I want to check if any other room is available between check in and check out date. If a single day also booked between the submitted date, that room should not be included. Image shows the booked room. If I enter check in date like 2016-05-16 and check out date like 2016-05-21 then total no of booked room should be answered as 9 for hotel id=1
My code is like-
='$i' and end_date='$i') and hotel_id='1'");
$rows=mysql_fetch_row($sel);
$count[]=$rows[0];
echo ''.$i.$rows[0];
}
foreach($count as $c)
{
echo "---".$c;
}
?>
I don't know the SQL you are using so I will do a general approach trying to help you.
What you need there is the SQL BETWEEN Operator, in partitucular its negative, NOT BETWEEN in order to check if the room is empty.
The logic would be, I want to query every empty room, this means that today's date should not be between check in and check out dates.
Your query should look something like:
SELECT * FROM TableName
WHERE NOW() NOT BETWEEN start_date AND end_date;
As a recommendation I suggest you to read How to Ask to get more accurate help in the future.
Hope this helped you :)
Related
I'm working on a reservation/booking system for a small hotel. I'm pretty good with PHP but not so good with SQL... I made a form where you enter your information, number of rooms and select arrival date and check-out date using a calendar.
Now everything went good until I got to the point where you have to check which rooms are available and it's giving me a headache. There are 10 rooms you can book.
I currently have one table in MySQL storing the information, dates, booking-ID and room-ID/number.
How would you make the SQL for checking which rooms that are available and not?
Should it look something like
"SELECT * FROM bookings WHERE checkinDate >= '$formCheckin'
AND checkoutDate <= '$formCheckout' "
and then get the roomID and count them?
Any help is very appreciated!
If you want to know if a room is available during a period, then the logic looks like:
SELECT r.*
FROM rooms r
WHERE NOT EXISTS (SELECT 1
FROM bookings b
WHERE b.roomid = r.roomid AND
b.checkinDate <= $formCheckOut AND
b.checkoutDate >= '$formCheckIn
);
I'm not sure if the equality comparison is needed for both of these. The logic is that a room is available if there are no bookings that start before the checkout date and that end after the check in date.
However, for ten rooms, I might suggest that you just keep a table of each room by day, say for the next ten years (add another year once per year). Such a table isn't very big and it is probably easier to understand how to use it. Plus, you can handle things like a couple reserve the room for a week, but only one person is in the room for the first 3 days.
Say I have a table like this :
Say I want to select a column from id = 4 and date=2014/2/14
I must say mysql like this:
$db = new mysqli("localhost",'root','','myDatabase');
$sql = "SELECT * FROM myTable WHERE id=`4`";
$result= $db->query($sql);
while($row = $result->fetch_object()){
$time = $row->"2014/2/14";
echo $time;
}
And this will result like this:
9-10AM
So far it's OK with no problem
But say I want to select 6 coumun after 2014/2/14 too!!
every time I select an id an a date like 2014/2/14 , I want to show 6 day after 2014/2/14
I mean I expect result to be like this(continuing my example):
bold
9-10AM
8-10AM
9-10AM
6-7PM
for god sake, please don bit around the bushes
see:
how to do this?
Since a 75K trolling user (who now covered his tracks by deleting all comments) thinks it is wise to first teach you about complicated things like SQL injection and how to prevent this here we go. So better first read through these links you won't learn anything since it expects you to know the basics but we do not seem to care here in this community.
http://www.us-cert.gov/sites/default/files/publications/Practical-SQLi-Identification.pdf
http://www.cc.gatech.edu/fac/Alex.Orso/papers/halfond.viegas.orso.ISSSE06.pdf
http://web.archive.org/web/20070928163708/http://www.ngssoftware.com/papers/advanced_sql_injection.pdf
https://media.blackhat.com/us-13/US-13-Salgado-SQLi-Optimization-and-Obfuscation-Techniques-WP.pdf
While we are learning already about injection it might be wise to know how to optimize your database too since you are talking about large numbers.
http://www.mysqlperformanceblog.com/files/presentations/UC2005-Advanced-MySQL-Performance-Optimization.pdf
And a comprehensive guide to working with date and time since you want to work with date and time.
http://oreilly.com/catalog/mysqlian/chapter/ch06.pdf
(believe me, i would have written all these guides down here for future reference but that would take to much time, so forgive me that i just post the links).
Now you are probably a view years older and know pretty much about MySQL, yet i leave my original answer here for others that might bump into the same problem. You have to look into normalization of your database. Mysql can look for time and dates if they are records inside a table. Not if they are column headers.
name your columns like: ID - date - time
Now you can search for a certain time with BETWEEN like this:
WHERE date BETWEEN (yourdate) AND (yourdate + INTERVAL 7 DAY)
This will result in picking all records from the date you select plus 7 days.
-edit-
As for your comment, name your tables like ID - doctor - date - time
Now if you want to see all doctors availability in the comming week between 9:00 and 12:00 do:
$doctorQuery = mysql_query("SELECT doctor FROM theTable WHERE date BETWEEN (NOW()) AND (NOW() + INTERVAL 7 DAY) AND date TIME 9:00:00 AND 12:00:00");
while ($result = mysql_fetch_assoc($doctorQuery))
{
echo $result['doctor']; //you can output it here already.
