<?php
namespace Illuminate\Database\Connectors;
use PDO;
use Exception;
use Illuminate\Support\Arr;
use Illuminate\Database\DetectsLostConnections;
// that was system class
class Connector
{// a connector
use DetectsLostConnections;// a trait like detects lost connections
/**
* The default PDO connection options.
*
* @var array
*/
protected $options = [
PDO::ATTR_CASE => PDO::CASE_NATURAL,
PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION,
PDO::ATTR_ORACLE_NULLS => PDO::NULL_NATURAL,
PDO::ATTR_STRINGIFY_FETCHES => false,
PDO::ATTR_EMULATE_PREPARES => false,
];// set all this pdo options
/**
* Get the PDO options based on the configuration.
*
* @param array $config
* @return array
*/
public function getOptions(array $config)
{
$options = Arr::get($config, 'options', []);// get configs options default is empty array
return array_diff_key($this->options, $options) + $options;// set the new option
}// get options
/**
* Create a new PDO connection.
*
* @param string $dsn
* @param array $config
* @param array $options
* @return \PDO
*/
public function createConnection($dsn, array $config, array $options)
{// create a new pdo connection.
$username = Arr::get($config, 'username');//username
$password = Arr::get($config, 'password');// password
try {
$pdo = new PDO($dsn, $username, $password, $options);
} catch (Exception $e) {// try connection this function
$pdo = $this->tryAgainIfCausedByLostConnection(
$e, $dsn, $username, $password, $options// throw exception
);
}
return $pdo;// if ok,just return this pdo function
}
/**
* Get the default PDO connection options.
*
* @return array
*/
public function getDefaultOptions()
{
return $this->options;
}// get the default Options by this class
/**
* Set the default PDO connection options.
*
* @param array $options
* @return void
*/
public function setDefaultOptions(array $options)
{
$this->options = $options;
}// can set the default options in this way
/**
* Handle a exception that occurred during connect execution.
*
* @param \Exception $e
* @param string $dsn
* @param string $username
* @param string $password
* @param array $options
* @return \PDO
*
* @throws \Exception
*/
protected function tryAgainIfCausedByLostConnection(Exception $e, $dsn, $username, $password, $options)
{//Handle a exception that occurred during connect execution
if ($this->causedByLostConnection($e)) {
return new PDO($dsn, $username, $password, $options);
}
throw $e;
}// throw $e
}