Chapter 1. Ado.Net 数据库数据查询（多行、多列）

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Data.SqlClient;  //引用命名空间

namespace Ado.net数据库增删改查
{
    class Program
    {
        static void Main(string[] args)
        {
            //1、数据库连接
            SqlConnection conn = new SqlConnection("server=.;database=ADO;user=sa;pwd=ray;");

            //2、数据库操作
            SqlCommand cmd = conn.CreateCommand();
            cmd.CommandText = "select * from Student";

            //3、数据库连接通道开启
            conn.Open();

            //4、数据库执行
            SqlDataReader drc = cmd.ExecuteReader();
            if (drc.HasRows)
            {
                while (drc.Read())
                {
                    string gender = ((bool)drc[2]) ? "男" : "女";
                    int age=DateTime.Now.Year-Convert.ToDateTime(drc[3]).Year;
                    string birthday=Convert.ToDateTime(drc[3]).ToString("yyyy年MM月dd日");
                    string score=Convert.ToDecimal(drc[4]).ToString("#.##");
                    Console.WriteLine
                        ("学号：{0}，姓名：{1}，性别：{2}，年龄：{3}，生日：{4}，分数：{5}"
                        ,drc[0],drc[1],gender,age,birthday,score);
                }
            }

            //5、数据库连接通道关闭
            conn.Close();

            Console.ReadKey();
        }
    }
}