NHibernate初學之增刪改查

1.獲取NHibernate
首先到 http://www.nhforge.org/下載NHibernate的最新版本，本示例的NHibernate版本爲官方2008年9月29日最新發布的NHibernate-2.0.1.GA版本.
2.建數據庫，建表
Create Database Nhibernate
Go
Use Nhibernate
Go
Create table Users
(
Id int primary key identity(1,1),
[Name] varchar(100),
Email varchar(100),
Password varchar(100)
)
Go
SELECT * FROM Users
3.代碼編寫
打開 Visual Studio 2005 新建 WebApplication，命名爲NHibernateSample,添加相關DLL的引用。
新建model文件夾，在該文件夾下建User類，代碼如下:

using System;

namespace NHibernateSample.model
{
    public class User
    {
        public int id;
        public int Id
        {
            get { return id; }
            set { id = value; }
        }

        public string name;
        public string Name
        {
            get { return name; }
            set { name = value; }
        }

        public string email;
        public string Email
        {
            get { return email; }
            set { email = value; }
        }

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

在model文件夾下新建User.hbm.xml,設置屬性中生成操作爲"嵌入的資源",輸入以下內容：
<?xml version="1.0" encoding="utf-8" ?>
<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2">
<class name="NHibernateSample.model.User,NHibernateSample" table="Users" lazy="false">
  <id name="Id" column="Id" type="Int32">
   <generator class="native"></generator>
     </id>
  <property name="Name" column="Name" type="String" length="100"></property>
  <property name="Email" column="Email" type="String" length="100"></property>
  <property name="Password" column="Password" type="String" length="100"></property>
    </class>
</hibernate-mapping>

在根目錄下建立hibernate.cfg.xml文件，設置屬性中生成操作爲"嵌入的資源",輸入以下內容:
<?xml version="1.0" encoding="utf-8" ?>
<hibernate-configuration xmlns="urn:nhibernate-configuration-2.2" >
<session-factory name="NHibernateSample">
  
  <property name="connection.provider">NHibernate.Connection.DriverConnectionProvider</property>
  <property name="connection.driver_class">NHibernate.Driver.SqlClientDriver</property>
  <property name="connection.connection_string">Server=yangchun;initial catalog=NHibernate;uid=sa;pwd=sql;</property>
  <property name="show_sql">false</property>
  <property name="dialect">NHibernate.Dialect.MsSql2005Dialect</property>
  <property name="use_outer_join">true</property>
  
  <mapping assembly="NHibernateSample" />
</session-factory>
</hibernate-configuration>

在頁面編寫如下代碼:
1.插入數據:

        protected void btnSave_Click(object sender, EventArgs e)
        {
            NHibernate.Cfg.Configuration cfg = new NHibernate.Cfg.Configuration().Configure(Server.MapPath("~/hibernate.cfg.xml"));
            NHibernate.ISession session = cfg.BuildSessionFactory().OpenSession();
            NHibernate.ITransaction transaction = session.BeginTransaction();
            NHibernateSample.model.User user = new NHibernateSample.model.User();

            try
            {
                user.Name = txtName.Text;
                user.Email = txtEmail.Text;
                user.Password = txtPassword.Text;
                session.Save(user);
                transaction.Commit();
                RegisterStartupScript("alert", "<script>alert('保存成功!');</script>");
            }
            catch (Exception ex)
            {
                transaction.Rollback();
                RegisterStartupScript("alert", "<script>alert('保存失敗!錯誤信息如下:" + ex.Message + "');</script>");
            }
            finally
            {
                session.Close();
            }
        }
2.查詢數據
        private void LoadInfo( int Id)
        {
            NHibernate.Cfg.Configuration cfg = new NHibernate.Cfg.Configuration().Configure(Server.MapPath("~/hibernate.cfg.xml"));
            NHibernate.ISession session = cfg.BuildSessionFactory().OpenSession();
            NHibernateSample.model.User user = new NHibernateSample.model.User();
            user = (NHibernateSample.model.User)session.Load(typeof(NHibernateSample.model.User), Id);
            txtId.Text = user.Id.ToString();
            txtName.Text = user.Name;
            txtEmail.Text = user.Email;
            txtPassword.Text = user.Password;
        }
3.查詢全部數據:
         private void Load()
        {
            NHibernate.Cfg.Configuration cfg = new NHibernate.Cfg.Configuration().Configure(Server.MapPath("~/hibernate.cfg.xml"));
            NHibernate.ISession session = cfg.BuildSessionFactory().OpenSession();
            grdItems.DataSource = session.CreateQuery("select u from User as u").List();
            grdItems.DataBind();
            session.Close();
        }
4.修改數據:
        protected void btnSave_Click(object sender, EventArgs e)
        {
            NHibernate.Cfg.Configuration cfg = new NHibernate.Cfg.Configuration().Configure(Server.MapPath("~/hibernate.cfg.xml"));
            NHibernate.ISession session = cfg.BuildSessionFactory().OpenSession();
            NHibernate.ITransaction transaction = session.BeginTransaction();
            NHibernateSample.model.User user = new NHibernateSample.model.User();
            try
            {
                user.Id = Convert.ToInt32(txtId.Text.Trim());
                user.Name = txtName.Text;
                user.Email = txtEmail.Text;
                user.Password = txtPassword.Text;
                session.Update(user);
                transaction.Commit();
                RegisterStartupScript("alert", "<script>alert('修改成功!');</script>");
            }
            catch (Exception ex)
            {
                transaction.Rollback();
                RegisterStartupScript("alert", "<script>alert('修改失敗!錯誤信息如下:" + ex.Message + "');</script>");
            }
            finally
            {
                session.Close();
            }
        }

5.刪除數據:
        protected void grdItems_DeleteCommand(object source, DataGridCommandEventArgs e)
        {
            NHibernate.Cfg.Configuration cfg = new NHibernate.Cfg.Configuration().Configure(Server.MapPath("~/hibernate.cfg.xml"));
            NHibernate.ISession session = cfg.BuildSessionFactory().OpenSession();
            NHibernate.ITransaction transcation = session.BeginTransaction();
            try
            {
                NHibernateSample.model.User user = new NHibernateSample.model.User();
                user.Id = Convert.ToInt32(e.Item.Cells[0].Text.Trim());
                session.Delete(user);
                transcation.Commit();
                RegisterStartupScript("alert", "<script>alert('刪除成功!');</script>");
                Load();
            }
            catch (Exception ex)
            {
                transcation.Rollback();
                RegisterStartupScript("alert", "<script>alert('刪除失敗!錯誤信息如下:" + ex.Message + "');</script>");
            }
            finally
            {
                session.Close();
            }
        }

   目前初學，寫的不對或者不好的請見諒!