Hotcode 2013: Javascript in a database (Part 1)
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This document discusses using JavaScript in databases. It describes how JavaScript can be used in the database for transactions defined as functions, graph traversal, and having no backend code, just an API. It provides examples of using JavaScript for transactions and graph traversal in ArangoDB.
![Use Aggregates
Do not Normalize
www.arangodb.org (c) f.celler@triagens.de
{ name: { first: „Frank“, last: „Celler“ },
address: { home: { street: „...“, city: „...“ } },
email: { work: „frank@celler.de“ },
hobbies: [ „C++“, „MRuby“, „JavaScript“ ] }
Samstag, 1. Juni 13](https://image.slidesharecdn.com/javascriptinthedatbase-130601001842-phpapp01/85/Hotcode-2013-Javascript-in-a-database-Part-1-7-320.jpg)
![ArangoDB.explain()
www.arangodb.org (c) f.celler@triagens.de
{
"type": "NoSQL database",
"model": [ "document", "graph", "key-value" ],
"openSource": true,
"license“: "apache",
"version": 1.3,
"builtWith": [ "C", "C++", "js" ],
"Javascript": [ "client side", "server side" ],
"uses": [ "V8" ]
}
Samstag, 1. Juni 13](https://image.slidesharecdn.com/javascriptinthedatbase-130601001842-phpapp01/85/Hotcode-2013-Javascript-in-a-database-Part-1-13-320.jpg)
![db._create("accounts");
db.accounts.save({ _key: "john", amount: 423 });
db.accounts.save({ _key: "fred", amount: 197 });
db._executeTransaction({
collections: {
write: "accounts"
},
params: {
user1: "fred",
user2: "john",
amount: 10
},
action: function (params) {
var db = require("internal").db;
var account1 = db.accounts.document(params['user1']);
var account2 = db.accounts.document(params['user2']);
var amount = params['amount'];
if (account1.amount < amount) {
throw "account of user '" + user1 + "' does not have enough money!";
}
db.accounts.update(account1, { amount : account1.amount - amount });
db.accounts.update(account2, { amount : account2.amount + amount });
/* will commit the transaction and return the value true */
return true;
}
});
www.arangodb.org (c) f.celler@triagens.de
Transactions
Samstag, 1. Juni 13](https://image.slidesharecdn.com/javascriptinthedatbase-130601001842-phpapp01/85/Hotcode-2013-Javascript-in-a-database-Part-1-18-320.jpg)
![db._executeTransaction({
collections: {
write: "accounts"
},
params: {
user1: "fred",
user2: "john",
amount: 10
},
action: function (params) {
var db = require("internal").db;
var account1 = db.accounts.document(params['user1']);
var account2 = db.accounts.document(params['user2']);
var amount = params['amount'];
if (account1.amount < amount) {
throw "account of user '" + user1 + "' does not have enough money!";
}
db.accounts.update(account1, { amount : account1.amount - amount });
db.accounts.update(account2, { amount : account2.amount + amount });
www.arangodb.org (c) f.celler@triagens.de
Transactions
Samstag, 1. Juni 13](https://image.slidesharecdn.com/javascriptinthedatbase-130601001842-phpapp01/85/Hotcode-2013-Javascript-in-a-database-Part-1-19-320.jpg)
![function traverse (graph, start, depth, maxlen) {
var config = {
datasource: traversal.collectionDatasourceFactory(graph._edges),
strategy: Traverser.BREADTH_FIRST,
expander: traversal.anyExpander,
filter: traversal.maxDepthFilter,
maxDepth: depth,
uniqueness: { edges: Traverser.UNIQUE_GLOBAL, vertices: Traverser.UNIQUE_NONE },
visitor: coauthorVisitor(maxlen)
};
var traverser = new Traverser(config);
var result = { positions: {}, vertices: [], links: [], minYear: 0, maxYear: 0 };
var first = graph._vertices.firstExample({ name: start });
if (first !== null) {
traverser.traverse(result, first);
}
return {
start: start,
depth: depth,
minYear: result.minYear,
maxYear: result.maxYear,
vertices: result.vertices,
links: result.links };
}
www.arangodb.org (c) f.celler@triagens.de
Graph Traversal
Samstag, 1. Juni 13](https://image.slidesharecdn.com/javascriptinthedatbase-130601001842-phpapp01/85/Hotcode-2013-Javascript-in-a-database-Part-1-20-320.jpg)
Hotcode 2013: Javascript in a database (Part 1)
- 1. JavaScript in the Database Frank Celler & Lucas Dohmen www.arangodb.org (c) [email protected] Samstag, 1. Juni 13
- 2. The NoSQL Movement www.arangodb.org (c) [email protected] Samstag, 1. Juni 13
- 4. www.arangodb.org (c) [email protected] nosql.eventbrite.com distributed structured data storage Samstag, 1. Juni 13
- 5. Your Entities A Person has a Name, first and last one or more addresses, emails, telephone a list of hobbies, skills, tags www.arangodb.org (c) [email protected] Samstag, 1. Juni 13
- 6. Relational World www.arangodb.org (c) [email protected] PersonPersonPerson AddressAddressAddress HobbyHobbyHobby emailemailemail n-to-mn-to-mn-to-m n-to-mn-to-mn-to-m n-to-mn-to-mn-to-m Samstag, 1. Juni 13
- 7. Use Aggregates Do not Normalize www.arangodb.org (c) [email protected] { name: { first: „Frank“, last: „Celler“ }, address: { home: { street: „...“, city: „...“ } }, email: { work: „[email protected]“ }, hobbies: [ „C++“, „MRuby“, „JavaScript“ ] } Samstag, 1. Juni 13
