univ-pau-ics/build/database/core/DatabaseDriver.php

<?php

	namespace database\core;
	use \error\core\Error;
	use \error\core\Err;


	class DatabaseDriver{

		/* STATIC ATTRIBUTES */
		private static function conf(){
			// YOUR CONFIGURATION BEHIND
			$path = __CONFIG__.'/database-driver.json';

			/* (1) Checks the file */
			if( !is_file($path) )
				return [];

			/* (2) Checks json */
			$parsed = json_decode( file_get_contents($path), true );

			if( !is_array($parsed) )
				return [];

			/* (3) Returns configuration */
			return $parsed;
		}


		private static $path;          // Databases configurations files
		private static $config;        // PDO configurations
		private static $instance = []; // Database driver instance list

		public $error;

		/* ATTRIBUTES */
		private $host;
		private $dbname;
		private $username;
		private $password;
		private $pdo;



		/* CONSTRUCTOR OF A DATABASE DRIVER
		*
		* @host<String> 										Database Server's host
		* @dbname<String> 										Database name
		* @username<String> 									Database username
		* @password<String> 									Database password
		*
		*/
		private function __construct($host, $dbname, $username, $password){
			/* (2) Stores configuration */
			$this->host     = $host;
			$this->dbname   = $dbname;
			$this->username = $username;
			$this->password = $password;

			try{

				$this->pdo = new \PDO('mysql:host='.$this->host.';dbname='.$this->dbname, $this->username, $this->password);
				$this->pdo->setAttribute(\PDO::ATTR_DEFAULT_FETCH_MODE, \PDO::FETCH_ASSOC);

				// On signale que tout s'est bien passe
				$this->error = new Error(Err::Success);

			}catch(Exception $e){
				// On signale qu'il y a une erreur
				$this->error = new Error(Err::PDOConnection);
			}
		}



		/************************************************
		****       Multiton Management (static)      ****
		************************************************/

		/* ADDS A NEW CONNECTION
		*
		* @label<String> 										[optional] Database Label
		*
		* @return status<Boolean>								If added successfully
		*
		*/
		private static function add($label=null){
			$conf = self::conf();

			/* [1] Default values
			=========================================================*/
			/* (1) If label isn't given */
			is_null($label) && ($label = 'default');

			/* (2) If label and no path */
			if( $label !== 'default' && !isset($conf[$label]) )
				return false;


			/* [3] Instanciates the driver
			=========================================================*/
			try{

				/* (1) If local -> instanciates with local configuration */
				if( !checkdnsrr($_SERVER['SERVER_NAME'], 'NS') )
					self::$instance[$label] = new DatabaseDriver($conf[$label]['local']['host'], $conf[$label]['local']['dbname'], $conf[$label]['local']['user'], $conf[$label]['local']['password']);
				/* (2) If Remote -> instanciates with Remote configuration */
				else
					self::$instance[$label] = new DatabaseDriver($conf[$label]['remote']['host'], $conf[$label]['remote']['dbname'], $conf[$label]['remote']['user'], $conf[$label]['remote']['password']);

				return true;

			}catch(\Exception $e){

				/* (3) If fails */
				return false;

			}

		}


		/* GET A DATABASE DRIVER INSTANCE
		*
		* @label<String> 										[optional] Driver's label
		*
		* @return driver<Database> 								Multiton
		*
		*/
		public static function get($label=null){
			$conf = self::conf();

			/* [1] Checks arguments
			=========================================================*/
			/* (1) Label default value */
			is_null($label) && ($label = 'default');

			/* (2) If no label, or unknown label */
			if( is_null($label) || !isset(self::$instance[$label]) ){

				/* (2.1) Try to add the configuration if exists */
				if( isset($conf[$label]) ){
					self::add($label);
					return self::get($label);
				}


				throw new \Exception('Database @label is incorrect.');
			}


			/* [2] Returns instance
			=========================================================*/
			return self::$instance[$label];
		}


		/** retourne la connection statique
		 * @param null $label
		 * @return \PDO
		 */
		public static function getPDO($label=null){
			$instance = self::get($label);

			return $instance->pdo;
		}


		public function getConfig(){
			return [
				'host' => $this->host,
				'dbname' => $this->dbname,
				'username' => $this->username
			];
		}



	}
?>