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Resource id #3 - no data from simple queries

Posted by JimL (JimL), 28 January 2004
I am working with a MySQL database and am writing simple queries to extract data from it. However, when I print out the results of the queries all I am getting are the following values:

Resource id #3
Resource id #4
Resource id #5

Here is my code:

<?php

mysql_connect("localhost","adminuser","adminpass") or die ("Could not connect: " . mysql_error());

mysql_select_db("osirispwd") or die ("Could not select db: " . mysql_error());

$uniresult = mysql_query("SELECT uni_card_no FROM tbl_osiris WHERE uni_card_no = \"$unicardnum\"");

print("Uniresult: $uniresult<br>");

?>

Any ideas anyone?

Cheers,  Jim

Posted by Chris_Isaac (Chris Isaac), 28 January 2004
Hi

I tried something similar on something I'm working on, 2 things I did differently to get mine to work were:

1. on the following line:
Code:
$uniresult = mysql_query("SELECT uni_card_no FROM tbl_osiris WHERE uni_card_no = \"$unicardnum\"");


I changed the '=' to a like statement, but I'm using parts of strings, not numbers.

also to print out I put in the following:

Code:
while($row=mysql_fetch_array($uniresult)) {
                 echo("Uniresult: - ".$row["uni_card_no"]."<br>");}


hope this helps.

Posted by admin (Graham Ellis), 29 January 2004
Hi, Jim, welcome ...

Chris is basically heading you in the right direction.

mysql_query returns a reference to a result set rather than the result set itself, so you get rubbish if you print it out.   You need to call a function such as mysql_fetch_array or mysql_fetch_assoc to read a result itself from the result set object (and what you get will be an array).   If your query can return more that 1 row, keep calling it until there are no more rows to get back.

In many ways, a result set is like a file handle that you read from, and just like a file handle it's used to let you iterate over what can be a huge data set in easy steps rather than having you presented with too much data all at the same time  

Posted by JimL (JimL), 29 January 2004
Ahh!

All becomes clear!

I now remember that we used mysql_fetch_assoc() on the PHP course.

Thanks for clarifying this for me!

Cheers,  Jim



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