$resultarray[] = $result; //or store it for later in a 3 dimensional array.
}
foreach ($resultArray = $singleRow)
{
echo $singleRow['doctor']; //And output it whenever you want.
}
Forgive me, i'm little rusty and this all is not tested. But this should sent you in the right direction. Please for your own sake, believe us and do not create collumns with dates as headers. This will cause problems later on, one reason is, in two years from now you would have added 730 columns to your table. Of course you could use the dates from my table to output them as headers on your website to make it humanly readable.
-Another edit-
As for you latest comment you probably need a table structure like this:
table for doctors and there info:
[doctorID]-[doctorName]-[doctorInfo]-[LinkToPicture]
Here you fill in a single row for every doctor you have.
Table for there work times:
[timeID]-[doctorID]-[date]-[workhours]
doctorID is a link key, or foreign key which tells the table to which doctor this row belongs. Here fill in the date and time the doctor works. You can insert as many records as you want for each doctor.
I have problem thinking this trough with PHP & Mysql. I have read How to implement check availability in hotel reservation system and some more but they seem different.
I have to make a reservation system on which a converence room can be booked for 6hours minimal, so when a user make a reservation on a date e.g 24/04/2012 he then selects the start time of the rental (00:00-06:00, 06:00-12:00, 12:00-18:00,18:00-24:00). And the total number of hours(6,12,18 etc..) the user wants to rent the room.
The date is stored as a integer(timestamp).
I have two problems with this; I don´t know how to receive all possible days of a month on which the room is still up for reservation and how to check if a new reservation is possible.
I know how to calculate the start date and end date on the users input but I cant find the correct mysql query or php check for availability.
It's probably really simple but somehow because the end date is always variable I just cant find the answer.
Thanks in advance guys!
EDIT Table structure: reservations
id int(11)
user_id int(11)
reservation_name varchar(255)
start_date int(11)
end_date int(11)
I believe reservations is the only one relevant
You'll find it's pretty difficult to generate a list of available days in MySQL. I recommend instead that you select an ordered list of booked days within your desired month, then loop over all days of that month in PHP skipping the day if it matches the next booked day from your MySQL query. The answer to this question will help you to build the dates over which you want to loop in PHP. In pseudocode:
$booked_days = sql(select all booked days in month order by day);
for each $day in month {
if $day != current($booked_days) {
// $day is not booked
} else advance_next($booked_days);
}
To check if a new reservation is possible, you might want to have a look at my answer to a very similar question earlier today.
This brilliant simple MySQL query must do the trick:
Checking for overlapping car reservations
This solution is only for "dates" but You can simply aggregate it with additional "hours"
I'm designing a car booking system and I'm trying to write a query that will check whether a car is available. What I want the query to do in english is to check that the start hire and end hire selected which are stored in variables $mysql_startdate and $mysql_enddate do not overlap with any existing bookings.
I have checked that the variables in the query have the value that they should have so I'm guessing there is a problem with my syntax, most likely the last part.
Format of datetime variables:
$mysql_startdate = 2012-03-22 00:00
$mysql_enddate = 2012-03-23 00:00
I am getting no errors from mysql_error, the problem is that no results are displayed even if a car that is available is requested.
$query = "SELECT c.*,b.startHire,b.endHire FROM cars c JOIN bookings b WHERE c.currentBranch = '$pickUpLocation' AND NOT (b.startHire > '$mysql_enddate' OR b.endHire < '$mysql_startdate')";
The startHire and endHire fields in the database are set to datetime and have the format - 2012-03-02 00:00:00 etc.
Can you help me to identify the problem and amend the sql query?
Let me know if you need any further code/information.
Thank you!
Try that:
SELECT c.*, b.startHire, b.endHire
FROM cars c JOIN bookings b
WHERE c.currentBranch = '$pickUpLocation'
AND NOT b.startHire between '$mysql_startdate' and '$mysql_enddate'
and not b.endHire between '$mysql_startdate' and '$mysql_enddate'
I have been searching for an answer to this dilemma but found nothing. I was hoping you could help to find out what I am doing wrong.
I have a mysql query that selects only apartmens available as follow:
SELECT *
FROM apartments
WHERE apartment_ID NOT IN (SELECT apartment_ID
FROM bookings
WHERE startDate <= '$endingdate'
AND endDate >= '$startingdate')
The problem is that this query is not considering that i.e. departure day is an half day and it is available.
To explain better:
if table "booking" has a booking ending on 16-01-2011 and the search is from the 16-01-2011. The apartment should be available because that is an "half" day (the day of departure). The query seems to not consider this and does not show the apartment.
Please could you help?
Francesco
I'm not that familiar with MySQL data types , but are you sure that startDate and endDate are not stored with a time part as well. If that's the case then "16-01-2011 16:25" would not be less than or equal to "16-01-2011".
Take out the = signs from your sub query, or at least the last one if a place vacated on a date is always available on that date. That should check for apartments being vacated on the requested date. Also make sure that your data is escaped.
If availabilty depends on time then you will need to change your date fields to datetimes.