$sql = "SELECT packet, num as num_users,gid,tos as action FROM ".NIBS_PACKETS_TA
BLE." order by num";
$query = $db->query($sql);

define ("NIBS_ACCT_TABLE","actions");
define ("NIBS_AUTH_TABLE","users");
define ("NIBS_PACKETS_TABLE","packets");
define ("NIBS_PRICES_TABLE","prices");
define ("NIBS_BLACKLIST_TABLE","blacklist");
define ("NIBS_HOLIDAYS_TABLE","holidays");


include_once("./adodb/adodb.inc.php");

if(!extension_loaded ($NIBS_CONF[db_type]) ){
    echo "Модуль PHP <i>".$NIBS_CONF[db_type]."</i> не загружен.";
    exit();
}else{
    $db = &ADONewConnection($NIBS_CONF[db_type]);
}


Но не понимаю, почему ошибка, вроде же есть нормальная обработка ошибок, или я не правильно понимаю?
if(!$db->Connect($NIBS_CONF[db_host], $NIBS_CONF[db_user], $NIBS_CONF[db_passwor
d], $NIBS_CONF[db_name]) and basename($filename)!="settings.php"){
    echo "Не удалось подключиться к серверу баз данных";
    exit();
}

$query = $db->query($sql);
print $db->error(); // вот тут надо знать правильное имя метода.

<?php
/**
 * @version V5.00 05 Feb 2007  (c) 2000-2007 John Lim (jlim#natsoft.com.my). All rights reserved.
 * Released under both BSD license and Lesser GPL library license.
 * Whenever there is any discrepancy between the two licenses,
 * the BSD license will take precedence.
 *
 * Set tabs to 4 for best viewing.
 *
 * The following code is adapted from the PEAR DB error handling code.
 * Portions (c)1997-2002 The PHP Group.
 */


if (!defined("DB_ERROR")) define("DB_ERROR",-1);

if (!defined("DB_ERROR_SYNTAX")) {
    define("DB_ERROR_SYNTAX",              -2);
    define("DB_ERROR_CONSTRAINT",          -3);
    define("DB_ERROR_NOT_FOUND",           -4);
    define("DB_ERROR_ALREADY_EXISTS",      -5);
    define("DB_ERROR_UNSUPPORTED",         -6);
    define("DB_ERROR_MISMATCH",            -7);
    define("DB_ERROR_INVALID",             -8);
    define("DB_ERROR_NOT_CAPABLE",         -9);
    define("DB_ERROR_TRUNCATED",          -10);
    define("DB_ERROR_INVALID_NUMBER",     -11);
    define("DB_ERROR_INVALID_DATE",       -12);
    define("DB_ERROR_DIVZERO",            -13);
    define("DB_ERROR_NODBSELECTED",       -14);
    define("DB_ERROR_CANNOT_CREATE",      -15);
    define("DB_ERROR_CANNOT_DELETE",      -16);
    define("DB_ERROR_CANNOT_DROP",        -17);
    define("DB_ERROR_NOSUCHTABLE",        -18);
    define("DB_ERROR_NOSUCHFIELD",        -19);
    define("DB_ERROR_NEED_MORE_DATA",     -20);
    define("DB_ERROR_NOT_LOCKED",         -21);
    define("DB_ERROR_VALUE_COUNT_ON_ROW", -22);
    define("DB_ERROR_INVALID_DSN",        -23);
    define("DB_ERROR_CONNECT_FAILED",     -24);
    define("DB_ERROR_EXTENSION_NOT_FOUND",-25);
    define("DB_ERROR_NOSUCHDB",           -25);
    define("DB_ERROR_ACCESS_VIOLATION",   -26);
}

function adodb_errormsg($value)
{
global $ADODB_LANG,$ADODB_LANG_ARRAY;

    if (empty($ADODB_LANG)) $ADODB_LANG = 'en';
    if (isset($ADODB_LANG_ARRAY['LANG']) && $ADODB_LANG_ARRAY['LANG'] == $ADODB_LANG) ;
    else {
        include_once(ADODB_DIR."/lang/adodb-$ADODB_LANG.inc.php");
    }
    return isset($ADODB_LANG_ARRAY[$value]) ? $ADODB_LANG_ARRAY[$value] : $ADODB_LANG_ARRAY[DB_ERROR];
}

function adodb_error($provider,$dbType,$errno)
{
    //var_dump($errno);
    if (is_numeric($errno) && $errno == 0) return 0;
    switch($provider) {
    case 'mysql': $map = adodb_error_mysql(); break;
   
    case 'oracle':
    case 'oci8': $map = adodb_error_oci8(); break;
   
    case 'ibase': $map = adodb_error_ibase(); break;
   
    case 'odbc': $map = adodb_error_odbc(); break;
   
    case 'mssql':
    case 'sybase': $map = adodb_error_mssql(); break;
   
    case 'informix': $map = adodb_error_ifx(); break;
   
    case 'postgres': return adodb_error_pg($errno); break;
   
    case 'sqlite': return $map = adodb_error_sqlite(); break;
    default:
        return DB_ERROR;
    }   
    //print_r($map);
    //var_dump($errno);
    if (isset($map[$errno])) return $map[$errno];
    return DB_ERROR;
}

