ado 小测试

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using adoceshi.model;
using adoceshi.dataopration;

namespace adoceshi
{
    class Program
    {
        static void Main(string[] args)
        {
            while (true)
            {
                //打印学生表
                List<Student> data = new studentdata().selectall();
                Console.WriteLine("编号" + "	" + "姓名" + "	" + "性别" + "	" + "年龄" + "	" + "生日" + "	" + "	" + "专业");
                foreach (Student s in data)
                {
                    Console.WriteLine(s.Code + "	" + s.Name + "	" + s.strsex + "	" + s.nianling + "	" + s.strbirthday + "	" + s.SsubjectName);
                }
                Console.WriteLine("--------------------------------------------------------------------------");
                //用户操作
                Console.Write("请输入您的操作数字（1=新增，2=修改，3=删除，4=退出）：");
                string caozuo = Console.ReadLine();
                if(caozuo=="1")
                {
                    studentdata z = new studentdata();
                    z.xinzeng();
                }
                else if (caozuo == "2")
                {
                    Console.Write("请输入您要修改的学生的编号：");
                    string bianhao = Console.ReadLine();
                    studentdata g = new studentdata();
                    g.xiugai(bianhao);
                }
                else if (caozuo == "3")
                {
                    Console.Write("请输入您要删除的学生的编号：");
                    string bianhao = Console.ReadLine();
                    studentdata g = new studentdata();
                    g.shanchu(bianhao);
                }
                else if (caozuo == "4")
                {
                    break;
                }
                else 
                {
                    Console.WriteLine("您的输入有误！请重新输入！");
                }


            }

            Console.ReadKey();
        }
    }
}

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

namespace adoceshi.model
{
    public class Student
    {
        SqlConnection conn = null;
        SqlCommand cmd = null;
        public Student()
        {
           conn = new SqlConnection("server=.;database=adoceshi;user=sa;pwd=123;");
           cmd = conn.CreateCommand();
        }



        private string _Code;
        /// <summary>
        /// 学生编号
        /// </summary>
        public string Code
        {
            get { return _Code; }
            set { _Code = value; }
        }
        private string _Name;
        /// <summary>
        /// 学生姓名
        /// </summary>
        public string Name
        {
            get { return _Name; }
            set { _Name = value; }
        }
        private bool _Sex;
        /// <summary>
        /// 学生性别
        /// </summary>
        public bool Sex
        {
            get { return _Sex; }
            set { _Sex = value; }
        }

        public string strsex
        {
            get
            {
                if (_Sex == true)
                {
                    return "男";
                }
                else
                {
                    return "女";
                }
            }
        }

        private DateTime _Birthday;
        /// <summary>
        /// 学生生日
        /// </summary>
        public DateTime Birthday
        {
            get { return _Birthday; }
            set { _Birthday = value; }
        }

        public string strbirthday
        {
            get
            {
                return _Birthday.ToString("yyyy年MM月dd日");
            }
        }
        public int nianling
        {
            get
            {
                return
                (DateTime.Now.Year - _Birthday.Year);
            }
        }

        private string _SsubjectCode;
        /// <summary>
        /// 学生专业
        /// </summary>
        public string SsubjectCode
        {
            get { return _SsubjectCode; }
            set { _SsubjectCode = value; }
        }

        /// <summary>
        /// 专业名称
        /// </summary>
        public string SsubjectName
        {
            get
            {
                string name = "";
                cmd.CommandText = "select * from Ssubject where SsubjectCode=@c";
                cmd.Parameters.Clear();
                cmd.Parameters.Add("@c", _SsubjectCode);
                try
                {
                    conn.Open();
                    SqlDataReader dr = cmd.ExecuteReader();
                    if (dr.HasRows)
                    {
                        dr.Read();
                        name = dr["SsubjectName"].ToString();
                    }
                    conn.Close();
                }
                catch
                {
                    conn.Close();
                    Console.WriteLine("连接数据库失败！请重新输入！");
                }

                return name;
            }
        }
    }
}

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


namespace adoceshi.dataopration
{
    public class studentdata
    {
        SqlConnection conn = null;
        SqlCommand cmd = null;
        public studentdata()
        {
            conn = new SqlConnection("server=.;database=adoceshi;user=sa;pwd=123;");
            cmd = conn.CreateCommand();
        }


        public List<Student> selectall()
        {
            List<Student> list = new List<Student>();

            cmd.CommandText = "select * from Student";
            try
            {
                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.SsubjectCode = dr["SsubjectCode"].ToString();

                        list.Add(s);
                    }
                }
                conn.Close();
            }
            catch
            {
                conn.Close();
                Console.WriteLine("数据库连接失败！请重新连接！");
            }
            return list;

