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<?php |
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namespace Doctrine\DBAL\Id; |
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use Doctrine\DBAL\Connection; |
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use Doctrine\DBAL\DBALException; |
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use Doctrine\DBAL\DriverManager; |
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use Doctrine\DBAL\FetchMode; |
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use Doctrine\DBAL\LockMode; |
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use Throwable; |
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use const CASE_LOWER; |
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use function array_change_key_case; |
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/** |
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* Table ID Generator for those poor languages that are missing sequences. |
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* |
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* WARNING: The Table Id Generator clones a second independent database |
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* connection to work correctly. This means using the generator requests that |
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* generate IDs will have two open database connections. This is necessary to |
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* be safe from transaction failures in the main connection. Make sure to only |
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* ever use one TableGenerator otherwise you end up with many connections. |
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* |
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* TableID Generator does not work with SQLite. |
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* |
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* The TableGenerator does not take care of creating the SQL Table itself. You |
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* should look at the `TableGeneratorSchemaVisitor` to do this for you. |
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* Otherwise the schema for a table looks like: |
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* |
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* CREATE sequences ( |
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* sequence_name VARCHAR(255) NOT NULL, |
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* sequence_value INT NOT NULL DEFAULT 1, |
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* sequence_increment_by INT NOT NULL DEFAULT 1, |
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* PRIMARY KEY (sequence_name) |
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* ); |
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* |
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* Technically this generator works as follows: |
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* |
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* 1. Use a robust transaction serialization level. |
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* 2. Open transaction |
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* 3. Acquire a read lock on the table row (SELECT .. FOR UPDATE) |
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* 4. Increment current value by one and write back to database |
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* 5. Commit transaction |
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* |
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* If you are using a sequence_increment_by value that is larger than one the |
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* ID Generator will keep incrementing values until it hits the incrementation |
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* gap before issuing another query. |
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* |
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* If no row is present for a given sequence a new one will be created with the |
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* default values 'value' = 1 and 'increment_by' = 1 |
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*/ |
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class TableGenerator |
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{ |
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/** @var Connection */ |
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private $conn; |
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/** @var string */ |
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private $generatorTableName; |
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/** @var mixed[][] */ |
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private $sequences = []; |
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/** |
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* @param string $generatorTableName |
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* |
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* @throws DBALException |
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*/ |
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public function __construct(Connection $conn, $generatorTableName = 'sequences') |
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{ |
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$params = $conn->getParams(); |
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if ($params['driver'] === 'pdo_sqlite') { |
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throw new DBALException('Cannot use TableGenerator with SQLite.'); |
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} |
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$this->conn = DriverManager::getConnection($params, $conn->getConfiguration(), $conn->getEventManager()); |
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$this->generatorTableName = $generatorTableName; |
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} |
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/** |
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* Generates the next unused value for the given sequence name. |
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* |
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* @param string $sequenceName |
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* |
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* @return int |
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* |
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* @throws DBALException |
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*/ |
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public function nextValue($sequenceName) |
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{ |
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if (isset($this->sequences[$sequenceName])) { |
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$value = $this->sequences[$sequenceName]['value']; |
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$this->sequences[$sequenceName]['value']++; |
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if ($this->sequences[$sequenceName]['value'] >= $this->sequences[$sequenceName]['max']) { |
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unset($this->sequences[$sequenceName]); |
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} |
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return $value; |
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} |
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$this->conn->beginTransaction(); |
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try { |
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$platform = $this->conn->getDatabasePlatform(); |
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$sql = 'SELECT sequence_value, sequence_increment_by' |
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. ' FROM ' . $platform->appendLockHint($this->generatorTableName, LockMode::PESSIMISTIC_WRITE) |
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. ' WHERE sequence_name = ? ' . $platform->getWriteLockSQL(); |
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$stmt = $this->conn->executeQuery($sql, [$sequenceName]); |
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$row = $stmt->fetch(FetchMode::ASSOCIATIVE); |
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if ($row !== false) { |
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$row = array_change_key_case($row, CASE_LOWER); |
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$value = $row['sequence_value']; |
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$value++; |
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if ($row['sequence_increment_by'] > 1) { |
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$this->sequences[$sequenceName] = [ |
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'value' => $value, |
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'max' => $row['sequence_value'] + $row['sequence_increment_by'], |
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]; |
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} |
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$sql = 'UPDATE ' . $this->generatorTableName . ' ' . |
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'SET sequence_value = sequence_value + sequence_increment_by ' . |
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'WHERE sequence_name = ? AND sequence_value = ?'; |
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$rows = $this->conn->executeUpdate($sql, [$sequenceName, $row['sequence_value']]); |
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if ($rows !== 1) { |
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throw new DBALException('Race-condition detected while updating sequence. Aborting generation'); |
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} |
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} else { |
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$this->conn->insert( |
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$this->generatorTableName, |
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['sequence_name' => $sequenceName, 'sequence_value' => 1, 'sequence_increment_by' => 1] |
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); |
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$value = 1; |
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} |
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$this->conn->commit(); |
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} catch (Throwable $e) { |
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$this->conn->rollBack(); |
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throw new DBALException('Error occurred while generating ID with TableGenerator, aborted generation: ' . $e->getMessage(), 0, $e); |
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} |
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return $value; |
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} |
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} |
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doctrine /
dbal
