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<?php |
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/** |
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* |
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* Precise Similar Topics |
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* |
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* @copyright (c) 2018 Matt Friedman |
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* @license GNU General Public License, version 2 (GPL-2.0) |
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* |
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*/ |
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namespace vse\similartopics\driver; |
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/** |
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* This class handles similar topics queries for MySQLi dbms |
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*/ |
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class mysqli implements driver_interface |
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{ |
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/** @var \phpbb\db\driver\driver_interface */ |
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protected $db; |
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/** @var string */ |
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protected $engine; |
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/** |
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* Constructor |
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* |
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* @param \phpbb\db\driver\driver_interface $db |
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*/ |
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public function __construct(\phpbb\db\driver\driver_interface $db) |
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{ |
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$this->db = $db; |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function get_name() |
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{ |
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return 'mysqli'; |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function get_type() |
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{ |
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return 'mysql'; |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function get_query($topic_id, $topic_title, $length, $sensitivity) |
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{ |
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return array( |
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'SELECT' => "f.forum_id, f.forum_name, t.*, |
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MATCH (t.topic_title) AGAINST ('" . $this->db->sql_escape($topic_title) . "') AS score", |
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'FROM' => array( |
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TOPICS_TABLE => 't', |
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), |
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'LEFT_JOIN' => array( |
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array( |
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'FROM' => array(FORUMS_TABLE => 'f'), |
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'ON' => 'f.forum_id = t.forum_id', |
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), |
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), |
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'WHERE' => "MATCH (t.topic_title) AGAINST ('" . $this->db->sql_escape($topic_title) . "') >= " . (float) $sensitivity . ' |
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AND t.topic_status <> ' . ITEM_MOVED . ' |
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AND t.topic_visibility = ' . ITEM_APPROVED . ' |
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AND t.topic_time > (UNIX_TIMESTAMP() - ' . (int) $length . ') |
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AND t.topic_id <> ' . (int) $topic_id, |
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); |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function is_supported() |
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{ |
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// FULLTEXT is supported on InnoDB since MySQL 5.6.4 according to |
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// http://dev.mysql.com/doc/refman/5.6/en/innodb-storage-engine.html |
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return $this->is_mysql() && ($this->get_engine() === 'myisam' || ($this->get_engine() === 'innodb' && phpbb_version_compare($this->db->sql_server_info(true), '5.6.4', '>='))); |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function is_fulltext($column = 'topic_title', $table = TOPICS_TABLE) |
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{ |
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foreach ($this->get_fulltext_indexes($column, $table) as $index) |
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{ |
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if ($index === $column) |
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{ |
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return true; |
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} |
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} |
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return false; |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function get_fulltext_indexes($column = 'topic_title', $table = TOPICS_TABLE) |
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{ |
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$indexes = array(); |
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if (!$this->is_supported()) |
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{ |
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return $indexes; |
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} |
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$sql = 'SHOW INDEX |
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FROM ' . $this->db->sql_escape($table); |
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$result = $this->db->sql_query($sql); |
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while ($row = $this->db->sql_fetchrow($result)) |
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{ |
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// Older MySQL versions didn't use Index_type, so fallback to Comment |
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$index_type = isset($row['Index_type']) ? $row['Index_type'] : $row['Comment']; |
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if ($index_type === 'FULLTEXT' && $row['Key_name'] === $column) |
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{ |
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$indexes[] = $row['Key_name']; |
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} |
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} |
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$this->db->sql_freeresult($result); |
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return $indexes; |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function create_fulltext_index($column = 'topic_title', $table = TOPICS_TABLE) |
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{ |
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if (!$this->is_fulltext($column, $table)) |
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{ |
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// First see if we need to update the table engine to support fulltext indexes |
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if (!$this->is_supported()) |
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{ |
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$sql = 'ALTER TABLE ' . $this->db->sql_escape($table) . ' ENGINE = MYISAM'; |
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$this->db->sql_query($sql); |
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$this->set_engine(); |
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} |
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$sql = 'ALTER TABLE ' . $this->db->sql_escape($table) . ' |
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ADD FULLTEXT (' . $this->db->sql_escape($column) . ')'; |
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$this->db->sql_query($sql); |
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} |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function get_engine() |
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{ |
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return $this->engine !== null ? $this->engine : $this->set_engine(); |
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} |
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/** |
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* Set the database storage engine name |
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* |
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* @access protected |
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* @return string The storage engine name |
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*/ |
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protected function set_engine() |
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{ |
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$this->engine = ''; |
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if ($this->is_mysql()) |
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{ |
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$info = $this->get_table_info(); |
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// Modern MySQL uses 'Engine', but older may still use 'Type' |
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foreach (array('Engine', 'Type') as $name) |
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{ |
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if (isset($info[$name])) |
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{ |
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$this->engine = strtolower($info[$name]); |
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break; |
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} |
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} |
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} |
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return $this->engine; |
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} |
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/** |
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* Get topics table information |
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* |
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* @access protected |
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* @param string $table Name of the table |
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* @return mixed Array with the table info, false if the table does not exist |
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*/ |
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protected function get_table_info($table = TOPICS_TABLE) |
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{ |
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$result = $this->db->sql_query('SHOW TABLE STATUS LIKE \'' . $this->db->sql_escape($table) . '\''); |
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$info = $this->db->sql_fetchrow($result); |
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$this->db->sql_freeresult($result); |
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return $info; |
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} |
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/** |
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* Check if the database is using MySQL |
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* |
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* @access public |
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* @return bool True if is mysql, false otherwise |
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*/ |
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protected function is_mysql() |
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{ |
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return ($this->db->get_sql_layer() === 'mysql4' || $this->db->get_sql_layer() === 'mysqli'); |
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} |
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} |
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iMattPro /
similartopics
