88 lines
1.9 KiB
PHP
88 lines
1.9 KiB
PHP
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<?php
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/**
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* NRE
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*
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* @author coderkun <olli@coderkun.de>
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* @copyright 2013 coderkun (http://www.coderkun.de)
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* @license http://www.gnu.org/licenses/gpl.html
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* @link http://www.coderkun.de/projects/nre
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*/
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namespace nre\drivers;
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/**
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* Abstract class for implementing a database driver.
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*
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* @author coderkun <olli@coderkun.de>
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*/
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abstract class DatabaseDriver extends \nre\core\Driver
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{
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/**
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* Driver class instance
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*
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* @static
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* @var DatabaseDriver
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*/
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protected static $driver = null;
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/**
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* Connection resource
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*
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* @var resource
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*/
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protected $connection = null;
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/**
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* Singleton-pattern.
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*
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* @param array $config Database driver configuration
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* @return DatabaseDriver Singleton-instance of database driver class
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*/
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public static function singleton($config)
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{
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// Singleton
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if(self::$driver !== null) {
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return self::$driver;
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}
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// Construct
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$className = get_called_class();
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self::$driver = new $className($config);
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return self::$driver;
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}
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/**
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* Construct a new database driver.
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*
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* @param array $config Connection and login settings
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*/
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protected function __construct($config)
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{
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parent::__construct();
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// Establish connection
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$this->connect($config);
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}
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/**
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* Establish a connect to a MqSQL-database.
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*
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* @throws \nre\exceptions\DatamodelException
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* @param array $config Connection and login settings
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*/
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protected abstract function connect($config);
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}
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?>
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