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| <h1 class="page">Conceptual Data Modeling</h1> |
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| <p>First, let’s create a simple domain model that is easy to understand in |
| the relational world, and then see how you might map it from a |
| relational to a distributed hashtable model in Cassandra.</p> |
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| <div class="paragraph"> |
| <p>Let’s use an example that is complex enough to show the various data |
| structures and design patterns, but not something that will bog you down |
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| <p>For example, let’s use a domain that is easily understood and that |
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| <p>The conceptual domain includes hotels, guests that stay in the hotels, a |
| collection of rooms for each hotel, the rates and availability of those |
| rooms, and a record of reservations booked for guests. Hotels typically |
| also maintain a collection of “points of interest,” which are parks, |
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| that guests might want to visit during their stay. Both hotels and |
| points of interest need to maintain geolocation data so that they can be |
| found on maps for mashups, and to calculate distances.</p> |
| </div> |
| <div class="paragraph"> |
| <p>The conceptual domain is depicted below using the entity–relationship |
| model popularized by Peter Chen. This simple diagram represents the |
| entities in the domain with rectangles, and attributes of those entities |
| with ovals. Attributes that represent unique identifiers for items are |
| underlined. Relationships between entities are represented as diamonds, |
| and the connectors between the relationship and each entity show the |
| multiplicity of the connection.</p> |
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| <p>Obviously, in the real world, there would be many more considerations |
| and much more complexity. For example, hotel rates are notoriously |
| dynamic, and calculating them involves a wide array of factors. Here |
| you’re defining something complex enough to be interesting and touch on |
| the important points, but simple enough to maintain the focus on |
| learning Cassandra.</p> |
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| <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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