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Leveraging the Power of Graph Databases in PHP

The document discusses leveraging graph databases in PHP applications. It provides an overview of graph databases, their data model consisting of nodes, properties and relationships. It then demonstrates connecting to Neo4j from PHP using the Neo4jPHP wrapper, querying the graph database with Cypher, and modeling a news feed content structure as a graph of connected content nodes. Sample code is shown for adding new content nodes to a user's news feed graph through a LASTPOST relationship.

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Leveraging the Power of Graph Databases in PHP Jeremy Kendall Nashville PHP November 2014
Obligatory Intro Slide
Also - New Father
What Kind of Database?
Graphs != Charts https://www.flickr.com/photos/markgroves/3065192499/
Graphs != Charts http://stephenwildish.tumblr.com/post/101408321763/friday-project-witch-moral-compass
Graph Databases
Graph Databases • Data Model! • Nodes with properties • Typed relationships
Graph Databases • Data Model! • Nodes with properties • Typed relationships • Strengths! • Highly connected data • ACID
Graph Databases • Data Model! • Nodes with properties • Typed relationships • Strengths! • Highly connected data • ACID • Weaknesses! • Paradigm shift
Graph Databases • Data Model! • Nodes with properties • Typed relationships • Strengths! • Highly connected data • ACID • Weaknesses! • Paradigm shift • Examples! • Neo4j, Titan, OrientDB
Why Care?
Why Care? • All the NoSQL Joy • Schema-less • Semi-structured data
Why Care? • All the NoSQL Joy • Schema-less • Semi-structured data • Escape from JOIN Hell
Why Care? • All the NoSQL Joy • Schema-less • Semi-structured data • Escape from JOIN Hell • Speed
Why Care?
Why Care? • Relationships have 1st class status
Why Care? • Relationships have 1st class status • Just as important as the objects connecting them
Why Care? • Relationships have 1st class status • Just as important as the objects connecting them • You can have properties & labels
Why Care? • Relationships have 1st class status • Just as important as the objects connecting them • You can have properties & labels • Multiple relationships
Why Care?
Speed Depth MySQL Query Time Neo4j Query Time Records Returned 2 0.028 (28 MS) 0.04 ~900 3 0.213 0.06 ~999 4 10.273 0.07 ~999 5 92.613 0.07 ~999 1,000 people with an average 50 friends each
Crazy Speed Depth MySQL Query Time Neo4j Query Time Records Returned 2 0.016 (16 MS) 0.01 ~2500 3 30.27 0.168 ~125,000 4 1543.505 1.359 ~600,000 5 Stopped after 1 hour 2.132 ~800,000 1,000,000 people with an average 50 friends each
Neo4j + Cypher
Cypher • Neo4j’s declarative query language • Easy to pick up • Some clauses and concepts familiar from SQL
Simple Example
Goal
Create Some Nodes CREATE (jk:Person { name: "Jeremy Kendall" })! CREATE (gs:Company { name: "Graph Story" })! ! CREATE (tn:State { name: "Tennessee" })! CREATE (memphis:City { name: "Memphis" })! CREATE (nashville:City { name: "Nashville" })! ! CREATE (hotchicken:Food { name: "Hot Chicken" })! CREATE (bbq:Food { name: "Barbecue" })! CREATE (photography:Hobby { name: "Photography" })! CREATE (language:Language { name: "PHP" })! ! // . . . snip . . .!
Create Some Relationships // . . . snip . . .! ! CREATE (jk)-[:WORKS_AT { title: {"CTO"}]->(gs),! (jk)-[:LIVES_IN]->(memphis)-[:LIVED_IN]->(nashville),! (hotchicken)-[:ONLY_IN]->(nashville),! (bbq)-[:ONLY_IN]->(memphis),! (jk)-[:LOVES]->(hotchicken),! ! // . . . snip . . .!
Create Some Relationships // . . . snip . . .! ! CREATE (jk)-[:WORKS_AT { title: {"CTO"}]->(gs),! (jk)-[:LIVES_IN]->(memphis)-[:LIVED_IN]->(nashville),! (hotchicken)-[:ONLY_IN]->(nashville),! (bbq)-[:ONLY_IN]->(memphis),! (jk)-[:LOVES]->(hotchicken),! ! // . . . snip . . .!
