刪除紀錄

1. 撰寫 deleterecord.php，刪除 tblphp 資料表的紀錄。

   [root@kvm3 ~]# vim /var/www/html/deleterecord.php
   [root@kvm3 ~]# cat /var/www/html/deleterecord.php
   <?php
   $dbhost = 'localhost:3306';
   $dbuser = 'root';
   $dbpass = '123qwe';
   $conn = mysqli_connect($dbhost, $dbuser, $dbpass) 
   	or die(mysqli_connect_error().PHP_EOL);
   mysqli_select_db( $conn, 'dywphp' )
   	or die('Error: '.mysqli_error($conn).PHP_EOL);
   $sql = "delete from tblphp where id=1";
   $retval = mysqli_query( $conn, $sql )
   	or die('Error: '.mysqli_error($conn).PHP_EOL);
   echo "Data Deleted successfully\n";
   mysqli_close($conn); 
   ?>
   

2. 先修改 selectrecord.php，將 where 條件移除。

   [root@kvm3 ~]# grep '^\$sql' /var/www/html/selectrecord.php
   $sql = "select id, title, author,submission_date from tblphp";
   

3. curl 連上網址 http://kvm3.deyu.wang/selectrecord.php，管線處理將 html 換行標籤 <br> 改成 shell 的換行符號 \n，網頁上列出資料表 tblphp 所有紀錄。

   [root@kvm3 ~]# curl -s http://kvm3.deyu.wang/selectrecord.php | sed 's/<br> */\n/g'
   Dywphp ID :1  
   Title: python 
   Author: David 
   Submission Date : 0000-00-00 
   --------------------------------
   Dywphp ID :2  
   Title: python 
   Author: dywang 
   Submission Date : 2020-01-29 
   --------------------------------
   Fetched data successfully
   

4. curl 連上網址 http://kvm3.deyu.wang/deleterecord.php，管線處理將 html 換行標籤 <br> 改成 shell 的換行符號 \n，網頁回應 'Data Deleted successfully'。

   [root@kvm3 ~]# curl -s http://kvm3.deyu.wang/deleterecord.php | sed 's/<br> */\n/g'
   Data Deleted successfully
   

5. curl 再連上網址 http://kvm3.deyu.wang/selectrecord.php，管線處理將 html 換行標籤 <br> 改成 shell 的換行符號 \n，網頁上列出資料表 tblphp 所有紀錄，id=1 的紀錄已不存在。

   [root@kvm3 ~]# curl -s http://kvm3.deyu.wang/selectrecord.php | sed 's/<br> */\n/g'
   Dywphp ID :2  
   Title: python 
   Author: dywang 
   Submission Date : 2020-01-29 
   --------------------------------
   Fetched data successfully