ADO.net测试题

有幂函数的.cs文件中的代码

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Data.SqlClient;//引用数据库命名空间
using ADO.NET测试题.数据访问类;
using ADO.NET测试题.实体类;
using System.Collections;

namespace ADO.NET测试题
{
    class Program
    {
        static void Main(string[] args)
        {
            while (true)
            {
                shujufangwenlei shu = new shujufangwenlei();
                List<student> ADO = shu.SelectAll();

                Console.WriteLine("编号  姓名  性别   年龄      生日            专业");
                foreach (student s in ADO)
                {
                    Console.WriteLine(s.code.ToString() + "   " + s.name + "   " + (s.sex ? "男" : "女") + "     " + s.age + "   " + Convert.ToDateTime(s.birthday).ToString("yyyy年MM月dd日") + "    " + s.sn);
                }

                //数据显示
                SqlConnection conn = new SqlConnection("server=.;database=ADO;user=sa;pwd=123");
                SqlCommand cmd = conn.CreateCommand();

                //询问用户接下来的操作
                Console.Write("请输入要进行的操作：（输入数字1:新增，输入数字2:修改，输入数字3:删除）");
                int caozuo = Convert.ToInt32(Console.ReadLine());

                if (caozuo == 1)//添加
                {
                    student ss = new student();
                    while (true)
                    {
                        Console.Write("请输入学生编号：");
                        ss.code = Console.ReadLine();
                        //if (s.Code == "" || s.Code == null)
                        //判断输入学号是否为空！
                        if (String.IsNullOrEmpty(ss.code))
                        {
                            Console.WriteLine("学生编号不能为空！");
                        }
                        else
                        {
                            bool isok = shu.SelectCode(ss.code);

                            if (isok)
                            {
                                break;
                            }
                            else
                            {
                                Console.WriteLine("编号已被占用！");
                            }
                        }
                    }
                    while (true)
                    {
                        Console.Write("请输入学生姓名：");
                        ss.name = Console.ReadLine();
                        if (ss.name == "")
                        {
                            Console.WriteLine("姓名不能为空！");
                        }
                        else
                        {
                            break;
                        }
                    }


                    while (true)
                    {
                        Console.Write("请输入学生性别(true/男/1,false/女/0)：");
                        string xb = Console.ReadLine();
                        if (xb == "男" || xb == "true" || xb == "女" || xb == "false" || xb == "1" || xb == "0")
                        {
                            if (xb == "男" || xb == "true" || xb == "1")
                            {
                                ss.sex = true;
                                break;
                            }
                            else if (xb == "女" || xb == "false" || xb == "0")
                            {
                                ss.sex = false;
                                break;
                            }
                        }
                        else
                        {
                            Console.WriteLine("性别输入错误！");
                        }

                    }
                    while (true)
                    {
                        Console.Write("请输入学生生日：");
                        try
                        {
                            ss.birthday = Convert.ToDateTime(Console.ReadLine());
                            break;
                        }
                        catch
                        {
                            Console.WriteLine("生日输入有误！");
                        }
                    }
                    while (true)
                    {
                        Console.Write("请输入专业：");
                        string subname = Console.ReadLine();
                        string subcode = shu.selectsc(subname);
                        if (subcode == "")
                        {
                            Console.WriteLine("查无此专业");
                        }
                        else
                        {
                            ss.subjectcode = subcode;
                            break;
                        }
                    }

                    #region 专业
                    //while (true)
                    //{
                    //    Console.Write("请输入专业：");
                    //    string subjectname = Console.ReadLine();
                    //    if (subjectname != "")
                    //    {
                    //        string sc = shu.sbname(subjectname);
                    //        if (shu.panduan1(sc))
                    //        {
                    //            ss.subjectcode = shu.sbname(subjectname);
                    //            break;
                    //        }
                    //        else
                    //        {
                    //            Console.WriteLine("查无此专业！");
                    //        }
                    //    }
                    //    else
                    //    {
                    //        Console.WriteLine("请输入专业：");
                    //    }
                    //}
                    #endregion

