vendor/doctrine/dbal/lib/Doctrine/DBAL/Driver/OCI8/Driver.php

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<?php
/*
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * This software consists of voluntary contributions made by many individuals
 * and is licensed under the MIT license. For more information, see
 * <http://www.doctrine-project.org>.
 */

namespace Doctrine\DBAL\Driver\OCI8;

use Doctrine\DBAL\DBALException;
use Doctrine\DBAL\Driver\AbstractOracleDriver;

/**
 * A Doctrine DBAL driver for the Oracle OCI8 PHP extensions.
 *
 * @author Roman Borschel <roman@code-factory.org>
 * @since 2.0
 */
class Driver extends AbstractOracleDriver
{
    /**
     * {@inheritdoc}
     */
    public function connect(array $params, $username = null, $password = null, array $driverOptions = array())
    {
        try {
            return new OCI8Connection(
                $username,
                $password,
                $this->_constructDsn($params),
                isset($params['charset']) ? $params['charset'] : null,
                isset($params['sessionMode']) ? $params['sessionMode'] : OCI_DEFAULT,
                isset($params['persistent']) ? $params['persistent'] : false
            );
        } catch (OCI8Exception $e) {
            throw DBALException::driverException($this, $e);
        }
    }

    /**
     * Constructs the Oracle DSN.
     *
     * @param array $params
     *
     * @return string The DSN.
     */
    protected function _constructDsn(array $params)
    {