mysqli面向过程练手

 1 代码:
 2 //1.得到mysqli连接
 3        header("Content-type: text/html;charset=utf-8");
 4        $mysqli=mysqli_connect("localhost","root","root","test");
 5        if(!$mysqli){
 6               die("连接失败".mysqli_connnect_error($mysqli));
 7        }
 8        //2.向数据库发送sql语句(ddl,dml dql ...)
 9        $sql="select * from user1";
10        $res=mysqli_query($mysqli,$sql);
11        //var_dump($res);
12        //3.处理得到的结果
13        //循环取出$res中的数据mysqli_fetch_row mysql_fetch_row
14        while($row=mysqli_fetch_row($res)){
15               
16               foreach($row as $key=>$val){
17                      echo "--$val";
18               }
19               echo "<br/>";
20        }
21        //4.关闭资源
22        mysqli_free_result($res);
23        mysqli_close($mysqli);