C#連接SQL Server數據庫的四種方式

 

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

namespace ADONET
{
    class Program
    {
        static void Main(string[] args)
        {
           //【1】windows認證模式：
            // String strCon = "Data Source=localhost;Initial Catalog=SIMS;Integrated Security=true";

            //【2】SQLSERVER認證模式：
            //String strCon = "Data Source=.;Initial Catalog=SIMS;User Id=sa;Password=";

            //【3】通過工具生成連接字符串
            //String strCon = "Data Source=穆嶺-PC;Initial Catalog=SIMS;Persist Security Info=True;User ID=sa Password=";

            //【4】通過連接字符串生成器生成
            SqlConnectionStringBuilder scsb = new SqlConnectionStringBuilder();
            scsb.DataSource = ".";
            scsb.InitialCatalog = "SIMS";
            scsb.UserID = "sa";
            scsb.Password = "";
            String strCon = scsb.ConnectionString;  //得到連接字符串

            SqlConnection con = null;
            SqlCommand com = null;
            SqlDataReader sdr = null;
            try
            {
                con = new SqlConnection(strCon);
                com = con.CreateCommand();
                com.CommandText = "SELECT cname FROM Course";
                con.Open();
                sdr = com.ExecuteReader();
                while (sdr.Read())
                {
                    Console.WriteLine(sdr[0]);
                }
            }catch(Exception e){
                Console.WriteLine(e.Message);
            }finally{
                sdr.Close();
                com.Clone();
                con.Close();
            }
            Console.ReadKey();
        }
    }
}