                    Console.Write("以上为新增学生的信息，是否确定添加？（Y/N）：");
                    string queren = Console.ReadLine();
                    if (queren.ToUpper() == "Y")
                    {
                        bool OK = shu.stuinsert(ss);
                        if (OK)//true
                        {
                            Console.Clear();
                            Console.WriteLine("添加成功！");
                        }
                        else
                        {
                            Console.WriteLine("添加失败！");
                        }
                    }
                    else { }
                    continue;
                    #region 添加是否成功
                    //string shifou = "";
                    //while (true)
                    //{
                    //    Console.Write("以上为新增学生的信息，是否确定添加？（Y/N）：");
                    //    shifou = Console.ReadLine();
                    //    if (shifou.ToUpper() == "Y")
                    //    {
                    //        shu.insert(ss);
                    //        break;
                    //    }
                    //    else
                    //    {
                    //        Console.WriteLine("操作指令输入错误！");
                    //    }
                    //}
                    //Console.Clear();
                    //Console.WriteLine("添加成功！");
                    //continue;
                    #endregion
                }
                else if (caozuo == 2)//修改
                {
                    student sss = new student();
                    //首先要确定这个学号对应的学生信息存不存在
                    Console.Write("请输入要修改的学生编号：");
                    string xiugai = Console.ReadLine();
                    bool has = shu.panduan(xiugai);
                    if (has)
                    {
                        Console.WriteLine("已查询到" + xiugai + "的学生信息，请继续修改操作");
                        Console.WriteLine(xiugai + "学生当前姓名为：" + shu.upname(xiugai));
                        while (true)
                        {
                            Console.Write("请输入您的修改：");
                            sss.name = Console.ReadLine();
                            if (sss.name == "")
                            {
                                Console.WriteLine("姓名不能为空！");
                            }
                            else
                            {
                                break;
                            }
                        }
                        Console.WriteLine(xiugai + "学生当前性别为：" + shu.upsex(xiugai));
                        while (true)
                        {
                            Console.Write("请输入您的修改：");
                            string xb = Console.ReadLine();
                            if (xb == "男" || xb == "true" || xb == "女" || xb == "false" || xb == "1" || xb == "0")
                            {
                                if (xb == "男" || xb == "true" || xb == "1")
                                {
                                    sss.sex = true;
                                    break;
                                }
                                else if (xb == "女" || xb == "false" || xb == "0")
                                {
                                    sss.sex = false;
                                    break;
                                }
                            }
                            else
                            {
                                Console.WriteLine("性别输入错误！");
                            }
                        }
                        Console.WriteLine(xiugai + "学生当前生日为：" + shu.upbirthday(xiugai));
                        while (true)
                        {
                            Console.Write("请输入您的修改：");
                            try
                            {
                                sss.birthday = Convert.ToDateTime(Console.ReadLine());
                                break;
                            }
                            catch
                            {
                                Console.WriteLine("生日输入有误！");
                            }
                        }
                        Console.WriteLine(xiugai + "学生当前专业为：" + shu.upsubjectcode(xiugai));
                        while (true)
                        {
                            Console.WriteLine("请输入您的修改：");
                            string subname = Console.ReadLine();

                            string subcode = shu.selectsc(subname);

                            if (subcode == "")
                            {
                                Console.WriteLine("查无此专业");
                            }
                            else
                            {
                                sss.subjectcode = subcode;
                                break;
                            }
                        }
                    }
                    else
                    {
                        Console.WriteLine("查无" + xiugai + "的学生信息！");
                    }
                    Console.Write("以上为新增学生的信息，是否确定添加？（Y/N）：");
                    string queren = Console.ReadLine();
                    if (queren.ToUpper() == "Y")
                    {
                        bool OK = shu.stuupdate(sss,xiugai);
                        if (OK)
                        {
                            Console.Clear();
                            Console.WriteLine("修改成功！");
                        }
                        else
                        {
                            Console.WriteLine("修改失败！");
                        }
                    }
                    else { }
                    continue;
                }
                else if (caozuo == 3)//删除
                {
                    while (true)
                    {
                        Console.Write("请输入要删除的学生编号：");
                        string shanchu = Console.ReadLine();
                        bool has = shu.panduan(shanchu);
                        if (has)
                        {
                            Console.WriteLine(shu.zhanshi(shanchu));
                            Console.Write("是否要删除此学生的信息？（Y/N):");
                            string queren = Console.ReadLine();
                            if (queren.ToUpper() == "Y")
                            {
                                shu.delete(shanchu);
                                break;
                            }
                            else
                            {
                                Console.WriteLine("操作指令输入错误！");
                            }
                        }
                        else
                        {
                            Console.WriteLine("查无" + shanchu + "的学生信息！");
                        }
                    }
                    Console.Clear();
                    Console.WriteLine("删除成功！");
                    continue;
                }
                else
                {
                    Console.WriteLine("操作指令输入有误！");
                }
            }

