using System;using System.Data.SqlClient;namespace CommandDemo{  class Program  {    static void Main(string[] args)    {      //創建數據庫      string constr = "Server = .; user=name;pwd=mima;database=mysql";      SqlConnection myCon = new SqlConnection(constr);      try      {        myCon.Open();        /*創建一個表        string sql = "select * form mytable01";        SqlCommand myCom = new SqlCommand(sql, myCon);        myCom.CommandTimeout = 2; //出錯的等待時間，2s內沒有成功就認為出錯了         Console.WriteLine("創建對象成功");*/        /*-------更改數據 ExcuteNonquery 插入語句舉例----------        myCon.Open();        //添加數據        string sql = "insert mytable01(name,gender,age,department)values('姓名'，'男'，35,'部門')";        SqlCommand myCom = new SqlCommand(sql, myCon);        myCom.ExecuteNonQuery();        Console.WriteLine("去數據庫查看，已完成");        */        //ExcuteScalar  獲得最大值舉例        myCon.Open();        string sql = "select max(age) from mytable01";        SqlCommand myCom = new SqlCommand(sql,myCon);        Console.WriteLine("年齡最大的是："+myCom.ExecuteScalar()+"歲");      }      catch(Exception ex)      {        Console.WriteLine(ex.Message.ToString());      }      finally      {        myCon.Close();      }      Console.Read();    }  }}