        }
        
        //用户操作
        //1新增
        public void xinzeng()
        {
            string code, name, zhuanye,zhuanyecode,s;
            bool sex;
            DateTime shengri;
            while (true)
            {
                Console.Write("请输入学生编号：");
                string c = Console.ReadLine();
                cmd.CommandText = "select * from student where  Code=@c";
                cmd.Parameters.Clear();
                cmd.Parameters.Add("@c",c);
                conn.Open();
                SqlDataReader dr = cmd.ExecuteReader();
                if (dr.HasRows)
                {

                    conn.Close();
                    Console.WriteLine("您输入的学生编号已拥有，请重新输入！");
                }
                else
                {

                    conn.Close();
                    code = c;
                    break;
                }
            }
            while (true)
            {
                Console.Write("请输入学生姓名（不能为空）：");
                string n = Console.ReadLine();
                if (n == "")
                {
                    Console.WriteLine("用户名不能为空！请重新输入！");
                }
                else
                {
                    name = n;
                    break;
                }
            }
            while (true)
            {
                Console.Write("请输入学生性别（男/女）：");
               s = Console.ReadLine();
                if (s == "男")
                {
                    sex = true;
                    break;
                }
                else if (s == "女")
                {
                    sex = false;
                    break;
                }
                else
                {
                    Console.WriteLine("您的输入有误！只能输入男或女，请重新输入！");
                }
            }
            while (true)
            {
                Console.Write("请输入学生生日（如2000/12/12）：");
                try
                {
                    DateTime ri = Convert.ToDateTime(Console.ReadLine());
                    shengri = ri;
                    break;
                }
                catch
                {
                    Console.WriteLine("您输入的生日格式不正确！请重新输入！");
                }
            }
            while (true)
            {
                Console.Write("请输入学生专业：");
                string z = Console.ReadLine();
                cmd.CommandText = "select * from Ssubject where SsubjectName like @n";
                cmd.Parameters.Clear();
                cmd.Parameters.Add("@n", "%"+z+"%");
              
                    conn.Open();
                    SqlDataReader dr = cmd.ExecuteReader();
                    if (dr.HasRows)
                    {
                        dr.Read();
                        zhuanye = dr["SsubjectName"].ToString();
                            zhuanyecode = dr["SsubjectCode"].ToString();
                        conn.Close();
                        break;
                    }
                    else
                    {
                        conn.Close();
                        Console.WriteLine("没有该专业！请重新输入！");
                    }
            }
            Console.WriteLine(code+"	"+name+"	"+s+"	"+shengri+"	"+zhuanye);
            while(true)
            {
            Console.Write("以上为新增学生的信息，是否确定添加？（Y/N）：");
            string queding = Console.ReadLine();
            if(queding=="y"||queding=="Y")
            {
                cmd.CommandText="insert into student values(@c,@x,@s,@b,@sub)";
                cmd.Parameters.Clear();
                cmd.Parameters.Add("@c",code);
                 cmd.Parameters.Add("@x",name);
                 cmd.Parameters.Add("@s",sex);
                 cmd.Parameters.Add("@b",shengri);
                 cmd.Parameters.Add("@sub",zhuanyecode);
                try
                {
                conn.Open();
                cmd.ExecuteNonQuery();
                conn.Close();
                Console.Clear();
                Console.WriteLine("添加成功！");
                    break;
                }
                catch
                {
                    Console.WriteLine("连接数据库失败！请重新连接！");
                }
            }
            else if(queding=="n"||queding=="N")
            {
                Console.Clear();
                break;
            }
            else
            {
                Console.WriteLine("输入不正确！请重新输入！");
            }
        }

        }
        //修改
        public void xiugai(string bianhao)
        {
            string code, name, zhuanye,zhuanyecode,ss;
            bool sex;
            DateTime shengri;
            cmd.CommandText = "select * from Student where Code=@c";
            cmd.Parameters.Clear();
            cmd.Parameters.Add("@c",bianhao);
                conn.Open();
                SqlDataReader dr = cmd.ExecuteReader();
                if (dr.HasRows)
                {
                    dr.Read();
                    Student s = new Student();
                        s.Name = dr["Name"].ToString();
                        s.Sex = Convert.ToBoolean(dr["Sex"]);
                        s.Birthday = Convert.ToDateTime(dr["Birthday"]);
                        s.SsubjectCode = dr["SsubjectCode"].ToString();

                        conn.Close();
                        Console.WriteLine("已查询到"+bianhao+"的学生信息，请进行以下修改：");
                        Console.WriteLine(bianhao+"	"+s.Name+"	"+s.Sex+"	"+s.Birthday+"	"+s.SsubjectCode);
                        
