ado.net 实体类_数据访问类

实体类：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace 实体类_数据访问类.App_Code
{
    public class Users
    {
        private int _code;
        /// <summary>
        /// code
        /// </summary>
        public int Code
        {
            get { return _code; }
            set { _code = value; }
        }
        private string _usename;
        /// <summary>
        /// 用户名
        /// </summary>
        public string Usename
        {
            get { return _usename; }
            set { _usename = value; }
        }
        private string _password;
        /// <summary>
        /// 用户密码
        /// </summary>
        public string Password
        {
            get { return _password; }
            set { _password = value; }
        }
        private string _nick;
        /// <summary>
        /// 昵称
        /// </summary>
        public string Nick
        {
            get { return _nick; }
            set { _nick = value; }
        }
        private bool _sex;
        /// <summary>
        /// 性别
        /// </summary>
        public bool Sex
        {
            get { return _sex; }
            set { _sex = value; }
        }
        private string _nation;
        /// <summary>
        /// 民族
        /// </summary>
        public string Nation
        {
            get { return _nation; }
            set { _nation = value; }
        }
        private string _class;
        /// <summary>
        /// 班级
        /// </summary>
        public string _class1
        {
            get { return _class; }
            set { _class = value; }
        }
        private DateTime _birthday;
        /// <summary>
        /// 生日
        /// </summary>
        public DateTime Birthday
        {
            get { return _birthday; }
            set { _birthday = value; }
        }
    }
}

数据访问类：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Data.SqlClient;

namespace 实体类_数据访问类.App_Code
{
    public class UserDate
    {
        SqlConnection conn = null;
        SqlCommand com = null;
        public UserDate()
        {
            conn = new SqlConnection("server=.;database=Data1128;user=sa;pwd=123");
            com = conn.CreateCommand();
        }
        /// <summary>
        /// 将数据添加到Users表中，添加成功返回true,失败返回false
        /// </summary>
        /// <param name="u">要添加到表中的Users对象</param>
        /// <returns>添加成功返回true,失败返回false</returns>
        public bool insert(Users u)
        {
            bool ok = false;
            int count = ;
            com.CommandText = "insert into Users values(@usename,@password,@nick,@sex,@nation,@class,@birthday)";
            com.Parameters.Clear();
            com.Parameters.AddWithValue("@usename",u.Usename);
            com.Parameters.AddWithValue("@password", u.Password);
            com.Parameters.AddWithValue("@nick", u.Nick);
            com.Parameters.AddWithValue("@sex", u.Sex);
            com.Parameters.AddWithValue("@nation", u.Nation);
            com.Parameters.AddWithValue("@class", u._class1);
            com.Parameters.AddWithValue("@birthday", u.Birthday);
            try
            {
                conn.Open();
                count=com.ExecuteNonQuery();
            }
            catch
            {
                ok = false;
            }
            finally
            {
                conn.Close();
            }
            if(count>)
            {
                ok = true;
            }

            return ok;
        }

        /// <summary>
        /// 通过泛型集合对数据进行查询
        /// </summary>
        /// <returns>返回一个集合</returns>
        public List<Users> Select()
        {
            List<Users> list= new List<Users>();
            com.CommandText = "select *from Users";
            conn.Open();
            SqlDataReader dr = com.ExecuteReader();
            if(dr.HasRows)
            {
                while(dr.Read())
                {
                    Users u = new Users();
                    u.Code = Convert.ToInt32(dr["code"]);
                    u.Usename = dr["usename"].ToString();
                    u.Password = dr["password"].ToString();
                    u.Nick = dr["nick"].ToString();
                    u.Sex = Convert.ToBoolean(dr["sex"]);
                    u.Nation = dr["nation"].ToString();
                    u._class1 = dr["class"].ToString();
                    u.Birthday = Convert.ToDateTime(dr["birthday"]);

                    list.Add(u);
                }

            }

            conn.Close();
            return list;
        }

        /// <summary>
        /// 根据usename进行查询
        /// </summary>
        /// <param name="usename">要查询的usename对象</param>
        /// <returns>返回bool类型的值，返回true表示有usename这条数据</returns>
        public bool select(string usename)
        {
            bool has = false;
            com.CommandText = "select *from Users where usename=@usename";
            com.Parameters.Clear();
            com.Parameters.AddWithValue("@usename",usename);
            conn.Open();
            SqlDataReader dr = com.ExecuteReader();
            if(dr.HasRows)
            {
                has = true;
            }
            conn.Close();
            return has;
        }
        //public void delete(string username)
        //{
        //    com.CommandText = "delete from Users where usename=@usename";
        //    com.Parameters.Clear();
        //    com.Parameters.AddWithValue("@usename", username);