Create Some Relationships // . . . snip . . .! ! CREATE (jk)-[:WORKS_AT { title: {"CTO"}]->(gs),! (jk)-[:LIVES_IN]->(memphis)-[:LIVED_IN]->(nashville),! (hotchicken)-[:ONLY_IN]->(nashville),! (bbq)-[:ONLY_IN]->(memphis),! (jk)-[:LOVES]->(hotchicken),! ! // . . . snip . . .!
Create Some Relationships // . . . snip . . .! ! CREATE (jk)-[:WORKS_AT { title: {"CTO"}]->(gs),! (jk)-[:LIVES_IN]->(memphis)-[:LIVED_IN]->(nashville),! (hotchicken)-[:ONLY_IN]->(nashville),! (bbq)-[:ONLY_IN]->(memphis),! (jk)-[:LOVES]->(hotchicken),! ! // . . . snip . . .!
Example Cypher Query MATCH (p:Person { name: "Jeremy Kendall" })-[:LOVES]->(l)! WITH p, l! MATCH (p)-[:WORKS_AT]->(j)! WITH p, l, j! MATCH (p)-[:LIVES_IN]->(c:City)-[:LIVED_IN*0..]->(o:City)! RETURN p, l, j, o
Example Cypher Query MATCH (p:Person { name: "Jeremy Kendall" })-[:LOVES]->(l)! WITH p, l! MATCH (p)-[:WORKS_AT]->(j)! WITH p, l, j! MATCH (p)-[:LIVES_IN]->(c:City)-[:LIVED_IN*0..]->(o:City)! RETURN p, l, j, o
Example Cypher Query MATCH (p:Person { name: "Jeremy Kendall" })-[:LOVES]->(l)! WITH p, l! MATCH (p)-[:WORKS_AT]->(j)! WITH p, l, j! MATCH (p)-[:LIVES_IN]->(c:City)-[:LIVED_IN*0..]->(o:City)! RETURN p, l, j, o
Example Cypher Query MATCH (p:Person { name: "Jeremy Kendall" })-[:LOVES]->(l)! WITH p, l! MATCH (p)-[:WORKS_AT]->(j)! WITH p, l, j! MATCH (p)-[:LIVES_IN]->(c:City)-[:LIVED_IN*0..]->(o:City)! RETURN p, l, j, o
Example Cypher Query MATCH (p:Person { name: "Jeremy Kendall" })-[:LOVES]->(l)! WITH p, l! MATCH (p)-[:WORKS_AT]->(j)! WITH p, l, j! MATCH (p)-[:LIVES_IN]->(c:City)-[:LIVED_IN*0..]->(o:City)! RETURN p, l, j, o
Example Cypher Query MATCH (p:Person { name: "Jeremy Kendall" })-[:LOVES]->(l)! WITH p, l! MATCH (p)-[:WORKS_AT]->(j)! WITH p, l, j! MATCH (p)-[:LIVES_IN]->(c:City)-[:LIVED_IN*0..]->(o:City)! RETURN p, l, j, o
Example Cypher Query MATCH (p:Person { name: "Jeremy Kendall" })-[:LOVES]->(l)! WITH p, l! MATCH (p)-[:WORKS_AT]->(j)! WITH p, l, j! MATCH (p)-[:LIVES_IN]->(c:City)-[:LIVED_IN*0..]->(o:City)! RETURN p, l, j, o
Query Result
Neo4j + PHP
Neo4jPHP • PHP wrapper for the Neo4j REST API • Installable via Composer • Used internally at Graph Story • Used in this presentation • Well tested • https://packagist.org/packages/everyman/ neo4jphp
Also see: NeoClient • Written by Neoxygen • Alternative PHP wrapper for the Neo4j REST API • Installable via Composer • Under review for internal use at Graph Story • Well tested • https://packagist.org/packages/neoxygen/neoclient
Connecting $neo4jClient = new EverymanNeo4jClient(! ‘yourgraph.example.com’, ! 7473! );! ! $neo4jClient->getTransport()! ->setAuth('username', 'password')! ->getTransport()->useHttps();
Creating a Node and Label $node = new Node($neo4jClient);! ! $label = $neo4jClient->makeLabel('Person');! ! $node->setProperty('name', ‘Jeremy Kendall');! ! $node->save()->addLabels(array($label));
Searching // Searching for a label by property! $label = $neo4jClient->makeLabel('Person');! $nodes = $label->getNodes('name', $name);
Querying (Cypher) $queryString = ! 'MATCH (p:Person { name: { name }}) RETURN p';! ! $query = new EverymanNeo4jCypherQuery(! $neo4jClient,! $queryString,! ['name' => ‘Jeremy Kendall']! );! ! $result = $query->getResultSet();
Named Parameters
