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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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/** |
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* trait PdoExtractorTrait |
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*/ |
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trait PdoExtractorTrait |
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{ |
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/** |
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* This is hte default limit applied when no limit |
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* is set and an offset is set. |
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* It's 2^31 – 1 = 2147483647 = max 32bit |
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* Use 2^63 − 1 = 9223372036854775807 = max 64bit |
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* if your os and dbms are 64bit |
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* |
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* @var int |
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*/ |
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protected $maxdefaultLimit = 2147483647; |
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/** |
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* @var \PDO |
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*/ |
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protected $pdo; |
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/** |
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* @var bool |
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*/ |
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protected $driverBufferedQuery; |
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/** |
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* @var array |
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*/ |
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protected $supportedDrivers = [ |
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'mysql' => 'mysql', |
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'sqlite' => 'sqlite', |
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'pgsql' => 'pgsql', |
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]; |
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/** |
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* @var string |
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*/ |
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protected $dbDriverName; |
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/** |
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* @var array |
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*/ |
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protected $queryBindings; |
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/** |
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* leave no trace |
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*/ |
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public function __destruct() |
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{ |
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if ($this->dbDriverName === 'mysql' && $this->driverBufferedQuery) { |
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// set driver state back to where we met |
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$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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* @param \PDO $pdo |
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*/ |
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public function configurePdo(\PDO $pdo) |
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{ |
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$this->pdo = $pdo; |
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$this->dbDriverName = $this->pdo->getAttribute(\PDO::ATTR_DRIVER_NAME); |
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if (!isset($this->supportedDrivers[$this->dbDriverName])) { |
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throw new \Exception('[YaEtl] Pdo driver not supported, must be one of: ' . \implode(', ', \array_keys($this->supportedDrivers))); |
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} |
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if ($this->dbDriverName === 'mysql') { |
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// buffered wueries can have great performance impact |
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// with large data sets |
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$this->driverBufferedQuery = $this->pdo->getAttribute(\PDO::MYSQL_ATTR_USE_BUFFERED_QUERY); |
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if ($this->driverBufferedQuery) { |
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// disable buffered queries as we should be querying by a lot |
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$this->pdo->setAttribute(\PDO::MYSQL_ATTR_USE_BUFFERED_QUERY, false); |
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} |
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} |
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} |
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/** |
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* @param string $extractQuery which MUST NOT contain the LIMIT/OFFSET bit |
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* |
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* @return $this |
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*/ |
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public function setExtractQuery($extractQuery) |
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{ |
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if (empty($this->pdo)) { |
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throw new \Exception('[YaEtl] Pdo must be set'); |
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} |
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parent::setExtractQuery($extractQuery); |
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return $this; |
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} |
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/** |
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* @return string |
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*/ |
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protected function getLimitOffsetBit() |
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{ |
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return ' ' . \implode('', [ |
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$this->limit ? ' LIMIT ' . (int) $this->limit : ($this->offset ? ' LIMIT ' . $this->maxdefaultLimit : ''), |
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$this->offset ? ' OFFSET ' . (int) $this->offset : '', |
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';', |
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]); |
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} |
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} |
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fab2s /
YaEtl
