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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) 2014 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\core; |
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class fulltext_support |
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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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* @access public |
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* @param \phpbb\db\driver\driver_interface |
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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 = $db; |
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} |
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/** |
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* Check if the database is using MySQL |
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* |
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* @access public |
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* @return bool True if is mysql, false otherwise |
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*/ |
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public function is_mysql() |
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{ |
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return ($this->db->get_sql_layer() === 'mysql4' || $this->db->get_sql_layer() === 'mysqli'); |
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} |
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/** |
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* Check if the database is using PostgreSQL |
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* |
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* @access public |
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* @return bool True if is postgresql, false otherwise |
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*/ |
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public function is_postgres() |
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{ |
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return ($this->db->get_sql_layer() === 'postgres'); |
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} |
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/** |
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* Check for FULLTEXT index support |
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* |
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* @access public |
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* @return bool True if FULLTEXT is supported, false otherwise |
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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_postgres() || $this->get_engine() === 'myisam' || ($this->get_engine() === 'innodb' && phpbb_version_compare($this->db->sql_server_info(true), '5.6.4', '>='))); |
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} |
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/** |
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* Get the database storage engine name |
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* |
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* @access public |
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* @return string The storage engine name |
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*/ |
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public function get_engine() |
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{ |
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return isset($this->engine) ? $this->engine : $this->set_engine(); |
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} |
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/** |
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* Set the database storage engine name |
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* |
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* @access public |
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* @return string The storage engine name |
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*/ |
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public function set_engine() |
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{ |
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$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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* Check if a field is a FULLTEXT index |
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* |
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* @access public |
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* @param string $field name of a field |
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* @return bool True if field is a FULLTEXT index, false otherwise |
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*/ |
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public function is_index($field = 'topic_title') |
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{ |
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$is_index = false; |
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if ($this->is_mysql()) |
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{ |
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$sql = 'SHOW INDEX |
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FROM ' . TOPICS_TABLE; |
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$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'] === $field) |
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{ |
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$is_index = true; |
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break; |
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} |
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} |
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$this->db->sql_freeresult($result); |
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} |
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else if ($this->is_postgres()) |
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{ |
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global $config; |
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$ts_name = $config['similar_topics_postgres_ts_name']; |
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foreach ($this->get_pg_indexes($field) AS $index) |
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{ |
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if ($index == TOPICS_TABLE . '_' . $ts_name . '_' .$field) |
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{ |
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$is_index = true; |
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break; |
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} |
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} |
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} |
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return $is_index; |
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} |
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/** |
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* Get topics table information |
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* |
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* @access protected |
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* @return mixed Array with the table info, false if the table does not exist |
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*/ |
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protected function get_table_info() |
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{ |
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$result = $this->db->sql_query('SHOW TABLE STATUS LIKE \'' . TOPICS_TABLE . '\''); |
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$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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* get all PostgreSQL FULLTEXT indexes on field in topics table |
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* |
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* @access public |
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* @param string $field name of a field |
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* @return array contains index names |
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*/ |
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public function get_pg_indexes($field = 'topic_title') |
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{ |
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$indexes = array(); |
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if (!$this->is_postgres()) |
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{ |
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return $indexes; |
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} |
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$sql = "SELECT c2.relname |
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FROM pg_catalog.pg_class c1, pg_catalog.pg_index i, pg_catalog.pg_class c2, pg_catalog.pg_get_indexdef(i.indexrelid, 0, true) indexdef |
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WHERE c1.relname = '" . TOPICS_TABLE . "' |
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AND position('to_tsvector' in indexdef) > 0 |
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AND pg_catalog.pg_table_is_visible(c1.oid) |
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AND c1.oid = i.indrelid |
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AND i.indexrelid = c2.oid;"; |
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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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if (strpos($row['relname'], $field) !== false) |
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{ |
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$indexes[] = $row['relname']; |
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} |
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} |
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$this->db->sql_freeresult($result); |
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return $indexes; |
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} |
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} |
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iMattPro /
similartopics
