class Program
    {
        static void Main(string[] args)
        {
            //数据库的增删改查
            string MySqlStr = "Database=vr88;server=localhost;User Id=root;Password=;";

            MySqlConnection mySqlcon = new MySqlConnection(MySqlStr);//连接数据库；
            mySqlcon.Open();

            //查
            string str = "select * from student where sid=3;";
            MySqlCommand mySqlCom = new MySqlCommand(str, mySqlcon);
            CheckedMySql(mySqlCom);

            //增
            str = "insert into student values(15,'神10',28,'女');";
            mySqlCom = new MySqlCommand(str, mySqlcon);
            IducMySql(mySqlCom);

            //删            
            str = "delete from student where sid=5;";
            mySqlCom = new MySqlCommand(str, mySqlcon);
            IducMySql(mySqlCom);

            // 改
            str = "update student set sage=33 where sid=9;";
            mySqlCom = new MySqlCommand(str, mySqlcon);
            IducMySql(mySqlCom);

            GetId(9);

            Console.ReadKey();
        }

        //(查)
        static private void CheckedMySql(MySqlCommand mySqlcom)
        {
            MySqlDataReader read = mySqlcom.ExecuteReader();
            try
            {
                while (read.Read())
                {

                    if (read.HasRows)//查找
                    {
                        Console.WriteLine("ID:{0} 姓名：{1} 年龄：{2} 性别：{3}", read.GetInt32(0), read.GetString(1), read.GetInt32(2), read.GetString(3));
                    }

                }

            }
            catch (Exception e)
            {

                throw e;
            }
            finally
            {
                read.Close();
            }



        }


        //增 删 改 查
        static private void IducMySql(MySqlCommand mySqlcom)
        {
            try
            {
                mySqlcom.ExecuteNonQuery();
            }
            catch (Exception e)
            {

                throw e;
            }

        }


        //指定ID参数打印相关信息
        static private void GetId(int id)
        {

            string MySqlStr = "Database=vr88;server=localhost;User Id=root;Password=;";
            MySqlConnection mySqlcon = new MySqlConnection(MySqlStr);
            mySqlcon.Open();
            string str = "select * from student where sid=" + id;//注意 别把分号打上去；
            MySqlCommand mySqlCom = new MySqlCommand(str, mySqlcon);
            MySqlDataReader reader = mySqlCom.ExecuteReader();
            try
            {
                while (reader.Read())
                {

                    if (reader.HasRows)//查找
                    {
                        Console.WriteLine("ID:{0} 姓名：{1} 年龄：{2} 性别：{3}", reader.GetInt32(0), reader.GetString(1), reader.GetInt32(2), reader.GetString(3));
                    }

                }

            }
            catch (Exception e)
            {

                throw e;
            }
            finally
            {
                reader.Close();
            }
        }
    }