NHibernate系列学习(一)-看看用NH怎么做增速改查

1.本次所有代码是在一下环境下运行的

2.什么是NHibernate

NHibernate是ORM框架中的一种，那么什么是ORM框架，我在MVC那边有一篇介绍EF框架时说过。

大家可以看看这篇文章什么是ORM框架

这里就强调一句话：【ORM（Object Relational Mapping）是一种为了解决面向对象与关系型数据库互相匹配而存在的技术】。

3.开始NH之旅

本次学习的代码结构如下

第一步：在数据库中创建.net类持久化的对应表

create table T_Student
  (
    SId int primary key identity(1,1),
    SName nvarchar(10),
    SAge int
  )

第二步：创建需要被持久化的.Net类

namespace Kimisme
{
    public class Student
    {
        public int Id { get; set; }
        public string Name { get; set; }
        public int Age { get; set; }
    }
}

第三步：创建映射文件，告诉NH怎么持久化这些类以及它的属性Student.hbm.xml

<?xml version="1.0" encoding="utf-8"?>
<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2" default-lazy="false">
  <class name="Test.Student,Test" table="T_Student">
    <id name="Id" column="sId" type="int">
      <generator class="native" />
    </id>
    <property name="Name" column="sName" type="string"  />
    <property name="Age" column="sAge" type="int"  />
  </class>
</hibernate-mapping>

说明：

第四步：创建NH的配置文件，告诉NH要连接什么数据库以及怎么连接数据库App.config

<?xml version="1.0" encoding="utf-8" ?>
<configuration>

  <configSections>
    <section name="hibernate-configuration" type="NHibernate.Cfg.ConfigurationSectionHandler,NHibernate" requirePermission="false"/>
  </configSections>

  <hibernate-configuration  xmlns="urn:nhibernate-configuration-2.2" >
    <session-factory>
      <property name="connection.provider">NHibernate.Connection.DriverConnectionProvider, NHibernate</property>
      <property name="connection.driver_class">NHibernate.Driver.SqlClientDriver</property>
      <property name="connection.connection_string">Server=(local);initial catalog=KimDB;Integrated Security=SSPI</property>
      <property name="show_sql">true</property>
      <property name="dialect">NHibernate.Dialect.MsSql2012Dialect</property>
    </session-factory>
  </hibernate-configuration>

    <startup>
        <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.5" />
    </startup>
</configuration>

说明：

第五步：使用NH提供的API做增速改查

首先看看本次完成后的界面 以及 代码层次：

4.终于可以敲代码了

首先要引用两个文件，一个是Kimisme类库，一个是NHibernate.dll

namespace KimismeDemo
{
    public partial class Form1 : Form
    {
        private ISession session = null;
        private ISessionFactory factory = null;
        private ITransaction trans = null;
        public Form1()
        {
            InitializeComponent();
        }

        #region 0.初始化session以及session工厂 - private void Form1_Load(object sender, EventArgs e)
        private void Form1_Load(object sender, EventArgs e)
        {
            Configuration config = new Configuration().AddAssembly("Kimisme");
            factory = config.BuildSessionFactory();
            session = factory.OpenSession();
        }
        #endregion

        #region 1.0 添加学生 -  private void btnAdd_Click(object sender, EventArgs e)
        private void btnAdd_Click(object sender, EventArgs e)
        {
            trans = session.BeginTransaction();
            try
            {
                Student stu = new Student();
                stu.Name = txtName.Text;
                stu.Age = Convert.ToInt32(txtAge.Text);
                session.Save(stu);
                trans.Commit();
                MessageBox.Show("添加成功");
            }
            catch (Exception ex)
            {
                trans.Rollback();
                MessageBox.Show(ex.Message);
            }
        }
        #endregion

        #region 2.0 根据id查找学生 - private void btnSearch_Click(object sender, EventArgs e)
        private void btnSearch_Click(object sender, EventArgs e)
        {
            try
            {
                Student stu = session.Get(typeof(Student), int.Parse(txtId.Text)) as Student;
                MessageBox.Show("姓名：【" + stu.Name + "】年龄：" + stu.Age);
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }
        }
        #endregion

        #region 3.0 根据Id修改学生 -  private void btnEdit_Click(object sender, EventArgs e)
        private void btnEdit_Click(object sender, EventArgs e)
        {
            trans = session.BeginTransaction();
            try
            {
                Student stu = session.Get(typeof(Student), int.Parse(txtEditId.Text)) as Student;
                stu.Name = txtEditName.Text;
                stu.Age = Convert.ToInt32(txtEditAge.Text);
                session.Update(stu);
                trans.Commit();
                MessageBox.Show("修改成功");
            }
            catch (Exception ex)
            {
                trans.Rollback();
                MessageBox.Show(ex.Message);
            }
        }
        #endregion

        #region 4.0 根据id删除学生 - private void btnDelete_Click(object sender, EventArgs e)
        private void btnDelete_Click(object sender, EventArgs e)
        {
            trans = session.BeginTransaction();
            try
            {
                Student stu = session.Get(typeof(Student), int.Parse(txtDeleteId.Text)) as Student;
                session.Delete(stu);
                trans.Commit();
                MessageBox.Show("删除成功");
            }
            catch (Exception ex)
            {
                trans.Rollback();
                MessageBox.Show(ex.Message);
            }
        }
        #endregion
    }
}

5.代码下载