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nhibernate學習之三級聯(Ternary Associations)

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園子里面的兄弟們好，由于工作和身體的原因，幾天來都沒有寫有關nhibernate學習系列了。看了看前幾篇大家的回復，首先想要多謝兄弟們對小弟的關注和支持，可小弟水平有限，寫出來的也只是入門級的心得。只是有一個心愿，那就是拋磚引玉，希望能和大家更多更好的互動。技術無極限，而我更想要得是能在園子里面認識更多的兄弟，更多的朋友。對了，忘記了一點事情，那就是，兄弟們，節日快樂，哈哈哈。。。唧唧歪歪這么多，大家不要見笑，下面進入正題
1) 學習目標
通過進一步學習Nhibernate基礎知識，掌握用Nhiberate實現對級聯的支持，通過一個簡單的用戶角色權限系統來體驗nhibernate對級聯的強大支持。

2）開發環境和必要準備
開發環境為:windows 2003,Visual studio .Net 2005,Sql server 2005 developer edition
必要準備：學習前三篇nhibernate學習系列 Nhibernate學習之起步篇-1 , Nhibernate學習起步之many-to-one篇 , Nhibernate學習之many-to-many篇

3)示例
業務需求：實現一個用戶角色權限系統，一個用戶只有一個角色，一個角色下有多個用戶，一個角色下有多個權限，一個權限也對應多個角色
要求: (1).創建一個角色 (2)在該角色上創建兩個個用戶3)創建兩個權限4)指定該角色上的權限列表5)獲得一個用戶的權限列表
首先看關系數據庫關系圖:
nhibernate學習之三級聯(Ternary Associations)篇
4)實現步驟:
1.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 Role_role;
/**/ /// <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;
}
}
public virtual RoleRole
{
get
{
return _role;
}
set
{
_role = value;
}
}
}
}
User.hbm.xml
<? xmlversion = " 1.0 " encoding = " utf-8 " ?>
< hibernate - mappingxmlns = " urn:nhibernate-mapping-2.2 " >
< class name = " NhibernateSample1.User,NhibernateSample1 " table = " Users " lazy = " false " >
< idname = " Id " column = " Id " unsaved - value = " 0 " >
< generator class = " native " />
</ id >
< propertyname = " Name " column = " Name " type = " string " length = " 64 " not - null = " true " unique = " true " ></ property >
< propertyname = " Pwd " column = " Pwd " type = " string " length = " 64 " not - null = " true " ></ property >
< many - to - onename = " Role " class = " NhibernateSample1.Role,NhibernateSample1 " column = " RoleID " ></ many - to - one >
</ class >
</ hibernate - mapping >
2.Role.cs
using System;
using System.Collections.Generic;
using System.Text;
using System.Collections;

namespace NhibernateSample1
{
public class Role
{
int _roleID;
string _roleName;
IList_list = new ArrayList();
IList_permissionList = new ArrayList();
public virtual IListPermissionList
{
get
{
return _permissionList;
}
set
{
_permissionList = value;
}
}
public virtual int RoleID
{
get
{
return _roleID;
}
set
{
_roleID = value;
}
}
public virtual IListUserList
{
get
{
return _list;
}
set
{
_list = value;
}
}
public virtual string RoleName
{
get
{
return _roleName;
}
set
{
_roleName = value;
}
}
}
}
Role.hbm.xml
<? xmlversion = " 1.0 " encoding = " utf-8 " ?>
< hibernate - mappingxmlns = " urn:nhibernate-mapping-2.2 " >
< class name = " NhibernateSample1.Role,NhibernateSample1 " table = " Roles " lazy = " false " >
< idname = " RoleID " column = " RoleID " unsaved - value = " 0 " >
< generator class = " native " />
</ id >
< propertyname = " RoleName " column = " RoleName " type = " string " length = " 64 " not - null = " true " ></ property >
< bagname = " PermissionList " table = " Role_Permissions " inverse = " true " lazy = " false " cascade = " all " >
< keycolumn = " RoleID " />
< many - to - many class = " NhibernateSample1.Permission,NhibernateSample1 " column = " PermissionID " ></ many - to - many >
</ bag >
< bagname = " UserList " table = " Users " inverse = " true " lazy = " false " cascade = " all " >
< keycolumn = " RoleID " />
< one - to - many class = " NhibernateSample1.User,NhibernateSample1 " ></ one - to - many >
</ bag >
</ class >
</ hibernate - mapping >
3.Permission.cs
using System;
using System.Collections.Generic;
using System.Text;
using System.Collections;

