Nhibernate学习教程二 实际表的增删操作

上一个例子是一个简单表的插入数据。

在实际中很多表都是使用Id int来做自增量来实现的。

Users结构是

USE [test]
GO
/****** 对象:  Table [dbo].[Users]    脚本日期: 09/17/2008 21:51:20 ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
CREATE TABLE [dbo].[Users](
    [Name] [nvarchar](40) COLLATE Chinese_PRC_CI_AS NULL,
    [Password] [nvarchar](20) COLLATE Chinese_PRC_CI_AS NULL,
    [EmailAddress] [nvarchar](40) COLLATE Chinese_PRC_CI_AS NULL,
    [LastLogon] [datetime] NULL,
    [Id] [int] IDENTITY(1,1) NOT NULL
) ON [PRIMARY]

User.cs

public class User
    {
        
        private string userName;
        private string password;
        private string emailAddress;
        private DateTime lastLogon;
        private System.Int32 id;

        public User()
        {
        }

        
        public System.Int32 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; }
        }

    }

 User.hbm.xml

用的是自动编号，所以，要将 <generator class="assigned" />改为  <generator class="identity"" />

Code
<?xml version="1.0" encoding="utf-8" ?>
<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2">
    <class name="Nhibernate1.User, Nhibernate1" table="users" lazy="false">
    <id name="Id" column="Id" type="Int32">
      <generator class="identity" />
    </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>

 cs

 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!");

添加时候不写入id的属性，因为数据库已经自动增加。

 删除代码如下

 private void del_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 = (User)session.Load(typeof(User), 2);
          

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

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

            MessageBox.Show("OK!");
        }

选择数据并绑定DataGridView

 Configuration cfg = new Configuration();
            cfg.AddAssembly("Nhibernate1");

            ISessionFactory factory = cfg.BuildSessionFactory();
            ISession session = factory.OpenSession();
            ITransaction transaction = session.BeginTransaction();
            myds=new DataSet();
            System.Collections.IList list = session.CreateQuery("select u from User as u").List();
           
            this.dataGridView1.DataSource = list;
          
            session.Close();

            MessageBox.Show("OK!");