Currency.php

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<?php
namespace Magento\Directory\Model\ResourceModel;

class Currency extends \Magento\Framework\Model\ResourceModel\Db\AbstractDb
{
    protected $_currencyRateTable;

    protected static $_rateCache;

    protected function _construct()
    {
        $this->_init('directory_currency', 'currency_code');
        $this->_currencyRateTable = $this->getTable('directory_currency_rate');
    }

    public function getRate($currencyFrom, $currencyTo)
    {
        if ($currencyFrom instanceof \Magento\Directory\Model\Currency) {
            $currencyFrom = $currencyFrom->getCode();
        }

        if ($currencyTo instanceof \Magento\Directory\Model\Currency) {
            $currencyTo = $currencyTo->getCode();
        }

        if ($currencyFrom == $currencyTo) {
            return 1;
        }

        if (!isset(self::$_rateCache[$currencyFrom][$currencyTo])) {
            $connection = $this->getConnection();
            $bind = [':currency_from' => strtoupper($currencyFrom), ':currency_to' => strtoupper($currencyTo)];
            $select = $connection->select()->from(
                $this->_currencyRateTable,
                'rate'
            )->where(
                'currency_from = :currency_from'
            )->where(
                'currency_to = :currency_to'
            );

            self::$_rateCache[$currencyFrom][$currencyTo] = $connection->fetchOne($select, $bind);
        }

        return self::$_rateCache[$currencyFrom][$currencyTo];
    }

    public function getAnyRate($currencyFrom, $currencyTo)
    {
        if ($currencyFrom instanceof \Magento\Directory\Model\Currency) {
            $currencyFrom = $currencyFrom->getCode();
        }

        if ($currencyTo instanceof \Magento\Directory\Model\Currency) {
            $currencyTo = $currencyTo->getCode();
        }

        if ($currencyFrom == $currencyTo) {
            return 1;
        }

        if (!isset(self::$_rateCache[$currencyFrom][$currencyTo])) {
            $connection = $this->getConnection();
            $bind = [':currency_from' => strtoupper($currencyFrom), ':currency_to' => strtoupper($currencyTo)];
            $select = $connection->select()->from(
                $this->_currencyRateTable,
                'rate'
            )->where(
                'currency_from = :currency_from'
            )->where(
                'currency_to = :currency_to'
            );

            $rate = $connection->fetchOne($select, $bind);
            if ($rate === false) {
                $select = $connection->select()->from(
                    $this->_currencyRateTable,
                    new \Zend_Db_Expr('1/rate')
                )->where(
                    'currency_to = :currency_from'
                )->where(
                    'currency_from = :currency_to'
                );
                $rate = $connection->fetchOne($select, $bind);
            }
            self::$_rateCache[$currencyFrom][$currencyTo] = $rate;
        }

        return self::$_rateCache[$currencyFrom][$currencyTo];
    }

    public function saveRates($rates)
    {
        if (is_array($rates) && sizeof($rates) > 0) {
            $connection = $this->getConnection();
            $data = [];
            foreach ($rates as $currencyCode => $rate) {
                foreach ($rate as $currencyTo => $value) {
                    $value = abs($value);
                    if ($value == 0) {
                        continue;
                    }
                    $data[] = ['currency_from' => $currencyCode, 'currency_to' => $currencyTo, 'rate' => $value];
                }
            }
            if ($data) {
                $connection->insertOnDuplicate($this->_currencyRateTable, $data, ['rate']);
            }
        } else {
            throw new \Magento\Framework\Exception\LocalizedException(__('Please correct the rates received'));
        }
    }

    public function getConfigCurrencies($model, $path)
    {
        $connection = $this->getConnection();
        $bind = [':config_path' => $path];
        $select = $connection->select()->from($this->getTable('core_config_data'))->where('path = :config_path');
        $result = [];
        $rowSet = $connection->fetchAll($select, $bind);
        foreach ($rowSet as $row) {
            $result = array_merge($result, explode(',', $row['value']));
        }
        sort($result);

        return array_unique($result);
    }

    public function getCurrencyRates($currency, $toCurrencies = null)
    {
        $rates = [];
        if (is_array($currency)) {
            foreach ($currency as $code) {
                $rates[$code] = $this->_getRatesByCode($code, $toCurrencies);
            }
        } else {
            $rates = $this->_getRatesByCode($currency, $toCurrencies);
        }

        return $rates;
    }

    protected function _getRatesByCode($code, $toCurrencies = null)
    {
        $connection = $this->getConnection();
        $bind = [':currency_from' => $code];
        $select = $connection->select()->from(
            $this->getTable('directory_currency_rate'),
            ['currency_to', 'rate']
        )->where(
            'currency_from = :currency_from'
        )->where(
            'currency_to IN(?)',
            $toCurrencies
        );
        $rowSet = $connection->fetchAll($select, $bind);
        $result = [];

        foreach ($rowSet as $row) {
            $result[$row['currency_to']] = $row['rate'];
        }

        return $result;
    }
}