Named Parameters $queryString = ! 'MATCH (p:Person { name: { name }}) RETURN p';! ! $query = new EverymanNeo4jCypherQuery(! $neo4jClient,! $queryString,! ['name' => ‘Jeremy Kendall']! );! ! $result = $query->getResultSet();
Named Parameters $queryString = ! 'MATCH (p:Person { name: { name }}) RETURN p';! ! $query = new EverymanNeo4jCypherQuery(! $neo4jClient,! $queryString,! ['name' => ‘Jeremy Kendall']! );! ! $result = $query->getResultSet();
Content Modeling: News Feeds
News Feed • Modeled as a list of posts • Newest post first • All subsequent posts follow • Relationships: LASTPOST and NEXTPOST
LASTPOST
NEXTPOST
The Content Model class Content! {! public $node;! public $nodeId;! public $contentId;! public $title;! public $url;! public $tagstr;! public $timestamp;! public $userNameForPost;! public $owner = false;! }
Adding Content public static function add($username, Content $content)! {! $queryString =<<<CYPHER! MATCH (user { username: {u}})! OPTIONAL MATCH (user)-[r:LASTPOST]->(lastpost)! DELETE r! CREATE (user)-[:LASTPOST]->(p:Content { title:{title}, url:{url}, tagstr:{tagstr}, timestamp:{timestamp}, contentId: {contentId} })! WITH p, collect(lastpost) as lastposts! FOREACH (x IN lastposts | CREATE p-[:NEXTPOST]->x)! RETURN p, {u} as username, true as owner! CYPHER;! ! $query = new Query(! Neo4jClient::client(),! $queryString,! array(! 'u' => $username,! 'title' => $content->title,! 'url' => $content->url,! 'tagstr' => $content->tagstr,! 'timestamp' => time(),! 'contentId' => uniqid()! )! );! $result = $query->getResultSet();! ! return self::returnMappedContent($result);! }
Adding Content public static function add($username, Content $content)! {! $queryString =<<<CYPHER! MATCH (user { username: {u}})! OPTIONAL MATCH (user)-[r:LASTPOST]->(lastpost)! DELETE r! CREATE (user)-[:LASTPOST]->(p:Content { title:{title}, url:{url}, tagstr:{tagstr}, timestamp:{timestamp}, contentId: {contentId} })! WITH p, collect(lastpost) as lastposts! FOREACH (x IN lastposts | CREATE p-[:NEXTPOST]->x)! RETURN p, {u} as username, true as owner! CYPHER;! ! $query = new Query(! Neo4jClient::client(),! $queryString,! array(! 'u' => $username,! 'title' => $content->title,! 'url' => $content->url,! 'tagstr' => $content->tagstr,! 'timestamp' => time(),! 'contentId' => uniqid()! )! );! $result = $query->getResultSet();! ! return self::returnMappedContent($result);! }
Adding Content public static function add($username, Content $content)! {! $queryString =<<<CYPHER! MATCH (user { username: {u}})! OPTIONAL MATCH (user)-[r:LASTPOST]->(lastpost)! DELETE r! CREATE (user)-[:LASTPOST]->(p:Content { title:{title}, url:{url}, tagstr:{tagstr}, timestamp:{timestamp}, contentId: {contentId} })! WITH p, collect(lastpost) as lastposts! FOREACH (x IN lastposts | CREATE p-[:NEXTPOST]->x)! RETURN p, {u} as username, true as owner! CYPHER;! ! $query = new Query(! Neo4jClient::client(),! $queryString,! array(! 'u' => $username,! 'title' => $content->title,! 'url' => $content->url,! 'tagstr' => $content->tagstr,! 'timestamp' => time(),! 'contentId' => uniqid()! )! );! $result = $query->getResultSet();! ! return self::returnMappedContent($result);! }
Adding Content MATCH (user { username: {u}})! OPTIONAL MATCH (user)-[r:LASTPOST]->(lastpost)! DELETE r! CREATE (user)-[:LASTPOST]->(p:Content { title:{title}, url: {url}, tagstr:{tagstr}, timestamp:{timestamp}, contentId: {contentId} })! WITH p, collect(lastpost) as lastposts! FOREACH (x IN lastposts | CREATE p-[:NEXTPOST]->x)! RETURN p, {u} as username, true as owner
