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Current File : /htdocs/vendor/doctrine/dbal/lib/Doctrine/DBAL/Query/QueryBuilder.php
<?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;

use Doctrine\DBAL\Query\Expression\CompositeExpression;
use Doctrine\DBAL\Connection;

/**
 * QueryBuilder class is responsible to dynamically create SQL queries.
 *
 * Important: Verify that every feature you use will work with your database vendor.
 * SQL Query Builder does not attempt to validate the generated SQL at all.
 *
 * The query builder does no validation whatsoever if certain features even work with the
 * underlying database vendor. Limit queries and joins are NOT applied to UPDATE and DELETE statements
 * even if some vendors such as MySQL support it.
 *
 * @link   www.doctrine-project.org
 * @since  2.1
 * @author Guilherme Blanco <guilhermeblanco@hotmail.com>
 * @author Benjamin Eberlei <kontakt@beberlei.de>
 */
class QueryBuilder
{
    /*
     * The query types.
     */
    const SELECT = 0;
    const DELETE = 1;
    const UPDATE = 2;

    /*
     * The builder states.
     */
    const STATE_DIRTY = 0;
    const STATE_CLEAN = 1;

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

    /**
     * @var array The array of SQL parts collected.
     */
    private $sqlParts = array(
        'select'  => array(),
        'from'    => array(),
        'join'    => array(),
        'set'     => array(),
        'where'   => null,
        'groupBy' => array(),
        'having'  => null,
        'orderBy' => array()
    );

    /**
     * The complete SQL string for this query.
     *
     * @var string
     */
    private $sql;

    /**
     * The query parameters.
     *
     * @var array
     */
    private $params = array();

    /**
     * The parameter type map of this query.
     *
     * @var array
     */
    private $paramTypes = array();

    /**
     * The type of query this is. Can be select, update or delete.
     *
     * @var integer
     */
    private $type = self::SELECT;

    /**
     * The state of the query object. Can be dirty or clean.
     *
     * @var integer
     */
    private $state = self::STATE_CLEAN;

    /**
     * The index of the first result to retrieve.
     *
     * @var integer
     */
    private $firstResult = null;

    /**
     * The maximum number of results to retrieve.
     *
     * @var integer
     */
    private $maxResults = null;

    /**
     * The counter of bound parameters used with {@see bindValue).
     *
     * @var integer
     */
    private $boundCounter = 0;

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

    /**
     * Gets an ExpressionBuilder used for object-oriented construction of query expressions.
     * This producer method is intended for convenient inline usage. Example:
     *
     * <code>
     *     $qb = $conn->createQueryBuilder()
     *         ->select('u')
     *         ->from('users', 'u')
     *         ->where($qb->expr()->eq('u.id', 1));
     * </code>
     *
     * For more complex expression construction, consider storing the expression
     * builder object in a local variable.
     *
     * @return \Doctrine\DBAL\Query\Expression\ExpressionBuilder
     */
    public function expr()
    {
        return $this->connection->getExpressionBuilder();
    }

    /**
     * Gets the type of the currently built query.
     *
     * @return integer
     */
    public function getType()
    {
        return $this->type;
    }

    /**
     * Gets the associated DBAL Connection for this query builder.
     *
     * @return \Doctrine\DBAL\Connection
     */
    public function getConnection()
    {
        return $this->connection;
    }

    /**
     * Gets the state of this query builder instance.
     *
     * @return integer Either QueryBuilder::STATE_DIRTY or QueryBuilder::STATE_CLEAN.
     */
    public function getState()
    {
        return $this->state;
    }

    /**
     * Executes this query using the bound parameters and their types.
     *
     * Uses {@see Connection::executeQuery} for select statements and {@see Connection::executeUpdate}
     * for insert, update and delete statements.
     *
     * @return mixed
     */
    public function execute()
    {
        if ($this->type == self::SELECT) {
            return $this->connection->executeQuery($this->getSQL(), $this->params, $this->paramTypes);
        } else {
            return $this->connection->executeUpdate($this->getSQL(), $this->params, $this->paramTypes);
        }
    }