- 8. Document Databases documents can be as simple as key/value maps or as complex as lists containing embedded sub-documents or anything in between representated in JSON Schema-less www.arangodb.org (c) [email protected] Samstag, 1. Juni 13
- 9. www.arangodb.org (c) [email protected] 9 Samstag, 1. Juni 13
- 10. www.arangodb.org (c) [email protected] 10 Analytic Processing DBsTransaction Processing DBs Managing the evolving state of an IT system Map/Reduce Graphs Extensibility Key/Value Column- Stores Complex Queries Structured Data Massively Distributed Documents Samstag, 1. Juni 13
- 11. Property Graphs www.arangodb.org (c) [email protected] Type: inproceeding Title: Finite Size Effects Type: proceeding Title: Neural Modeling Type: person Name: Anthony C. C. Coolen Label: written Label: published Pages: 99-120 Type: person Name: Snchez-Andrs Label: edited Just Documents Samstag, 1. Juni 13
- 12. Multi-Model Databases www.arangodb.org (c) [email protected] vertices and edges are documents query them using geo-index, full-text, SQL-like queries relations are expressed as graphs traverse them using graph algorithms Samstag, 1. Juni 13
- 13. ArangoDB.explain() www.arangodb.org (c) [email protected] { "type": "NoSQL database", "model": [ "document", "graph", "key-value" ], "openSource": true, "license“: "apache", "version": 1.3, "builtWith": [ "C", "C++", "js" ], "Javascript": [ "client side", "server side" ], "uses": [ "V8" ] } Samstag, 1. Juni 13
- 14. Why Use JavaScript? www.arangodb.org (c) [email protected] Samstag, 1. Juni 13
- 15. JavaScript Everywhere in the Browser Application-Layer (Node.JS) Database www.arangodb.org (c) [email protected] Samstag, 1. Juni 13
- 16. Why is Node not enough? www.arangodb.org (c) [email protected] Samstag, 1. Juni 13
- 17. JavaScript in a Database MVC in the Browser and/or NODE.JS Script-Language in the DB for transactions as functions graph traversal no-backend, just API www.arangodb.org (c) [email protected] Samstag, 1. Juni 13
- 18. db._create("accounts"); db.accounts.save({ _key: "john", amount: 423 }); db.accounts.save({ _key: "fred", amount: 197 }); db._executeTransaction({ collections: { write: "accounts" }, params: { user1: "fred", user2: "john", amount: 10 }, action: function (params) { var db = require("internal").db; var account1 = db.accounts.document(params['user1']); var account2 = db.accounts.document(params['user2']); var amount = params['amount']; if (account1.amount < amount) { throw "account of user '" + user1 + "' does not have enough money!"; } db.accounts.update(account1, { amount : account1.amount - amount }); db.accounts.update(account2, { amount : account2.amount + amount }); /* will commit the transaction and return the value true */ return true; } }); www.arangodb.org (c) [email protected] Transactions Samstag, 1. Juni 13
- 19. db._executeTransaction({ collections: { write: "accounts" }, params: { user1: "fred", user2: "john", amount: 10 }, action: function (params) { var db = require("internal").db; var account1 = db.accounts.document(params['user1']); var account2 = db.accounts.document(params['user2']); var amount = params['amount']; if (account1.amount < amount) { throw "account of user '" + user1 + "' does not have enough money!"; } db.accounts.update(account1, { amount : account1.amount - amount }); db.accounts.update(account2, { amount : account2.amount + amount }); www.arangodb.org (c) [email protected] Transactions Samstag, 1. Juni 13
- 20. function traverse (graph, start, depth, maxlen) { var config = { datasource: traversal.collectionDatasourceFactory(graph._edges), strategy: Traverser.BREADTH_FIRST, expander: traversal.anyExpander, filter: traversal.maxDepthFilter, maxDepth: depth, uniqueness: { edges: Traverser.UNIQUE_GLOBAL, vertices: Traverser.UNIQUE_NONE }, visitor: coauthorVisitor(maxlen) }; var traverser = new Traverser(config); var result = { positions: {}, vertices: [], links: [], minYear: 0, maxYear: 0 }; var first = graph._vertices.firstExample({ name: start }); if (first !== null) { traverser.traverse(result, first); } return { start: start, depth: depth, minYear: result.minYear, maxYear: result.maxYear, vertices: result.vertices, links: result.links }; } www.arangodb.org (c) [email protected] Graph Traversal Samstag, 1. Juni 13
- 21. function traverse (graph, start, depth, maxlen) { var config = { datasource: traversal.collectionDatasourceFactory(graph._edges), strategy: Traverser.BREADTH_FIRST, expander: traversal.anyExpander, filter: traversal.maxDepthFilter, maxDepth: depth, uniqueness: { edges: Traverser.UNIQUE_GLOBAL, vertices: Traverser.UNIQUE_NONE }, visitor: coauthorVisitor(maxlen) }; www.arangodb.org (c) [email protected] Graph Traversal Samstag, 1. Juni 13
- 22. No Back-End? www.arangodb.org (c) [email protected] Samstag, 1. Juni 13
- 23. To Be Continued ... Now Fork me on github Google Group: ArangoDB Twitter: @fceller & @arangodb www.arangodb.org www.arangodb.org (c) [email protected] Stay in Touch: Samstag, 1. Juni 13