sammligning af strenge PHP mod PostGresSQL

Jeg sidder og skal sammenligne noget data der er tastet
ind i en html formular med noget data hentet fra en PGSQL data base.

kode:

$loginName = $_REQUEST["loginName"];
$loginPass = $_REQUEST["loginPass"];

if ($loginName <> "" AND $loginPass <> "")
{
    $testName = pg_query("SELECT username FROM users WHERE username = '$loginName'");
    $testPass = pg_query("SELECT password FROM users WHERE username = '$loginName'");
    $fetchName = pg_fetch_array($testName);
    $fetchPass = pg_fetch_array($testPass);
   
if ($fetchName[username] <> "" AND $loginPass == $fetchPass[password]) <-- PROBLEMET!!!
{
  echo 'logged on';
  $_SESSION['loggedIn'] = ok;
}