    /**
     * Gets the complete SQL string formed by the current specifications of this QueryBuilder.
     *
     * <code>
     *     $qb = $em->createQueryBuilder()
     *         ->select('u')
     *         ->from('User', 'u')
     *     echo $qb->getSQL(); // SELECT u FROM User u
     * </code>
     *
     * @return string The SQL query string.
     */
    public function getSQL()
    {
        if ($this->sql !== null && $this->state === self::STATE_CLEAN) {
            return $this->sql;
        }

        switch ($this->type) {
            case self::DELETE:
                $sql = $this->getSQLForDelete();
                break;

            case self::UPDATE:
                $sql = $this->getSQLForUpdate();
                break;

            case self::SELECT:
            default:
                $sql = $this->getSQLForSelect();
                break;
        }

        $this->state = self::STATE_CLEAN;
        $this->sql = $sql;

        return $sql;
    }

    /**
     * Sets a query parameter for the query being constructed.
     *
     * <code>
     *     $qb = $conn->createQueryBuilder()
     *         ->select('u')
     *         ->from('users', 'u')
     *         ->where('u.id = :user_id')
     *         ->setParameter(':user_id', 1);
     * </code>
     *
     * @param string|integer $key   The parameter position or name.
     * @param mixed          $value The parameter value.
     * @param string|null    $type  One of the PDO::PARAM_* constants.
     *
     * @return \Doctrine\DBAL\Query\QueryBuilder This QueryBuilder instance.
     */
    public function setParameter($key, $value, $type = null)
    {
        if ($type !== null) {
            $this->paramTypes[$key] = $type;
        }

        $this->params[$key] = $value;

        return $this;
    }

    /**
     * Sets a collection of query parameters for the query being constructed.
     *
     * <code>
     *     $qb = $conn->createQueryBuilder()
     *         ->select('u')
     *         ->from('users', 'u')
     *         ->where('u.id = :user_id1 OR u.id = :user_id2')
     *         ->setParameters(array(
     *             ':user_id1' => 1,
     *             ':user_id2' => 2
     *         ));
     * </code>
     *
     * @param array $params The query parameters to set.
     * @param array $types  The query parameters types to set.
     *
     * @return \Doctrine\DBAL\Query\QueryBuilder This QueryBuilder instance.
     */
    public function setParameters(array $params, array $types = array())
    {
        $this->paramTypes = $types;
        $this->params = $params;

        return $this;
    }

    /**
     * Gets all defined query parameters for the query being constructed.
     *
     * @return array The currently defined query parameters.
     */
    public function getParameters()
    {
        return $this->params;
    }

    /**
     * Gets a (previously set) query parameter of the query being constructed.
     *
     * @param mixed $key The key (index or name) of the bound parameter.
     *
     * @return mixed The value of the bound parameter.
     */
    public function getParameter($key)
    {
        return isset($this->params[$key]) ? $this->params[$key] : null;
    }

    /**
     * Sets the position of the first result to retrieve (the "offset").
     *
     * @param integer $firstResult The first result to return.
     *
     * @return \Doctrine\DBAL\Query\QueryBuilder This QueryBuilder instance.
     */
    public function setFirstResult($firstResult)
    {
        $this->state = self::STATE_DIRTY;
        $this->firstResult = $firstResult;

        return $this;
    }

    /**
     * Gets the position of the first result the query object was set to retrieve (the "offset").
     * Returns NULL if {@link setFirstResult} was not applied to this QueryBuilder.
     *
     * @return integer The position of the first result.
     */
    public function getFirstResult()
    {
        return $this->firstResult;
    }

    /**
     * Sets the maximum number of results to retrieve (the "limit").
     *
     * @param integer $maxResults The maximum number of results to retrieve.
     *
     * @return \Doctrine\DBAL\Query\QueryBuilder This QueryBuilder instance.
     */
    public function setMaxResults($maxResults)
    {
        $this->state = self::STATE_DIRTY;
        $this->maxResults = $maxResults;

        return $this;
    }

    /**
     * Gets the maximum number of results the query object was set to retrieve (the "limit").
     * Returns NULL if {@link setMaxResults} was not applied to this query builder.
     *
     * @return integer The maximum number of results.
     */
    public function getMaxResults()
    {
        return $this->maxResults;
    }