            Console.ReadLine();
        }
    }
}

实体类中的代码

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

namespace ADO.NET测试题.实体类
{
    public class student
    {
        SqlConnection conn = null;
        SqlCommand cmd = null;

        public student()
        {
            conn = new SqlConnection("server=.;database=ADO;user=sa;pwd=123");
            cmd = conn.CreateCommand();
        }
        private string _code;

        public string code
        {
            get { return _code; }
            set { _code = value; }
        }
        private string _name;

        public string name
        {
            get { return _name; }
            set { _name = value; }
        }
        private bool _sex;

        public bool sex
        {
            get { return _sex; }
            set { _sex = value; }
        }
        private DateTime _birthday;

        public DateTime birthday
        {
            get { return _birthday; }
            set { _birthday = value; }
        }
        private string _subjectcode;

        public string subjectcode
        {
            get { return _subjectcode; }
            set { _subjectcode = value; }
        }
        public int age
        {
            get
            {
                DateTime dt = DateTime.Now;
                return dt.Year - _birthday.Year;
            }
        }
        public string sn
        {
            get
            {
                string subjectname = "";
                cmd.CommandText = "select *from [subject] where subjectcode=@subjectcode";
                cmd.Parameters.Clear();
                cmd.Parameters.Add("@subjectcode", _subjectcode);
                conn.Open();
                SqlDataReader dr = cmd.ExecuteReader();
                if (dr.HasRows)
                {
                    dr.Read();
                    subjectname = dr["subjectname"].ToString();
                }
                conn.Close();

                return subjectname;
            }
        }

    }
}

数据访问类里的代码

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Data.SqlClient;
using ADO.NET测试题.实体类;
using System.Collections;

namespace ADO.NET测试题.数据访问类
{
    public class shujufangwenlei
    {
        SqlConnection conn = null;
        SqlCommand cmd = null;

        public shujufangwenlei()
        {
            conn = new SqlConnection("server=.;database=ADO;user=sa;pwd=123");
            cmd = conn.CreateCommand();
        }

        public List<student> SelectAll()
        {
            List<student> list = new List<student>();
            cmd.CommandText = "select *from student";
            conn.Open();
            SqlDataReader dr = cmd.ExecuteReader();
            if (dr.HasRows)
            {
                while (dr.Read())
                {
                    student s = new student();
                    s.code = dr["code"].ToString();
                    s.name = dr["name"].ToString();
                    s.sex = Convert.ToBoolean(dr["sex"]);
                    s.birthday = Convert.ToDateTime(dr["birthday"]);
                    s.subjectcode = dr["subjectcode"].ToString();
                    list.Add(s);
                }
            }
            conn.Close();
            return list;
        }

        /// <summary>
        /// 判断编号是否可用，true是可用，false不可用
        /// </summary>
        /// <param name="code"></param>
        /// <returns></returns>
        public bool SelectCode(string code)
        {
            bool has = true;

            cmd.CommandText = "select *from student where Code = @c";
            cmd.Parameters.Clear();
            cmd.Parameters.Add("@c", code);

            conn.Open();
            SqlDataReader dr = cmd.ExecuteReader();
            if (dr.HasRows)
            {
                has = false;
            }
            conn.Close();

            return has;
        }
        /// <summary>
        /// 查询有无此专业，如果有就返回专业编号
        /// </summary>
        /// <param name="subname">模糊查询的专业名称</param>
        /// <returns></returns>
        public string selectsc(string subname)
        {
            string subcode = "";
            cmd.CommandText = "select *from [subject] where subjectname like @s";
            cmd.Parameters.Clear();
            cmd.Parameters.Add("@s", "%" + subname + "%");

            conn.Open();
            SqlDataReader dr = cmd.ExecuteReader();
            if (dr.HasRows)
            {
                dr.Read();
                subcode = dr["subjectcode"].ToString();
            }
            conn.Close();
            return subcode;
        }



