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