PHP - Fatal Error: Call To A Member Function Fetchrow() On A Non-object

Hello guys

I'm pulling out my last remaining hairs with this PHP problem. I'm not really good at PHP but I'm trying to do some changes to a script as instructed by the developer, but apparently I got some wrong instructions. The error I get is:

Fatal error: Call to a member function postage_country_display() on a non-object in file.php on line 34

I've been searching the web high and low and can't seem to find a solution. Does anyone have a hint at what might be wrong?



Here is the code that's causing the problem and the class.

Code:

Code: [Select]
$template->set('items_id', intval($_REQUEST['items_id']));

$item_details = $db->get_sql_row("SELECT * FROM " . DB_PREFIX . "items WHERE
items_id='" . intval($_REQUEST['items_id']) . "'");

$unCountryPrice = unserialize(stripslashes($db->add_special_chars($item_details['country_postage'])));
// print_r($unCountryPrice);

$postageCountry = $item->postage_country_display($unCountryPrice,$item_details['currency']);

$template->set('postageCountry', $postageCountry);


$template->set('item_details', $item_details);

And here is the class:

Code: [Select]
function postage_country_display($unCountryPrice,$currency) {
  if (is_array($unCountryPrice)) {

$postageCountry = "<table border=\"0\" cellspacing=\"0\" cellpadding=\"0\">
";
        $fees = new fees();
while (list($k,$v)= each($unCountryPrice)){
       $cQueyr = $this->query("SELECT a.name as name1,b.name as name2 FROM " . DB_PREFIX . "countries a LEFT JOIN " . DB_PREFIX . "countries b ON (a.parent_id = b.id) WHERE a.id = '". $k ."'");
$cRow = $this->fetch_array($cQueyr);

$postageCountry.="<tr><td>". ($cRow['name2']==""?$cRow['name1']:$cRow['name2'].' > '.$cRow['name1']) ."</td><td>&nbsp;".$currency.' '.number_format($v,2)."</td></tr>";
    }
$postageCountry.="</table>";
}
return  $postageCountry;

Code: [Select]
<?php

class OnlineStore {

private $DBConnect = NULL;
private $storeID = "";
private $inventory = array();
private $shoppingCart = array();
function __construct() {
include("inc_OnlineStoreDB.php");
$this->DBConnect = $DBConnect;
}
function __destruct() {
if (!$this->DBConnect->connect_error)
$this->DBConnect->close();
}

public function setStoreID($storeID) {
if ($this->storeID != $storeID) {
$this->storeID = $storeID;
$SQLstring = "SELECT * FROM inventory " .
" where storeID = 'jw" .
$this->storeID . "'";
$QueryResult = $this->DBConnect->query($SQLstring);
if ($QueryResult === FALSE) {
$this->storeID = "";
} else {
$this->inventory = array();
$this->shoppingCart = array();
while (($Row = $QueryResult->fetch_assoc()) !== NULL) {
$this->inventory[$Row['productID']] = array();
$this->inventory[$Row['productID']]['name'] = $Row['name'];
$this->inventory[$Row['productID']]['description'] = $Row['description'];
$this->inventory[$Row['productID']]['price'] = $Row['price'];
$this->shoppingCart[$Row['productID']] = 0;
}
}
}
}

public function getStoreInformation() {
$retval = FALSE;
if ($this->storeID != "") {
$SQLstring = "SELECT * FROM store_info " .
" WHERE storeID = '" .
$this->storeID . "'";
$QueryResult = @$this->DBConnect->query($SQLstring);
if ($QueryResult !== FALSE) {
$retval = $QueryResult->fetch_assoc();
}
}
return($retval);
}