Adding Content MATCH (user { username: {u}})! OPTIONAL MATCH (user)-[r:LASTPOST]->(lastpost)! DELETE r! CREATE (user)-[:LASTPOST]->(p:Content { title:{title}, url: {url}, tagstr:{tagstr}, timestamp:{timestamp}, contentId: {contentId} })! WITH p, collect(lastpost) as lastposts! FOREACH (x IN lastposts | CREATE p-[:NEXTPOST]->x)! RETURN p, {u} as username, true as owner
Adding Content MATCH (user { username: {u}})! OPTIONAL MATCH (user)-[r:LASTPOST]->(lastpost)! DELETE r! CREATE (user)-[:LASTPOST]->(p:Content { title:{title}, url: {url}, tagstr:{tagstr}, timestamp:{timestamp}, contentId: {contentId} })! WITH p, collect(lastpost) as lastposts! FOREACH (x IN lastposts | CREATE p-[:NEXTPOST]->x)! RETURN p, {u} as username, true as owner
Adding Content MATCH (user { username: {u}})! OPTIONAL MATCH (user)-[r:LASTPOST]->(lastpost)! DELETE r! CREATE (user)-[:LASTPOST]->(p:Content { title:{title}, url: {url}, tagstr:{tagstr}, timestamp:{timestamp}, contentId: {contentId} })! WITH p, collect(lastpost) as lastposts! FOREACH (x IN lastposts | CREATE p-[:NEXTPOST]->x)! RETURN p, {u} as username, true as owner
Adding Content MATCH (user { username: {u}})! OPTIONAL MATCH (user)-[r:LASTPOST]->(lastpost)! DELETE r! CREATE (user)-[:LASTPOST]->(p:Content { title:{title}, url: {url}, tagstr:{tagstr}, timestamp:{timestamp}, contentId: {contentId} })! WITH p, collect(lastpost) as lastposts! FOREACH (x IN lastposts | CREATE p-[:NEXTPOST]->x)! RETURN p, {u} as username, true as owner
Adding Content MATCH (user { username: {u}})! OPTIONAL MATCH (user)-[r:LASTPOST]->(lastpost)! DELETE r! CREATE (user)-[:LASTPOST]->(p:Content { title:{title}, url: {url}, tagstr:{tagstr}, timestamp:{timestamp}, contentId: {contentId} })! WITH p, collect(lastpost) as lastposts! FOREACH (x IN lastposts | CREATE p-[:NEXTPOST]->x)! RETURN p, {u} as username, true as owner
Adding Content $query = new Query(! $neo4jClient,! $queryString,! array(! 'u' => $username,! 'title' => $content->title,! 'url' => $content->url,! 'tagstr' => $content->tagstr,! 'timestamp' => time(),! 'contentId' => uniqid()! )! );! ! $result = $query->getResultSet();
Retrieving Content public static function getContent($username, $skip)! {! $queryString = <<<CYPHER! MATCH (u:User { username: { u }})-[:FOLLOWS*0..1]->f! WITH DISTINCT f, u! MATCH f-[:LASTPOST]-lp-[:NEXTPOST*0..]-p! RETURN p, f.username as username, f = u as owner! ORDER BY p.timestamp desc SKIP { skip } LIMIT 4! CYPHER;! ! $query = new Query(! Neo4jClient::client(),! $queryString,! array(! 'u' => $username,! 'skip' => $skip,! )! );! ! $result = $query->getResultSet();! ! return self::returnMappedContent($result);! }
Retrieving Content MATCH (u:User { username: { u }})-[:FOLLOWS*0..1]->f! WITH DISTINCT f, u! MATCH f-[:LASTPOST]-lp-[:NEXTPOST*0..]-p! RETURN p, f.username as username, f = u as owner! ORDER BY p.timestamp desc SKIP { skip } LIMIT 4
Retrieving Content MATCH (u:User { username: { u }})-[:FOLLOWS*0..1]->f! WITH DISTINCT f, u! MATCH f-[:LASTPOST]-lp-[:NEXTPOST*0..]-p! RETURN p, f.username as username, f = u as owner! ORDER BY p.timestamp desc SKIP { skip } LIMIT 4
