3.创建Manager类，演示对TestUser进行增删改查功能

接上一篇文章 创建NHibernateHelper帮助类，生成sessionFactory

http://www.cnblogs.com/fzxiaoyi/p/8443587.html

创建个新的类Manager,演示对TestUser进行增删改查功能

编写代码如下：

using MySQLDateBase.Model;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace MySQLDateBase.Manager
{
    /// <summary>
    /// 这个类用于对TestUser进行增删改查功能
    /// </summary>
    class Manager
    {
        //获取TestUser所有用户信息
        public IList<TestUser> GetAllUser()
        {
            using (var session = NHibernateHelper.OpenSession())
            {
                using (var transaction = session.BeginTransaction())
                {
                    var userList = session.QueryOver<TestUser>();
                    transaction.Commit();
                    return userList.List();
                }
            }
        }
        //通过用户名查询用户
        public IList<TestUser> GetUserByUserName(string userName)
        {
            using (var session = NHibernateHelper.OpenSession())
            {
                using (var transaction = session.BeginTransaction())
                {
                    var userList = session.QueryOver<TestUser>().Where(user => user.Username == userName);
                    transaction.Commit();
                    return userList.List();
                }
            }
        }
        //增加用户
        public void AddUser(TestUser user)
        {
            using (var session = NHibernateHelper.OpenSession())
            {
                using (var transaction = session.BeginTransaction())
                {
                    session.Save(user);
                    transaction.Commit();
                }
            }
        }
        //删除用户
        public void DeleteUserById(int id)
        {
            using (var session = NHibernateHelper.OpenSession())
            {
                using (var transaction = session.BeginTransaction())
                {
                    TestUser user = new TestUser();
                    user.Id = id;
                    //注意如果指定主键不存在，就会抛出异常
                    session.Delete(user);
                    transaction.Commit();
                }
            }
        }
        //修改用户
        public void ModifyUser(TestUser user)
        {
            using (var session = NHibernateHelper.OpenSession())
            {
                using (var transaction = session.BeginTransaction())
                {
                    session.Update(user);
                    transaction.Commit();
                }
            }
        }

        //测试用的入口,注释掉Program.cs中的Main函数
        static void Main(string[] arrgs)
        {
            Manager testUserManager = new Manager();

            //获取所有用户信息
            Console.WriteLine("获取所有用户信息:");
            IList<TestUser> allUserList = testUserManager.GetAllUser();
            foreach (TestUser item in allUserList)
            {
                Console.WriteLine("用户名:{0} | 密码:{1}" ,item.Username,item.Password);
            }
            //通过用户名查询用户
            Console.WriteLine("******************************");
            Console.WriteLine("通过用户名查询用户:");
            IList<TestUser> testuserList_1 = testUserManager.GetUserByUserName("xiaoyi");
            foreach (var item in testuserList_1)
            {
                Console.WriteLine("用户名:{0} | 密码:{1}",item.Username,item.Password);
            }
            //增加用户
            Console.WriteLine("******************************");
            Console.WriteLine("增加用户:");
            TestUser newUser = new TestUser();
            newUser.Username = "新用户777";
            newUser.Password = "001002";
            newUser.Age = 50;
            testUserManager.AddUser(newUser);
            //删除用户
            Console.WriteLine("******************************");
            Console.WriteLine("删除用户:");
            //删除上面新添加的用户
            testUserManager.DeleteUserById(newUser.Id);
            //修改用户
            Console.WriteLine("******************************");
            Console.WriteLine("修改用户:");
            IList<TestUser> testuserList_2 = testUserManager.GetUserByUserName("xiaoyi");
            //修改所有用户中的第一个用户的密码为abcdefg
            allUserList[0].Password = "abcdefg";
            testUserManager.ModifyUser(allUserList[0]);

            //最后获取所有用户信息
            Console.WriteLine("最后获取所有用户信息:");
            IList<TestUser> allUserList_1 = testUserManager.GetAllUser();
            foreach (TestUser item in allUserList)
            {
                Console.WriteLine("用户名:{0} | 密码:{1}", item.Username, item.Password);
            }

            Console.ReadKey();
        }
    }
}