laravel連接多個不同數據庫的單例類

class singletonInstance 
{

    protected static $instances = [];
    protected static $table = null;
    protected static $connection = null;

    public function __construct()
    {
        if(!isset(static::$instances[static::class])){
            if(is_null(self::$table) || is_null(self::$connection))
            {
                throw new \Exception('not defined property');
            }
            static::$instances[static::class] = DB::connection(self::connection)->table(self::$table);
        }
    }

    public static function getDB()
    {
        return static::$instances[static::class];
    }

}

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