Holdy | Lightweight , Easy to use container for any fragment | Dependency Injection library
kandi X-RAY | Holdy Summary
kandi X-RAY | Holdy Summary
Android Library that can easily load any fragment in a provided container. library encourage us to use maximum fragments which reducing application size. With holdy you can easily deal with many fragments.
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Top functions reviewed by kandi - BETA
- Initializes the Activity
- Load a given fragment
- Apply the font for a toolbar title
- Initializes the activity binding
- Initializes the navigation listener
- Creates a new instance of HoldyBuilder
- Initializes the regular typeface
- Set the default theme
- Get regular typeface
- Override this method to return true if the menu item is selected
- Override this method when the menu item is selected
- OnCreateOptionsMenu menu
- On createView
Holdy Key Features
Holdy Examples and Code Snippets
Community Discussions
Trending Discussions on Holdy
QUESTION
I am an absolute beginner when it comes to SQL, and I'm trying to figure out how to do a simple integrity check. I am modelling a hotel registration system with four tables: Hotel, Room, Booking and Guest. What I'm interested in is in the booking table, which has attributes hotelNo, guestNo, dateFrom, dateTo, roomNo, where the first three are a composite primary key. Now then, the issue at hand is that under the current system, two people might have the same room booked at the same time, which would obviously be a problem in real life. I imagine that a solution might start to look something like
...ANSWER
Answered 2020-Apr-08 at 16:45In your model, the HOTEL and GUEST tables are okay (they may need some more columns later, but that's not a problem). For ROOM, you have decided to use a composite PK. However, a single column as ID would suffice. In BOOKING, the foreign key referencing HOTEL is redundant. Guests are booking rooms (which have a unique ID, and are tied to a HOTEL already) at certain days.
It may help (your learning) to auto-generate the IDs, and define different "start" values for them - when querying the tables at a later stage, you will recognise the IDs immediately eg HOTELs could have 1000+, rooms could have 2000+ etc (see DDL code below).
When following the link provided by @Abra, you have seen that triggers etc can be used for solving the problem. The solution below is inspired by this answer (also mentioned as "option 4" here), and uses the idea of breaking down bookings into days ("slots"), which can then be used for unique (or PK) constraints. Please read the comments, as they contain more explanations.
DDL code
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