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1<?php
2/**
3*
4* This file is part of the phpBB Forum Software package.
5*
6* @copyright (c) phpBB Limited <https://www.phpbb.com>
7* @license GNU General Public License, version 2 (GPL-2.0)
8*
9* For full copyright and license information, please see
10* the docs/CREDITS.txt file.
11*
12*/
13
14namespace phpbb\db\driver;
15
16/**
17* Abstract MySQL Database Base Abstraction Layer
18*/
19abstract class mysql_base extends \phpbb\db\driver\driver
20{
21    /**
22    * {@inheritDoc}
23    */
24    public function sql_concatenate($expr1, $expr2)
25    {
26        return 'CONCAT(' . $expr1 . ', ' . $expr2 . ')';
27    }
28
29    /**
30     * {@inheritDoc}
31     */
32    protected function _sql_query_limit(string $query, int $total, int $offset = 0, int $cache_ttl = 0)
33    {
34        $this->query_result = false;
35
36        // if $total is set to 0 we do not want to limit the number of rows
37        if ($total == 0)
38        {
39            // MySQL 4.1+ no longer supports -1 in limit queries
40            $total = '18446744073709551615';
41        }
42
43        $query .= "\n LIMIT " . ((!empty($offset)) ? $offset . ', ' . $total : $total);
44
45        return $this->sql_query($query, $cache_ttl);
46    }
47
48    /**
49    * {@inheritDoc}
50    */
51    function get_estimated_row_count($table_name)
52    {
53        $table_status = $this->get_table_status($table_name);
54
55        if (isset($table_status['Engine']))
56        {
57            if ($table_status['Engine'] === 'MyISAM')
58            {
59                return $table_status['Rows'];
60            }
61            else if ($table_status['Engine'] === 'InnoDB' && $table_status['Rows'] > 100000)
62            {
63                return '~' . $table_status['Rows'];
64            }
65        }
66
67        return parent::get_row_count($table_name);
68    }
69
70    /**
71    * {@inheritDoc}
72    */
73    function get_row_count($table_name)
74    {
75        $table_status = $this->get_table_status($table_name);
76
77        if (isset($table_status['Engine']) && $table_status['Engine'] === 'MyISAM')
78        {
79            return $table_status['Rows'];
80        }
81
82        return parent::get_row_count($table_name);
83    }
84
85    /**
86    * Gets some information about the specified table.
87    *
88    * @param string $table_name        Table name
89    *
90    * @return array
91    *
92    * @access protected
93    */
94    function get_table_status($table_name)
95    {
96        $sql = "SHOW TABLE STATUS
97            LIKE '" . $this->sql_escape($table_name) . "'";
98        $result = $this->sql_query($sql);
99        $table_status = $this->sql_fetchrow($result);
100        $this->sql_freeresult($result);
101
102        return $table_status;
103    }
104
105    /**
106    * {@inheritDoc}
107    */
108    protected function _sql_custom_build(string $stage, $data)
109    {
110        if ($stage === 'FROM' && is_string($data))
111        {
112            $data = '(' . $data . ')';
113        }
114
115        return $data;
116    }
117}