Retrieving Content MATCH (u:User { username: { u }})-[:FOLLOWS*0..1]->f! WITH DISTINCT f, u! MATCH f-[:LASTPOST]-lp-[:NEXTPOST*0..]-p! RETURN p, f.username as username, f = u as owner! ORDER BY p.timestamp desc SKIP { skip } LIMIT 4
Retrieving Content MATCH (u:User { username: { u }})-[:FOLLOWS*0..1]->f! WITH DISTINCT f, u! MATCH f-[:LASTPOST]-lp-[:NEXTPOST*0..]-p! RETURN p, f.username as username, f = u as owner! ORDER BY p.timestamp desc SKIP { skip } LIMIT 4
Retrieving Content MATCH (u:User { username: { u }})-[:FOLLOWS*0..1]->f! WITH DISTINCT f, u! MATCH f-[:LASTPOST]-lp-[:NEXTPOST*0..]-p! RETURN p, f.username as username, f = u as owner! ORDER BY p.timestamp desc SKIP { skip } LIMIT 4
Retrieving Content MATCH (u:User { username: { u }})-[:FOLLOWS*0..1]->f! WITH DISTINCT f, u! MATCH f-[:LASTPOST]-lp-[:NEXTPOST*0..]-p! RETURN p, f.username as username, f = u as owner! ORDER BY p.timestamp desc SKIP { skip } LIMIT 4
Editing Content public static function edit(Content $content)! {! $updatedAt = time();! ! $node = $content->node;! $node->setProperty('title', $content->title);! $node->setProperty('url', $content->url);! $node->setProperty('tagstr', $content->tagstr);! $node->setProperty('updated', $updatedAt);! $node->save();! ! $content->updated = $updatedAt;! ! return $content;! }
Editing Content public static function edit(Content $content)! {! $updatedAt = time();! ! $node = $content->node;! $node->setProperty('title', $content->title);! $node->setProperty('url', $content->url);! $node->setProperty('tagstr', $content->tagstr);! $node->setProperty('updated', $updatedAt);! $node->save();! ! $content->updated = $updatedAt;! ! return $content;! }
Editing Content public static function edit(Content $content)! {! $updatedAt = time();! ! $node = $content->node;! $node->setProperty('title', $content->title);! $node->setProperty('url', $content->url);! $node->setProperty('tagstr', $content->tagstr);! $node->setProperty('updated', $updatedAt);! $node->save();! ! $content->updated = $updatedAt;! ! return $content;! }
Editing Content public static function edit(Content $content)! {! $updatedAt = time();! ! $node = $content->node;! $node->setProperty('title', $content->title);! $node->setProperty('url', $content->url);! $node->setProperty('tagstr', $content->tagstr);! $node->setProperty('updated', $updatedAt);! $node->save();! ! $content->updated = $updatedAt;! ! return $content;! }
Editing Content public static function edit(Content $content)! {! $updatedAt = time();! ! $node = $content->node;! $node->setProperty('title', $content->title);! $node->setProperty('url', $content->url);! $node->setProperty('tagstr', $content->tagstr);! $node->setProperty('updated', $updatedAt);! $node->save();! ! $content->updated = $updatedAt;! ! return $content;! }
Deleting Content public static function delete($username, $contentId)! {! $queryString = self::getDeleteQueryString(! $username, ! $contentId! );! ! $params = array(! 'username' => $username,! 'contentId' => $contentId,! );! ! $query = new Query(! $neo4jClient,! $queryString, ! $params! );! $query->getResultSet();! }
Deleting Content public static function delete($username, $contentId)! {! $queryString = self::getDeleteQueryString(! $username, ! $contentId! );! ! $params = array(! 'username' => $username,! 'contentId' => $contentId,! );! ! $query = new Query(! $neo4jClient,! $queryString, ! $params! );! $query->getResultSet();! }
