为什么在对某行执行操作时其他行会受到影响？

Question

向某行提交操作时，其他行受到影响，或者最后插入的行正在执行该操作，而不是所选行。
截图：https://imgur.com/gallery/rnVJjhP

public static function update_booking_status($room_no){
        Global $pdo;
        $sql="update rooms set booking='Success' where room_no=:room_no";
        $rslt=$pdo->prepare($sql);
        $rslt->bindParam(':room_no',$room_no,PDO::PARAM_STR);
        $rslt->execute();
    }
    public static function cancel_booking_status($room_no){
        Global $pdo;
        $sql="UPDATE rooms SET booking='No' WHERE room_no=:room_no";
        $rslt=$pdo->prepare($sql);
        $rslt->bindParam(':room_no',$room_no,PDO::PARAM_STR);
        $rslt->execute();
    }
    public static function pending_booking_status($room_no){
        Global $pdo;
        $sql="UPDATE rooms SET booking='Pending' WHERE room_no=:room_no";
        $rslt=$pdo->prepare($sql);
        $rslt->bindParam(':room_no',$room_no,PDO::PARAM_STR);
        $rslt->execute();
    }
    public static function delete_from_booking_status($room_no){
        //echo $room_no;
        Global $pdo;
        $sql="DELETE from booking WHERE room_no=:room_no";
        $rslt=$pdo->prepare($sql);
        $rslt->bindParam(':room_no',$room_no,PDO::PARAM_STR);
        $rslt->execute();
    }

    public static function getid($number){
        return $number;
    }
    public static function date_compare_booking_update(){
        Global $pdo;

        $sql="UPDATE rooms,booking SET rooms.booking='No' where booking.tdate < CURDATE() and booking.room_no=rooms.room_no"; //Update booking status
        $st=$pdo->prepare($sql);
        $st->execute();

        $qry="SELECT rooms.room_no from rooms,booking where booking.tdate < CURDATE() and booking.room_no=rooms.room_no";//Catch the room_no
        $stmt = $pdo->prepare($qry);
        $stmt->execute();
        while($obj = $stmt->fetchObject()){
            $room_no = $obj->room_no;
            operations::delete_from_booking_status($room_no);
        }
    }
    public static function show_booking(){
        Global $pdo;
        Global $pending_booking_statuso;
        operations::date_compare_booking_update();
        $qry="SELECT rooms.price, booking.room_no,booking.fdate,booking.tdate,booking.name,booking.phone,booking.code,booking.address,rooms.booking,rooms.assigned_to from booking left join rooms ON booking.room_no=rooms.room_no";
        //$qry = "SELECT * FROM booking ";
        $stmt = $pdo->prepare($qry);
        $stmt->execute();
        while($obj = $stmt->fetchObject()){
            $price=$obj->price;
            $fdate = $obj->fdate;
            $tdate = $obj->tdate;
            $name = $obj->name;
            $phone=$obj->phone;
            $code = $obj->code;
            $address = $obj->address;
            $room_no = $obj->room_no;
            $booking = $obj->booking;
            $assigned_to=$obj->assigned_to;

            echo "

            <tr>
                <td>$room_no</td>
                <td>$fdate</td>
                <td>$tdate</td>
                <td>$name</td>
                <td>$phone</td>
                <td>$code</td>
                <td>$address</td>
                <td>$booking</td>
                <td>$assigned_to</td>
                <td>
                    <form action='booking.php' method='post'>
                        <select name='todo'>
                            <option value=''>----------</option>
                            <option value='pending'>Pending</option>
                            <option value='cancelled'>Cancelled</option>
                            <option value='success'>Success</option>
                        </select>
                        <span><input type='submit' name='submit' value='Submit' class='btn btn-primary'></span>
                    </form>
                </td>
            </tr>
            ";

        if(isset($_POST['submit'])){
            if($_POST['todo']=='pending'){
                echo'pending';
                echo $room_no;
                operations::pending_booking_status($room_no);
                //header("Location:booking.php");
            }
            else if($_POST['todo']=='cancelled'){
                echo'cancelled';
                echo $room_no;
                operations::cancel_booking_status($room_no);
                operations::delete_from_booking_status($room_no);
                //header("Location:booking.php");
            }
            else if($_POST['todo']=='success'){
                echo 'Success';
                echo $room_no;
                operations::update_booking_status($room_no);
                operations::insert_room_booking_history($room_no,$fdate,$tdate,$name,$phone,$code,$address,$price);
                //header("Location:booking.php");
            }
            else{
                echo 'Nothing Selected Try Again';
            }
        }
    }
}

如何解决？如何捕获选定的行以执行操作？请查看本文所附的屏幕截图，以更好地理解。我已经显示了数据库表和操作页，其中表行将要执行操作。