'PDOExecption'，消息'SQLSTATE [42000] [1044]'Accesase被拒绝

Hi i am new in PDO connection when i am useing PDO connection i got that error

exception 'PDOExecption ' with message 'SQLSTATE[42000] [1044]' Accesase s denied for user ' '@localhost to database 'dev2anal_calltrack','root,' 'in that file'

global $DB_HOST,$DB_NAME,$DB_USER,$DB_PASS;
$this->db = new Real_PDO("mysql:host=localhost;dbname=dev2anal_calltrack,root,");
$this->db->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);

normally root have all permission and i also check that ..

Should be:

$this->db = new Real_PDO("mysql:host=localhost;dbname=dev2anal_calltrack", 'root');

Misplaced comma.

new Real_PDO("mysql:host=localhost;dbname=dev2anal_calltrack",'root');
                                          move a quote here ^