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unknown result resource with mysql_num_rows

The1corrupted
134 New Member
Okay, this has blown my entire perception of reality way out of order. First, a page was working and not five minutes later, I get this error,


Warning: mysql_num_rows( ): supplied argument is not a valid MySQL result resource in C:\Vardaes\gend isp.php on line 66

and I made insignificant changes to the script before hand that had nothing to do with mysql_num_rows( );...

Here's line 66
[PHP]
$saynum=mysql_n um_rows(mysql_q uery("SELECT `cn` FROM `user_table` WHERE `cn`='$mesgread[2]' AND `ns`=$x AND `ew`=$y AND `ud`=$z"));
[/PHP]
Mar 6 '07 #1
3 1587
ronverdonk
4,258 Recognized Expert Specialist
When the select fails for whatever reason you do not get an object to query the no of rows. So it is better to run the query first and capture the errors and only then get the row count. Like this:

Expand|Select|Wrap|Line Numbers
  1. $res = mysql_query("SELECT `cn` FROM `user_table` 
  2.                     WHERE cn`='$mesgread[2]' 
  3.                     AND `ns`=$x 
  4.                     AND `ew`=$y 
  5.                     AND `ud`=$z");
  6.    or die ("Select error: ".mysql_error());
  7. $saynum=mysql_num_rows($res); 
Ronald :cool:
Mar 6 '07 #2
The1corrupted
134 New Member
Thanks, and I've found the errors so everything's working fine now.
Mar 6 '07 #3
ronverdonk
4,258 Recognized Expert Specialist
You are welcome any time.

Ronald :cool:
Mar 6 '07 #4

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