266 Zeilen
8,4 KiB
PHP
266 Zeilen
8,4 KiB
PHP
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<?php
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/**
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* Zend Framework
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*
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* LICENSE
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*
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* This source file is subject to the new BSD license that is bundled
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* with this package in the file LICENSE.txt.
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* It is also available through the world-wide-web at this URL:
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* http://framework.zend.com/license/new-bsd
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* If you did not receive a copy of the license and are unable to
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* obtain it through the world-wide-web, please send an email
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* to license@zend.com so we can send you a copy immediately.
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*
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* @category Zend
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* @package Zend_Paginator
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* @copyright Copyright (c) 2005-2011 Zend Technologies USA Inc. (http://www.zend.com)
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* @license http://framework.zend.com/license/new-bsd New BSD License
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* @version $Id$
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*/
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/**
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* @see Zend_Paginator_Adapter_Interface
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*/
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require_once 'Zend/Paginator/Adapter/Interface.php';
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/**
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* @see Zend_Db
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*/
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require_once 'Zend/Db.php';
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/**
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* @see Zend_Db_Select
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*/
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require_once 'Zend/Db/Select.php';
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/**
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* @category Zend
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* @package Zend_Paginator
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* @copyright Copyright (c) 2005-2011 Zend Technologies USA Inc. (http://www.zend.com)
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* @license http://framework.zend.com/license/new-bsd New BSD License
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*/
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class Zend_Paginator_Adapter_DbSelect implements Zend_Paginator_Adapter_Interface
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{
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/**
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* Name of the row count column
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*
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* @var string
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*/
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const ROW_COUNT_COLUMN = 'zend_paginator_row_count';
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/**
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* The COUNT query
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*
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* @var Zend_Db_Select
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*/
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protected $_countSelect = null;
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/**
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* Database query
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*
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* @var Zend_Db_Select
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*/
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protected $_select = null;
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/**
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* Total item count
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*
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* @var integer
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*/
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protected $_rowCount = null;
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/**
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* Constructor.
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*
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* @param Zend_Db_Select $select The select query
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*/
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public function __construct(Zend_Db_Select $select)
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{
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$this->_select = $select;
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}
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/**
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* Sets the total row count, either directly or through a supplied
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* query. Without setting this, {@link getPages()} selects the count
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* as a subquery (SELECT COUNT ... FROM (SELECT ...)). While this
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* yields an accurate count even with queries containing clauses like
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* LIMIT, it can be slow in some circumstances. For example, in MySQL,
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* subqueries are generally slow when using the InnoDB storage engine.
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* Users are therefore encouraged to profile their queries to find
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* the solution that best meets their needs.
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*
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* @param Zend_Db_Select|integer $totalRowCount Total row count integer
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* or query
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* @return Zend_Paginator_Adapter_DbSelect $this
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* @throws Zend_Paginator_Exception
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*/
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public function setRowCount($rowCount)
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{
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if ($rowCount instanceof Zend_Db_Select) {
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$columns = $rowCount->getPart(Zend_Db_Select::COLUMNS);
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$countColumnPart = empty($columns[0][2])
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? $columns[0][1]
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: $columns[0][2];
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if ($countColumnPart instanceof Zend_Db_Expr) {
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$countColumnPart = $countColumnPart->__toString();
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}
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$rowCountColumn = $this->_select->getAdapter()->foldCase(self::ROW_COUNT_COLUMN);
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// The select query can contain only one column, which should be the row count column
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if (false === strpos($countColumnPart, $rowCountColumn)) {
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/**
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* @see Zend_Paginator_Exception
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*/
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require_once 'Zend/Paginator/Exception.php';
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throw new Zend_Paginator_Exception('Row count column not found');
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}
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$result = $rowCount->query(Zend_Db::FETCH_ASSOC)->fetch();
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$this->_rowCount = count($result) > 0 ? $result[$rowCountColumn] : 0;
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} else if (is_integer($rowCount)) {
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$this->_rowCount = $rowCount;
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} else {
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/**
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* @see Zend_Paginator_Exception
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*/
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require_once 'Zend/Paginator/Exception.php';
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throw new Zend_Paginator_Exception('Invalid row count');
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}
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return $this;
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}
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/**
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* Returns an array of items for a page.