    /**
     * Either appends to or replaces a single, generic query part.
     *
     * The available parts are: 'select', 'from', 'set', 'where',
     * 'groupBy', 'having' and 'orderBy'.
     *
     * @param string  $sqlPartName
     * @param string  $sqlPart
     * @param boolean $append
     *
     * @return \Doctrine\DBAL\Query\QueryBuilder This QueryBuilder instance.
     */
    public function add($sqlPartName, $sqlPart, $append = false)
    {
        $isArray = is_array($sqlPart);
        $isMultiple = is_array($this->sqlParts[$sqlPartName]);

        if ($isMultiple && !$isArray) {
            $sqlPart = array($sqlPart);
        }

        $this->state = self::STATE_DIRTY;

        if ($append) {
            if ($sqlPartName == "orderBy" || $sqlPartName == "groupBy" || $sqlPartName == "select" || $sqlPartName == "set") {
                foreach ($sqlPart as $part) {
                    $this->sqlParts[$sqlPartName][] = $part;
                }
            } else if ($isArray && is_array($sqlPart[key($sqlPart)])) {
                $key = key($sqlPart);
                $this->sqlParts[$sqlPartName][$key][] = $sqlPart[$key];
            } else if ($isMultiple) {
                $this->sqlParts[$sqlPartName][] = $sqlPart;
            } else {
                $this->sqlParts[$sqlPartName] = $sqlPart;
            }

            return $this;
        }

        $this->sqlParts[$sqlPartName] = $sqlPart;

        return $this;
    }

    /**
     * Specifies an item that is to be returned in the query result.
     * Replaces any previously specified selections, if any.
     *
     * <code>
     *     $qb = $conn->createQueryBuilder()
     *         ->select('u.id', 'p.id')
     *         ->from('users', 'u')
     *         ->leftJoin('u', 'phonenumbers', 'p', 'u.id = p.user_id');
     * </code>
     *
     * @param mixed $select The selection expressions.
     *
     * @return \Doctrine\DBAL\Query\QueryBuilder This QueryBuilder instance.
     */
    public function select($select = null)
    {
        $this->type = self::SELECT;

        if (empty($select)) {
            return $this;
        }

        $selects = is_array($select) ? $select : func_get_args();

        return $this->add('select', $selects, false);
    }

    /**
     * Adds an item that is to be returned in the query result.
     *
     * <code>
     *     $qb = $conn->createQueryBuilder()
     *         ->select('u.id')
     *         ->addSelect('p.id')
     *         ->from('users', 'u')
     *         ->leftJoin('u', 'phonenumbers', 'u.id = p.user_id');
     * </code>
     *
     * @param mixed $select The selection expression.
     *
     * @return \Doctrine\DBAL\Query\QueryBuilder This QueryBuilder instance.
     */
    public function addSelect($select = null)
    {
        $this->type = self::SELECT;

        if (empty($select)) {
            return $this;
        }

        $selects = is_array($select) ? $select : func_get_args();

        return $this->add('select', $selects, true);
    }

    /**
     * Turns the query being built into a bulk delete query that ranges over
     * a certain table.
     *
     * <code>
     *     $qb = $conn->createQueryBuilder()
     *         ->delete('users', 'u')
     *         ->where('u.id = :user_id');
     *         ->setParameter(':user_id', 1);
     * </code>
     *
     * @param string $delete The table whose rows are subject to the deletion.
     * @param string $alias  The table alias used in the constructed query.
     *
     * @return \Doctrine\DBAL\Query\QueryBuilder This QueryBuilder instance.
     */
    public function delete($delete = null, $alias = null)
    {
        $this->type = self::DELETE;

        if ( ! $delete) {
            return $this;
        }

        return $this->add('from', array(
            'table' => $delete,
            'alias' => $alias
        ));
    }

