An E-commerce App in action built on top of a Multi-model Database
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The document discusses the native multi-model database ArangoDB, which integrates document, graph, and key/value store functionalities with a unified query language. It highlights its application in aircraft fleet management, offering efficient query capabilities and the ability to handle polyglot persistence in microservices. The document also presents various examples of queries using ArangoDB's AQL, showcasing its powerful features for complex data retrieval.
![Example AQL queries 8
Show complete orders
FOR s IN sales
FOR i IN items
FILTER i._id == s._to
COLLECT bill = s.billingId INTO items
FOR c IN customers
FILTER c._id == items[0].s._from
RETURN { date: items[0].s.date, billingId: bill,
name: c.name, price: SUM(items[*].i.price),
items: items[*].i }](https://image.slidesharecdn.com/multimodeldatabase-ecommerceappwitharangodbaql-170607095706/85/An-E-commerce-App-in-action-built-on-top-of-a-Multi-model-Database-15-320.jpg)
![Example AQL queries 10
Given a customer, find all items he has bought
LET customer = DOCUMENT("customers/hugo")
FOR i IN 1..1 OUTBOUND customer GRAPH "sales"
COLLECT orderId = i.orderId INTO list
RETURN { orderId, description: list[0].i.description,
count: LENGTH(list), customer }](https://image.slidesharecdn.com/multimodeldatabase-ecommerceappwitharangodbaql-170607095706/85/An-E-commerce-App-in-action-built-on-top-of-a-Multi-model-Database-17-320.jpg)
![Example AQL queries 11
Find recommendations
LET customer = DOCUMENT("customers/lulu")
FOR i, e, p IN 3..3 ANY customer GRAPH "sales"
OPTIONS { uniqueVertices: "none", uniqueEdges: "none" }
FILTER p.vertices[2]._key != customer._key
COLLECT orderId = i.orderId INTO list
RETURN { orderId, description: list[0].i.description,
count: LENGTH(list), customer: customer.name,
path: list[0].p.vertices[*]._key }](https://image.slidesharecdn.com/multimodeldatabase-ecommerceappwitharangodbaql-170607095706/85/An-E-commerce-App-in-action-built-on-top-of-a-Multi-model-Database-18-320.jpg)
An E-commerce App in action built on top of a Multi-model Database
- 1. An e-commerce app in action built on top of a multi-model database Max Neunhöffer 6 June 2017 www.arangodb.com
- 2. The Multi-Model Approach Native multi-model database A native multi-model database combines a document store with a graph database and is at the same time a key/value store, with a common query language for all three data models. Important: Is able to compete with specialised products on their turf. Allows for polyglot persistence using a single database technology. In a microservice architecture, there will be several different deployments.
- 3. Use case: Aircraft fleet management
- 4. Use case: Aircraft fleet management One of our customers uses ArangoDB to store each part, component, unit or aircraft as a document model containment as a graph thus can easily find all parts of some component keep track of maintenance intervals perform queries orthogonal to the graph structure thereby getting good efficiency for all needed queries http://radar.oreilly.com/2015/07/ data-modeling-with-multi-model-databases.html
- 5. Why is multi-model possible at all? Document stores and key/value stores Document stores: have primary key, are key/value stores. Without using secondary indexes, performance is nearly as good as with opaque data instead of JSON. Good horizontal scalability can be achieved for key lookups. https://www.arangodb.com/2015/10/benchmark-postgresql-mongodb-arangodb/
- 6. Why is multi-model possible at all? Document stores and graph databases Graph database: would like to associate arbitrary data with vertices and edges, so JSON documents are a good choice. A good edge index, giving fast access to neighbours. This can be a secondary index. Graph support in the query language. Implementations of graph algorithms in the DB engine. https://www.arangodb.com/2015/10/benchmark-postgresql-mongodb-arangodb/
- 7. Powerful query language AQL The built in Arango Query Language allows complex, powerful and convenient queries, with transaction semantics, allowing to do joins, and to do graph queries, AQL is independent of the driver used and offers protection against injections by design.
- 8. Example AQL queries 1 Show new customers from 2016 FOR c IN customers FILTER c.memberSince >= "2016" RETURN c
- 9. Example AQL queries 2 Count all customers FOR c IN customers COLLECT WITH COUNT INTO count RETURN {"number of customers": count}
- 10. Example AQL queries 3 Show the number of new customers in 2015 FOR c IN customers FILTER c.memberSince >= "2015" && c.memberSince < "2016" COLLECT WITH COUNT INTO count RETURN {"number of new customers in 2015": count}
- 11. Example AQL queries 4 Statistics about signup numbers over years FOR c IN customers COLLECT y = SUBSTRING(c.memberSince,0,4) WITH COUNT INTO count SORT y DESC RETURN { year: y, noNewCustomers: count }
- 12. Example AQL queries 5 Show 10 first items with a price over 200 FOR i IN items FILTER i.price >= 200 LIMIT 10 RETURN i
- 13. Example AQL queries 6 Show all sales of October 2016 FOR s IN sales FILTER s.date >= "2016-10-01" && s.date < "2016-11-01" SORT s.date RETURN { date: s.date, billingId: s.billingId }
- 14. Example AQL queries 7 Join the price FOR s IN sales FILTER s.date >= "2016-10-01" && s.date < "2016-11-01" SORT s.date FOR i IN items FILTER i._id == s._to RETURN {date:s.date,billingId:s.billingId,price:i.price}
- 15. Example AQL queries 8 Show complete orders FOR s IN sales FOR i IN items FILTER i._id == s._to COLLECT bill = s.billingId INTO items FOR c IN customers FILTER c._id == items[0].s._from RETURN { date: items[0].s.date, billingId: bill, name: c.name, price: SUM(items[*].i.price), items: items[*].i }
- 16. Example AQL queries 9 Find top sellers (using graph) FOR item IN items LET buyers = (FOR v IN 1..1 INBOUND item GRAPH "sales" RETURN v) LET nr = LENGTH(buyers) SORT nr DESC RETURN { description: item.description, orderId: item.orderId, nrSales: nr }
- 17. Example AQL queries 10 Given a customer, find all items he has bought LET customer = DOCUMENT("customers/hugo") FOR i IN 1..1 OUTBOUND customer GRAPH "sales" COLLECT orderId = i.orderId INTO list RETURN { orderId, description: list[0].i.description, count: LENGTH(list), customer }
- 18. Example AQL queries 11 Find recommendations LET customer = DOCUMENT("customers/lulu") FOR i, e, p IN 3..3 ANY customer GRAPH "sales" OPTIONS { uniqueVertices: "none", uniqueEdges: "none" } FILTER p.vertices[2]._key != customer._key COLLECT orderId = i.orderId INTO list RETURN { orderId, description: list[0].i.description, count: LENGTH(list), customer: customer.name, path: list[0].p.vertices[*]._key }