<?php
/**
 * Class represents records from table currency_exchange
 * {autogenerated}
 * @property int $rate_id 
 * @property string $currency 
 * @property date $date 
 * @property double $rate 
 * @see Am_Table
 */
class CurrencyExchange extends Am_Record 
{
}

class CurrencyExchangeTable extends Am_Table 
{
    protected $_key = 'rate_id';
    protected $_table = '?_currency_exchange';
    
    /**
     * Get actual rate for currency to date
     * @param string $currency example "EUR"
     * @param type $date "2011-01-23"
     * @return double|null
     */
    function getRate($currency, $date)
    {
        $ret = $this->_db->selectCell(
            "SELECT rate FROM ?_currency_exchange
             WHERE currency=? AND `date`<=?
             ORDER BY `date` DESC
             LIMIT 1", 
            $currency, $date);
        if (empty($ret)) $ret = 1.00;
        return $ret;
    }
}