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學習目的:

通過進一步學習Nhibernate基礎知識，掌握用Nhiberate實現多對多的業務邏輯

開發環境+必要準備

開發環境: windows 2003,Visual studio .Net 2005,Sql server 2005 developer edition

3．對上篇文章的部分解釋

1)bag節點:用于定義System.Collection.IList類型的集合元素。

屬性	用法	舉例
name	映射的屬性（必須）	name=”SalaryList”
table	映射的數據表(可選)	table=”Salary”
lazy	延遲加載(可選)	Lazy=true\|false
cascade	指示級聯操作方式（可選）	Cascade=all
inverse	關聯由誰負責維護	Inverse=”true”

當lazy=”true”，父類初始化的時候不會自動加載子類集合

Cascade為級聯操作方式，包括：

屬性	用法說明
none	默認值，不進行級聯操作
save-update	save和update級聯
delete	刪除級聯
delete-orphan	刪除不相關的父對象的子對象
all	save/update/delete級聯
all-delete-orphan	all+delete-arphan

當inverse=”true”的時候代表由子類維護級聯關系。這時候如果只往父類中添加子類，但不設定子類的父類，是不能保存子類的。

4．多對多業務模型

還是用戶系統，1個用戶職員隸屬于多個部門，同時1個部門有多個不同的職員
用戶和部門之間的數據關系圖為:

5. 實現步驟:
1)User.cs

User.cs

using System;

using System.Collections.Generic;

using System.Text;

namespace NhibernateSample1

{

public class User

{

private int _id;

private string _name;

private string _pwd;

private System.Collections.IList_departmentsList;

/// <summary>

/// 編號

/// </summary>

public virtual int Id

{

get

{

return _id;

}

set

{

_id = value;

}

/// <summary>

/// 名稱

/// </summary>

public virtual string Name

{

get

{

return _name;

}

set

{

_name = value;

}

/// <summary>

/// 密碼

/// </summary>

public virtual string Pwd

{

get

{

return _pwd;

}

set

{

_pwd = value;

}

/// <summary>

/// 工資列表

/// </summary>

public System.Collections.IListDepartmentsList

{

get

{

return _departmentsList;

}

set

{

_departmentsList = value;

}

2)User.hbm.xml

User.hbm.xml

3) Departments.cs

Departments

using System;

using System.Collections.Generic;

using System.Text;

using System.Collections;

namespace NhibernateSample1

{

public class Departments

{

int _depID;

string _name;

IList_usersList = new ArrayList();

public virtual int DepID

{

get

{

return _depID;

}

set

{

_depID = value;

}

public virtual string Name

{

get

{

return _name;

}

set

{

_name = value;

}

public virtual IListUsersList

{

get

{

return _usersList;

}

set

{

_usersList = value;

}

4) Departments.hbm.xml

Departments.hbm.xml

5) 數據操作類

UserDepartmentFixure.cs

using System;

using System.Collections.Generic;

using System.Text;

using System.Collections;

using NHibernate;

using NHibernate.Cfg;

using NHibernate.Tool.hbm2ddl;

namespace NhibernateSample1

{

public class UserDepartmentFixure

{

private ISessionFactory_sessions;

public void Configure()

{

Configurationcfg = GetConfiguration();

_sessions = cfg.BuildSessionFactory();

}

ConfigurationGetConfiguration()

{

string cfgPath = @" E:/myproject/nhibernatestudy/simle1/NHibernateStudy1/NhibernateSample1/hibernate.cfg.xml " ;

Configurationcfg = new Configuration().Configure(cfgPath);

return cfg;

}

public void ExportTables()

{

Configurationcfg = GetConfiguration();

new SchemaExport(cfg).Create( true , true );

}

public UserCreateUser(Stringname, string pwd)

{

Useru = new User();

u.Name = name;

u.Pwd = pwd;

u.DepartmentsList = new ArrayList();

ISessionsession = _sessions.OpenSession();

ITransactiontx = null ;

try

{

tx = session.BeginTransaction();

session.Save(u);

tx.Commit();

}

catch (HibernateExceptione)

{

if (tx != null )tx.Rollback();

throw e;

}

finally

{

session.Close();

}

return u;

}

public DepartmentsCreateDepartments(Useru, string name)

{

Departmentsitem = new Departments();

item.Name = name;

u.DepartmentsList.Add(item);

item.UsersList.Add(u);

ISessionsession = _sessions.OpenSession();

ITransactiontx = null ;

try

{

tx = session.BeginTransaction();

session.Save(item);

tx.Commit();

}

catch (HibernateExceptione)

{

if (tx != null )tx.Rollback();

throw e;

}

finally

{

session.Close();

}

return item;

}

public DepartmentsGetDepartments( int depID)

{

ISessionsession = _sessions.OpenSession();

ITransactiontx = null ;

try

{

tx = session.BeginTransaction();

Departmentsitem = (Departments)session.Load( typeof (Departments),

depID);

tx.Commit();

return item;

}

catch (HibernateExceptione)

{

if (tx != null )tx.Rollback();

return null ;

}

finally

{

session.Close();

}

return null ;

}

public UserGetUser( int uid)

{

ISessionsession = _sessions.OpenSession();

ITransactiontx = null ;

try

{

tx = session.BeginTransaction();

Useritem = (User)session.Load( typeof (User),

uid);

tx.Commit();

return item;

}

catch (HibernateExceptione)

{

if (tx != null )tx.Rollback();

return null ;

}

finally

{

session.Close();

}

return null ;

}

public void Delete( int uid)

{

ISessionsession = _sessions.OpenSession();

ITransactiontx = null ;

try

{

tx = session.BeginTransaction();

Departmentsitem = session.Load( typeof (Departments),uid) as Departments;

session.Delete(item);

tx.Commit();

}

catch (HibernateExceptione)

{

if (tx != null )tx.Rollback();

throw e;

}

finally

{

session.Close();

}

6)單元測試類

UnitTest1.cs

using System;

using System.Text;

using System.Collections.Generic;

using Microsoft.VisualStudio.TestTools.UnitTesting;

using NhibernateSample1;

namespace TestProject1

{

/// <summary>

/// UnitTest1的摘要說明

/// </summary>

[TestClass]

public class UnitTest1

{

public UnitTest1()

{

// TODO:在此處添加構造函數邏輯

}

NhibernateSample1.UserDepartmentFixureusf = new UserDepartmentFixure();

其他測試屬性

[TestMethod]

public void Test1()

{

usf.Configure();

usf.ExportTables();

Useru = usf.CreateUser(Guid.NewGuid().ToString(), " ds " );

Assert.IsTrue(u.Id > 0 );

Departmentss = usf.CreateDepartments(u, " 政治部 " );

Assert.IsTrue(s.DepID > 0 );

Departmentss1 = usf.CreateDepartments(u, " 事業部 " );

Assert.IsTrue(s1.DepID > 0 );

usf.Delete(s1.DepID);

s1 = usf.GetDepartments(s1.DepID);

Assert.IsNull(s1);

Useru1 = usf.GetUser( 1 );

Assert.IsTrue(u1.DepartmentsList.Count > 0 );

}

到現在為止，終于更加體會到nhibernate的強大了。繼續努力，fight!
files: /Files/jillzhang/simple3.rar
上幾篇文章: Nhibernate學習之起步篇-1
Nhibernate分析之華山論劍篇
Nhibernate學習起步之many-to-one篇

Nhibernate學習之many-to-many篇

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