CAllDatabase::Update

public function Update($table, $arFields, $WHERE="", $error_position="", $DEBUG=false, $ignore_errors=false, $additional_check=true)
{
	$rows = 0;
	if(is_array($arFields))
	{
		$ar = array();
		foreach($arFields as $field => $value)
		{
			if ((string)$value == '')
				$ar[] = $this->quote($field) . " = ''";
			else
				$ar[] = $this->quote($field) . " = ".$value."";
		}

		if (!empty($ar))
		{
			$strSql = "UPDATE ".$table." SET ".implode(", ", $ar)." ".$WHERE;
			if ($DEBUG)
				echo "
".htmlspecialcharsEx($strSql)."
";
			$w = $this->Query($strSql, $ignore_errors, $error_position);
			if (is_object($w))
			{
				$rows = $w->AffectedRowsCount();
				if ($DEBUG)
					echo "affected_rows = ".$rows."
";

				if ($rows <= 0 && $additional_check)
				{
					$w = $this->Query("SELECT 'x' FROM ".$table." ".$WHERE, $ignore_errors, $error_position);
					if (is_object($w))
					{
						if ($w->Fetch())
							$rows = $w->SelectedRowsCount();
						if ($DEBUG)
							echo "num_rows = ".$rows."
";
					}
				}
			}
		}
	}
	return $rows;
}