I'm building a classified website but each category has its own fields, In place an add page when I'm generating the fields an error appeared
NULL
Warning: mysql_fetch_array(): supplied argument is not a valid MySQL result resource in /Applications/MAMP/htdocs/test.com/inc/db.inc.php on line 36
this is the function i used
function getCategoryFieldsById($cid)
{
$sql = "select * from fields where categoryID = $cid order by fi_order";
$result = $this->query($sql);
$no = $this->getNumRows($result);
if($no)
{ return $result; }
else
{
$pid = $this->getParentId($cid);
if($pid)
$this->getCategoryFieldsById($pid);
else
return 0;
}
}
the problem is return NULL on behalf of the DB rows, I can print the $no and see there are 14 rows but when go inside if() it can't see the number
select * from fields where categoryID = 35 order by fi_order
0
select * from fields where categoryID = 34 order by fi_order
0
select * from fields where categoryID = 1 order by fi_order
14
NULL
Warning: mysql_fetch_array(): supplied argument is not a valid MySQL result resource in /Applications/MAMP/htdocs/izomart.com/inc/db.inc.php on line 36
this is my MySQL functions
function query($query) {
$this->theQuery = $query;
$result=mysql_query($query) or print(mysql_error());
return $result;
}
function getNumRows($result){
return mysql_num_rows($result);
}