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*
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* @param integer $offset Page offset
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* @param integer $itemCountPerPage Number of items per page
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* @return array
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*/
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public function getItems($offset, $itemCountPerPage)
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{
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$this->_select->limit($itemCountPerPage, $offset);
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return $this->_select->query()->fetchAll();
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}
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/**
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* Returns the total number of rows in the result set.
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*
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* @return integer
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*/
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public function count()
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{
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if ($this->_rowCount === null) {
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$this->setRowCount(
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$this->getCountSelect()
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);
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}
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return $this->_rowCount;
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}
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/**
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* Get the COUNT select object for the provided query
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*
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* TODO: Have a look at queries that have both GROUP BY and DISTINCT specified.
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* In that use-case I'm expecting problems when either GROUP BY or DISTINCT
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* has one column.
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*
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* @return Zend_Db_Select
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*/
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public function getCountSelect()
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{
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/**
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* We only need to generate a COUNT query once. It will not change for
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* this instance.
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*/
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if ($this->_countSelect !== null) {
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return $this->_countSelect;
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}
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$rowCount = clone $this->_select;
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$rowCount->__toString(); // Workaround for ZF-3719 and related
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$db = $rowCount->getAdapter();
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$countColumn = $db->quoteIdentifier($db->foldCase(self::ROW_COUNT_COLUMN));
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$countPart = 'COUNT(1) AS ';
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$groupPart = null;
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$unionParts = $rowCount->getPart(Zend_Db_Select::UNION);
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/**
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* If we're dealing with a UNION query, execute the UNION as a subquery
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* to the COUNT query.
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*/
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if (!empty($unionParts)) {
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$expression = new Zend_Db_Expr($countPart . $countColumn);
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$rowCount = $db->select()->from($rowCount, $expression);
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} else {
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$columnParts = $rowCount->getPart(Zend_Db_Select::COLUMNS);
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$groupParts = $rowCount->getPart(Zend_Db_Select::GROUP);
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$havingParts = $rowCount->getPart(Zend_Db_Select::HAVING);
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$isDistinct = $rowCount->getPart(Zend_Db_Select::DISTINCT);
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/**
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* If there is more than one column AND it's a DISTINCT query, more
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* than one group, or if the query has a HAVING clause, then take
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* the original query and use it as a subquery os the COUNT query.
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*/
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if (($isDistinct && count($columnParts) > 1) || count($groupParts) > 1 || !empty($havingParts)) {
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$rowCount->reset(Zend_Db_Select::ORDER);
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$rowCount = $db->select()->from($rowCount);
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} else if ($isDistinct) {
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$part = $columnParts[0];
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if ($part[1] !== Zend_Db_Select::SQL_WILDCARD && !($part[1] instanceof Zend_Db_Expr)) {
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$column = $db->quoteIdentifier($part[1], true);
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if (!empty($part[0])) {
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$column = $db->quoteIdentifier($part[0], true) . '.' . $column;
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}
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$groupPart = $column;
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}
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} else if (!empty($groupParts) && $groupParts[0] !== Zend_Db_Select::SQL_WILDCARD &&
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!($groupParts[0] instanceof Zend_Db_Expr)) {
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$groupPart = $db->quoteIdentifier($groupParts[0], true);
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}
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/**
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* If the original query had a GROUP BY or a DISTINCT part and only
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* one column was specified, create a COUNT(DISTINCT ) query instead
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* of a regular COUNT query.
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*/
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if (!empty($groupPart)) {
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$countPart = 'COUNT(DISTINCT ' . $groupPart . ') AS ';
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}
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/**
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* Create the COUNT part of the query
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*/
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$expression = new Zend_Db_Expr($countPart . $countColumn);
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$rowCount->reset(Zend_Db_Select::COLUMNS)
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->reset(Zend_Db_Select::ORDER)
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->reset(Zend_Db_Select::LIMIT_OFFSET)
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->reset(Zend_Db_Select::GROUP)
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->reset(Zend_Db_Select::DISTINCT)
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->reset(Zend_Db_Select::HAVING)
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->columns($expression);
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}
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$this->_countSelect = $rowCount;
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return $rowCount;
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}
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}
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