    /**
     * Turns the query being built into a bulk update query that ranges over
     * a certain table
     *
     * <code>
     *     $qb = $conn->createQueryBuilder()
     *         ->update('users', 'u')
     *         ->set('u.password', md5('password'))
     *         ->where('u.id = ?');
     * </code>
     *
     * @param string $update The table whose rows are subject to the update.
     * @param string $alias  The table alias used in the constructed query.
     *
     * @return \Doctrine\DBAL\Query\QueryBuilder This QueryBuilder instance.
     */
    public function update($update = null, $alias = null)
    {
        $this->type = self::UPDATE;

        if ( ! $update) {
            return $this;
        }

        return $this->add('from', array(
            'table' => $update,
            'alias' => $alias
        ));
    }

    /**
     * Creates and adds a query root corresponding to the table identified by the
     * given alias, forming a cartesian product with any existing query roots.
     *
     * <code>
     *     $qb = $conn->createQueryBuilder()
     *         ->select('u.id')
     *         ->from('users', 'u')
     * </code>
     *
     * @param string $from   The table.
     * @param string $alias  The alias of the table.
     *
     * @return \Doctrine\DBAL\Query\QueryBuilder This QueryBuilder instance.
     */
    public function from($from, $alias)
    {
        return $this->add('from', array(
            'table' => $from,
            'alias' => $alias
        ), true);
    }

    /**
     * Creates and adds a join to the query.
     *
     * <code>
     *     $qb = $conn->createQueryBuilder()
     *         ->select('u.name')
     *         ->from('users', 'u')
     *         ->join('u', 'phonenumbers', 'p', 'p.is_primary = 1');
     * </code>
     *
     * @param string $fromAlias The alias that points to a from clause.
     * @param string $join      The table name to join.
     * @param string $alias     The alias of the join table.
     * @param string $condition The condition for the join.
     *
     * @return \Doctrine\DBAL\Query\QueryBuilder This QueryBuilder instance.
     */
    public function join($fromAlias, $join, $alias, $condition = null)
    {
        return $this->innerJoin($fromAlias, $join, $alias, $condition);
    }

    /**
     * Creates and adds a join to the query.
     *
     * <code>
     *     $qb = $conn->createQueryBuilder()
     *         ->select('u.name')
     *         ->from('users', 'u')
     *         ->innerJoin('u', 'phonenumbers', 'p', 'p.is_primary = 1');
     * </code>
     *
     * @param string $fromAlias The alias that points to a from clause.
     * @param string $join      The table name to join.
     * @param string $alias     The alias of the join table.
     * @param string $condition The condition for the join.
     *
     * @return \Doctrine\DBAL\Query\QueryBuilder This QueryBuilder instance.
     */
    public function innerJoin($fromAlias, $join, $alias, $condition = null)
    {
        return $this->add('join', array(
            $fromAlias => array(
                'joinType'      => 'inner',
                'joinTable'     => $join,
                'joinAlias'     => $alias,
                'joinCondition' => $condition
            )
        ), true);
    }

    /**
     * Creates and adds a left join to the query.
     *
     * <code>
     *     $qb = $conn->createQueryBuilder()
     *         ->select('u.name')
     *         ->from('users', 'u')
     *         ->leftJoin('u', 'phonenumbers', 'p', 'p.is_primary = 1');
     * </code>
     *
     * @param string $fromAlias The alias that points to a from clause.
     * @param string $join      The table name to join.
     * @param string $alias     The alias of the join table.
     * @param string $condition The condition for the join.
     *
     * @return \Doctrine\DBAL\Query\QueryBuilder This QueryBuilder instance.
     */
    public function leftJoin($fromAlias, $join, $alias, $condition = null)
    {
        return $this->add('join', array(
            $fromAlias => array(
                'joinType'      => 'left',
                'joinTable'     => $join,
                'joinAlias'     => $alias,
                'joinCondition' => $condition
            )
        ), true);
    }

