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<?php |
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namespace Childish\connection; |
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use Childish\support\Tools; |
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use PDO; |
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/** |
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* Connector |
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* |
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* @author Pu ShaoWei <[email protected]> |
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* @date 2017/12/7 |
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* @package Childish\connection |
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* @version 1.0 |
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*/ |
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class Connector |
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{ |
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/** |
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* The default PDO connection options. |
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* |
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* @var array |
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*/ |
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protected $options = [ |
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PDO::ATTR_CASE => PDO::CASE_NATURAL, |
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PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION, |
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PDO::ATTR_ORACLE_NULLS => PDO::NULL_NATURAL, |
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PDO::ATTR_STRINGIFY_FETCHES => false, |
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PDO::ATTR_EMULATE_PREPARES => false, |
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]; |
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/** |
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* Create a new PDO connection. |
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* |
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* @param string $dsn |
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* @param array $config |
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* @param array $options |
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* @return \PDO |
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*/ |
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public function createConnection($dsn, array $config, array $options) |
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{ |
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list($username, $password) = [ |
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$config['username'] ?? null, $config['password'] ?? null, |
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]; |
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try { |
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return $this->createPdoConnection( |
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$dsn, $username, $password, $options |
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); |
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} catch (\Exception $e) { |
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return $this->tryAgainIfCausedByLostConnection( |
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$e, $dsn, $username, $password, $options |
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); |
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} |
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} |
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/** |
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* Create a new PDO connection instance. |
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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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* @param array $options |
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* @return \PDO |
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*/ |
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protected function createPdoConnection($dsn, $username, $password, $options) |
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{ |
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return new PDO($dsn, $username, $password, $options); |
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} |
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/** |
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* Determine if the connection is persistent. |
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* |
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* @param array $options |
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* @return bool |
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*/ |
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protected function isPersistentConnection($options) |
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{ |
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return isset($options[PDO::ATTR_PERSISTENT]) && |
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$options[PDO::ATTR_PERSISTENT]; |
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} |
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/** |
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* Handle an exception that occurred during connect execution. |
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* |
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* @param \Exception $e |
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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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* @param array $options |
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* @return \PDO |
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* |
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* @throws \Exception |
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*/ |
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protected function tryAgainIfCausedByLostConnection(\Exception $e, $dsn, $username, $password, $options) |
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{ |
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if ($this->causedByLostConnection($e)) { |
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return $this->createPdoConnection($dsn, $username, $password, $options); |
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} |
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throw $e; |
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} |
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/** |
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* Get the PDO options based on the configuration. |
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* |
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* @param array $config |
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* @return array |
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*/ |
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public function getOptions(array $config) |
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{ |
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$options = $config['options'] ?? []; |
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return array_diff_key($this->options, $options) + $options; |
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} |
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/** |
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* Get the default PDO connection options. |
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* |
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* @return array |
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*/ |
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public function getDefaultOptions() |
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{ |
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return $this->options; |
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} |
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/** |
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* Set the default PDO connection options. |
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* |
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* @param array $options |
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* @return void |
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*/ |
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public function setDefaultOptions(array $options) |
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{ |
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$this->options = $options; |
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} |
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/** |
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* Determine if the given exception was caused by a lost connection. |
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* |
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* @param \Exception $e |
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* @return bool |
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*/ |
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protected function causedByLostConnection(\Exception $e) |
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{ |
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$message = $e->getMessage(); |
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return Tools::contains($message, [ |
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'server has gone away', |
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'no connection to the server', |
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'Lost connection', |
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'is dead or not enabled', |
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'Error while sending', |
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'decryption failed or bad record mac', |
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'server closed the connection unexpectedly', |
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'SSL connection has been closed unexpectedly', |
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'Error writing data to the connection', |
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'Resource deadlock avoided', |
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'Transaction() on null', |
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'child connection forced to terminate due to client_idle_limit', |
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]); |
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} |
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} |
PuShaoWei /
SimpleEloquent
