Nhibernate学习教程一 简单的应用

Nhibernate学习教程一 简单的应用

其实网络里有了很多相关的资料和资源.因为第一次接触nbernate的人不少,可惜会遇到很多不同的问题.特意把我自己在使用的过程中遇到的问题给大家讲解一下.希望对新手有少少作用

网络里的例子 nhibernate1.2版本 +sqlserver2005+ vs2003

1.建立一个项目,名字叫ClassLibrary

2.新建立一个类 user

Code

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

namespace ClassLibrary
{
public class User
{
private string id;
private string userName;
private string password;
private string emailAddress;
private DateTime lastLogon;

public User()
{
}

public string Id
{
get { return id; }
set { id = value; }
}

public string UserName
{
get { return userName; }
set { userName = value; }
}

public string Password
{
get { return password; }
set { password = value; }
}

public string EmailAddress
{
get { return emailAddress; }
set { emailAddress = value; }
}

public DateTime LastLogon
{
get { return lastLogon; }
set { lastLogon = value; }
}

}
}

3. 新建立一个xml文件 User.hbm.xml

这里要注意这一段<class name="ClassLibrary.User, ClassLibrary" table="users" lazy="false">

有一点必须注意的是,必须把该xml文件右键属性设置为生成操作-->嵌入的资源

ClassLibrary是你的程序集名称和默认空间

Code
<?xml version="1.0" encoding="utf-8" ?>
<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2">
<class name="ClassLibrary.User, ClassLibrary" table="users" lazy="false">
<id name="Id" column="LogonId" type="String" length="20">
<generator class="assigned" />
</id>
<property name="UserName" column="Name" type="String" length="40"/>
<property name="Password" type="String" length="20"/>
<property name="EmailAddress" type="String" length="40"/>
<property name="LastLogon" type="DateTime"/>
</class>
</hibernate-mapping>

4.编译好dll文件

5.新增加一个项目Nhibernate1 (使用的是sqlserver2005数据库)

添加一个app.config文件

Code
<?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.connection.provider"
value="NHibernate.Connection.DriverConnectionProvider"
/>
<add key="hibernate.dialect"
value="NHibernate.Dialect.MsSql2005Dialect"
/>
<add key="hibernate.connection.driver_class"
value="NHibernate.Driver.SqlClientDriver"
/>
<add key="hibernate.connection.connection_string"
value="Server=a059\PMSERVER;initial catalog=test;User ID=sa;Password=;"
/>

</nhibernate>
</configuration>

6.在test库里建立一个数据表 User

7.建立一个窗体.然后把下面代码贴入

using System.Drawing;
using System.Text;
using System.Windows.Forms;
using NHibernate;
using NHibernate.Cfg;

Using ClassLibrary;

namespace Nhibernate1
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}

private void button1_Click(object sender, EventArgs e)
{
Configuration cfg = new Configuration();
cfg.AddAssembly("ClassLibrary");

ISessionFactory factory = cfg.BuildSessionFactory();
ISession session = factory.OpenSession();
ITransaction transaction = session.BeginTransaction();

User newUser = new User();
newUser.Id = "joe_cool_test";
newUser.UserName = "Joseph Cool";
newUser.Password = "abc123";
newUser.EmailAddress = "joe@cool.com";
newUser.LastLogon = DateTime.Now;

// Tell NHibernate that this object should be saved
session.Save(newUser);

// commit all of the changes to the DB and close the ISession
transaction.Commit();
session.Close();

MessageBox.Show("OK!");
}
}
}

遇到的错误

1.

NHibernate.MappingException: Unknown entity class:

把xml文件嵌入的资源一般可以解决

2.

cfg.AddAssembly("Nhibernate12");

未处理MappingException

Could not add assembly Nhiberate

把库类设置好一般都可以解决该问题

3.Winform其实不必要分开两个项目来实现,可以使用一个项目来实现的,原理一致

4.因为ASP.NET没有办法设置namespace,WebForm所以引用两个项目就有必要,按照上面的代码 ASP.Net测试也成功