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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 PostgreSQL dbms |
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*/ |
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class postgres 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 \phpbb\config\config */ |
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protected $config; |
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/** @var string */ |
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protected $ts_name; |
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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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* @param \phpbb\config\config $config |
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*/ |
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public function __construct(\phpbb\db\driver\driver_interface $db, \phpbb\config\config $config) |
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{ |
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$this->db = $db; |
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$this->config = $config; |
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$this->set_ts_name($config['pst_postgres_ts_name']); |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function get_name() |
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{ |
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return 'postgres'; |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function get_type() |
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{ |
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return 'postgres'; |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function get_query($topic_id, $topic_title, $length, $sensitivity) |
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{ |
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$ts_name = $this->db->sql_escape($this->ts_name); |
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$ts_query_text = $this->db->sql_escape(preg_replace('/\s+/', '|', $topic_title)); |
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$ts_rank_cd = "ts_rank_cd('{1,1,1,1}', to_tsvector('$ts_name', t.topic_title), to_tsquery('$ts_name', '$ts_query_text'), 32)"; |
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return array( |
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'SELECT' => "f.forum_id, f.forum_name, t.*, $ts_rank_cd AS score", |
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'FROM' => array( |
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TOPICS_TABLE => 't', |
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), |
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'LEFT_JOIN' => array( |
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array( |
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'FROM' => array(FORUMS_TABLE => 'f'), |
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'ON' => 'f.forum_id = t.forum_id', |
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), |
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), |
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'WHERE' => "to_tsquery('$ts_name', '$ts_query_text') @@ to_tsvector('$ts_name', t.topic_title) AND $ts_rank_cd >= " . (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 > (extract(epoch from current_timestamp)::integer - ' . (int) $length . ') |
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AND t.topic_id <> ' . (int) $topic_id, |
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'ORDER_BY' => 'score DESC, t.topic_time DESC', |
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); |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function is_supported() |
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{ |
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return ($this->db->get_sql_layer() === 'postgres'); |
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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 === $table . '_' . $this->ts_name . '_' . $column) |
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{ |
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return true; |
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} |
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} |
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return false; |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function get_fulltext_indexes($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 = "SELECT c2.relname |
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FROM pg_catalog.pg_class c1, pg_catalog.pg_index i, pg_catalog.pg_class c2 |
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WHERE c1.relname = '" . $this->db->sql_escape($table) . "' |
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AND position('to_tsvector' in pg_catalog.pg_get_indexdef(i.indexrelid, 0, true)) > 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'], $column) !== false) |
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{ |
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$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 $indexes; |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function create_fulltext_index($column = 'topic_title', $table = TOPICS_TABLE) |
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{ |
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// Make sure ts_name is current |
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$this->set_ts_name($this->config['pst_postgres_ts_name']); |
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$new_index = $table . '_' . $this->ts_name . '_' . $column; |
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$indexed = false; |
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foreach ($this->get_fulltext_indexes($column, $table) as $index) |
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{ |
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if ($index === $new_index) |
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{ |
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$indexed = true; |
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} |
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else |
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{ |
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$sql = 'DROP INDEX ' . $index; |
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$this->db->sql_query($sql); |
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} |
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} |
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if (!$indexed) |
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{ |
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$sql = 'CREATE INDEX ' . $this->db->sql_escape($new_index) . ' |
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ON ' . $this->db->sql_escape($table) . " |
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USING gin (to_tsvector ('" . $this->db->sql_escape($this->ts_name) . "', " . $this->db->sql_escape($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 ''; |
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} |
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/** |
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* Set the PostgreSQL Text Search name (dictionary) |
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* |
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* @param string $ts_name Dictionary name |
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*/ |
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protected function set_ts_name($ts_name) |
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{ |
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$this->ts_name = $ts_name ?: 'simple'; |
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} |
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} |
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iMattPro /
similartopics