public function getProductList() {
$retval = FALSE;
$subtotal = 0;
if (count($this->inventory) > 0) {
echo "<table width='100%'>\n";
echo "<tr><th>Product</th><th>Description</th>" .
"<th>Price Each</th><th># in Cart</th>" .
"<th>Total Price</th><th>&nbsp;</th></tr>\n";
foreach ($this->inventory as $ID => $Info) {
echo "<tr><td>" .
htmlentities($Info['name']) . "</td>\n";
echo "<td>" . htmlentities($Info['description']) . "</td>\n";
printf("<td class='currency'>$%.2f</td>\n", $Info['price']);
echo "<td class='currency'>" . $this->shoppingCart[$ID] . "</td>\n";
printf("<td class='currency'>$%.2f</td>\n", $Info['price'] * $this->shoppingCart[$ID]);
echo "<td><a href='" . $_SERVER['SCRIPT_NAME'] . "?PHPSESSID=" . session_id() . "&ItemToAdd=$ID'>Add " . " Item</a></td>\n";
$subtotal += ($Info['price'] * $this->shoppingCart[$ID]);
}
echo "<tr><td colspan='4'>Subtotal</td>\n";
printf("<td class='currency'>$%.2f</td>\n", $subtotal);
echo "<td>$nbsp;</td></tr>\n";
echo "</table>";
$retval = TRUE;
}
return($retval);
}

public function addItem() {
$ProdID = $_GET['ItemToAdd'];
if (array_key_exists($ProdID, $this->shoppingCart))
$this->shoppingCart[$ProdID] += 1;
}


}

?>

having an issue to where nothing is appearing on the page and getting the
Fatal error: Call to a member function query() on a non-object in C:\xampp\htdocs\PHP\Chapter.10\class_OnlineStore.php on line 24

HERE IS THE MAIN PAGE
Code: [Select]
<?php
session_start();
require_once("class_OnlineStore.php");

$storeID = "COFFEE";
$storeInfo = array();

if (class_exists("OnlineStore")) {
if (isset($_SESSION['currentStore']))
$Store = unserialize($_SESSION['currentStore']);
else {
$Store = new OnlineStore();
}
$Store->setStoreID($storeID);
$storeInfo = $Store->getStoreInformation();
} else {
$ErrorMsgs[] = "The OnlineStore class is not available!";
$Store = NULL;
}
?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title><?php echo $storeInfo['name']; ?></title>
<link rel="stylesheet" type="text/css" href="<?php echo $storeInfo['css_file']; ?>" />
</head>

<body>
<h1><?php echo htmlentities($storeInfo['name']); ?></h1>
<h2><?php echo htmlentities($storeInfo['description']); ?></h2>
<p><?php echo htmlentities($storeInfo['welcome']); ?></p>

<?php 
$Store->getProductList();
$_SESSION['currentStore'] = serialize($Store);
?>

</body>
</html>

I HAVE REVIEWED IT OVER AND OVER AGAIN AND I CANT SEE THE PROBLEM. MAYBE SOMEONE FROM THE OUTSIDE CAN HELP OUT.

Hey guys,

I have spent the last 36 hours trying to figure this out.

I keep getting the following error:

Fatal error: Call to a member function format() on a non-object in /var/www/vhosts/xxxxx.com/httpdocs/admin/defaults.php on line 51

The reason I am not using the standard date and strtotime functions is because some of my dates exceed 2038.

What I have done is created an array with price and days from today within the array.

You can see below where I am trying to get the timestamp for 14000 days from today. I then turn that into a date using the newdate function.

I can see that this actually works on other pages on my server, I just can't figure out why it won't work here. BTW, I am using php 5.2.3.



$csv .= "Payment,".newdate("m/d/Y",newstrtotime("+".$periodic[0][0]." days")).",".$row['amount'].",".count($periodic).",".$row['frequency'].",".newdate("m/d/Y",newstrtotime("+".$periodic[$perCt][0]." days"))."\n";
function newstrtotime($strtotime){
$datetime = date_create($strtotime);
return $datetime->format("U");
}        
function newdate($format,$timestamp){
$datetime = date_create("@$timestamp");
return $datetime->format($format);
}




Let me know what you think.