                        Console.WriteLine(""+bianhao+"学生当前姓名为："+s.Name+"");
                        while (true)
                        {
                            Console.Write("请输入修改后学生姓名（不能为空）：");
                            string n = Console.ReadLine();
                            if (n == "")
                            {
                                Console.WriteLine("用户名不能为空！请重新输入！");
                            }
                            else
                            {
                                name = n;
                                break;
                            }
                        }
                        Console.WriteLine("" + bianhao + "学生当前性别为：" + s.Sex + "");
                        while (true)
                        {
                            Console.Write("请输入您的修改学生性别（男/女）：");
                            ss = Console.ReadLine();
                            if (ss == "男")
                            {
                                sex = true;
                                break;
                            }
                            else if (ss == "女")
                            {
                                sex = false;
                                break;
                            }
                            else
                            {
                                Console.WriteLine("您的输入有误！只能输入男或女，请重新输入！");
                            }
                        }
                        Console.WriteLine("" + bianhao + "学生当前生日为：" + s.strbirthday + "");
                        while (true)
                        {
                            Console.Write("请输入修改学生生日（如2000/12/12）：");
                            try
                            {
                                DateTime ri = Convert.ToDateTime(Console.ReadLine());
                                shengri = ri;
                                break;
                            }
                            catch
                            {
                                Console.WriteLine("您输入的生日格式不正确！请重新输入！");
                            }
                        }
                        Console.WriteLine("" + bianhao + "学生当前专业编号为：" + s.SsubjectCode + "");
                        while (true)
                        {
                            Console.Write("请输入修改后的学生专业：");
                            string z = Console.ReadLine();
                            cmd.CommandText = "select * from Ssubject where SsubjectName like @n";
                            cmd.Parameters.Clear();
                            cmd.Parameters.Add("@n", "%" + z + "%");
                            try
                            {
                                conn.Open();
                                SqlDataReader dr1 = cmd.ExecuteReader();
                                if (dr1.HasRows)
                                {
                                    dr1.Read();
                                    zhuanye = dr1["SsubjectName"].ToString();
                                    zhuanyecode = dr1["SsubjectCode"].ToString();
                                    conn.Close();
                                    break;
                                }
                                else
                                {
                                    conn.Close();
                                    Console.WriteLine("没有该专业！请重新输入！");
                                }
                            }
                            catch
                            {
                                conn.Close();
                                Console.WriteLine("连接数据库失败！请重新连接！");
                            }
                        }
                        Console.WriteLine(bianhao+ name + "	" + sex + "	" + shengri + "	" + zhuanye);
                        while (true)
                        {
                            Console.Write("以上为修改学生的信息，是否确定添加？（Y/N）：");
                            string queding = Console.ReadLine();
                            if (queding == "y" || queding == "Y")
                            {
                                cmd.CommandText = " update Student set Name=@x,Sex=@s,Birthday=@b,SsubjectCode=@sub where Code='"+bianhao +"'";
                                cmd.Parameters.Clear();
                                cmd.Parameters.Add("@x", name);
                                cmd.Parameters.Add("@s", sex);
                                cmd.Parameters.Add("@b", shengri);
                                cmd.Parameters.Add("@sub", zhuanyecode);
                               conn.Open();
                                    cmd.ExecuteNonQuery();
                                    conn.Close();
                                    Console.Clear();
                                    Console.WriteLine("修改成功！");
                                    break;
           
                            }
                            else if (queding == "n" || queding == "N")
                            {
                                Console.Clear();
                                break;
                            }
                            else
                            {
                                Console.WriteLine("输入不正确！请重新输入！");
                            }
                        }
    
                }
                else
                {
                    Console.WriteLine("没有该学生的信息！请重新输入");
                }
        }
        //删除
        public void shanchu(string bianhao)
        {
            cmd.CommandText = "select * from Student where Code=@c";
            cmd.Parameters.Clear();
            cmd.Parameters.Add("@c",bianhao);
            conn.Open();
            SqlDataReader dr=cmd.ExecuteReader();
            if (dr.HasRows)
            {
                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.SsubjectCode = dr["SsubjectCode"].ToString();
                Console.WriteLine(bianhao + "	" + s.Name + "	" + s.Sex + "	" + s.Birthday + "	" + s.SsubjectCode);
                conn.Close();
                cmd.CommandText = "delete from student where Code=@cc";
                cmd.Parameters.Clear();
                cmd.Parameters.Add("@cc", bianhao);
                conn.Open();
                cmd.ExecuteNonQuery();
                conn.Close();
                Console.Clear();
                Console.WriteLine("删除成功！");
            }
            else
            {
                conn.Close();
                Console.WriteLine("没有该学生信息请重新输入");
            }

            conn.Close();
        }
    }
}