ADO.Net1

            SqlConnection Sql= new SqlConnection("server=.;database=bosamvs;user=sa;pwd=123456;");//连接数据库；
            SqlCommand stud = Sql.CreateCommand();//创建数据库操作命令；
            stud.CommandText="select*from student";//输入数据库操作命令；
            Sql.Open();//开启数据库；
            SqlDataReader reader = stud.ExecuteReader();//读取数据库内容
            if (reader.HasRows)//判断是否含有读取内容
            {
                while (reader.Read())//读取一行
                {
                    string date=Convert.ToDateTime(reader[2]).ToString("yyyy年MM月dd日");
                    string sex=((bool)reader[3])?"男":"女";
                    string grade=((decimal)reader[4]).ToString("#.##");
                    DateTime age = DateTime.Now;
                    DateTime birth =Convert.ToDateTime(reader[2]);
                    Console.WriteLine("学号：{0}；姓名：{1}；\t生日：{2}；年龄：{3}；性别：{4}；成绩：{5}；", reader[0], reader[1], date,age.Year-birth.Year, sex, grade);
                }
            }
            Sql.Close();//关闭数据库
            Console.ReadLine();

            #region 1.查询显示
            SqlConnection student = new SqlConnection("server=.;database=bosamvs;user=sa;pwd=123456;");//连接数据库
            SqlCommand cmd = student.CreateCommand();//创建数据库命令
            cmd.CommandText = "select*from student";//输入查询命令
            student.Open();//打开数据库
            SqlDataReader table = cmd.ExecuteReader();//读取数据库内容
            if (table.HasRows)//判断是否为空
            {
                while (table.Read())//读取一行
                {
                    string date = Convert.ToDateTime(table["Birth"]).ToString("yyyy年MM月dd日");
                    string sex = ((bool)table["Sex"]) ? "男" : "女";
                    string grade = ((decimal)table["Score"]).ToString("#.##");
                    Console.WriteLine("学号：{0}\t姓名：{1}\t生日：{2}\t性别：{3}\t成绩：{4}", table["Code"], table["Name"], date, sex, grade);
                }
            }
            student.Close();//关闭数据库
            #endregion
            for (int i = 1; i > 0;i++ )
            {
                #region 2.请输入你想要做的操作（1：添加，2：删除，3：修改）：
                Console.Write("请选择操作：1.添加数据；2.删除数据；3.修改数据。");//选择操作内容
                int num = int.Parse(Console.ReadLine());
                #region Add
                if (num == 1)//判断操作内容
                {
                    Console.WriteLine("请输入添加内容：");
                    Console.Write("请输入学号：");
                    string scode = Console.ReadLine();
                    Console.Write("请输入姓名：");
                    string sname = Console.ReadLine();
                    DateTime sbirth = DateTime.Now;
                    while(true)
                    {
                        try//判断输入日期格式
                        {
                            Console.Write("请输入生日：");
                            sbirth = Convert.ToDateTime(Console.ReadLine());
                            break;
                        }
                        catch
                        {
                            Console.Write("输入格式不对，请重新输入！");
                            Console.WriteLine();
                        }
                    }
                    Console.Write("请输入性别：");
                    string sex = Console.ReadLine();
                    bool ssex = false;
                    if (sex == "男")//将男，女赋bool值
                    {
                        ssex = Convert.ToBoolean("true");
                    }
                    else if (sex == "女")
                    {
                        ssex = Convert.ToBoolean("false");
                    }
                    Console.Write("请输入成绩：");
                    decimal sscore = decimal.Parse(Console.ReadLine());
                    SqlCommand cmdadd = student.CreateCommand();//创建数据库操作命令
                    cmdadd.CommandText = "insert into student values(" + scode + ",‘" + sname + "‘,‘" + sbirth + "‘,‘" + ssex + "‘," + sscore + ")";//输入添加命令
                    student.Open();
                    cmdadd.ExecuteNonQuery();//执行数据库命令
                    Console.Clear();//清屏
                    Console.WriteLine("添加成功！");
                    student.Close();
                }
                #endregion
                #region Delete
                else if (num == 2)
                {
                    Console.Write("请输入删除学生学号：");
                    string scode = Console.ReadLine();
                    SqlCommand cmddel = student.CreateCommand();
                    cmddel.CommandText = "delete from student where code=" + scode;//输入删除命令
                    try//判断命令是否执行成功
                    {
                        student.Open();
                        cmddel.ExecuteNonQuery();//执行命令
                        Console.Clear();
                        Console.WriteLine("删除成功！");
                    }
                    catch
                    {
                        Console.WriteLine("删除失败！");
                    }
                    finally
                    {
                        student.Close();
                    }
                }
                #endregion
                #region Update
                else if (num == 3)
                {
                    Console.WriteLine("请输入修改内容：");
                    Console.Write("请输入要修改的学号：");
                    string scode = Console.ReadLine();
                    Console.Write("请输入更改后的姓名：");
                    string sname = Console.ReadLine();
                    DateTime sbirth = DateTime.Now;
                    while (true)
                    {
                        try
                        {
                            Console.Write("请输入更改后的生日：");
                            sbirth = Convert.ToDateTime(Console.ReadLine());
                            break;
                        }
                        catch
                        {
                            Console.Write("输入格式不对，请重新输入！");
                            Console.WriteLine();
                        }
                    }
                    Console.Write("请输入更改后的性别：");
                    string sex = Console.ReadLine();
                    bool ssex = false;
                    if (sex == "男")
                    {
                        ssex = Convert.ToBoolean("true");
                    }
                    else if (sex == "女")
                    {
                        ssex = Convert.ToBoolean("false");
                    }
                    Console.Write("请输入更改后的成绩：");
                    decimal sscore = decimal.Parse(Console.ReadLine());
                    SqlCommand cmdadd = student.CreateCommand();
                    cmdadd.CommandText = "update student set Name=‘" + sname + "‘,Birth=‘" + sbirth + "‘,Sex=‘" + ssex + "‘,Score=" + sscore + "where Code=" + scode;//输入添加命令
                    student.Open();
                    cmdadd.ExecuteNonQuery();//执行命令
                    Console.Clear();
                    Console.WriteLine("修改成功！");
                    student.Close();
                }
                #endregion
                #endregion
                #region 3.提示用户操作是否成功，刷新数据，回到2等待用户操作
                cmd.CommandText = "select*from student";
                student.Open();
                SqlDataReader table1 = cmd.ExecuteReader();
                if (table1.HasRows)
                {
                    while (table1.Read())
                    {
                        string date = Convert.ToDateTime(table1["Birth"]).ToString("yyyy年MM月dd日");
                        string sex = ((bool)table1["Sex"]) ? "男" : "女";
                        string grade = ((decimal)table1["Score"]).ToString("#.##");
                        Console.WriteLine("学号：{0}\t姓名：{1}\t生日：{2}\t性别：{3}\t成绩：{4}", table1["Code"], table1["Name"], date, sex, grade);
                    }
                }
                student.Close();
                Console.WriteLine();
                #endregion
            }
            Console.ReadLine();