I am trying to create a class and I ran into a problem. The connect function is returning a fatal error on the line below and I can't figure out the issue.

$result = $this->conn->query("SELECT unit FROM address");

 

class database {
	
	private	$server = "localhost";
	private	$db_user = "my user"; 
	private	$db_pass = "my pass"; 
	private	$db_name = "my database"; 
    private $conn;
	
	private $result = array(); 


	function connect(){
		// Create connection
		$this->conn = new mysqli($this->server, $this->db_user, $this->db_pass, $this->db_name);
		
		if ($this->conn->connect_error) {
			echo "Not connected, error: " . $mysqli_connection->connect_error;
		}
		else {
			//echo "Connected.";
			return $this->conn;
		}

	public function displayHeader(){
		$result = $this->conn->query("SELECT unit FROM address");

		if ($result->num_rows > 0) {
			// output data of each row
			while($row = $result->fetch_assoc()) {
				echo '<li>' . $row["unit"] . '</li>';
			}
		} else {
			echo "0 results";
		}
		$conn->close();
	}
		
	}

}

 

 

Fatal error: Call to a member function qstr() on a non-object in C:\xampp\htdocs\ipod\functions.php on line 14



<?php
require_once('config.php');

function checkwork()
{
header("location: underwork.php");
echo 'Sorry we are under going work :(';
}

function get_username ( $id )
{
global $db;

$query = "SELECT `login` FROM `" . DBPREFIX . "members` WHERE `member_id` = " . $db->qstr ( $id );

if ( $db->RecordCount ( $query ) == 1 )
{
$row = $db->getRow ( $query );

return $row->login;
}
else {
return FALSE;
}
}

?>


this being line 14
$query = "SELECT `login` FROM `" . DBPREFIX . "members` WHERE `member_id` = " . $db->qstr ( $id );

Hi guys. I need some help, because i'm stuck 

I'm getting this error and cand figure out what im doin wrong.

Fatal error: Call to a member function fetch_array() on a non-object in C:\xampp\htdocs\cms\webklex\theme\admin\edit_content.php on line 16.

The Code around it:
Code: [Select]
include "../config/config.php";
$host = htmlspecialchars($_SERVER["HTTP_HOST"]);
$uri  = rtrim(dirname(htmlspecialchars($_SERVER["PHP_SELF"])), "/\\");
$extra = "show_content.php";
if (empty($_POST["titel"])) {
  $id = (isset($_GET["id"])) ? (int)$_GET["id"] : false;
  $result = $db->query("SELECT * FROM `content` WHERE `id` = ".$db->real_escape_string($id)."");
  $row = $result->fetch_array(MYSQLI_ASSOC);
  $db->free_result;
  unset($result);
  }
 
  $ide = (isset($_GET["id"])) ? (int)$_GET["id"] : false;
  $result = $db->query("SELECT `id_position` FROM `content` WHERE `id` = ".$db->real_escape_string($ide)."");
  $zeile = $result->fetch_array(MYSQLI_ASSOC); ---->This is line 16
  $db->free_result;
  unset($result);
 
  $id_position_real = $zeile['id_position'];
  if ($id_position_real == 1) {
    $id_position_real = 1;
  }else{
    $id_position_real= 0;
  }
  if ($id_position_real == 1) {
    $id_position_real_none = 0;
  }else{
    $id_position_real_none = 1;
  }
?>
thanks ThatMSG

2 9 0 1

Fatal error: Call to a member function bind_param() on boolean.

 

It fails on the BIND_PARAM line.

 

I have looked at this all day, struggling with Mysqli as my normal MySql works fine with assoc and fetch.

 

I have verified in PhpInfo that mysqli is enabled.

I have verified its loaded using <?php print_r(get_loaded_extensions());

Added utf8 just to make sure. 

 

If I manually use the Wrong Password, I get a connection refused error, so I know its connected.

 

Verified my $_POST variables are there using Print in the 2 9 0 1 above.

