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| <article class="doc"> |
| <h1 class="page">Defining Database Schema</h1> |
| <div class="paragraph"> |
| <p>Once you have finished evaluating and refining the physical model, |
| you’re ready to implement the schema in CQL. Here is the schema for the |
| <code>hotel</code> keyspace, using CQL’s comment feature to document the query |
| pattern supported by each table:</p> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre class="highlightjs highlight"><code class="language-cql hljs" data-lang="cql">CREATE KEYSPACE hotel WITH replication = |
| {‘class’: ‘SimpleStrategy’, ‘replication_factor’ : 3}; |
| |
| CREATE TYPE hotel.address ( |
| street text, |
| city text, |
| state_or_province text, |
| postal_code text, |
| country text ); |
| |
| CREATE TABLE hotel.hotels_by_poi ( |
| poi_name text, |
| hotel_id text, |
| name text, |
| phone text, |
| address frozen<address>, |
| PRIMARY KEY ((poi_name), hotel_id) ) |
| WITH comment = ‘Q1. Find hotels near given poi’ |
| AND CLUSTERING ORDER BY (hotel_id ASC) ; |
| |
| CREATE TABLE hotel.hotels ( |
| id text PRIMARY KEY, |
| name text, |
| phone text, |
| address frozen<address>, |
| pois set ) |
| WITH comment = ‘Q2. Find information about a hotel’; |
| |
| CREATE TABLE hotel.pois_by_hotel ( |
| poi_name text, |
| hotel_id text, |
| description text, |
| PRIMARY KEY ((hotel_id), poi_name) ) |
| WITH comment = Q3. Find pois near a hotel’; |
| |
| CREATE TABLE hotel.available_rooms_by_hotel_date ( |
| hotel_id text, |
| date date, |
| room_number smallint, |
| is_available boolean, |
| PRIMARY KEY ((hotel_id), date, room_number) ) |
| WITH comment = ‘Q4. Find available rooms by hotel date’; |
| |
| CREATE TABLE hotel.amenities_by_room ( |
| hotel_id text, |
| room_number smallint, |
| amenity_name text, |
| description text, |
| PRIMARY KEY ((hotel_id, room_number), amenity_name) ) |
| WITH comment = ‘Q5. Find amenities for a room’;</code></pre> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p>Notice that the elements of the partition key are surrounded with |
| parentheses, even though the partition key consists of the single column |
| <code>poi_name</code>. This is a best practice that makes the selection of |
| partition key more explicit to others reading your CQL.</p> |
| </div> |
| <div class="paragraph"> |
| <p>Similarly, here is the schema for the <code>reservation</code> keyspace:</p> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre class="highlightjs highlight"><code class="language-cql hljs" data-lang="cql">CREATE KEYSPACE reservation WITH replication = {‘class’: |
| ‘SimpleStrategy’, ‘replication_factor’ : 3}; |
| |
| CREATE TYPE reservation.address ( |
| street text, |
| city text, |
| state_or_province text, |
| postal_code text, |
| country text ); |
| |
| CREATE TABLE reservation.reservations_by_confirmation ( |
| confirm_number text, |
| hotel_id text, |
| start_date date, |
| end_date date, |
| room_number smallint, |
| guest_id uuid, |
| PRIMARY KEY (confirm_number) ) |
| WITH comment = ‘Q6. Find reservations by confirmation number’; |
| |
| CREATE TABLE reservation.reservations_by_hotel_date ( |
| hotel_id text, |
| start_date date, |
| end_date date, |
| room_number smallint, |
| confirm_number text, |
| guest_id uuid, |
| PRIMARY KEY ((hotel_id, start_date), room_number) ) |
| WITH comment = ‘Q7. Find reservations by hotel and date’; |
| |
| CREATE TABLE reservation.reservations_by_guest ( |
| guest_last_name text, |
| hotel_id text, |
| start_date date, |
| end_date date, |
| room_number smallint, |
| confirm_number text, |
| guest_id uuid, |
| PRIMARY KEY ((guest_last_name), hotel_id) ) |
| WITH comment = ‘Q8. Find reservations by guest name’; |
| |
| CREATE TABLE reservation.guests ( |
| guest_id uuid PRIMARY KEY, |
| first_name text, |
| last_name text, |
| title text, |
| emails set, |
| phone_numbers list, |
| addresses map<text, |
| frozen<address>, |
| confirm_number text ) |
| WITH comment = ‘Q9. Find guest by ID’;</code></pre> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p>You now have a complete Cassandra schema for storing data for a hotel |
| application.</p> |
| </div> |
| <div class="paragraph"> |
| <p><em>Material adapted from Cassandra, The Definitive Guide. Published by |
| O’Reilly Media, Inc. Copyright © 2020 Jeff Carpenter, Eben Hewitt. All |
| rights reserved. Used with permission.</em></p> |
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