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