Solved

PHP Warning:  mysql_fetch_assoc() expects parameter 1 to be resource, boolean given...

Posted on 2011-03-12
2
1,276 Views
Last Modified: 2012-05-11
I am working on a recently-inherited legacy database.  One of the tables is structured in a way that is unsuitable for its purpose, so I need to take the data and place it in another table that is suitable.

I have created the new table: four TINYINT columns that will be set either as 0 (default) or 1.  A sufficient number of rows exists showing default values.  I intend to update each row by scrolling through the relevant data from the old table.

Unfortunately, I can't loop through the data because I keep getting the warning above (it's the same with mysql_fetch_array).

The query is good: if I cut and paste it into phpMyAdmin I get c.39,000 rows returned, as expected.

The connection is good: it's all handled by the same includes used in the working system.  To check, I have added error-handling from the working pages, and that reports no errors.

The PHP version of the query seems to be good - if I comment out the while() loop and substitute print_r, it tells me that the mysql_query is returning Resource id #5.

But the loop doesn't loop.  It puts values from the first row retrieved into $ue and $hpc; and it does update the correct row in the new table as it should.  But that's it (apart from throwing the Warning above).

	//Retrieve relevant contents of original table
	$sql = mysql_query("SELECT `user_entry_FK`, `hpc_standard_FK` FROM member_standards ORDER BY `user_entry_FK`");
//	print_r ($sql);

	//Amend fields in target table
 	while ( $array  = mysql_fetch_assoc($sql) ) {
 		$ue = $array['user_entry_FK'];
 		$hpc = $array['hpc_standard_FK'];
 		switch ($hpc) {
 			case 1:
 			$sql = mysql_query ("UPDATE user_HPC SET `hpc1` = 1 WHERE `enid_FK` =$ue");
 			break;
 
 			case 2:
 			$sql = mysql_query ("UPDATE user_HPC SET `hpc2` = 1 WHERE `enid_FK` =$ue");
 			break;
 
 			case 3:
 			$sql = mysql_query ("UPDATE user_HPC SET `hpc3` = 1 WHERE `enid_FK` =$ue");
 			break;
 
 			case 4:
 			$sql = mysql_query ("UPDATE user_HPC SET `hpc4` = 1 WHERE `enid_FK` =$ue");
 			break;
 		}
 	}

Open in new window


Where am I going wrong?
0
Comment
Question by:hnmcc
[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
2 Comments
 
LVL 34

Accepted Solution

by:
Beverley Portlock earned 500 total points
ID: 35116196
Your are storing the resource ID in $sql on line 2 of the fragment above. Inside the loop you then assign $sql a new value based on the UPDATE query thus wiping out your resource ID.

Assign the queries in the loop to some other variable. For UPDATE queries only TRUE or FALSE is returned, not a resource id so on the next loop iteration $sql contain a boolean which throws the error message.
0
 

Author Closing Comment

by:hnmcc
ID: 35116233
Well it's obvious - once someone points it out...
0

Featured Post

PeopleSoft Has Never Been Easier

PeopleSoft Adoption Made Smooth & Simple!

On-The-Job Training Is made Intuitive & Easy With WalkMe's On-Screen Guidance Tool.  Claim Your Free WalkMe Account Now

Question has a verified solution.

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

Suggested Solutions

Foreword (July, 2015) Since I first wrote this article, years ago, a great many more people have begun using the internet.  They are coming online from every part of the globe, learning, reading, shopping and spending money at an ever-increasing ra…
3 proven steps to speed up Magento powered sites. The article focus is on optimizing time to first byte (TTFB), full page caching and configuring server for optimal performance.
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.
The viewer will learn how to create a basic form using some HTML5 and PHP for later processing. Set up your basic HTML file. Open your form tag and set the method and action attributes.: (CODE) Set up your first few inputs one for the name and …

710 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