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Logic when checking availability of slot bookings in SQL


Logic when checking availability of slot bookings in SQL

By : Grigor Yenoqyan
Date : November 16 2020, 03:01 PM
may help you . I have simple testing system that has fixed time slots linked to a laptop for training days called event_machine_time , Try this.
code :
SELECT * 
FROM event_information A
inner join event_machine_time B on (1=1) 
left join event_booking C on (B.id = C.machine_time_id and A.id = C.information_id ) 
WHERE A.id = '1'


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Availability Calculating logic in php

Availability Calculating logic in php


By : user5700628
Date : March 29 2020, 07:55 AM
I wish did fix the issue. , I would do the calculation in SQL by having a smarter query.
code :
select 
    ChallanId,
    UnitCostPrice,
    sum(`ItemIn`)-sum(`ItemOut`) as AvailableQty,
    (sum(`ItemIn`)-sum(`ItemOut`))*UnitCostPrice as totalPrice
from tbl
group by ChallanId
Which loops to use for achieving time slot availability in Groovy

Which loops to use for achieving time slot availability in Groovy


By : Zhenchao Zhang
Date : March 29 2020, 07:55 AM
With these it helps I am trying to create booking on some time slot but i am not sure that time slot is available. So i have to check slot availability.
code :
def isAvailable = false
def SDT = context.expand('${#Project#StartDateTime}') 
def EDT = context.expand('${#Project#EndDateTime}')
while( isAvailable==false ) 
{
//Running while loop and checking slot availability.
def res = con.firstRow("select * from tblbookingitem where active=1 and fkItemID=$roomID and DateTimeFrom='$SDT' and DateTimeTo='$EDT'" )

if(res== null) // if null that means slot is available
    {
        //Time slot is available."
        isAvailable=true; // you can use even break statment here
        context.testCase.testSuite.project.setPropertyValue('StartDateTime', SDT)
        context.testCase.testSuite.project.setPropertyValue('EndDateTime', EDT)
        log.info SDT
        log.info EDT
        break;       
    }
else
    {
        //Increment Start and End Time
        SDT=EDT
        def slotinterval = context.expand('${#Project#SlotInterval}').toInteger()
        log.info "Slot Interval : " + slotinterval

        date1 =  new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss.SSS'Z'").parse(EDT)
        use(TimeCategory) 
        {
            def date2 = date1 + slotinterval.minutes
            def outputDateFormat = "yyyy-MM-dd'T'HH:mm:ss.SSS'Z'"
            EDT = "${date2.format(outputDateFormat)}"                       
        }

    }

}
Checking for overlapping bookings in Postgresql

Checking for overlapping bookings in Postgresql


By : sandeep bashyal
Date : March 29 2020, 07:55 AM
wish help you to fix your issue You should compare each row with each other and show two overlapping ones in a single result row, example:
code :
with booking_bookingitem(car_id, booking_id, date_start, date_end) as (
values
    (1, 1, '2018-05-01'::date, '2018-05-03'::date),
    (1, 2, '2018-05-05', '2018-05-07'),
    (1, 3, '2018-05-11', '2018-05-13'), -- 
    (1, 4, '2018-05-14', '2018-05-16'), -- collision
    (1, 5, '2018-05-21', '2018-05-23')
)

select 
    bi.car_id, 
    bi.booking_id, bi.date_start, bi.date_end,
    bt.booking_id, bt.date_start, bt.date_end
from booking_bookingitem bi 
join booking_bookingitem bt 
on (bi.date_start- 1, bi.date_end+ 1) overlaps (bt.date_start- 1, bt.date_end+ 1) and bi.booking_id < bt.booking_id
where bi.date_start between current_date and current_date+ 30


 car_id | booking_id | date_start |  date_end  | booking_id | date_start |  date_end  
--------+------------+------------+------------+------------+------------+------------
      1 |          3 | 2018-05-11 | 2018-05-13 |          4 | 2018-05-14 | 2018-05-16
(1 row)
Time Slot Booking Script - Check availability

Time Slot Booking Script - Check availability


By : mintyfreshpenguin
Date : March 29 2020, 07:55 AM
around this issue You can use a query like this. It count first the free slots and the you can query the requested slots in the outer SELECT:
code :
SELECT * from (
SELECT ts.*
            , @sclotcount := IF( ts.`slotstate` = 1, 0, @sclotcount +1 ) as freeslots
    FROM timeslots ts
    CROSS JOIN ( SELECT @sclotcount := 0) as init
    ORDER by id DESC
) as result
WHERE freeslots >= 3 -- request slots
ORDER by id;
MariaDB [test]> SELECT * from ( SELECT ts.*, @sclotcount := IF( ts.`slotstate` = 1, 0, @sclotcount +1 ) as freeslots FROM timeslots ts CROSS JOIN ( SELECT @sclotcount := 0) as init ORDER by id DESC ) as result WHERE freeslots >= 3  ORDER by id;
+----+----------+-----------+-----------+
| id | slottime | slotstate | freeslots |
+----+----------+-----------+-----------+
|  1 | 00:00:00 |         0 |         3 |
| 10 | 02:15:00 |         0 |         3 |
| 14 | 03:15:00 |         0 |         7 |
| 15 | 03:30:00 |         0 |         6 |
| 16 | 03:45:00 |         0 |         5 |
| 17 | 04:00:00 |         0 |         4 |
| 18 | 04:15:00 |         0 |         3 |
| 22 | 05:15:00 |         0 |        75 |
| 23 | 05:30:00 |         0 |        74 |
| 24 | 05:45:00 |         0 |        73 |
...
| 83 | 20:30:00 |         0 |        14 |
| 84 | 20:45:00 |         0 |        13 |
| 85 | 21:00:00 |         0 |        12 |
| 86 | 21:15:00 |         0 |        11 |
| 87 | 21:30:00 |         0 |        10 |
| 88 | 21:45:00 |         0 |         9 |
| 89 | 22:00:00 |         0 |         8 |
| 90 | 22:15:00 |         0 |         7 |
| 91 | 22:30:00 |         0 |         6 |
| 92 | 22:45:00 |         0 |         5 |
| 93 | 23:00:00 |         0 |         4 |
| 94 | 23:15:00 |         0 |         3 |
+----+----------+-----------+-----------+
80 rows in set (0.001 sec)

MariaDB [test]> 
How to check for availability for a nested variable without checking all the preceding variable availability, in ReactNa

How to check for availability for a nested variable without checking all the preceding variable availability, in ReactNa


By : user3272203
Date : March 29 2020, 07:55 AM
wish of those help Currently, optional chaining is a stage 3 draft, and so, you may be able to do it in the future.
EDIT: Optional chaining will now be part of ES2020, and so you'll be able to do the following:
code :
if (self.user?.company?.pic?.phoneNumber !== undefined) { 
  doSomething(); // phoneNumber exists
}
const optional_chain = (obj, [key, ...props]) =>
  obj !== undefined && key ? optional_chain(obj[key], props) : obj;

const user = {
  company: {
    pic: {
      phoneNumber: 1
    }
  }
}

console.log(optional_chain(user, ['company', 'pic', 'phoneNumber'])); // 1
console.log(optional_chain(user, ['company', 'pic', 'phoneNumber', 'x'])); // undefined
console.log(optional_chain(user, ['company', 'picture', 'phoneNumber'])); // undefined
console.log(optional_chain(user, ['x', 'picture', 'phoneNumber'])); // undefined
if (optional_chain(self.user, ['company', 'pic', 'phoneNumber']) !== undefined) { 
  doSomething(); 
}
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