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<?php |
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/** |
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* User: jensk |
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* Date: 1-3-2017 |
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* Time: 13:21 |
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*/ |
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namespace CloudControl\Cms\search\indexer; |
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use CloudControl\Cms\search\Indexer; |
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/** |
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* Class TermFieldLengthNorm |
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* Formula = norm(d) = 1 / √numTerms |
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* |
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* @package CloudControl\Cms\search\indexer |
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*/ |
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class TermFieldLengthNorm |
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{ |
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/** |
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* @var \PDO |
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*/ |
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protected $dbHandle; |
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/** |
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* TermFieldLengthNorm constructor. |
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* |
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* @param \PDO $dbHandle |
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*/ |
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public function __construct($dbHandle) |
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{ |
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$this->dbHandle = $dbHandle; |
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} |
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public function execute() |
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{ |
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$db = $this->dbHandle; |
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$db->/** @scrutinizer ignore-call */ |
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sqliteCreateFunction('sqrt', 'sqrt', 1); |
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$stmt = $this->getStatement($db); |
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$uniqueFieldsPerDocument = $stmt->fetchAll(\PDO::FETCH_OBJ); |
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$values = array(); |
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$i = 0; |
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foreach ($uniqueFieldsPerDocument as $fieldRow) { |
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$values[] = 'UPDATE term_frequency SET termNorm = 1/sqrt(' . (int)$fieldRow->termCount . ') WHERE documentPath = ' . $db->quote($fieldRow->documentPath) . ' AND field = ' . $db->quote($fieldRow->field) . ';'; |
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$i += 1; |
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if ($i >= Indexer::SQLITE_MAX_COMPOUND_SELECT) { |
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$this->executeUpdateTermNorm($values, $db); |
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$values = array(); |
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$i = 0; |
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} |
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} |
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if (count($values) !== 0) { |
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$this->executeUpdateTermNorm($values, $db); |
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} |
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} |
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/** |
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* @param array $values |
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* @param \PDO $db |
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* @throws \Exception |
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*/ |
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private function executeUpdateTermNorm($values, $db) |
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{ |
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$sql = 'BEGIN TRANSACTION;' . PHP_EOL; |
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$sql .= implode(PHP_EOL, $values) . PHP_EOL; |
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$sql .= 'COMMIT;'; |
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if (($db->exec($sql)) === false) { |
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$errorInfo = $db->errorInfo(); |
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$errorMsg = $errorInfo[2]; |
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throw new \RuntimeException('SQLite Exception: ' . $errorMsg . ' in SQL: <br /><pre>' . $sql . '</pre>'); |
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} |
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} |
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/** |
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* @param \PDO $db |
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* @return \PDOStatement |
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* @throws \Exception |
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*/ |
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protected function getStatement($db) |
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{ |
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$sql = ' |
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SELECT documentPath, field, COUNT(`count`) AS termCount |
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FROM term_count |
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GROUP BY documentPath, field |
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'; |
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$stmt = $db->prepare($sql); |
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if ($stmt === false) { |
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$errorInfo = $db->errorInfo(); |
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$errorMsg = $errorInfo[2]; |
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throw new \RuntimeException('SQLite Exception: ' . $errorMsg . ' in SQL: <br /><pre>' . $sql . '</pre>'); |
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} |
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if (($stmt->execute()) === false) { |
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$errorInfo = $db->errorInfo(); |
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$errorMsg = $errorInfo[2]; |
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throw new \RuntimeException('SQLite Exception: ' . $errorMsg . ' in SQL: <br /><pre>' . $sql . '</pre>'); |
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} |
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return $stmt; |
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} |
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} |
jenskooij /
cloudcontrol
