public function setDisciplinas()
 {
     if (isset($this->Id) && isset($this->IdCurso)) {
         $dao = new DaoDisciplinaTurma();
         $this->Disciplinas = $dao->ObterDisciplinasTurmaCurso($this->IdCurso, $this->Id);
     }
 }
 public static function getInstance()
 {
     if (!isset(self::$instance)) {
         self::$instance = new DaoDisciplinaTurma();
     }
     return self::$instance;
 }