catalog/model/localisation/currency.php

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<?php
class ModelLocalisationCurrency extends Model {
	public function getCurrencyByCode($currency) {
		$query = $this->db->query("SELECT DISTINCT * FROM " . DB_PREFIX . "currency WHERE code = '" . $this->db->escape($currency) . "'");

		return $query->row;
	}

	public function getCurrencies() {
		$currency_data = $this->cache->get('currency');

		if (!$currency_data) {
			$currency_data = array();

			$query = $this->db->query("SELECT * FROM " . DB_PREFIX . "currency ORDER BY title ASC");

			foreach ($query->rows as $result) {
				$currency_data[$result['code']] = array(
					'currency_id'   => $result['currency_id'],
					'title'         => $result['title'],
					'code'          => $result['code'],
					'symbol_left'   => $result['symbol_left'],
					'symbol_right'  => $result['symbol_right'],
					'decimal_place' => $result['decimal_place'],
					'value'         => $result['value'],
					'status'        => $result['status'],
					'date_modified' => $result['date_modified']
				);
			}

			$this->cache->set('currency', $currency_data);
		}

		return $currency_data;
	}

    public function editValueByCode($code, $value) {
        $this->db->query("UPDATE " . DB_PREFIX . "currency SET value = '" . (float)$value . "', date_modified = NOW() WHERE code = '" . $this->db->escape((string)$code) . "'");

        $this->cache->delete('currency');
    }

}