 

All Table and Field Names are correct.  Manual Insert works fine in myPhpAdmin.

Tried Field Names and ? marks with and without single quotes.

All fields are Integers in the table.

 

Could it be related to an Auto_Increment Field in the table for a record ID that I am not providing??

A normal insert in myPhpAdmin doesn't need it.

 

 

        $QuestionID = $_POST['qID'];
        $PlayerID = $_POST['pID'];        
        $Answer = $_POST['ans'];
        $Option = $_POST['opt'];
        

        print $QuestionID . " ";
        print $PlayerID . " ";
        print $Answer . " ";
        print $Option . " ";

        $database = "Survey";

        $db_found = new mysqli('localhost', 'survey', 'survey', $database);
        $db_found->set_charset("utf8");
        
        if (!$db_found) {
            echo "Error: db connection = false";
        }
        else {
            $SQL_INSERT = "INSERT INTO 'Answers' ('QuestionID', 'PlayerID', 'Answer', 'Option') VALUES (?,?,?,?)";
            $stmt = $db_found->prepare($SQL_INSERT);
            $stmt->bind_param('iiii', $QuestionID, $PlayerID, $Answer, $Option);
            $stmt->execute();
        }

 

Thanks,

CadJoe

Edited August 26, 2017 by CadJoe

Can anyone help me with this error?

Fatal error: Call to a member function require_login() on a non-object in /home/wallls/public_html/index.php on line 27

Lines 26-33 below:

<?php 
$smilek = $_GET['id'];
$ppalout = $_GET['payout'];
$healthy = array("%", "!", "=", "'", ",", "OR", "?", "<", "&", ";");
$yummy   = array("", "", "", "", "" ,"", "", "", "", "");
$peee = str_replace($healthy, $yummy, $smilek);
$chnpay = str_replace($healthy, $yummy, $ppalout);


require_once 'appinclude.php';
require_once 'mystyle.php';

echo '<div align="center"><img src="'.$appcallbackurl.'main.png" width="300" height="150"></div>';

require_once 'ads/topads.php';
?>
<fb:tabs>
  <fb:tab-item href='<? echo $appCanvasUrl; ?>' title='Lottery' selected='true' />
  <fb:tab-item href='<? echo $appCanvasUrl; ?>earn.php' title='Get Tickets' />
  <fb:tab-item href='<? echo $appCanvasUrl; ?>payment.php' title='Payment Info' />
  <fb:tab-item href='<? echo $appCanvasUrl; ?>history.php' title='Lottery History' />
  <fb:tab-item href='<? echo $appCanvasUrl; ?>forum.php' title='Forum' />
  <fb:tab-item href='<? echo $appCanvasUrl; ?>invite.php' title='Invite Friends' />
</fb:tabs>
<div align="center">
<?
$fbid = $facebook->require_login();
$theirip = $_SERVER['REMOTE_ADDR'];


if ($fbid == "")
{
?>

Hello everyone 
I am working on a simple php mysql project (TodoList with crud funtions with fields- head, content ,date and time ) and i am stuck on this error Fatal error: Uncaught Error: Call to a member function close() on bool Stack trace: #0 {main} 
How can i fix it 
Here is link from the project https://easyupload.io/gxxv1w
 

I can call the following function successfully as a single php program

  // Acknowledge and clear the orders
   function ack($client, $merchant, $id) {
         $docs = array('string' => $id);
         $params = array('merchant' => $merchant, 'documentIdentifierArray' => $docs);
         $result = $client->call('postDocumentDownloadAck', $params);
         return $result;
         }
with

   $result = ack($t, $merchant,'2779540483');

successful output

    [documentDownloadAckProcessingStatus] => _SUCCESSFUL_
    [documentID] => 2779540483

I'm trying to figure out how to call this function as an object from another program.

