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<?php |
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/* |
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* This file is part of YaEtl. |
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* (c) Fabrice de Stefanis / https://github.com/fab2s/YaEtl |
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* This source file is licensed under the MIT license which you will |
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* find in the LICENSE file or at https://opensource.org/licenses/MIT |
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*/ |
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namespace fab2s\YaEtl\Extractors; |
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use fab2s\NodalFlow\NodalFlowException; |
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use fab2s\NodalFlow\YaEtlException; |
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/** |
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* Class PdoExtractor |
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*/ |
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class PdoExtractor extends DbExtractorAbstract |
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{ |
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use PdoExtractorTrait; |
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/** |
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* Instantiate PdoExtractor |
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* |
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* @param \PDO $pdo |
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* @param string|null $extractQuery |
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* |
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* @throws NodalFlowException |
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* @throws YaEtlException |
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*/ |
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public function __construct(\PDO $pdo, $extractQuery = null) |
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{ |
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$this->configurePdo($pdo); |
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parent::__construct($extractQuery); |
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} |
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/** |
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* Leave no trace |
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* implement here to allow easier overriding |
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*/ |
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public function __destruct() |
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{ |
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if ($this->driverBufferedQuery) { |
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// set driver state back to where we met |
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$this->pdo->setAttribute(\PDO::MYSQL_ATTR_USE_BUFFERED_QUERY, true); |
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} |
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} |
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/** |
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* Fetch records |
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* |
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* @return bool |
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*/ |
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public function fetchRecords() |
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{ |
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$extractQuery = $this->getPaginatedQuery(); |
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$query = $this->pdo->prepare($extractQuery); |
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if (!$query->execute(!empty($this->queryBindings) ? $this->queryBindings : null)) { |
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return false; |
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} |
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$this->extracted = new \SplDoublyLinkedList; |
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$hasRecord = false; |
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while ($record = $query->fetch(\PDO::FETCH_ASSOC)) { |
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$this->extracted->push($record); |
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$hasRecord = true; |
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} |
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$query->closeCursor(); |
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unset($query); |
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$this->extracted->rewind(); |
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return $hasRecord; |
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} |
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/** |
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* This method sets offset and limit in the query |
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* WARNING : if you set an offset without limit, |
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* the limit will be set to $this->maxdefaultLimit |
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* |
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* @return string the paginated query with current offset and limit |
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*/ |
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protected function getPaginatedQuery() |
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{ |
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return $this->extractQuery . $this->getLimitOffsetBit(); |
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} |
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} |
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fab2s /
YaEtl
