January 2018
Intermediate to advanced
336 pages
7h 56m
English
Content preview from Microservices with Clojure
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Data model
Datomic stores data as facts with each fact being a five-tuple (https://en.wikipedia.org/wiki/Tuple). These facts are called Datoms. Each datom consists of an Entity ID, Attribute, and Value that form the first three parts of the five-tuple. The fourth part defines the timestamp at which the fact was created and holds true. The fifth part consists of a boolean value that determines whether the defined datom is an addition or retraction of a fact. Multiple datoms of the same entity can be represented as an entity map with an attribute and value as key-value pairs. The Entity ID for the entity map is defined using the key :db/id:
In the preceding example, there are four attributes—order/name, :order/status, :order/rating, and
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