.NET的那些事儿(4)——NHibernate中的单表操作

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之前的文章写的东西比较杂乱，也许很多人并不熟悉NUnit，所以本文举的例子跟NUnit是脱离的，对于初学者而言，最主要的还是单表操作，以及明白NHibernate究竟给我们带来了什么革命性的胜利。希望对大家在进行NHibernate单表操作的时候有点启发。流程大致包括

0、创建数据库和数据表

1、新建项目NHibernateSingle

2、新建App.Config配置数据库连接(本文使用的是SQL Server2000)

3、创建Sessions类建立Session对象

4、创建ObjectBroker类用于封装Nhibernate操作

5、创建UserInfo类

6、创建UserInfo映射文件UserInfo.hbm.xml

7、在Main函数中添加测试代码

0 创建数据库和数据表

先创建数据库，名称取为NHibernate，然后建立数据表UserInfo.

if exists (select * from dbo.sysobjects where id = object_id(N'[dbo].[UserInfo]') and OBJECTPROPERTY(id, N'IsUserTable') = 1)drop table [dbo].[UserInfo]GOCREATE TABLE [dbo].[UserInfo] ([UserID] [int] IDENTITY (1, 1) NOT NULL ,[UserName] [varchar] (50) COLLATE Chinese_PRC_CI_AS NULL ,[UserPwd] [varchar] (50) COLLATE Chinese_PRC_CI_AS NULL ,[UserRole] [varchar] (50) COLLATE Chinese_PRC_CI_AS NULL ) ON [PRIMARY]GO

1 新建项目NHibernateSingle(如下图所示)：注意添加引用NHibernate

新建项目

2、新建App.Config配置数据库连接(本文使用的是SQL Server2000)

<?xml version="1.0" encoding="utf-8" ?><configuration> <configSections>  <section name="nhibernate" type="System.Configuration.NameValueSectionHandler, System, Version=1.0.5000.0,Culture=neutral, PublicKeyToken=b77a5c561934e089" /> </configSections> <nhibernate>  <add key="hibernate.show_sql" value="true" />  <add key="hibernate.connection.provider" value="NHibernate.Connection.DriverConnectionProvider" />  <add key="hibernate.dialect" value="NHibernate.Dialect.MsSql2000Dialect" />  <add key="hibernate.connection.driver_class" value="NHibernate.Driver.SqlClientDriver" />  <add key="hibernate.connection.connection_string" value="Server=localhost;initial catalog=NHibernate;user id=sa;password=123;Min Pool Size=2" /> </nhibernate></configuration>

3、创建Sessions类建立Session对象

using System;using System.Collections.Generic;using System.Text;using NHibernate;using System.Reflection;namespace NHibernateSingle{ public class Sessions { private static readonly object lockObj = new object(); private static ISessionFactory _factory; public Sessions() { // // TODO: 在此处添加构造函数逻辑 // } public static ISessionFactory Factory { get { if (_factory == null) { lock (lockObj) { if (_factory == null) { NHibernate.Cfg.Configuration cfg = new NHibernate.Cfg.Configuration(); cfg.AddAssembly(Assembly.GetExecutingAssembly()); _factory = cfg.BuildSessionFactory(); } } } return _factory; } } public static ISession GetSession() { return Factory.OpenSession(); } }}

4、创建ObjectBroker类用于封装Nhibernate操作，再创建BizObject类用于封装ObjectBroker类操作

ObjectBroker.cs

using System;using System.Collections.Generic;using System.Text;using NHibernate;namespace NHibernateSingle{ public class ObjectBroker { private ObjectBroker() { } public static void Load(object obj, object id) { ISession s = Sessions.GetSession(); try { s.Load(obj, id); } finally { s.Close(); } } public static void Create(object obj) { ISession s = Sessions.GetSession(); ITransaction trans = null; try { trans = s.BeginTransaction(); s.Save(obj); trans.Commit(); } finally { s.Close(); } } public static void Update(object obj) { ISession s = Sessions.GetSession(); ITransaction trans = null; try { trans = s.BeginTransaction(); s.Update(obj); trans.Commit(); } finally { s.Close(); } } public static void Delete(object obj) { ISession s = Sessions.GetSession(); ITransaction trans = null; try { trans = s.BeginTransaction(); s.Delete(obj); trans.Commit(); } finally { s.Close(); } } }}

BizObject.cs

using System;using System.Collections.Generic;using System.Text;using NHibernate;using NUnit.Framework;namespace NHibernateSingle{ public class BizObject { public BizObject() { } public BizObject(object existingId) { ObjectBroker.Load(this, existingId); } public virtual void Create() { ObjectBroker.Create(this); } public virtual void Update() { ObjectBroker.Update(this); } public virtual void Delete() { ObjectBroker.Delete(this); } }}

5、创建UserInfo类,从BizObject继承

using System;using System.Collections.Generic;using System.Text;namespace NHibernateSingle{ class UserInfo : BizObject { public UserInfo() : base() { } public UserInfo(int existingId) : base(existingId) { } private int _userid=0; private String _username; private String _userpwd; private String _userrole; public int UserID { set { this._userid = value; } get { return this._userid; } } public String UserName { set { this._username = value; } get { return this._username; } } public String UserPwd { set { this._userpwd = value; } get { return this._userpwd; } } public String UserRole { set { this._userrole = value; } get { return this._userrole; } } }}

6、创建UserInfo映射文件UserInfo.hbm.xml(文件名必须保持一致)

<?xml version="1.0" encoding="utf-8" ?><hibernate-mapping xmlns="urn:nhibernate-mapping-2.2"> <class name="NHibernateSingle.UserInfo, NHibernateSingle" table="UserInfo" lazy="false"> <id name="UserID" column="UserID" type="Int32" unsaved-value="0"> <generator class="identity"/> </id> <property name="UserName" column="UserName" type="String" /> <property name="UserPwd" column="UserPwd" type="String" /> <property name="UserRole" column="UserRole" type="String" /> </class></hibernate-mapping>

7、在Main函数中添加测试代码

using System;using System.Collections.Generic;using System.Text;using NHibernate;using NUnit.Framework;namespace NHibernateSingle{ class Program { static void Main(string[] args) { UserInfo u = new UserInfo(); u.UserName = "rocket"; u.UserPwd = "rrr"; u.UserRole = "admin"; u.Create();//insert操作 UserInfo u2 = new UserInfo(u.UserID); u2.UserPwd = "rrrrr"; u2.Update();//update操作 UserInfo u3 = new UserInfo(u.UserID); u3.Delete();//delete操作 } }}

结论

此时运行解决方案后，就可以在数据表中看到插入的数据，用户可以根据以上的代码就可以进行insert、update、delete操作了。此时我们再看一下整个解决方案的文件组织结构，以及看到Main函数中执行的语句，大家就可以知道NHibernate究竟帮助我们做了些什么工作了。

文件结构