sql - MYSQL query on DateTime, find existing bookings -


I have a table that car booked for parking spaces. The minimum booking time is 30 minutes and the maximum booking period can be 1 full day (i.e. a booking never goes on several days). Booking should not overlap, that is, only one car per place at one time, so I first check to see if the booking is available before entering a new booking. 

  ID purchased datedream end time vehicle specid 2 5 2014-04-23 09:00:00 2014-04-23 21:30:00 2 1 3 6 2014-04-25 13:00 : 00 2014-04-25 22:00:00 3 1   
 I want to ask the table, want to supply a start date time, end time and a space and find out Whether there is a booking for that booking at that time. I need to return the query right or wrong.  
 For example, if you contact me with current dataset:  
  startdatetime = 2014-04-23 09: 00: 00 and end time = 2014- 04-23 11:00:00  - The query will return right because the line ID2 defines the booking that exists at supply time.  
  startdate = 2014-04-23 22:00:00 and end time = 2014-04-23 23:30:00  - the query will be incorrect because there are no bookings at that time is.   
 
 
 What you can do with a simple comparison and aggregation:  
 < Select> code> (in case when the count (*)> then 'book' with 'false' and 'true' end) where b.spaceid = @SPACEID and b.startdatetime & lt; @ENDTIME and b.endtatetime & gt; @ Time started;   
 If one starts before the other end, and overlaps again, and ends at the start of the other.  
 Ideally, however, you want to set up the table so that there is no free space and can be booked at the same time. One way to do this is by using a table and a day for each location. For 48 slots (one for each half hour) will be. Instead of a line on each row, you will have a line for each time slot. After this you can do a unique barrier on  spaceid, timelot  and the database will apply this argument to you - possibly with a very low overhead rather than searching the table for overlapping reservations. .

Comments

Post a Comment

Popular posts from this blog

c - Mpirun hangs when mpi send and recieve is put in a loop -

I was trying to use the program to use mifrewan on 4 node clusters. Distributing node 0 data in nodes 1, 2 and 3. In the program, from '90 'to variable values ​​of' dior 'to be calculated. Therefore the node is distributing data and collecting results in an omitted fashion (for different values ​​of var 'dir') when do {*******} Whereas (dir Loop is given, Mippun is hanging, and no output is found. But when I comment on two {*******} (dir The loop output is obtained for the initial value of variable dir dir = -90 ), and that output is correct. The problem occurs when the loop is given. Can anyone help me in solving this problem. #include "mpi.h" int main (int argc, char * argv []) Float dir = -90; Int rank, nanoprakash; MPI_Status status; MPI_Init (& amp; argc, & argv); MPI_Comm_rank (MPI_COMM_WORLD, & amp; Rank); MPI_Comm_size (MPI_COMM_WORLD, & amp; numprocs); If (rank == 0) {/ / data to begin / / (dest = 1; dest ...
Read more

python - Apply coupon to a customer's subscription based on non-stripe related actions on the site -

I can not find anything in the source about using coupons after subscribing to a user's plan. Is it possible to use a coupon to credit a user's membership after initial subscription? If not, what is the best option? Specifically, I want to give a user 100% coupon for that month, when they take 5 [site specific actions]. This is possible, but may not be the best idea. Coupons are currently applied to the stripe, then apply again at the customer level and each client can have a single coupon. So if you are already offering discounts to the coupon, then the customer who is currently in the present will also give up. It also means that if you are using a recently-added multiple subscription capacity, then all of the user's subscription will be ready for the month. Coupons can be set to "Once", only once (as the only name) can be used by any customer, so if this credit can earn more than once, You will have to maintain a 100% discount coupon continuousl...
Read more

java - Unable to get JDBC connection in Spring application to MySQL -

मैंने स्प्रिंग में डीबी कॉन्फ़िगरेशन का पालन किया है: & lt; bean id = "dataSource" Class = "org.apache.commons.dbcp.BasicDataSource" नष्ट-विधि = "बंद" & gt; & Lt; प्रॉपर्टी नाम = "url" मान = "jdbc: dburl" / & gt; & Lt; संपत्ति नाम = "driverClassName" मान = "com.mysql.jdbc.Driver" / & gt; & Lt; संपत्ति नाम = "उपयोगकर्ता नाम" मान = "उपयोगकर्ता नाम" / & gt; & Lt; संपत्ति नाम = "पासवर्ड" मान = "पासवॉर्फ" / & gt; & Lt; प्रॉपर्टी नाम = "हटाए गए हटाए गए" मान = "सही" / & gt; & Lt; गुण नाम = "प्रारंभिक आकार" मान = "3" / & gt; & Lt; संपत्ति नाम = "अधिकतमअक्टिव" मान = "5" / & gt; & Lt; / सेम ​​& gt; डीबी से गुण मूल्यों को लोड करने के लिए अतिरिक्त कॉन्फ़िगरेशन। & lt; bean id = "config1" class = "org.apache.commons.configuration....
Read more