Trying the following gives error  ***Call to a member function call() on a non-object***

  function postDocumentDownloadAck($t, $merchant, $id) {
     $this->error = null;
     $docs = array('string' => $this->id);
     $params = array('merchant' => $this->merchant, 'documentIdentifierArray' => $docs);

 **  I've tried the following which does nothing
     $result = $this->soap->call('postDocumentDownloadAck', $params);

** I've tried the following   -  which gives error "Call to a member function call() on a non-object"
     $result = $this->t->soap->call('postDocumentDownloadAck', $params);

     if($this->soap->fault) {
        $this->error = $result;
        return false;
     }

     return $result;
  }


***

calling program snippet for above function
   $merchant= array( "merchant"=> $merchantid, "merchantName" => $merchantname, "email"=> $login, "password"=> $password);
   $t = new AmazonMerchantAPI($merchantid, $merchantname, $login, $password);
   $documentlist= $t->GetAllPendingDocumentInfo('_GET_ORDERS_DATA_');
   $docid = $documentlist['MerchantDocumentInfo'][$i]['documentID'];
   $docs = array('string' => $docid);
   $ackorders = $t->postDocumentDownloadAck($t, $merchant,$docs);

Any ideas of what I'm doing wrong are greatly appreciated.

what's wrong in this line
$tpl->set('main_content',set_block($heading,'center',$err_tpl->fetch(load_template('error.tpl'))));

Hi,
  I have the following class:

   

class User
    {  private $_db;
       
       public function __construct($user = null)
       {
          $this->_db = DB::getInstance();
           .......
       }
       public function find($user = null)
       { if($user)
         { $field = (is_numeric($user)) ? 'id' : 'username';
         $data = $this->_db->get('users', array($field, '=', $user));
           if($data->count())
           { .........
             return true;
           }
         }
         return false;
       }

In class DB I have:
   

public static function getInstance()
      { if(!(self::$_instance)): self::$_instance = new self();
        endif;
        return self::$_instance;
      }

public function get() in class DB, after processing, returns $this, the single instance of class DB, this is assigned to $data which is then used to invoke public function count(), a member function of class DB. I am getting the following error:  Fatal error: Call to a member function count() on a non-object.  I would be very grateful if someone can point out my mistake.

I am getting this error while building OOP portal. Fatal error: Call to a member function count() on a non-object in C:\Users\Rishi\Documents\xampp\htdocs\PDO\Pitch_It\index.php on line 6   My index.php file: <?php

When I use another class inside one class, I get this error

Quote

Call to a member function _safestring() on a non-object


The code is here
Code: [Select]
<?php

    require ('db.inc.php');
    $db = new db();
    
class common {
    
    function _cookiecheck() {
        if(!isset($_SESSION['username'])) {
            if(isset($_COOKIE['username'])&&isset($_COOKIE['password'])) {
                $pass = $db->_safestring($_COOKIE['password']);
                $user = $db->_safestring($_COOKIE['username']);
                $check = _query("select password from users where username='{$user}'");
                 if($check) {
                     $_SESSION['username'] = $user;
                 }
            }
        }
    }
    

}

?>
I get the error on the line when I call $db->_safestring();

Thanks for the help

Hi
I did something in phpmyadmin the other day and I cant my site back to work. please see the attatched pdf with print screens of what I did.
Basically I was trying to add this: Code: [Select]
INSERT INTO `PP088_config_options` ( `id` , `category_name` , `name` , `value` , `config_handler_class` , `is_system` , `option_order` , `dev_comment` ) VALUES ( NULL , 'general', 'installation_base_language', 'se_se', 'StringConfigHandler', '0', '12', NULL
);
in one of the tables. When visiting www.konto.gradeup.se you will see the error message. I inserted the code from the DB.class.php file that I think is causing the problem.
Code: [Select]
*/
    static function escape($value) {
      return self::connection()->escapeValue($value);
    } // escape
   
    /**
    * Escape field / table name line 262 is the line with that starts with return self::connection
Thanks so much in advance. Im novice at phpmyadmin
Code: [Select]
<?php

