获取使用php / mysql预订的日期

Question

I have a table in mysql that holds a start and end date. These start and end date are for when a hotel is booked. What I need to do is show a calendar that shows the dates that are booked and the dates that are available for the current month. How would I find out what days are booked for the current month? I could loop through each day of the current month but that would mean 30 or 31 queries, is there a better, more optimized way to find out what days are booked for the month so I can color code the days on a calendar?

The table structure is this:

hotelid int(11)

startdate (date)

enddate (date)

Query Request:

SELECT * FROM hotel_book WHERE hotelid = 1 AND DATE_FORMAT(startdate,'%Y-%m') >= '2012-08' AND DATE_FORMAT(enddate,'%Y-%m') <= '2012-08'

Im sure I could just pass it 2012-08-01 and 2012-08-31 so Im not processing the date format on each check. But just for example purposes.

Answer 1

Another approach to this would be to allow your calendar to accept start and end dates and render each day that is booked within the calendar logic. If the calendar uses javascript rather than PHP or MySQL impact on your server(s) would be minimal. Either way you end up looping, it just depends on where you want that to happen.

Answer 2

So first get the hotel id. Then do a query to get all start and end dates respective to that hotel id. I suggest you have a second field where you calculate the difference:

If someone has booked 1st to the 3rd then the 2nd is booked as well, so you would have to make a function that calculates the difference then outputs the 'in between' fields. So it would have to first get the start number then add +1 days every time until the end date. So it would end up like array(1,2,3)

Then you can take this information and put it into a booked array for a jquery or ajax calendar (plenty available online). Presumably once a date is booked it cannot be booked again or else you would have duplicate values of 1,2,3 - so I'm guessing the hotel only has one room avail or something.

Answer 3

Here is the code to get the dates you want. You'll be able to show them on your calendar regarding to it's logic. Note that i used custom class for database select.

$id=$_POST['id'];
$days=$db->select("reservations","room_id=".$id);
$listofdays=array();
foreach ($days $day) {
$start=$day['start'];
$end=$day['end'];
$liste=array(); //This array will be filled with dates between start and end
$liste=date_range($start, $end, $step = '+1 day', $output_format = 'm-d-Y'     );
foreach ($liste as $key => $list) {
$listofdays[] = $list;

}
}

//date_range function below:

    function date_range($first, $last, $step = '+1 day', $output_format = 'm/d/Y' ) {

$dates = array();
$current = strtotime($first);
$last = strtotime($last);

while( $current <= $last ) {

    $dates[] = date($output_format, $current);
    $current = strtotime($step, $current);
}

return $dates;

};