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107 lines
2.4 KiB
PHP
107 lines
2.4 KiB
PHP
<?php
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/**
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* @package Joomla.Platform
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* @subpackage Database
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*
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* @copyright Copyright (C) 2005 - 2013 Open Source Matters, Inc. All rights reserved.
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* @license GNU General Public License version 2 or later; see LICENSE
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*/
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defined('JPATH_PLATFORM') or die;
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/**
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* Query Building Class.
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*
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* @package Joomla.Platform
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* @subpackage Database
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* @since 11.1
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*/
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class JDatabaseQueryMysqli extends JDatabaseQuery implements JDatabaseQueryLimitable
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{
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/**
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* @var interger The offset for the result set.
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* @since 12.1
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*/
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protected $offset;
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/**
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* @var integer The limit for the result set.
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* @since 12.1
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*/
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protected $limit;
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/**
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* Method to modify a query already in string format with the needed
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* additions to make the query limited to a particular number of
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* results, or start at a particular offset.
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*
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* @param string $query The query in string format
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* @param integer $limit The limit for the result set
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* @param integer $offset The offset for the result set
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*
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* @return string
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*
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* @since 12.1
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*/
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public function processLimit($query, $limit, $offset = 0)
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{
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if ($limit > 0 || $offset > 0)
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{
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$query .= ' LIMIT ' . $offset . ', ' . $limit;
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}
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return $query;
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}
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/**
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* Concatenates an array of column names or values.
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*
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* @param array $values An array of values to concatenate.
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* @param string $separator As separator to place between each value.
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*
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* @return string The concatenated values.
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*
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* @since 11.1
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*/
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public function concatenate($values, $separator = null)
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{
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if ($separator)
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{
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$concat_string = 'CONCAT_WS(' . $this->quote($separator);
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foreach ($values as $value)
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{
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$concat_string .= ', ' . $value;
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}
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return $concat_string . ')';
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}
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else
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{
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return 'CONCAT(' . implode(',', $values) . ')';
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}
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}
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/**
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* Sets the offset and limit for the result set, if the database driver supports it.
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*
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* Usage:
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* $query->setLimit(100, 0); (retrieve 100 rows, starting at first record)
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* $query->setLimit(50, 50); (retrieve 50 rows, starting at 50th record)
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*
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* @param integer $limit The limit for the result set
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* @param integer $offset The offset for the result set
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*
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* @return JDatabaseQuery Returns this object to allow chaining.
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*
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* @since 12.1
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*/
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public function setLimit($limit = 0, $offset = 0)
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{
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$this->limit = (int) $limit;
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$this->offset = (int) $offset;
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return $this;
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}
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}
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