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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 PdoUniqueKeyExtractor |
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*/ |
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class PdoUniqueKeyExtractor extends UniqueKeyExtractorAbstract |
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{ |
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use PdoExtractorTrait { |
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fetchRecords as pdoFetchRecords; |
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} |
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/** |
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* Generic extraction from tables with unique (composite) key |
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* |
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* @param \PDO $pdo |
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* @param string|null $extractQuery |
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* @param array|string $uniqueKey can be either a unique key name as |
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* string |
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* `'(table.)compositeKeyName' // ('id' by default)` |
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* |
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* or an array : |
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* `['(table.)compositeKey1'] // single unique key` |
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* `['(table.)compositeKey1', '(table.)compositeKey2', ] // composite unique key` |
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* |
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* or an associative array in case you are using aliases : |
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* `[ |
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* '(table.)compositeKey1' => 'aliasNameAsInRecord', |
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* ]` |
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* |
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* and : |
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* `[ |
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* '(table.)compositeKey1' => 'aliasNameAsInRecord1', |
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* '(table.)compositeKey2' => 'aliasNameAsInRecord2', |
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* // ... |
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* ]` |
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* |
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* @throws YaEtlException |
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* @throws NodalFlowException |
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*/ |
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public function __construct(\PDO $pdo, ?string $extractQuery = null, $uniqueKey = 'id') |
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{ |
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$this->configurePdo($pdo); |
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parent::__construct($extractQuery, $uniqueKey); |
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} |
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/** |
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* Leave no trace |
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* implement here to allow easier overriding |
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*/ |
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public function __destruct() |
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{ |
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if ($this->driverBufferedQuery) { |
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// set driver state back to where we met |
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$this->pdo->setAttribute(\PDO::MYSQL_ATTR_USE_BUFFERED_QUERY, true); |
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} |
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} |
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/** |
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* Fetch records |
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* |
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* @return bool |
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*/ |
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public function fetchRecords(): bool |
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{ |
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if (!$this->pdoFetchRecords()) { |
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return false; |
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} |
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return true; |
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} |
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/** |
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* @return bool |
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*/ |
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protected function fetchJoinedRecords(): bool |
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{ |
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$extractQuery = $this->getPaginatedQuery(); |
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$statement = $this->pdo->prepare($extractQuery); |
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if (!$statement->execute(!empty($this->queryBindings) ? $this->queryBindings : null)) { |
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return false; |
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} |
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$this->joinedRecords = []; |
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while ($record = $statement->fetch(\PDO::FETCH_ASSOC)) { |
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$this->joinedRecords[$record[$this->uniqueKeyName]] = $record; |
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} |
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$statement->closeCursor(); |
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unset($statement); |
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// still set this as extracted as we build |
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// record map in both from and join context |
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$this->setExtracted($this->joinedRecords); |
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return !empty($this->joinedRecords); |
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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 $this->maxdefaultLimit |
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* |
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* @return string the paginated query with current offset and limit |
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*/ |
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protected function getPaginatedQuery(): string |
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{ |
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if ($this->joinFrom) { |
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$this->queryBindings = array_values($this->uniqueKeyValues); |
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$whereOrAndStr = stripos($this->extractQuery, 'WHERE') !== false ? 'AND' : 'WHERE'; |
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return $this->extractQuery . " $whereOrAndStr $this->uniqueKeyName IN (" . implode(',', array_fill(0, count($this->uniqueKeyValues), '?')) . ')'; |
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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
