vendor/doctrine/dbal/lib/Doctrine/DBAL/Query/Expression/ExpressionBuilder.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\Query\Expression;

use Doctrine\DBAL\Connection;

/**
 * ExpressionBuilder class is responsible to dynamically create SQL query parts.
 *
 * @link   www.doctrine-project.org
 * @since  2.1
 * @author Guilherme Blanco <guilhermeblanco@hotmail.com>
 * @author Benjamin Eberlei <kontakt@beberlei.de>
 */
class ExpressionBuilder
{
    const EQ  = '=';
    const NEQ = '<>';
    const LT  = '<';
    const LTE = '<=';
    const GT  = '>';
    const GTE = '>=';

    /**
     * The DBAL Connection.
     *
     * @var \Doctrine\DBAL\Connection
     */
    private $connection;

    /**
     * Initializes a new <tt>ExpressionBuilder</tt>.
     *
     * @param \Doctrine\DBAL\Connection $connection The DBAL Connection.
     */
    public function __construct(Connection $connection)
    {
        $this->connection = $connection;
    }

    /**
     * Creates a conjunction of the given boolean expressions.
     *