    /**
     * Creates and adds a right join to the query.
     *
     * <code>
     *     $qb = $conn->createQueryBuilder()
     *         ->select('u.name')
     *         ->from('users', 'u')
     *         ->rightJoin('u', 'phonenumbers', 'p', 'p.is_primary = 1');
     * </code>
     *
     * @param string $fromAlias The alias that points to a from clause.
     * @param string $join      The table name to join.
     * @param string $alias     The alias of the join table.
     * @param string $condition The condition for the join.
     *
     * @return \Doctrine\DBAL\Query\QueryBuilder This QueryBuilder instance.
     */
    public function rightJoin($fromAlias, $join, $alias, $condition = null)
    {
        return $this->add('join', array(
            $fromAlias => array(
                'joinType'      => 'right',
                'joinTable'     => $join,
                'joinAlias'     => $alias,
                'joinCondition' => $condition
            )
        ), true);
    }

    /**
     * Sets a new value for a column in a bulk update query.
     *
     * <code>
     *     $qb = $conn->createQueryBuilder()
     *         ->update('users', 'u')
     *         ->set('u.password', md5('password'))
     *         ->where('u.id = ?');
     * </code>
     *
     * @param string $key   The column to set.
     * @param string $value The value, expression, placeholder, etc.
     *
     * @return \Doctrine\DBAL\Query\QueryBuilder This QueryBuilder instance.
     */
    public function set($key, $value)
    {
        return $this->add('set', $key .' = ' . $value, true);
    }

    /**
     * Specifies one or more restrictions to the query result.
     * Replaces any previously specified restrictions, if any.
     *
     * <code>
     *     $qb = $conn->createQueryBuilder()
     *         ->select('u.name')
     *         ->from('users', 'u')
     *         ->where('u.id = ?');
     *
     *     // You can optionally programatically build and/or expressions
     *     $qb = $conn->createQueryBuilder();
     *
     *     $or = $qb->expr()->orx();
     *     $or->add($qb->expr()->eq('u.id', 1));
     *     $or->add($qb->expr()->eq('u.id', 2));
     *
     *     $qb->update('users', 'u')
     *         ->set('u.password', md5('password'))
     *         ->where($or);
     * </code>
     *
     * @param mixed $predicates The restriction predicates.
     *
     * @return \Doctrine\DBAL\Query\QueryBuilder This QueryBuilder instance.
     */
    public function where($predicates)
    {
        if ( ! (func_num_args() == 1 && $predicates instanceof CompositeExpression) ) {
            $predicates = new CompositeExpression(CompositeExpression::TYPE_AND, func_get_args());
        }

        return $this->add('where', $predicates);
    }

    /**
     * Adds one or more restrictions to the query results, forming a logical
     * conjunction with any previously specified restrictions.
     *
     * <code>
     *     $qb = $conn->createQueryBuilder()
     *         ->select('u')
     *         ->from('users', 'u')
     *         ->where('u.username LIKE ?')
     *         ->andWhere('u.is_active = 1');
     * </code>
     *
     * @param mixed $where The query restrictions.
     *
     * @return \Doctrine\DBAL\Query\QueryBuilder This QueryBuilder instance.
     *
     * @see where()
     */
    public function andWhere($where)
    {
        $where = $this->getQueryPart('where');
        $args = func_get_args();

        if ($where instanceof CompositeExpression && $where->getType() === CompositeExpression::TYPE_AND) {
            $where->addMultiple($args);
        } else {
            array_unshift($args, $where);
            $where = new CompositeExpression(CompositeExpression::TYPE_AND, $args);
        }

        return $this->add('where', $where, true);
    }

    /**
     * Adds one or more restrictions to the query results, forming a logical
     * disjunction with any previously specified restrictions.
     *
     * <code>
     *     $qb = $em->createQueryBuilder()
     *         ->select('u.name')
     *         ->from('users', 'u')
     *         ->where('u.id = 1')
     *         ->orWhere('u.id = 2');
     * </code>
     *
     * @param mixed $where The WHERE statement.
     *
     * @return \Doctrine\DBAL\Query\QueryBuilder This QueryBuilder instance.
     *
     * @see where()
     */
    public function orWhere($where)
    {
        $where = $this->getQueryPart('where');
        $args = func_get_args();

        if ($where instanceof CompositeExpression && $where->getType() === CompositeExpression::TYPE_OR) {
            $where->addMultiple($args);
        } else {
            array_unshift($args, $where);
            $where = new CompositeExpression(CompositeExpression::TYPE_OR, $args);
        }