//**************************************************************************************

function adodb_error_pg($errormsg)
{
    if (is_numeric($errormsg)) return (integer) $errormsg;
    static $error_regexps = array(
            '/(Table does not exist\.|Relation [\"\'].*[\"\'] does not exist|sequence does not exist|class ".+" not found)$/' => DB_ERROR_NOSUCHTABLE,
            '/Relation [\"\'].*[\"\'] already exists|Cannot insert a duplicate key into (a )?unique index.*/'      => DB_ERROR_ALREADY_EXISTS,
            '/divide by zero$/'                     => DB_ERROR_DIVZERO,
            '/pg_atoi: error in .*: can\'t parse /' => DB_ERROR_INVALID_NUMBER,
            '/ttribute [\"\'].*[\"\'] not found|Relation [\"\'].*[\"\'] does not have attribute [\"\'].*[\"\']/' => DB_ERROR_NOSUCHFIELD,
            '/parser: parse error at or near \"/'   => DB_ERROR_SYNTAX,
            '/referential integrity violation/'     => DB_ERROR_CONSTRAINT,
            '/Relation [\"\'].*[\"\'] already exists|Cannot insert a duplicate key into (a )?unique index.*|duplicate key violates unique constraint/'    
                 => DB_ERROR_ALREADY_EXISTS
        );
    reset($error_regexps);
    while (list($regexp,$code) = each($error_regexps)) {
        if (preg_match($regexp, $errormsg)) {
            return $code;
        }
    }
    // Fall back to DB_ERROR if there was no mapping.
    return DB_ERROR;
}
   
function adodb_error_odbc()
{
static $MAP = array(
            '01004' => DB_ERROR_TRUNCATED,
            '07001' => DB_ERROR_MISMATCH,
            '21S01' => DB_ERROR_MISMATCH,
            '21S02' => DB_ERROR_MISMATCH,
            '22003' => DB_ERROR_INVALID_NUMBER,
            '22008' => DB_ERROR_INVALID_DATE,
            '22012' => DB_ERROR_DIVZERO,
            '23000' => DB_ERROR_CONSTRAINT,
            '24000' => DB_ERROR_INVALID,
            '34000' => DB_ERROR_INVALID,
            '37000' => DB_ERROR_SYNTAX,
            '42000' => DB_ERROR_SYNTAX,
            'IM001' => DB_ERROR_UNSUPPORTED,
            'S0000' => DB_ERROR_NOSUCHTABLE,
            'S0001' => DB_ERROR_NOT_FOUND,
            'S0002' => DB_ERROR_NOSUCHTABLE,
            'S0011' => DB_ERROR_ALREADY_EXISTS,
            'S0012' => DB_ERROR_NOT_FOUND,
            'S0021' => DB_ERROR_ALREADY_EXISTS,
            'S0022' => DB_ERROR_NOT_FOUND,
            'S1000' => DB_ERROR_NOSUCHTABLE,
            'S1009' => DB_ERROR_INVALID,
            'S1090' => DB_ERROR_INVALID,
            'S1C00' => DB_ERROR_NOT_CAPABLE
        );
        return $MAP;
}

function adodb_error_ibase()
{
static $MAP = array(
            -104 => DB_ERROR_SYNTAX,
            -150 => DB_ERROR_ACCESS_VIOLATION,
            -151 => DB_ERROR_ACCESS_VIOLATION,
            -155 => DB_ERROR_NOSUCHTABLE,
            -157 => DB_ERROR_NOSUCHFIELD,
            -158 => DB_ERROR_VALUE_COUNT_ON_ROW,
            -170 => DB_ERROR_MISMATCH,
            -171 => DB_ERROR_MISMATCH,
            -172 => DB_ERROR_INVALID,
            -204 => DB_ERROR_INVALID,
            -205 => DB_ERROR_NOSUCHFIELD,
            -206 => DB_ERROR_NOSUCHFIELD,
            -208 => DB_ERROR_INVALID,
            -219 => DB_ERROR_NOSUCHTABLE,
            -297 => DB_ERROR_CONSTRAINT,
            -530 => DB_ERROR_CONSTRAINT,
            -803 => DB_ERROR_CONSTRAINT,
            -551 => DB_ERROR_ACCESS_VIOLATION,
            -552 => DB_ERROR_ACCESS_VIOLATION,
            -922 => DB_ERROR_NOSUCHDB,
            -923 => DB_ERROR_CONNECT_FAILED,
            -924 => DB_ERROR_CONNECT_FAILED
        );
       
