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<?php |
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namespace Mattbit\MysqlCompat; |
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use Mattbit\MysqlCompat\Exception\NoConnectionException; |
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use Mattbit\MysqlCompat\Exception\ClosedConnectionException; |
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class Manager |
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{ |
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/** |
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* The array of open connections. |
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* |
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* @var array |
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*/ |
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protected $connections = []; |
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/** |
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* @var ConnectionFactory |
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*/ |
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protected $connectionFactory; |
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/** |
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* Create a Manager instance. |
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* |
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* @param ConnectionFactory $connectionFactory |
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*/ |
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public function __construct(ConnectionFactory $connectionFactory) |
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{ |
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$this->connectionFactory = $connectionFactory; |
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} |
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/** |
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* Return a connection to the database, creating a new one if needed. |
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* |
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* @param string $dsn |
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* @param string $username |
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* @param string $password |
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* @return Connection |
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*/ |
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public function connect($dsn, $username = '', $password = '') |
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{ |
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$connectionId = "{$username}@{$dsn}"; |
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// If the same connection is present, do not open a new one |
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if ($connection = $this->getConnection($connectionId)) { |
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$this->setLastConnection($connectionId); |
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return $connection; |
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} |
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// Otherwise create a new connection |
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$connection = $this->connectionFactory->createConnection($dsn, $username, $password); |
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$this->addConnection($connectionId, $connection); |
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return $connection; |
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} |
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/** |
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* Close the connection. If no connection is passed, it closes the last. |
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* |
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* @param Connection|null $connection |
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* @return bool |
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* @throws NoConnectionException |
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*/ |
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public function disconnect(Connection $connection = null) |
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{ |
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if ($connection === null) { |
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$connection = $this->getLastConnection(); |
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} |
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$connection->close(); |
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$connectionId = array_search($connection, $this->connections); |
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unset($this->connections[$connectionId]); |
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return true; |
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} |
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/** |
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* Get a connection. |
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* |
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* @param string $id |
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* @return Connection |
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*/ |
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public function getConnection($id) |
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{ |
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if (array_key_exists($id, $this->connections)) { |
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return $this->connections[$id]; |
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} |
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} |
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/** |
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* Select the database to use. If the connection is omitted, the last one is used. |
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* |
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* @param $databaseName |
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* @param Connection|null $connection |
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* @return bool |
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*/ |
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public function useDatabase($databaseName, Connection $connection = null) |
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{ |
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$connection = $this->getOpenConnectionOrFail($connection); |
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$connection->useDatabase($databaseName); |
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return true; |
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} |
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/** |
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* Execute a query. If the connection is omitted, the last one is used. |
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* |
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* @param $query |
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* @param Connection|null $connection |
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* @return mixed |
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*/ |
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public function query($query, Connection $connection = null) |
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{ |
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$connection = $this->getOpenConnectionOrFail($connection); |
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return $connection->query($query); |
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} |
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/** |
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* Return the last used connection. |
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* |
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* @return Connection |
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* @throws NoConnectionException |
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*/ |
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public function getLastConnection() |
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{ |
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$connection = end($this->connections); |
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if (!$connection) { |
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throw new NoConnectionException("There is no open connection."); |
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} |
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return $connection; |
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} |
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public function getOpenConnectionOrFail(Connection $connection = null) |
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{ |
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if ($connection && $this->checkConnection($connection)) { |
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return $connection; |
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} |
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return $this->getLastConnection(); |
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} |
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public function checkConnection(Connection $connection) |
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{ |
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if ($connection->isOpen()) { |
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return true; |
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} |
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throw new ClosedConnectionException("Cannot use a closed connection."); |
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} |
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public function getConnections() |
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{ |
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return $this->connections; |
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} |
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public function setLastConnection($id) |
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{ |
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uksort($this->connections, function ($a, $b) use ($id) { |
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if ($a === $id) return 1; |
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if ($b === $id) return -1; |
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return 0; |
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}); |
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} |
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public function addConnection($id, Connection $connection) |
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{ |
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$this->connections[$id] = $connection; |
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} |
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} |
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mattbit /
mysql-compat
