一、Sql Server 在Visual Studio的连接有两种方法：

 

（1）本地计算机连接;

 

string s = "Data Source=计算机名称;initial Catalog=数据库名称;integrated Security=True";

 

 

（2）windows身份验证方式连接;

 

string cc="Data Source = 计算机名称; Initial Catalog = 数据库名称; User ID = sa; Password = 你的密码";

 

 

二、在Visual Studio中使用：

例1：查询数据库中的数据并且显示出来

 

string s = "Data Source=计算机名称;Initial Catalog=数据库名称;Integrated Security=True";  //此处使用本地计算机连接方式
            SqlConnection conn = new SqlConnection(s);   //创建连接
            conn.Open();    //打开连接
            SqlCommand cmd = conn.CreateCommand();
            cmd.CommandText = "select * from T_User";   //使用命令
            SqlDataAdapter adapter=new SqlDataAdapter(cmd);
            DataTable dt=new DataTable();
            adapter.Fill(dt);

            conn.Dispose();  //释放所以资源
            cmd.Dispose();
            conn.Close();  //关闭连接
            string realname="";
            string username="";
            string mobile="";
            string address="";
            for (int i=0;i<dt.Rows.Count;i++)
            {
                realname=dt.Rows[i][3].ToString();
                username=dt.Rows[i][1].ToString();
                mobile=dt.Rows[i][4].ToString();
                address=dt.Rows[i][5].ToString();
                Console.WriteLine("姓名为{0},用户名为{1}，手机为{2},地址为{3}", realname, username, mobile, address);
            }
            Console.ReadKey();

例2：删除表中数据

 

 

string cc="Data Source = 计算机名称; Initial Catalog = 数据库名称; User ID = sa; Password = 你的密码";   //使用windows身份验证
SqlConnection conn = new SqlConnection(s);
conn.Open();
SqlCommand cmd = conn.CreateCommand();
cmd.CommandText = "delete from T_User where Id=5";
cmd.ExecuteNonQuery();

cmd.Dispose();
conn.Close();
Console.WriteLine("删除成功");
Console.ReadKey();

 

例3：修改表中数据

 

string s = "Data Source=计算机名称;initial Catalog=数据库名称;integrated Security=True";
SqlConnection conn = new SqlConnection(s);
conn.Open();
SqlCommand cmd = conn.CreateCommand();
cmd.CommandText = "update T_User set Card=@card where ID=3";
cmd.Parameters.AddWithValue("@card", "13000000000000");
cmd.ExecuteNonQuery();
cmd.Dispose();
conn.Close();
conn.Dispose();
Console.WriteLine("修改成功！");
Console.ReadKey();

 

 

例4：向表中插入数据

 

               string s = "data source=计算机名称;initial catalog=数据库名称;integrated security=true";          SqlConnection conn = new SqlConnection(s);          conn.Open();          SqlCommand cmd = conn.CreateCommand();          cmd.CommandText = "insert into T_User(UserName,Password,RealName,Mobile,Address) values(@username,@password,@realname,@mobile,@address)";          cmd.Parameters.AddWithValue("@username", "xingxing");          cmd.Parameters.AddWithValue("@password", "77777");          cmd.Parameters.AddWithValue("@realname", "星星");          cmd.Parameters.AddWithValue("@mobile", 1300000000);          cmd.Parameters.AddWithValue("@address", "河北省北京市");          cmd.ExecuteNonQuery();          cmd.Dispose();          conn.Close();          conn.Dispose();          Console.WriteLine("成功插入一行");          Console.ReadKey();
string s = "data source=计算机名称;initial catalog=数据库名称;integrated security=true";
SqlConnection conn = new SqlConnection(s);
conn.Open();
SqlCommand cmd = conn.CreateCommand();
cmd.CommandText = "insert into T_User(UserName,Password,RealName,Mobile,Address) values(@username,@password,@realname,@mobile,@address)";
cmd.Parameters.AddWithValue("@username", "xingxing");
cmd.Parameters.AddWithValue("@password", "77777");
cmd.Parameters.AddWithValue("@realname", "星星");
cmd.Parameters.AddWithValue("@mobile", 1300000000);
cmd.Parameters.AddWithValue("@address", "河北省北京市");
cmd.ExecuteNonQuery();
cmd.Dispose();
conn.Close();
conn.Dispose();
Console.WriteLine("成功插入一行");
Console.ReadKey();