isError ADODB

Hi all, I've been trying to start using ADOdb instead of PEAR and I've
ran into a snag.. I cannot figure out the equivalent of "isError" in
ADOdb, does anyone know?
 
class DbManager {
  public $db;
  
  //open and close the database connection in the constructor
  function __construct($connectionString) {
    $this->db = NewADOConnection($connectionString,
USE_PERSISTANT_CONNECTIONS);
    
    If(isError($this->db))

<---Line 16 ---->>>>> trigger_error($this->db->getMessage(), 

E_USER_ERROR);
      $this->db->setFetchMode(ADODB_FETCH_ASSOC);
  }


<---Here's the Error I get --->

Fatal error: Call to undefined function isError()
in /home/david/www/wam/include/database.php on line 16 

-- 
David M.


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