using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Data.SqlClient;
namespace ConsoleApplication1
{
    class Program
    {

        private const string str = @"Data Source=.;Initial Catalog=MySchool;Integrated Security=True";

        static void Main(string[] args)
        {
            Program p = new Program();

            p.ss();
            p.caidan();
            p.GetudentAmount();
            Console.ReadLine();

        }
        public void ss() {
            Console.WriteLine("請輸入登入名:");
            string userName = Console.ReadLine();
            Console.WriteLine("請輸入密碼:");
            string pwd = Console.ReadLine();
            string strMsg = "用來儲存資訊";

            bool y = sss(userName, pwd, ref strMsg);

            if (y)
            {
                Console.WriteLine(strMsg);
            }
            else
            {
                Console.WriteLine("錯誤");
            }
        
        }
        public void caidan()
        {
            do
            {
                Console.WriteLine("=========請選擇操作鍵============");
                Console.WriteLine("1.統計學生人數");
                Console.WriteLine("2.檢視學生名單");
                Console.WriteLine("3.按學號查詢學生姓名");
                Console.WriteLine("4.按姓名查詢學生資訊");
                Console.WriteLine("5.修改學生出生日期");
                Console.WriteLine("6.刪除學生記錄");
                Console.WriteLine("7.新增年紀資訊");
                Console.WriteLine("8.退出");
                Console.WriteLine("====================================");

                int q = int.Parse(Console.ReadLine());
                switch (q)
                {
                    case 0:
                        break;
                    case 1:
                        GetudentAmount();
                        break;
                    case 2:
                        break;
                    case 3:
                        break;
                    case 4:
                        break;
                    case 5:
                        break;
                    case 6:
                        break;
                    case 7:
                        break;
                    case 8:
                        break;
                    default:
                        caidan();
                        break;
                }
            } while (true);
        }
        public bool sss(string userName, string pwd, ref string strMsg)
        {

            SqlConnection c = new SqlConnection(str);

            try
            {
                c.Open();
                string r = "SELECT COUNT(*) FROM [MySchool].[dbo].[Admin] where LoginId='" + userName + "'and LoginPwd='" + pwd + "'";
                Console.WriteLine(r);
                SqlCommand e = new SqlCommand(r, c);
                int i = (int)e.ExecuteScalar();
                if (i > 0)
                {
                    strMsg = "登陸成功,確實有這個資訊";
                    return true;
                }
            }
            catch (Exception ex)
            {
                strMsg = "登入失敗";
                Console.WriteLine(ex.Message);
                return false;
            }
            finally
            {
                Console.WriteLine("蘇琳琳大美女");
                c.Close();
            }
            return false;

        }

        public void  GetudentAmount() {
            SqlConnection conn = new SqlConnection(str);
            try
            {
                string strsql = "select count(*) from Student";
                conn.Open();
                SqlCommand comm = new SqlCommand(strsql,conn);
                int iret = (int)comm.ExecuteScalar();
                Console.WriteLine(iret);

            }
            catch (Exception ex)
            {
                Console.WriteLine(ex.Message);
            }
            finally {
                conn.Close();
            }
        
        }
    }
}