Question

I get a Warning: mysql_affected_rows() expects parameter to be resource, boolean give in c:\program files\EasyPHP……line 71.

when i check the database the row is updated, but i still get this error message

line 71 is if ($duplicates < 0);

 $query = mysql_query("UPDATE courses 
  SET   
  course_code = '".$course_code."', 
  course_title = '".$course_title."' ,  
  course_unit = '".$course_unit."'   
  WHERE
  course_code = '".$course_code."'") 
  or die(mysql_error()); 

 $duplicates = mysql_affected_rows($query);
            if ($duplicates > 0)  


 echo"<div id=\"contentRight\">";
 echo"<idv id=\"msg\">" ;                             echo "You have a updated one Course " ;

  echo"</div>" ;
  echo"</div>" ;
   exit();

Answer 1

Unlike many other mySQL functions, mysql_affected_rows() doesn’t take a query resource as the first parameter: It returns the number of affected rows in the last operation, no matter when that happened.

int mysql_affected_rows ([ resource $link_identifier ] )

What you can pass to it optionally is the database connection resource. But that’s necessary only when you deal with more than one of them.