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Posted by Chris on 06/12/06 18:41
I'm working on some search engine code from devpapers.com and keep coming up
against an error when testing.
This is the error I get:
Warning: mysql_num_rows(): supplied argument is not a valid MySQL result
resource in c:\Inetpub\wwwroot\TMP8j9vfrf3s.php on line 36
Couldn't execute query
-------------------------------
These are lines 33 through 36:
$query = "SELECT * FROM links WHERE pageURL LIKE \"%$trimm%\" OR
pageDesc LIKE \"%$trimm%\" OR pageTitle LIKE \"%$trimm%\" ORDER BY pageLink
DESC" ;
// Execute the query to get number of rows that contain search
keywords
$numresults = mysql_query($query);
$row_num_links_main = mysql_num_rows($numresults);
-----------------------------------
I'm guessing it's a simple syntax error and I just can't see it after
looking at it so long, so maybe a different set of eyes will see it.
Chris
----------------
This is the full code (in case you're still reading and need to see the
whole thing):
<?php
require_once('Connections/website.php');
//specify how many results to display per page
$limit = 10;
// Get the search variable from URL
$var = @$_GET['q'] ;
//trim whitespace from the stored variable
$trimmed = trim($var);
//separate key-phrases into keywords
$trimmed_array = explode(" ",$trimmed);
// check for an empty string and display a message.
if ($trimmed == "") {
$resultmsg = "<p>Search Error</p><p>Please enter a search...</p>" ;
}
// check for a search parameter
if (!isset($var)){
$resultmsg = "<p>Search Error</p><p>We don't seem to have a search
parameter! </p>" ;
}
// Build SQL Query for each keyword entered
foreach ($trimmed_array as $trimm){
// EDIT HERE and specify your table and field names for the SQL query
$query = "SELECT * FROM links WHERE pageURL LIKE \"%$trimm%\" OR
pageDesc LIKE \"%$trimm%\" OR pageTitle LIKE \"%$trimm%\" ORDER BY pageLink
DESC" ;
// Execute the query to get number of rows that contain search
keywords
$numresults = mysql_query($query);
$row_num_links_main = mysql_num_rows($numresults);
// next determine if 's' has been passed to script, if not use 0.
// 's' is a variable that gets set as we navigate the search result
pages.
if (empty($s)) {
$s=0;
}
// now let's get results.
$query .= " LIMIT $s,$limit" ;
$numresults = mysql_query ($query) or die ( "Couldn't execute
query" );
$row= mysql_fetch_array ($numresults);
//store record id of every item that contains the keyword in the array
we need to do this to avoid display of duplicate search result.
do{
//EDIT HERE and specify your field name that is primary key
$adid_array[] = $row[ 'pageID' ];
}while( $row= mysql_fetch_array($numresults));
} //end foreach
if($row_num_links_main == 0 && $row_set_num == 0){
$resultmsg = "<p>Search results for:" . $trimmed ."</p><p>Sorry, your
search returned zero results</p>" ;
}
//delete duplicate record id's from the array. To do this we will use
array_unique function
$tmparr = array_unique($adid_array);
$i=0;
foreach ($tmparr as $v) {
$newarr[$i] = $v;
$i++;
}
// now you can display the results returned. But first we will display the
search form on the top of the page
?>
<form action="search.php" method="get" name="search">
<div align="center">
<input name="q" type="text" value=" <?php echo $q; ?> " size="15">
<input name="search" type="submit" value="Search">
</div>
</form>
<?php
// display what the person searched for.
if( isset ($resultmsg)){
echo $resultmsg;
exit();
}else{
echo "Search results for: " . $var;
}
foreach($newarr as $value){
// EDIT HERE and specify your table and field names for the SQL query
$query_value = "SELECT * FROM links WHERE pageID = '$value'";
$num_value=mysql_query ($query_value);
$row_linkcat= mysql_fetch_array ($num_value);
$row_num_links= mysql_num_rows ($num_value);
//now let's make the keywords bold. To do that we will use preg_replace
function.
//EDIT parts of the lines below that have fields names like $row_linkcat[
'field1' ]
//This script assumes you are searching only 3 fields. If you are searching
more fileds make sure that add appropriate line.
$titlehigh = preg_replace ( "'($var)'si" , "<b>\\1</b>" , $row_linkcat[
'pageURL' ] );
$linkhigh = preg_replace ( "'($var)'si" , "<b>\\1</b>" , $row_linkcat[
'pageDesc' ] );
$linkdesc = preg_replace ( "'($var)'si" , "<b>\\1</b>" , $row_linkcat[
'pageTitle' ] );
foreach($trimmed_array as $trimm){
if($trimm != 'b' ){
//IF you added more fields to search make sure to add them below as well.
$titlehigh = preg_replace( "'($trimm)'si" , "<b>\\1</b>" ,
$titlehigh);
$linkhigh = preg_replace( "'($trimm)'si" , "<b>\\1</b>" ,
$linkhigh);
$linkdesc = preg_replace( "'($trimm)'si" , "<b>\\1</b>" ,
$linkdesc);
}
//end highlight
?>
<p>
<?php echo $titlehigh; ?><br>
<?php echo $linkhigh; ?><br>
<?php echo $linkhigh; ?>
</p>
<?php
} //end foreach $trimmed_array
if($row_num_links_main > $limit){
// next we need to do the links to other search result pages
if ($s>=1) { // do not display previous link if 's' is '0'
$prevs=($s-$limit);
echo "<div align='left'><a
href='$PHP_SELF?s=$prevs&q=$var&catid=$catid'>Previous " .$limit.
"</a></div>";
}
// check to see if last page
$slimit =$s+$limit;
if (!($slimit >= $row_num_links_main) && $row_num_links_main!=1) {
// not last page so display next link
$n=$s+$limit;
echo "<div align='right'><a
href='$PHP_SELF?s=$n&q=$var&catid=$catid'>Next " .$limit. "</a></div>";
}
}
} //end foreach $newarr
?>
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