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130 lines
2.5 KiB
PHP
130 lines
2.5 KiB
PHP
<?php
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/**
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*
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* This file is part of the phpBB Forum Software package.
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*
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* @copyright (c) phpBB Limited <https://www.phpbb.com>
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* @license GNU General Public License, version 2 (GPL-2.0)
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*
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* For full copyright and license information, please see
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* the docs/CREDITS.txt file.
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*
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*/
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namespace phpbb\db\driver;
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/**
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* Abstract MySQL Database Base Abstraction Layer
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*/
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abstract class mysql_base extends \phpbb\db\driver\driver
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{
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/**
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* {@inheritDoc}
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*/
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public function sql_concatenate($expr1, $expr2)
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{
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return 'CONCAT(' . $expr1 . ', ' . $expr2 . ')';
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}
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/**
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* Build LIMIT query
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*/
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function _sql_query_limit($query, $total, $offset = 0, $cache_ttl = 0)
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{
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$this->query_result = false;
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// if $total is set to 0 we do not want to limit the number of rows
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if ($total == 0)
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{
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// MySQL 4.1+ no longer supports -1 in limit queries
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$total = '18446744073709551615';
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}
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$query .= "\n LIMIT " . ((!empty($offset)) ? $offset . ', ' . $total : $total);
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return $this->sql_query($query, $cache_ttl);
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}
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/**
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* {@inheritDoc}
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*/
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function get_estimated_row_count($table_name)
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{
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$table_status = $this->get_table_status($table_name);
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if (isset($table_status['Engine']))
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{
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if ($table_status['Engine'] === 'MyISAM')
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{
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return $table_status['Rows'];
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}
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else if ($table_status['Engine'] === 'InnoDB' && $table_status['Rows'] > 100000)
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{
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return '~' . $table_status['Rows'];
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}
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}
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return parent::get_row_count($table_name);
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}
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/**
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* {@inheritDoc}
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*/
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function get_row_count($table_name)
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{
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$table_status = $this->get_table_status($table_name);
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if (isset($table_status['Engine']) && $table_status['Engine'] === 'MyISAM')
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{
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return $table_status['Rows'];
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}
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return parent::get_row_count($table_name);
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}
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/**
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* Gets some information about the specified table.
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*
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* @param string $table_name Table name
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*
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* @return array
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*
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* @access protected
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*/
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function get_table_status($table_name)
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{
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$sql = "SHOW TABLE STATUS
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LIKE '" . $this->sql_escape($table_name) . "'";
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$result = $this->sql_query($sql);
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$table_status = $this->sql_fetchrow($result);
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$this->sql_freeresult($result);
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return $table_status;
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}
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/**
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* Build LIKE expression
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* @access private
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*/
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function _sql_like_expression($expression)
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{
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return $expression;
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}
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/**
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* Build db-specific query data
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* @access private
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*/
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function _sql_custom_build($stage, $data)
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{
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switch ($stage)
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{
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case 'FROM':
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$data = '(' . $data . ')';
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break;
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}
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return $data;
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}
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}
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