        /// <summary>
        /// 添加学生信息，返回true为添加成功
        /// </summary>
        /// <param name="ss">要添加的学生对象</param>
        /// <returns></returns>
        public bool stuinsert(student s)
        {
            bool isok = false;

            cmd.CommandText = "insert into student values(@a,@b,@c,@d,@e);";
            cmd.Parameters.Clear();
            cmd.Parameters.Add("@a", s.code);
            cmd.Parameters.Add("@b", s.name);
            cmd.Parameters.Add("@c", s.sex);
            cmd.Parameters.Add("@d", s.birthday);
            cmd.Parameters.Add("@e", s.subjectcode);
            try
            {
                conn.Open();
                cmd.ExecuteNonQuery();
                isok = true;
            }
            catch { }
            finally
            {
                conn.Close();
            }
            return isok;
        }

        public bool panduan(string code)
        {
            bool has = false;
            cmd.CommandText = "select *from student where code ='" + code + "'";
            conn.Open();
            SqlDataReader dr = cmd.ExecuteReader();
            if (dr.HasRows)
            {
                has = true;
            }
            conn.Close();
            return has;
        }
        public string upname(string code)
        {
            string name = "";
            cmd.CommandText = "select *from student where code ='" + code + "'";
            conn.Open();
            SqlDataReader dr = cmd.ExecuteReader();
            if (dr.HasRows)
            {
                dr.Read();
                name = dr["name"].ToString();
            }
            conn.Close();
            return name;

        }

        public string upsex(string code)
        {
            string sex = "";
            bool sex1 = false;
            cmd.CommandText = "select *from student where code ='" + code + "'";
            conn.Open();
            SqlDataReader dr = cmd.ExecuteReader();
            if (dr.HasRows)
            {
                dr.Read();
                sex1 = Convert.ToBoolean(dr["sex"]);
            }
            conn.Close();
            if (sex1 == true)
            {
                sex = "男";
            }
            else
            {
                sex = "女";
            }
            return sex;
        }
        public string upbirthday(string code)
        {
            string birthday = "";
            cmd.CommandText = "select *from student where code ='" + code + "'";
            conn.Open();
            SqlDataReader dr = cmd.ExecuteReader();
            if (dr.HasRows)
            {
                dr.Read();
                birthday = dr["birthday"].ToString();
            }
            conn.Close();
            return birthday;

        }
        public string upsubjectcode(string code)
        {
            string subjectcode = "";
            cmd.CommandText = "select *from student where code ='" + code + "'";
            conn.Open();
            SqlDataReader dr = cmd.ExecuteReader();
            if (dr.HasRows)
            {
                dr.Read();
                subjectcode = dr["subjectcode"].ToString();
            }
            conn.Close();
            return subjectcode;

        }
        public bool stuupdate(student s, string xg)
        {
            bool isok = false;

            cmd.CommandText = "update student set name=@name,sex=@sex,birthday=@birthday,subjectcode=@subjectcode where code='" + xg + "'";
            cmd.Parameters.Clear();
            cmd.Parameters.Add("@name", s.name);
            cmd.Parameters.Add("@sex", s.sex);
            cmd.Parameters.Add("@birthday", s.birthday);
            cmd.Parameters.Add("@subjectcode", s.subjectcode);

            try
            {
                conn.Open();
                cmd.ExecuteNonQuery();
                isok = true;
            }
            catch { }
            finally
            {
                conn.Close();
            }

            return isok;
        }

        public string zhanshi(string sc)
        {
            string xx = "";
            student ss = new student();
            cmd.CommandText = "select *from student where code='" + sc + "'";
            conn.Open();
            SqlDataReader dr = cmd.ExecuteReader();
            if (dr.HasRows)
            {
                dr.Read();
                ss.code = dr["code"].ToString();
                ss.name = dr["name"].ToString();
                ss.sex = Convert.ToBoolean(dr["sex"]);
                ss.birthday = Convert.ToDateTime(dr["birthday"]);
                ss.subjectcode = dr["subjectcode"].ToString();
            }
            conn.Close();
            return xx = ss.code + "  " + ss.name + "  " + Convert.ToString(ss.sex ? "男" : "女") + "  " + ss.birthday.ToString("yyyy年MM月dd日") + "  " + ss.sn;
        }
        public void delete(string no)
        {
            cmd.CommandText = "delete from student where code = @code";
            cmd.Parameters.Clear();
            cmd.Parameters.Add("@code", no);

            conn.Open();
            cmd.ExecuteNonQuery();
            conn.Close();

        }
    }
}