Message: mysql_affected_rows() [function.mysql-affected-rows]: A link to the server could not be established

[eluser]Suhas nazir[/eluser]
Hi all .I got an error message like this while working with codeigniter

"Message: mysql_affected_rows() [function.mysql-affected-rows]: A link to the server could not be established"
All the databse configurations are correct .can anyone help please..

[eluser]qq71[/eluser]
Is your db server on localhost? Are you using a persistent connection? In database.php

Code:

$db['default']['pconnect'] = TRUE;