-R 图

以 Size ( 数据库表） ProductSize ( Class ) 为例，通过 NHibernate 中的 XML 文件文件 Brand.hbm.xml

这个 XML 文件存放着一些元数据，NHibernate 框架通过这些元数据了解领域模型中的业务实体与数据模型中的数据表

如果彼此在一起。

层超类型 EntityBase<Tid>

 1 using System.Collections.Generic;
 2 
 3 namespace Agathas.Storefront.Infrastructure.Domain
 4 {
 5     public abstract class EntityBase<TId>
 6     {
 7         private List<BusinessRule> _brokenRules = new List<BusinessRule>();
 8 
 9         public TId Id { get; set; }
10 
11         protected abstract void Validate();
12 
13         public IEnumerable<BusinessRule> GetBrokenRules()
14         {
15             _brokenRules.Clear();
16             Validate();
17             return _brokenRules;
18         }
19 
20         protected void AddBrokenRule(BusinessRule businessRule)
21         {
22             _brokenRules.Add(businessRule);
23         }
24 
25         public override bool Equals(object entity)
26         {
27             return entity != null
28                && entity is EntityBase<TId>
29                && this == (EntityBase<TId>)entity;
30         }
31 
32         public override int GetHashCode()
33         {
34             return this.Id.GetHashCode();
35         }
36 
37         public static bool operator ==(EntityBase<TId> entity1,
38            EntityBase<TId> entity2)
39         {
40             if ((object)entity1 == null && (object)entity2 == null)
41             {
42                 return true;
43             }
44 
45             if ((object)entity1 == null || (object)entity2 == null)
46             {
47                 return false;
48             }
49 
50             if (entity1.Id.ToString() == entity2.Id.ToString())
51             {
52                 return true;
53             }
54 
55             return false;
56         }
57 
58         public static bool operator !=(EntityBase<TId> entity1,
59             EntityBase<TId> entity2)
60         {
61             return (!(entity1 == entity2));
62         }
63     }
64 
65 }

View Code

类 ProductSize

 1 using System;
 2 using System.Collections.Generic;
 3 using System.Linq;
 4 using System.Text;
 5 
 6 using Agathas.Storefront.Infrastructure.Domain;
 7 
 8 namespace Agathas.Storefront.Model.Products
 9 {
10     public class ProductSize:EntityBase<int>, IProductAttribute
11     {
12         public string Name { get; set; }
13 
14         protected override void Validate()
15         {
16             throw new NotImplementedException();
17         }
18     }
19 }

View Code

在 XML 文件配置：此为一个简单的匹配

接下来以 ProductTitle ，其包含 Brand， Categories, Colors 外键，1对多关系，且自身为 Product 的多对一关系

productTitle 类

继续配置 Category

 1 <?xml version="1.0" encoding="utf-8" ?>
 2 <hibernate-mapping xmlns="urn:nhibernate-mapping-2.2"
 3                    namespace="Agathas.Storefront.Model.Products"
 4                    Assembly="Agathas.Storefront.Model">
 5 
 6   <class name="ProductTitle" table="ProductTitles" lazy="false">
 7 
 8     <id name="Id" column="ProductTitleId" type="int" unsaved-value="0">
 9       <generator class="native"></generator>
10     </id>
11 
12     <property name="Name">
13       <column name="Name" sql-type="nvarchar(50)" not-null="true"></column>
14     </property>
15 
16     <property name="Price">
17       <column name="Price" sql-type="decimal(18, 2)" not-null="true"></column>
18     </property>
19 
20     <many-to-one name="Brands"
21                  class="Brand"
22                  column="BrandId"
23                  not-null="true">    
24       
25     </many-to-one>
26 
27     <may-to-one name="Color"
28                 class="ProductColor"
29                 column="ColorId"
30                 not-null="true">
31       
32     </may-to-one>
33 
34     <many-to-one name="Category"
35                  class="Agathas.Storefront.Model.Categories.Category"
36                  not-null="true"
37                  lazy="false">
38       
39     </many-to-one>
40 
41     <bag name="Product"
42          inverse="true"
43          cascade="all"
44          lazy="false"
45          fetch="join">
46       <key column="ProductTitleId"></key>
47       <one-to-many class="Product"></one-to-many>
48 
49     </bag>
50     
51   </class>
52   
53 </hibernate-mapping>

View Code

Product 一对多关系

数据库 E-R 关系

将所有的 NHibernate XML 配置文件的构建动作修改为 Embeded Resource,这样 NHibernate 框架就能够找到映射元数据。

配置好业务实体与数据表之间的映射关系，就可以编写 NHibernate Repository.