連線資料庫,並從資料庫中讀取資料後並輸出!

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Data.SqlClient;

namespace Login
{
    class Program
    {
        static void Main(string[] args)
        {
            //新建一個數據庫連線
            using(SqlConnection conn = new SqlConnection(GetConnectString()))
            {
                conn.Open();//開啟資料庫
                //Console.WriteLine("資料庫開啟成功!");
                //建立資料庫命令
                SqlCommand cmd = conn.CreateCommand();
                //建立查詢語句
                cmd.CommandText = "SELECT * FROM userinfo";
                //從資料庫中讀取資料流存入reader中
                SqlDataReader reader = cmd.ExecuteReader();               
                
                //從reader中讀取下一行資料,如果沒有資料,reader.Read()返回flase
                while (reader.Read())
                {
                    //reader.GetOrdinal("id")是得到ID所在列的index,
                    //reader.GetInt32(int n)這是將第n列的資料以Int32的格式返回
                    //reader.GetString(int n)這是將第n列的資料以string 格式返回
                    int id = reader.GetInt32(reader.GetOrdinal("id"));
                    string name = reader.GetString(reader.GetOrdinal("name"));
                    string pwd = reader.GetString(reader.GetOrdinal("password"));
                    int age = reader.GetInt32(reader.GetOrdinal("age"));
                    string sex = reader.GetString(reader.GetOrdinal("sex"));
                    string phone = reader.GetString(reader.GetOrdinal("phone"));
                    string address = reader.GetString(reader.GetOrdinal("Address"));

                    //格式輸出資料
                    Console.Write("ID:{0},Name:{1},PWD:{2},Age:{3},Sex:{4},Phone{5},Address:{6}\n", id, name, pwd, age, sex, phone, address);
                }
            }
            Console.ReadKey();
        }
        //得到一個數據庫連線字串
        static string GetConnectString()
        {
            return "Data Source=(local);Initial Catalog=db1;Integrated Security=SSPI;";
        }
    }
}