public function salvar(MalaDireta $obj)
 {
     $strSQL = "INSERT INTO CAD_MAD_MALAS_DIRETAS (";
     $strSQL .= "MAD_Assunto, ";
     $strSQL .= "MAD_DataHoraCadastro, ";
     $strSQL .= "MAD_Conteudo, ";
     $strSQL .= "USU_Cadastro_ID ";
     $strSQL .= ")VALUES(";
     $strSQL .= "'" . $obj->getAssunto() . "', ";
     $strSQL .= "'" . $obj->getDataHoraCadastro() . "', ";
     $strSQL .= "'" . $obj->getConteudo() . "', ";
     $strSQL .= " " . $obj->getUsuarioCadastro()->getId() . " ";
     $strSQL .= ")";
     return Db::getInstance()->executar($strSQL);
 }