        return $MAP;
}

function adodb_error_ifx()
{
static $MAP = array(
            '-201'    => DB_ERROR_SYNTAX,
            '-206'    => DB_ERROR_NOSUCHTABLE,
            '-217'    => DB_ERROR_NOSUCHFIELD,
            '-329'    => DB_ERROR_NODBSELECTED,
            '-1204'   => DB_ERROR_INVALID_DATE,
            '-1205'   => DB_ERROR_INVALID_DATE,
            '-1206'   => DB_ERROR_INVALID_DATE,
            '-1209'   => DB_ERROR_INVALID_DATE,
            '-1210'   => DB_ERROR_INVALID_DATE,
            '-1212'   => DB_ERROR_INVALID_DATE
       );
       
       return $MAP;
}

function adodb_error_oci8()
{
static $MAP = array(
             1 => DB_ERROR_ALREADY_EXISTS,
            900 => DB_ERROR_SYNTAX,
            904 => DB_ERROR_NOSUCHFIELD,
            923 => DB_ERROR_SYNTAX,
            942 => DB_ERROR_NOSUCHTABLE,
            955 => DB_ERROR_ALREADY_EXISTS,
            1476 => DB_ERROR_DIVZERO,
            1722 => DB_ERROR_INVALID_NUMBER,
            2289 => DB_ERROR_NOSUCHTABLE,
            2291 => DB_ERROR_CONSTRAINT,
            2449 => DB_ERROR_CONSTRAINT
        );
       
    return $MAP;
}

function adodb_error_mssql()
{
static $MAP = array(
          208 => DB_ERROR_NOSUCHTABLE,
          2601 => DB_ERROR_ALREADY_EXISTS
      );
       
    return $MAP;
}

function adodb_error_sqlite()
{
static $MAP = array(
          1 => DB_ERROR_SYNTAX
       );
       
    return $MAP;
}

function adodb_error_mysql()
{
static $MAP = array(
           1004 => DB_ERROR_CANNOT_CREATE,
           1005 => DB_ERROR_CANNOT_CREATE,
           1006 => DB_ERROR_CANNOT_CREATE,
           1007 => DB_ERROR_ALREADY_EXISTS,
           1008 => DB_ERROR_CANNOT_DROP,
           1045 => DB_ERROR_ACCESS_VIOLATION,
           1046 => DB_ERROR_NODBSELECTED,
           1049 => DB_ERROR_NOSUCHDB,
           1050 => DB_ERROR_ALREADY_EXISTS,
           1051 => DB_ERROR_NOSUCHTABLE,
           1054 => DB_ERROR_NOSUCHFIELD,
           1062 => DB_ERROR_ALREADY_EXISTS,
           1064 => DB_ERROR_SYNTAX,
           1100 => DB_ERROR_NOT_LOCKED,
           1136 => DB_ERROR_VALUE_COUNT_ON_ROW,
           1146 => DB_ERROR_NOSUCHTABLE,
           1048 => DB_ERROR_CONSTRAINT,
            2002 => DB_ERROR_CONNECT_FAILED,
            2005 => DB_ERROR_CONNECT_FAILED
       );
       
    return $MAP;
}
?>

while ($row = $query->fetchRow())

    function Query($sql, $inputarr=false)
    {
        $rs = $this->Execute($sql, $inputarr);
        if (!$rs && defined('ADODB_PEAR')) return ADODB_PEAR_Error();
        return $rs;
    }

    function DB()
    {
    global $_ADODB_ACTIVE_DBS;
   
        if ($this->_dbat < 0) {
            $false = false;
            $this->Error("No database connection set: use ADOdb_Active_Record::SetDatabaseAdaptor(\$db)", "DB");
            return $false;
        }
        $activedb = $_ADODB_ACTIVE_DBS[$this->_dbat];
        $db = $activedb->db;
        return $db;
    }

if($query) {
... // тут обработка, если вернулся объект
}

$row = $query->fetchRow()

while ( is_object ($query) &&($row = $query->fetchRow()) {

  function FetchRow()
    {
        if ($this->EOF) {
            $false = false;
            return $false;
        }
        $arr = $this->fields;
        $this->_currentRow++;
        if (!$this->_fetch()) $this->EOF = true;
        return $arr;