class.ilAccessibilityTableDatabaseDataProvider.php

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<?php
/* Copyright (c) 1998-2019 ILIAS open source, Extended GPL, see docs/LICENSE */
 
abstract class ilAccessibilityTableDatabaseDataProvider implements ilAccessibilityTableDataProvider
{
    protected $db;
 
    public function __construct(ilDBInterface $db)
    {
        $this->db = $db;
    }
 
    abstract protected function getSelectPart(array $params, array $filter) : string;
 
    abstract protected function getFromPart(array $params, array $filter) : string;
 
    abstract protected function getWherePart(array $params, array $filter) : string;
 
    abstract protected function getGroupByPart(array $params, array $filter) : string;
 
    abstract protected function getHavingPart(array $params, array $filter) : string;
 
    abstract protected function getOrderByPart(array $params, array $filter) : string;
 
    public function getList(array $params, array $filter) : array
    {
        $data = [
            'items' => [],
            'cnt' => 0
        ];
 
        $select = $this->getSelectPart($params, $filter);
        $where = $this->getWherePart($params, $filter);
        $from = $this->getFromPart($params, $filter);
        $order = $this->getOrderByPart($params, $filter);
        $group = $this->getGroupByPart($params, $filter);
        $having = $this->getHavingPart($params, $filter);
 
        if (isset($params['limit'])) {
            if (!is_numeric($params['limit'])) {
                throw new InvalidArgumentException('Please provide a valid numerical limit.');
            }
 
            if (!isset($params['offset'])) {
                $params['offset'] = 0;
            } else {
                if (!is_numeric($params['offset'])) {
                    throw new InvalidArgumentException('Please provide a valid numerical offset.');
                }
            }
 
            $this->db->setLimit($params['limit'], $params['offset']);
        }
 
        $where = strlen($where) ? 'WHERE ' . $where : '';
        $query = "SELECT {$select} FROM {$from} {$where}";
 
        if (strlen($group)) {
            $query .= " GROUP BY {$group}";
        }
 
        if (strlen($having)) {
            $query .= " HAVING {$having}";
        }
 
        if (strlen($order)) {
            $query .= " ORDER BY {$order}";
        }
 
        $res = $this->db->query($query);
        while ($row = $this->db->fetchAssoc($res)) {
            $data['items'][] = $row;
        }
 
        if (isset($params['limit'])) {
            $cnt_sql = "SELECT COUNT(*) cnt FROM ({$query}) subquery";
            $row_cnt = $this->db->fetchAssoc($this->db->query($cnt_sql));
            $data['cnt'] = $row_cnt['cnt'];
        }
 
        return $data;
    }
}