Nhibernate学习之many-to-many篇

学习目的:

通过进一步学习Nhibernate基础知识，掌握用Nhiberate实现多对多的业务逻辑

开发环境+必要准备

开发环境: windows 2003,Visual studio .Net 2005,Sql server 2005 developer edition

前期准备: 学习上两篇单表操作和many-to-one篇

3．对上篇文章的部分解释

1)bag节点:用于定义System.Collection.IList类型的集合元素。

属性	用法	举例
name	映射的属性（必须）	name=”SalaryList”
table	映射的数据表(可选)	table=”Salary”
lazy	延迟加载(可选)	Lazy=true|false
cascade	指示级联操作方式（可选）	Cascade=all
inverse	关联由谁负责维护	Inverse=”true”

当lazy=”true”，父类初始化的时候不会自动加载子类集合

Cascade为级联操作方式，包括：

属性	用法说明
none	默认值，不进行级联操作
save-update	save和update级联
delete	删除级联
delete-orphan	删除不相关的父对象的子对象
all	save/update/delete级联
all-delete-orphan	all+delete-arphan

using System;
using System.Collections.Generic;
using System.Text;

namespace NhibernateSample1

2)User.hbm.xml

<?xml version="1.0" encoding="utf-8" ?>
<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2">
<class name="NhibernateSample1.User,NhibernateSample1" table="Users" lazy="false">
<id name="Id" column="Id" unsaved-value="0">
<generator class="native" />
</id>
<property name="Name" column="Name" type="string" length="64" not-null="true" unique="true"></property>
<property name="Pwd" column="Pwd" type="string" length="64" not-null="true"></property>
<bag name="DepartmentsList" table="Users_Departments" inverse="true" lazy="false" cascade="all">
<key column="Id"/>
<many-to-many class="NhibernateSample1.Departments,NhibernateSample1" column="DepID"></many-to-many>
</bag>
</class>
</hibernate-mapping>
3) Departments.cs
using System;
using System.Collections.Generic;
using System.Text;
using System.Collections;

namespace NhibernateSample1

4) Departments.hbm.xml

<?xml version="1.0" encoding="utf-8" ?>
<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2">
<class name="NhibernateSample1.Departments,NhibernateSample1" table="Departments" lazy="false">
<id name="DepID" column="DepID" unsaved-value="0">
<generator class="native" />
</id>
<property name="Name" column="Name" type="string" length="64" not-null="true" unique="true"></property>
<bag name="UsersList" table="Users_Departments" lazy="true" >
<key column="DepID"/>
<many-to-many class="NhibernateSample1.User,NhibernateSample1" column="Id"></many-to-many>
</bag>
</class>
</hibernate-mapping>
5) 数据操作类
using System;
using System.Collections.Generic;
using System.Text;
using System.Collections;
using NHibernate;
using NHibernate.Cfg;
using NHibernate.Tool.hbm2ddl;

namespace NhibernateSample1

6)单元测试类

using System;
using System.Text;
using System.Collections.Generic;
using Microsoft.VisualStudio.TestTools.UnitTesting;
using NhibernateSample1;

namespace TestProject1

到现在为止，终于更加体会到nhibernate的强大了。继续努力，fight!
files:/Files/jillzhang/simple3.rar