affected rows become -1

[eluser]max123[/eluser]
I ueds

Code:

$this->db->affeted_rows()

function

why does it gives '-1' when data is not inserted in to the database

[eluser]Phil Sturgeon[/eluser]

Returns the number of affected rows on success, and -1 if the last query failed.

http://uk2.php.net/mysql_affected_rows

[eluser]max123[/eluser]
ok thanx. I wondered y it doesn't return 0