function __delRateFromCache($from, $to)
{
global $application;
$tables = $this->getTables();
$rc_table = $tables['cconv_rates_cache']['columns'];
$query = new DB_Delete('cconv_rates_cache');
$query->addWhereOpenSection();
$query->WhereValue($rc_table['from'], DB_EQ, $from);
$query->WhereAnd();
$query->WhereValue($rc_table['to'], DB_EQ, $to);
$query->addWhereCloseSection();
$query->WhereOR();
$query->addWhereOpenSection();
$query->WhereValue($rc_table['from'], DB_EQ, $to);
$query->WhereAND();
$query->WhereValue($rc_table['to'], DB_EQ, $from);
$query->addWhereCloseSection();
$application->db->getDB_Result($query);
return;
}