        return $this->add('where', $where, true);
    }

    /**
     * Specifies a grouping over the results of the query.
     * Replaces any previously specified groupings, if any.
     *
     * <code>
     *     $qb = $conn->createQueryBuilder()
     *         ->select('u.name')
     *         ->from('users', 'u')
     *         ->groupBy('u.id');
     * </code>
     *
     * @param mixed $groupBy The grouping expression.
     *
     * @return \Doctrine\DBAL\Query\QueryBuilder This QueryBuilder instance.
     */
    public function groupBy($groupBy)
    {
        if (empty($groupBy)) {
            return $this;
        }

        $groupBy = is_array($groupBy) ? $groupBy : func_get_args();

        return $this->add('groupBy', $groupBy, false);
    }


    /**
     * Adds a grouping expression to the query.
     *
     * <code>
     *     $qb = $conn->createQueryBuilder()
     *         ->select('u.name')
     *         ->from('users', 'u')
     *         ->groupBy('u.lastLogin');
     *         ->addGroupBy('u.createdAt')
     * </code>
     *
     * @param mixed $groupBy The grouping expression.
     *
     * @return \Doctrine\DBAL\Query\QueryBuilder This QueryBuilder instance.
     */
    public function addGroupBy($groupBy)
    {
        if (empty($groupBy)) {
            return $this;
        }

        $groupBy = is_array($groupBy) ? $groupBy : func_get_args();

        return $this->add('groupBy', $groupBy, true);
    }

    /**
     * Specifies a restriction over the groups of the query.
     * Replaces any previous having restrictions, if any.
     *
     * @param mixed $having The restriction over the groups.
     *
     * @return \Doctrine\DBAL\Query\QueryBuilder This QueryBuilder instance.
     */
    public function having($having)
    {
        if ( ! (func_num_args() == 1 && $having instanceof CompositeExpression)) {
            $having = new CompositeExpression(CompositeExpression::TYPE_AND, func_get_args());
        }

        return $this->add('having', $having);
    }

    /**
     * Adds a restriction over the groups of the query, forming a logical
     * conjunction with any existing having restrictions.
     *
     * @param mixed $having The restriction to append.
     *
     * @return \Doctrine\DBAL\Query\QueryBuilder This QueryBuilder instance.
     */
    public function andHaving($having)
    {
        $having = $this->getQueryPart('having');
        $args = func_get_args();

        if ($having instanceof CompositeExpression && $having->getType() === CompositeExpression::TYPE_AND) {
            $having->addMultiple($args);
        } else {
            array_unshift($args, $having);
            $having = new CompositeExpression(CompositeExpression::TYPE_AND, $args);
        }

        return $this->add('having', $having);
    }

    /**
     * Adds a restriction over the groups of the query, forming a logical
     * disjunction with any existing having restrictions.
     *
     * @param mixed $having The restriction to add.
     *
     * @return \Doctrine\DBAL\Query\QueryBuilder This QueryBuilder instance.
     */
    public function orHaving($having)
    {
        $having = $this->getQueryPart('having');
        $args = func_get_args();

        if ($having instanceof CompositeExpression && $having->getType() === CompositeExpression::TYPE_OR) {
            $having->addMultiple($args);
        } else {
            array_unshift($args, $having);
            $having = new CompositeExpression(CompositeExpression::TYPE_OR, $args);
        }

        return $this->add('having', $having);
    }

    /**
     * Specifies an ordering for the query results.
     * Replaces any previously specified orderings, if any.
     *
     * @param string $sort  The ordering expression.
     * @param string $order The ordering direction.
     *
     * @return \Doctrine\DBAL\Query\QueryBuilder This QueryBuilder instance.
     */
    public function orderBy($sort, $order = null)
    {
        return $this->add('orderBy', $sort . ' ' . (! $order ? 'ASC' : $order), false);
    }