        //    conn.Open();
        //    com.ExecuteNonQuery();
        //    conn.Close();
        //}

        /// <summary>
        /// 删除数据
        /// </summary>
        /// <param name="username">要查询的usename对象</param>
        /// <returns>返回bool类型的值，返回true表示删除成功</returns>
        public bool delete(string username)
        {
            bool have = false;
            int cc = ;
            com.CommandText = "delete from Users where usename=@usename";
            com.Parameters.Clear();
            com.Parameters.AddWithValue("@usename", username);
            try
            {
                conn.Open();
                cc = com.ExecuteNonQuery();
            }
            catch
            {
                have = false;
            }
            finally
            {
                conn.Close();
            }
            if (cc > )
            {
                have = true;
            }
            return have;
        }
    }
}

业务逻辑类：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using 实体类_数据访问类.App_Code;

namespace 实体类_数据访问类
{
    class Program
    {
        static void Main(string[] args)
        {
            //完整查询操作，创建泛型数组引用UsersDate的Select方法
            List<Users> ulist = new UserDate().Select();
            //遍历数组
            foreach(Users uuu in ulist)
            {
                Console.WriteLine(uuu.Code+"\t"+uuu.Usename+"\t"+uuu.Password+"\t"+uuu.Nick+"\t"+uuu.Sex+"\t"+uuu.Nation+"\t"+uuu._class1+"\t"+uuu.Birthday);
            }

            //完整删除操作
            Console.WriteLine("请输入要删除的用户名：");
            string uname = Console.ReadLine();
            //select方法的返回值为true，说明有此用户
            if (new UserDate().select(uname))
            {
                Console.WriteLine("已查到此用户信息，是否要删除？(Y/N)");//用户操作
                string yn = Console.ReadLine();
                if (yn.ToUpper() == "Y")
                {
                    //delete方法的返回值为true，删除成功
                    if (new UserDate().delete(uname))
                        Console.WriteLine("删除成功！");
                    //delete方法的返回值为false，删除失败
                    else
                        Console.WriteLine("删除失败！");
                }

                else
                {
                    Console.WriteLine("取消删除！！");
                }
            }
            //select方法的返回值为false，无此用户
            else
            {
                Console.WriteLine("未查到此用户信息！！");
            }
            //Console.WriteLine("请输入要删除的用户名：");
            //string uname = Console.ReadLine();
            //if (new UserDate().select(uname))
            //{
            //    Console.WriteLine("已查到此用户信息，是否要删除？(Y/N)");
            //    string yn = Console.ReadLine();
            //    if (yn.ToUpper() == "Y")
            //    {
            //        new UserDate().delete(uname);
            //            Console.WriteLine("删除成功！");

            //    }
            //    else
            //    {
            //        Console.WriteLine("取消删除！！");
            //    }
            //}
            //else
            //{
            //    Console.WriteLine("未查到此用户信息！！");
            //}

            //添加用户操作
            Users user = new Users();
            Console.WriteLine("请输入用户名：");
            user.Usename = Console.ReadLine();
            Console.WriteLine("请输入密码：");
            user.Password = Console.ReadLine();
            Console.WriteLine("请输入昵称：");
            user.Nick = Console.ReadLine();
            Console.WriteLine("请输入性别：");
            user.Sex = Convert.ToBoolean(Console.ReadLine());
            Console.WriteLine("请输入民族：");
            user.Nation = Console.ReadLine();
            Console.WriteLine("请输入班级：");
            user._class1 = Console.ReadLine();
            Console.WriteLine("请输入生日：");
            user.Birthday = Convert.ToDateTime(Console.ReadLine());

            UserDate ud = new UserDate();
            bool isok= ud.insert(user);//数据访问类中insert方法的返回值
            if (isok)
                Console.WriteLine("添加成功！");
            else
                Console.WriteLine("添加失败！！");
            Console.ReadLine();
        }
    }
}