Solved

php mysql help, is it already in db?

Posted on 2009-07-05
4
194 Views
Last Modified: 2012-05-07
I need to see if an item is already in the database, I can do this:

--------------------------
$query = "SELECT * FROM oys_reg_users WHERE reg_email = '".$email."'";
$result = mysql_query($query);
$num_results = mysql_num_rows($result);
if ($num_results == 0) {
--------------------------

but it seems like there would be a more efficient way.... do I use count rows, or something else?  I just need to know if it already exists or not,

Thanks,  Chris
0
Comment
Question by:St_Aug_Beach_Bum
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
4 Comments
 
LVL 2

Accepted Solution

by:
Erbureth earned 500 total points
ID: 24780097
If you only want to verify whether the result exists, you could use
SELECT COUNT(*) FROM table WHERE oys_reg_users WHERE reg_email = '".$email."'";

which is a little bit faster, as it returns only the result count, instead of whole set of results.
0
 
LVL 5

Expert Comment

by:rizwanidrees
ID: 24780105
You should use COUNT(*) to make it little bit faster, however it is also fine
0
 

Author Closing Comment

by:St_Aug_Beach_Bum
ID: 31599918
Thank you both!  Appreciate the help :)
0
 
LVL 27

Expert Comment

by:Cornelia Yoder
ID: 24780217
If the reason you need to know whether it exists or not is so you can decide whether to INSERT or UPDATE, consider MySQL's REPLACE.
0

Featured Post

Technology Partners: We Want Your Opinion!

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

These days socially coordinated efforts have turned into a critical requirement for enterprises.
Introduction This article is intended for those who are new to PHP error handling (https://www.experts-exchange.com/articles/11769/And-by-the-way-I-am-New-to-PHP.html).  It addresses one of the most common problems that plague beginning PHP develop…
Learn how to match and substitute tagged data using PHP regular expressions. Demonstrated on Windows 7, but also applies to other operating systems. Demonstrated technique applies to PHP (all versions) and Firefox, but very similar techniques will w…
This tutorial will teach you the core code needed to finalize the addition of a watermark to your image. The viewer will use a small PHP class to learn and create a watermark.

705 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question