    /**
     * Adds an ordering to the query results.
     *
     * @param string $sort  The ordering expression.
     * @param string $order The ordering direction.
     *
     * @return \Doctrine\DBAL\Query\QueryBuilder This QueryBuilder instance.
     */
    public function addOrderBy($sort, $order = null)
    {
        return $this->add('orderBy', $sort . ' ' . (! $order ? 'ASC' : $order), true);
    }

    /**
     * Gets a query part by its name.
     *
     * @param string $queryPartName
     *
     * @return mixed
     */
    public function getQueryPart($queryPartName)
    {
        return $this->sqlParts[$queryPartName];
    }

    /**
     * Gets all query parts.
     *
     * @return array
     */
    public function getQueryParts()
    {
        return $this->sqlParts;
    }

    /**
     * Resets SQL parts.
     *
     * @param array|null $queryPartNames
     *
     * @return \Doctrine\DBAL\Query\QueryBuilder This QueryBuilder instance.
     */
    public function resetQueryParts($queryPartNames = null)
    {
        if (is_null($queryPartNames)) {
            $queryPartNames = array_keys($this->sqlParts);
        }

        foreach ($queryPartNames as $queryPartName) {
            $this->resetQueryPart($queryPartName);
        }

        return $this;
    }

    /**
     * Resets a single SQL part.
     *
     * @param string $queryPartName
     *
     * @return \Doctrine\DBAL\Query\QueryBuilder This QueryBuilder instance.
     */
    public function resetQueryPart($queryPartName)
    {
        $this->sqlParts[$queryPartName] = is_array($this->sqlParts[$queryPartName])
            ? array() : null;

        $this->state = self::STATE_DIRTY;

        return $this;
    }

    /**
     * @return string
     *
     * @throws \Doctrine\DBAL\Query\QueryException
     */
    private function getSQLForSelect()
    {
        $query = 'SELECT ' . implode(', ', $this->sqlParts['select']) . ' FROM ';

        $fromClauses = array();
        $knownAliases = array();

        // Loop through all FROM clauses
        foreach ($this->sqlParts['from'] as $from) {
            $knownAliases[$from['alias']] = true;
            $fromClause = $from['table'] . ' ' . $from['alias']
                . $this->getSQLForJoins($from['alias'], $knownAliases);

            $fromClauses[$from['alias']] = $fromClause;
        }

        foreach ($this->sqlParts['join'] as $fromAlias => $joins) {
            if ( ! isset($knownAliases[$fromAlias]) ) {
                throw QueryException::unknownAlias($fromAlias, array_keys($knownAliases));
            }
        }

        $query .= implode(', ', $fromClauses)
                . ($this->sqlParts['where'] !== null ? ' WHERE ' . ((string) $this->sqlParts['where']) : '')
                . ($this->sqlParts['groupBy'] ? ' GROUP BY ' . implode(', ', $this->sqlParts['groupBy']) : '')
                . ($this->sqlParts['having'] !== null ? ' HAVING ' . ((string) $this->sqlParts['having']) : '')
                . ($this->sqlParts['orderBy'] ? ' ORDER BY ' . implode(', ', $this->sqlParts['orderBy']) : '');

        return ($this->maxResults === null && $this->firstResult == null)
            ? $query
            : $this->connection->getDatabasePlatform()->modifyLimitQuery($query, $this->maxResults, $this->firstResult);
    }

    /**
     * Converts this instance into an UPDATE string in SQL.
     *
     * @return string
     */
    private function getSQLForUpdate()
    {
        $table = $this->sqlParts['from']['table'] . ($this->sqlParts['from']['alias'] ? ' ' . $this->sqlParts['from']['alias'] : '');
        $query = 'UPDATE ' . $table
               . ' SET ' . implode(", ", $this->sqlParts['set'])
               . ($this->sqlParts['where'] !== null ? ' WHERE ' . ((string) $this->sqlParts['where']) : '');

        return $query;
    }

    /**
     * Converts this instance into a DELETE string in SQL.
     *
     * @return string
     */
    private function getSQLForDelete()
    {
        $table = $this->sqlParts['from']['table'] . ($this->sqlParts['from']['alias'] ? ' ' . $this->sqlParts['from']['alias'] : '');
        $query = 'DELETE FROM ' . $table . ($this->sqlParts['where'] !== null ? ' WHERE ' . ((string) $this->sqlParts['where']) : '');

        return $query;
    }

    /**
     * Gets a string representation of this QueryBuilder which corresponds to
     * the final SQL query being constructed.
     *
     * @return string The string representation of this QueryBuilder.
     */
    public function __toString()
    {
        return $this->getSQL();
    }

