New Horizons Requirements¶
We continue our case here about the imaginary company New Horizons as introduced in the previous section Example: New Horizons . We focus here on the exact requirements for processing an accepted booking, in particular the way it should be stored in a relational database. The relational database is for internal use by New Horizons and can be developed from scratch.
The database we want to fill has the following tables:
Table booking ------------- id: int, primary key travelerId: int price: money fee: booking Table visit ----------- bookingId: int, part of primary key, foreign key referencing booking seq: int, part of primary key hostId: int productId: int startDate: date endDate: date price: money
Note that bookings, hosts and travelers are referenced by integer id fields. Additional information about travelers and hosts, like name, address, thelephone are omitted because they do not have to be stored with a booking. Every visit has a price, the amount that should be paid to the host. In table booking, we store the price that should be paid by the traveler to New Horizons, and the fee kept by New Horizons. Each visit has a productId that references some other table that is not elaborated here. That other table links a product id to a room number in a hotel, a particular spot on a camping, or some other description of the accommodation ordered. Finally, each visit has a start date and an end date.
We assume that the acceptance of a booking is preceded by some user interaction in which the user selects destinations and picks dates. Therefore, the values of the booking id, the traveler id, the host id and the product id can appear in the incoming message for accepted bookings. We finish this section with an example of an accepted booking:
<booking id="1"> <travelerId>2</travelerId> <price>500.00</price> <fee>100.00</fee> <destination hostId="3" productId="4"> <price>400.00</price> <startDate>2018-12-27</startDate> <endDate>2019-01-02</endDate> </destination> </booking>