  /**
  * This function holds open database connections and provides interface to them. It is also used
  * for SQL logging
  *
  * @version 1.0
  * @http://www.projectpier.org/
  */
  final class DB {
    
    /** ID of primary connection **/
    const PRIMARY_CONNECTION_ID = 'PRIMARY';
    
    /**
    * Collection of connections
    *
    * @var array
    */
    static private $connections = array();
    
    /**
    * ID of primary connection. This connection will be used if connection name is not suplied
    *
    * @var string
    */
    static private $primary_connection = self::PRIMARY_CONNECTION_ID;
    
    /**
    * SQL log
    *
    * @var array
    */
    static private $sql_log = array();
    
    /**
    * This function will return specific connection. If $connection_name is NULL primary connection will be used
    *
    * @access public
    * @param string $connection_name Connection name, if NULL primary connection will be used
    * @return AbstractDBAdapter
    */
    static function connection($connection_name = null) {
      if (is_null($connection_name)) {
        $connection_name = self::getPrimaryConnection();
      } // if
      return array_var(self::$connections, $connection_name);
    } // connection
    
    /**
    * Create new database connection
    *
    * @access public
    * @param string $adapter Adapter name (currently only mysql adapter is implemeted)
    * @param array $params Connection params
    * @param string $connection_name Name of the connection, if NULL default connection ID will be used
    * @return boolean
    * @throws FileDnxError
    * @throws DBAdapterDnx
    */
    static function connect($adapter, $params, $connection_name = null) {
      $connection_name = is_null($connection_name) || trim($connection_name) == '' ? 
        self::PRIMARY_CONNECTION_ID : 
        trim($connection_name);
        
      $adapter = self::connectAdapter($adapter, $params);
      if (($adapter instanceof AbstractDBAdapter) && $adapter->isConnected()) {
        self::$connections[$connection_name] = $adapter;
        return $adapter;
      } else {
        return null;
      } // if
      
    } // connect
    
    /**
    * This function will include adapter and try to connect. In case of error DBConnectError will be thrown
    *
    * @access public
    * @param string $adapter_name
    * @param array $params
    * @return AbstractDBAdapter
    * @throws DBAdapterDnx
    * @throws DBConnectError
    */
    private function connectAdapter($adapter_name, $params) {
      
      self::useAdapter($adapter_name);
      
      $adapter_class = self::getAdapterClass($adapter_name);
      if (!class_exists($adapter_class)) {
        throw new DBAdapterDnx($adapter_name, $adapter_class);
      } // if
      
      return new $adapter_class($params);
      
    } // connectAdapter
    
    /**
    * Figure out adapter location and include it
    *
    * @access public
    * @param string $adapter_class
    * @return void
    */
    private function useAdapter($adapter_name) {
      $adapter_class = self::getAdapterClass($adapter_name);
      $path = dirname(__FILE__) . "/adapters/$adapter_class.class.php";
      if (!is_readable($path)) {
        throw new FileDnxError($path);
      } // if
      include_once $path;
    } // useAdapter
    
    /**
    * Return class based on adapter name
    *
    * @access public
    * @param string $adapter_name
    * @return string
    */
    private function getAdapterClass($adapter_name) {
      return Inflector::camelize($adapter_name) . 'DBAdapter';
    } // getAdapterClass
    
    // ---------------------------------------------------
    //  Interface to primary adapter
    // ---------------------------------------------------
    
    /**
    * Try to execute query, ignore the result
    *
    * @access public
    * @param string $sql
    * @return true
    */
    static function attempt($sql) {
      $arguments = func_get_args();
      array_shift($arguments);
      $arguments = count($arguments) ? array_flat($arguments) : null;
      try {
        self::connection()->execute($sql, $arguments);
      } catch(Exception $e) {
      }
      return true;
    } // execute