    /**
     * Creates a new named parameter and bind the value $value to it.
     *
     * This method provides a shortcut for PDOStatement::bindValue
     * when using prepared statements.
     *
     * The parameter $value specifies the value that you want to bind. If
     * $placeholder is not provided bindValue() will automatically create a
     * placeholder for you. An automatic placeholder will be of the name
     * ':dcValue1', ':dcValue2' etc.
     *
     * For more information see {@link http://php.net/pdostatement-bindparam}
     *
     * Example:
     * <code>
     * $value = 2;
     * $q->eq( 'id', $q->bindValue( $value ) );
     * $stmt = $q->executeQuery(); // executed with 'id = 2'
     * </code>
     *
     * @license New BSD License
     * @link http://www.zetacomponents.org
     *
     * @param mixed  $value
     * @param mixed  $type
     * @param string $placeHolder The name to bind with. The string must start with a colon ':'.
     *
     * @return string the placeholder name used.
     */
    public function createNamedParameter( $value, $type = \PDO::PARAM_STR, $placeHolder = null )
    {
        if ( $placeHolder === null ) {
            $this->boundCounter++;
            $placeHolder = ":dcValue" . $this->boundCounter;
        }
        $this->setParameter(substr($placeHolder, 1), $value, $type);

        return $placeHolder;
    }

    /**
     * Creates a new positional parameter and bind the given value to it.
     *
     * Attention: If you are using positional parameters with the query builder you have
     * to be very careful to bind all parameters in the order they appear in the SQL
     * statement , otherwise they get bound in the wrong order which can lead to serious
     * bugs in your code.
     *
     * Example:
     * <code>
     *  $qb = $conn->createQueryBuilder();
     *  $qb->select('u.*')
     *     ->from('users', 'u')
     *     ->where('u.username = ' . $qb->createPositionalParameter('Foo', PDO::PARAM_STR))
     *     ->orWhere('u.username = ' . $qb->createPositionalParameter('Bar', PDO::PARAM_STR))
     * </code>
     *
     * @param mixed   $value
     * @param integer $type
     *
     * @return string
     */
    public function createPositionalParameter($value, $type = \PDO::PARAM_STR)
    {
        $this->boundCounter++;
        $this->setParameter($this->boundCounter, $value, $type);
        return "?";
    }

    /**
     * @param string $fromAlias
     * @param array  $knownAliases
     *
     * @return string
     */
    private function getSQLForJoins($fromAlias, array &$knownAliases)
    {
        $sql = '';

        if (isset($this->sqlParts['join'][$fromAlias])) {
            foreach ($this->sqlParts['join'][$fromAlias] as $join) {
                $sql .= ' ' . strtoupper($join['joinType'])
                      . ' JOIN ' . $join['joinTable'] . ' ' . $join['joinAlias']
                      . ' ON ' . ((string) $join['joinCondition']);
                $knownAliases[$join['joinAlias']] = true;

                $sql .= $this->getSQLForJoins($join['joinAlias'], $knownAliases);
            }
        }

        return $sql;
    }

    /**
     * Deep clone of all expression objects in the SQL parts.
     *
     * @return void
     */
    public function __clone()
    {
        foreach ($this->sqlParts as $part => $elements) {
            if (is_array($this->sqlParts[$part])) {
                foreach ($this->sqlParts[$part] as $idx => $element) {
                    if (is_object($element)) {
                        $this->sqlParts[$part][$idx] = clone $element;
                    }
                }
            } else if (is_object($elements)) {
                $this->sqlParts[$part] = clone $elements;
            }
        }

        foreach ($this->params as $name => $param) {
            if(is_object($param)){
                $this->params[$name] = clone $param;
            }
        }
    }
}

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