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<?php namespace Illuminate\Database\Connectors;

class MySqlConnector extends Connector implements ConnectorInterface {

/**
	 * Establish a database connection.
	 *
	 * @param  array  $config
	 * @return \PDO
	 */
	public function connect(array $config)
	{
		$dsn = $this->getDsn($config);

$options = $this->getOptions($config);

// We need to grab the PDO options that should be used while making the brand
		// new connection instance. The PDO options control various aspects of the
		// connection's behavior, and some might be specified by the developers.
		$connection = $this->createConnection($dsn, $config, $options);

if (isset($config['unix_socket']))
		{
			$connection->exec("use {$config['database']};");
		}

$collation = $config['collation'];

// Next we will set the "names" and "collation" on the clients connections so
		// a correct character set will be used by this client. The collation also
		// is set on the server but needs to be set here on this client objects.
		$charset = $config['charset'];

$names = "set names '$charset'".
			( ! is_null($collation) ? " collate '$collation'" : '');

$connection->prepare($names)->execute();

// If the "strict" option has been configured for the connection we'll enable
		// strict mode on all of these tables. This enforces some extra rules when
		// using the MySQL database system and is a quicker way to enforce them.
		if (isset($config['strict']) && $config['strict'])
		{
			$connection->prepare("set session sql_mode='STRICT_ALL_TABLES'")->execute();
		}

return $connection;
	}

/**
	 * Create a DSN string from a configuration. Chooses socket or host/port based on
	 * the 'unix_socket' config value
	 *
	 * @param  array   $config
	 * @return string
	 */
	protected function getDsn(array $config)
	{
		return $this->configHasSocket($config) ? $this->getSocketDsn($config) : $this->getHostDsn($config);
	}

/**
	 * Determine if the given configuration array has a UNIX socket value.
	 *
	 * @param  array  $config
	 * @return bool
	 */
	protected function configHasSocket(array $config)
	{
		return isset($config['unix_socket']) && ! empty($config['unix_socket']);
	}

/**
	 * Get the DSN string for a socket configuration.
	 *
	 * @param  array  $config
	 * @return string
	 */
	protected function getSocketDsn(array $config)
	{
		extract($config);

return "mysql:unix_socket={$config['unix_socket']};dbname={$database}";
	}

/**
	 * Get the DSN string for a host / port configuration.
	 *
	 * @param  array  $config
	 * @return string
	 */
	protected function getHostDsn(array $config)
	{
		extract($config);

return isset($config['port'])
                        ? "mysql:host={$host};port={$port};dbname={$database}"
                        : "mysql:host={$host};dbname={$database}";
	}

}

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