namespace NhibernateSample1
{
public class Permission
{
int _permissionID;
string _permissionName;
IList_roleList = new ArrayList();
public virtual int PermissionID
{
get
{
return _permissionID;
}
set
{
_permissionID = value;
}
}
public virtual string PermissionName
{
get
{
return _permissionName;
}
set
{
_permissionName = value;
}
}
public virtual IListRoleList
{
get
{
return _roleList;
}
set
{
_roleList = value;
}
}
}
}
Permission.hbm.xml
<? xmlversion = " 1.0 " encoding = " utf-8 " ?>
< hibernate - mappingxmlns = " urn:nhibernate-mapping-2.2 " >
< class name = " NhibernateSample1.Permission,NhibernateSample1 " table = " Permissions " lazy = " false " >
< idname = " PermissionID " column = " PermissionID " unsaved - value = " 0 " >
< generator class = " native " />
</ id >
< propertyname = " PermissionName " column = " PermissionName " type = " string " length = " 64 " not - null = " true " unique = " true " ></ property >
< bagname = " RoleList " table = " Role_Permissions " lazy = " true " >
< keycolumn = " PermissionID " />
< many - to - many class = " NhibernateSample1.Role,NhibernateSample1 " column = " RoleID " ></ many - to - many >
</ bag >
</ class >
</ hibernate - mapping >
4。數據操作類
UserRolePermissionFixure
<!--<br><br>Code highlighting produced by Actipro CodeHighlighter (freeware)<br>http://www.CodeHighlighter.com/<br><br>--> 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 UserRolePermissionFixure
{
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 RoleCreateRole( string roleName)
{
Roler = new Role();
r.RoleName = roleName;
ISessionsession = _sessions.OpenSession();
ITransactiontx = null ;
try
{
tx = session.BeginTransaction();
session.Save(r);
tx.Commit();
}
catch (Exceptione)
{
if (tx != null )tx.Rollback();
throw e;
}
finally
{
session.Close();
}
return r;

}

public UserCreateUser(Stringname, string pwd,Roler)
{
Useru = new User();
u.Name = name;
u.Pwd = pwd;
u.Role = r;
// r.UserList.Add(u);
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 PermissionCreatePermission(Roler, string name)
{
Permissionp = new Permission();
p.PermissionName = name;
r.PermissionList.Add(p);
p.RoleList.Add(r);
ISessionsession = _sessions.OpenSession();
ITransactiontx = null ;

try
{
tx = session.BeginTransaction();
session.Save(p);
tx.Commit();
}
catch (HibernateExceptione)
{
if (tx != null )tx.Rollback();
throw e;
}
finally
{
session.Close();
}
return p;
}
public void DeleteRole( int rid)
{
ISessionsession = _sessions.OpenSession();
ITransactiontx = null ;
try
{
tx = session.BeginTransaction();
Roleitem = session.Load( typeof (Role),rid) as Role;
session.Delete(item);
tx.Commit();
}
catch (HibernateExceptione)
{
if (tx != null )tx.Rollback();
throw e;
}
finally
{
session.Close();
}
}

}
}
5。單元測試類
UnitTest1.cs
<!--<br><br>Code highlighting produced by Actipro CodeHighlighter (freeware)<br>http://www.CodeHighlighter.com/<br><br>--> 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.UserRolePermissionFixureusf = new UserRolePermissionFixure();
其他測試屬性 #region 其他測試屬性
//
// 您可以在編寫測試時使用下列其他屬性:
//
// 在運行類中的第一個測試之前使用ClassInitialize運行代碼
// [ClassInitialize()]
// publicstaticvoidMyClassInitialize(TestContexttestContext){}
//
// 在類中的所有測試都已運行之后使用ClassCleanup運行代碼
// [ClassCleanup()]
// publicstaticvoidMyClassCleanup(){}
//
// 在運行每個測試之前使用TestInitialize運行代碼
// [TestInitialize()]
// publicvoidMyTestInitialize(){}
//
// 在運行每個測試之后使用TestCleanup運行代碼
// [TestCleanup()]
// publicvoidMyTestCleanup(){}
//
#endregion

[TestMethod]
public void Test1()
{
usf.Configure();
usf.ExportTables();
Roler = usf.CreateRole( " test " );
Assert.IsTrue(r.RoleID > 0 );
Useru = usf.CreateUser(Guid.NewGuid().ToString(), " ds " ,r);
Assert.IsTrue(u.Id > 0 );
Permissionp = usf.CreatePermission(r, " 查詢 " );
Assert.IsTrue(p.PermissionID > 0 );
}

}
}
通過本篇的學習，將充分理解到nhibernate對級聯支持的強大。另外除了支持三級聯之外，他還支持異類關聯(Heterogeneous Associations) .給開發帶來了更多的靈活性和實用性。而且考慮到性能的問題，還添加了lazy這樣的延遲加載的功能，加載父親不必要一定要加載他的兒子集合。通過集合類映射，nhinernate輕松實現級聯，這相比較代碼生成來說，無疑是一個優點。

nhibernate學習之三級聯(Ternary Associations)篇


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