public ResultSet executarSql(String sql) {
        Connection conn = this.getConn();
        ResultSet rs = null;
        try {
            Statement stm = conn.createStatement();
            rs = stm.executeQuery(sql);
        } catch (SQLException ex) {
            Logger.getLogger(ConectorMySql.class.getName()).log(Level.SEVERE, null, ex);
        }
        return rs;
    }