    /**
    * Execute query and return result
    *
    * @access public
    * @param string $sql
    * @return DBResult
    * @throws DBQueryError
    */
    static function execute($sql) {
      $arguments = func_get_args();
      array_shift($arguments);
      $arguments = count($arguments) ? array_flat($arguments) : null;
      
      return self::connection()->execute($sql, $arguments);
    } // execute
    
    /**
    * Execute query and return first row from result
    *
    * @access public
    * @param string $sql
    * @return array
    * @throws DBQueryError
    */
    static function executeOne($sql) {
      $arguments = func_get_args();
      array_shift($arguments);
      $arguments = count($arguments) ? array_flat($arguments) : null;
      
      return self::connection()->executeOne($sql, $arguments);
    } // executeOne
    
    /**
    * Execute query and return all rows
    *
    * @access public
    * @param string $sql
    * @return array
    * @throws DBQueryError
    */
    static function executeAll($sql) {
      $arguments = func_get_args();
      array_shift($arguments);
      $arguments = count($arguments) ? array_flat($arguments) : null;
      
      return self::connection()->executeAll($sql, $arguments);
    } // executeAll
    
    /**
    * Start transaction
    *
    * @access public
    * @param void
    * @return boolean
    * @throws DBQueryError
    */
    static function beginWork() {
      return self::connection()->beginWork();
    } // beginWork
    
    /**
    * Commit transaction
    *
    * @access public
    * @param void
    * @return boolean
    * @throws DBQueryError
    */
    static function commit() {
      return self::connection()->commit();
    } // commit
    
    /**
    * Rollback transaction
    *
    * @access public
    * @param void
    * @return boolean
    * @throws DBQueryError
    */
    static function rollback() {
      return self::connection()->rollback();
    } // rollback
    
    /**
    * Return insert ID
    *
    * @access public
    * @param void
    * @return integer
    */
    static function lastInsertId() {
      return self::connection()->lastInsertId();
    } // lastInsertId
    
    /**
    * Return number of affected rows
    *
    * @access public
    * @param void
    * @return integer
    */
    static function affectedRows() {
      return self::connection()->affectedRows();
    } // affectedRows
    
    /**
    * Escape value
    *
    * @access public
    * @param mixed $value
    * @return string
    */
    static function escape($value) {
      return self::connection()->escapeValue($value);
    } // escape
    
    /**
    * Escape field / table name
    *
    * @access public
    * @param string $field
    * @return string
    */
    static function escapeField($field) {
      return self::connection()->escapeField($field);
    } // escapeField
    
    /**
    * Prepare string. Replace every '?' with matching escaped value
    *
    * @param string $sql
    * @param array $arguments Array of arguments
    * @return string
    */
    static function prepareString($sql, $arguments = null) {
      if (is_array($arguments) && count($arguments)) {
        foreach ($arguments as $argument) {
          $sql = str_replace_first('?', DB::escape($argument), $sql);
        } // foreach
      } // if
      return $sql;
    } // prepareString
    
    // ---------------------------------------------------
    //  Getters and setters
    // ---------------------------------------------------
    
    /**
    * Get primary_connection
    *
    * @access public
    * @param null
    * @return string
    */
    static function getPrimaryConnection() {
      return self::$primary_connection;
    } // getPrimaryConnection
    
    /**
    * Set primary_connection value
    *
    * @access public
    * @param string $value
    * @return null
    * @throws Error if connection does not exists
    */
    static function setPrimaryConnection($value) {
      if (!isset(self::$connections[$value])) {
        throw new Error("Connection '$value' does not exists");
      } // if
      self::$primary_connection = $value;
    } // setPrimaryConnection
    
    /**
    * Add query to SQL log
    *
    * @access public
    * @param string $sql
    * @return void
    */
    function addToSQLLog($sql) {
      self::$sql_log[] = $sql;
    } // addToSQLLog
    
    /**
    * Return SQL log
    *
    * @access public
    * @param void
    * @return array
    */
    function getSQLLog() {
      return self::$sql_log;
    } // getSQLLog
  
  } // DB

?>