Member Avatar for antwan1986

Hi everyone and thanks for reading!

I have a MySQL database with a table called "lessons". Inside lessons there are about six or seven fields holding information about piano lessons. The table looks like this:

vid  	int(10) (Primary Key)
title 	varchar(50)
date 	date
teaser 	varchar(500)
description 	varchar(2000)
vurl 	varchar(50)
extra 	varchar(1000)

All I'm wanting to do is retrieve these values and place them where I'd like, so I know the code to do that through the SELECT statement WHERE vid = and then the paramater I pass in the URL.

At the moment I only have one record, so the vid=1 and this works fine. What I'm wanting to do is make a bit of PHP that stops people trying to access records that don't exist, like vid=33 and so on. At the moment it loads the page and displays no values (because there is no record 33!) but i'd rather it realised there was no record 33 and brought up a message saying sorry there is no such record. I've made one that catches if they've removed the ?vid like so:

$vid = $_GET['vid'];
if (!$vid) { echo "<h2>We've Encountered A Problem</h2>\n"; };
die;

Can anyone help me catch these records that don't exist?

Anthony

  • 2 Contributors
  • 2 Replies
  • 113 Views
  • 6 Hours Discussion Span
  • Latest Post Latest Post by antwan1986
Member Avatar for blocblue

Hey,

If you run the SQL select query to find a vid record, if it returns no rows, which you can find using mysql_num_rows(), display the error message.

R.

Member Avatar for antwan1986

Hey,

If you run the SQL select query to find a vid record, if it returns no rows, which you can find using mysql_num_rows(), display the error message.

R.

Hi and thanks for your quick reply. I looked that function and came up with the following, which works brilliantly.

if (mysql_num_rows($result) == 0) { die("Uh-oh.."); };

Thank you very much, you're a life saver.

Anthony

Be a part of the DaniWeb community

We're a friendly, industry-focused community of developers, IT pros, digital marketers, and technology enthusiasts meeting, networking, learning, and sharing knowledge.