将列值复制到同一表中的另一列

Question

I'm trying to copy title column to keywords column in database, so the keywords will be inserted automatically from the title.

http://store2.up-00.com/2015-06/1435609110941.png

I want to add comma ', ' before each word for example.

" It's my first program "   

it will turn into

" It's, my, first, program, "

This the code I wrote.

<?php

  // $id =mysql_insert_id;
  $select_posts = mysql_query("SELECT * FROM `posts`");

  while($row = mysql_fetch_array($select_posts)){
        $id  = $row['post_id'];
        $text =  $row['post_title'];  

       $delim = ' \n\t,.!?:;';
       $tok = strtok($text, $delim);


    while ( $tok !== false){
          echo $tok1 = $tok.',';
          mysql_query("UPDATE `posts` SET  `post_keywords` =  '$tok1' WHERE `post_id` = $id  ");
          $tok = strtok($delim);
        }   
}

?>    

it insert the last word in each title column , because the words is overwritten by while loop.

Please help me .

Answer 1

Concat the values:

... SET post_keywords = CONCAT(post_keywords, '$tok1')

and note that you're vulnerable to sql injection attacks . Just because that $tok1 value came out of a database doesn't mean it's safe to REUSE in a query...

Answer 2

您可以通过一个查询来完成：

UPDATE `posts` SET post_keywords = REPLACE(post_title, ' ', ',');