Deleting Content public static function delete($username, $contentId)! {! $queryString = self::getDeleteQueryString(! $username, ! $contentId! );! ! $params = array(! 'username' => $username,! 'contentId' => $contentId,! );! ! $query = new Query(! $neo4jClient,! $queryString, ! $params! );! $query->getResultSet();! }
Deleting Content public static function delete($username, $contentId)! {! $queryString = self::getDeleteQueryString(! $username, ! $contentId! );! ! $params = array(! 'username' => $username,! 'contentId' => $contentId,! );! ! $query = new Query(! $neo4jClient,! $queryString, ! $params! );! $query->getResultSet();! }
Deleting Content: Leaf // If leaf! MATCH (u:User { username: { username }})-[:LASTPOST| NEXTPOST*0..]->(c:Content { contentId: { contentId }})! WITH c! MATCH (c)-[r]-()! DELETE c, r
Deleting Content: Leaf // If leaf! MATCH (u:User { username: { username }})-[:LASTPOST| NEXTPOST*0..]->(c:Content { contentId: { contentId }})! WITH c! MATCH (c)-[r]-()! DELETE c, r
Deleting Content: Leaf // If leaf! MATCH (u:User { username: { username }})-[:LASTPOST| NEXTPOST*0..]->(c:Content { contentId: { contentId }})! WITH c! MATCH (c)-[r]-()! DELETE c, r
Deleting Content: Leaf // If leaf! MATCH (u:User { username: { username }})-[:LASTPOST| NEXTPOST*0..]->(c:Content { contentId: { contentId }})! WITH c! MATCH (c)-[r]-()! DELETE c, r
Deleting Content: Leaf // If leaf! MATCH (u:User { username: { username }})-[:LASTPOST| NEXTPOST*0..]->(c:Content { contentId: { contentId }})! WITH c! MATCH (c)-[r]-()! DELETE c, r
Deleting Content: LASTPOST // If last! MATCH (u:User { username: { username }})-[lp:LASTPOST]- >(del:Content { contentId: { contentId }})-[np:NEXTPOST]- >(nextPost)! CREATE UNIQUE (u)-[:LASTPOST]->(nextPost)! DELETE lp, del, np
Deleting Content: LASTPOST // If last! MATCH (u:User { username: { username }})-[lp:LASTPOST]- >(del:Content { contentId: { contentId }})-[np:NEXTPOST]- >(nextPost)! CREATE UNIQUE (u)-[:LASTPOST]->(nextPost)! DELETE lp, del, np
Deleting Content: LASTPOST // If last! MATCH (u:User { username: { username }})-[lp:LASTPOST]- >(del:Content { contentId: { contentId }})-[np:NEXTPOST]- >(nextPost)! CREATE UNIQUE (u)-[:LASTPOST]->(nextPost)! DELETE lp, del, np
Deleting Content: LASTPOST // If last! MATCH (u:User { username: { username }})-[lp:LASTPOST]- >(del:Content { contentId: { contentId }})-[np:NEXTPOST]- >(nextPost)! CREATE UNIQUE (u)-[:LASTPOST]->(nextPost)! DELETE lp, del, np
Deleting Content: Other // All other! MATCH (u:User { username: { username }})-[:LASTPOST| NEXTPOST*0..]->(before),! (before)-[delBefore]->(del:Content { contentId: { contentId }})-[delAfter]->(after)! CREATE UNIQUE (before)-[:NEXTPOST]->(after)! DELETE del, delBefore, delAfter
Deleting Content: Other // All other! MATCH (u:User { username: { username }})-[:LASTPOST| NEXTPOST*0..]->(before),! (before)-[delBefore]->(del:Content { contentId: { contentId }})-[delAfter]->(after)! CREATE UNIQUE (before)-[:NEXTPOST]->(after)! DELETE del, delBefore, delAfter
Deleting Content: Other // All other! MATCH (u:User { username: { username }})-[:LASTPOST| NEXTPOST*0..]->(before),! (before)-[delBefore]->(del:