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<?php
/**
* Kunena Component
* @package Kunena.Framework
* @subpackage Database
*
* @copyright (C) 2008 - 2016 Kunena Team. All rights reserved.
* @license http://www.gnu.org/copyleft/gpl.html GNU/GPL
* @link https://www.kunena.org
**/
defined ( '_JEXEC' ) or die ();
/**
* Class KunenaDatabaseFinder
*/
abstract class KunenaDatabaseFinder
{
/**
* Table associated with the model.
*
* @var string
*/
protected $table;
/**
* @var string
*/
protected $primaryKey = 'id';
/**
* @var JDatabaseQuery
*/
protected $query;
/**
* @var JDatabase
*/
protected $db;
protected $start = 0;
protected $limit = 20;
protected $skip = false;
/**
* Constructor.
*/
public function __construct()
{
if (!$this->table)
{
throw new DomainException('Table name missing from ' . get_class($this));
}
$this->db = JFactory::getDbo();
$this->query = $this->db->getQuery(true);
$this->query->from($this->table . ' AS a');
}
/**
* Set limitstart for the query.
*
* @param int $limitstart
*
* @return $this
*/
public function start($limitstart = 0)
{
$this->start = $limitstart;
return $this;
}
/**
* Set limit to the query.
*
* If this function isn't used, Kunena will use threads per page configuration setting.
*
* @param int $limit
*
* @return $this
*/
public function limit($limit = null)
{
if (!is_null($limit))
{
$this->limit = $limit;
}
return $this;
}
/**
* Set order by field and direction.
*
* This function can be used more than once to chain order by.
*
* @param string $by
* @param int $direction
* @param string $alias
*
* @return $this
*/
public function order($by, $direction = 1, $alias = 'a')
{
$direction = $direction > 0 ? 'ASC' : 'DESC';
$by = $alias . '.' . $this->db->quoteName($by);
$this->query->order("{$by} {$direction}");
return $this;
}
/**
* Filter by field.
*
* @param string $field Field name.
* @param string $operation Operation (>|>=|<|<=|=|IN|NOT IN)
* @param string|array $value Value.
*
* @return $this
*/
public function where($field, $operation, $value)
{
$operation = strtoupper($operation);
switch ($operation)
{
case '>':
case '>=':
case '<':
case '<=':
case '=':
$this->query->where("{$this->db->quoteName($field)} {$operation} {$this->db->quote($value)}");
break;
case 'BETWEEN':
list($a, $b) = (array) $value;
$this->query->where("{$this->db->quoteName($field)} BETWEEN {$this->db->quote($a)} AND {$this->db->quote($b)}");
break;
case 'IN':
case 'NOT IN':
$value = (array) $value;
if (empty($value))
{
// WHERE field IN (nothing).
$this->query->where('0');
}
else
{
$list = implode(',', $value);
$this->query->where("{$this->db->quoteName($field)} {$operation} ({$list})");
}
break;
}
return $this;
}
/**
* Get items.
*
* Derived classes should generally override this function to return correct objects.
*
* @return array
*/
public function find()
{
if ($this->skip)
{
return array();
}
$query = clone $this->query;
$this->build($query);
$query->select('a.' . $this->primaryKey);
$this->db->setQuery($query, $this->start, $this->limit);
$results = (array) $this->db->loadColumn();
KunenaError::checkDatabaseError();
return $results;
}
/**
* Count items.
*
* @return int
*/
public function count()
{
$query = clone $this->query;
$this->build($query);
$query->select('COUNT(*)');
$this->db->setQuery($query);
$count = (int) $this->db->loadResult();
KunenaError::checkDatabaseError();
return $count;
}
/**
* Override to include your own static filters.
*
* @param JDatabaseQuery $query
*
* @return void
*/
protected function build(JDatabaseQuery $query)
{
}
}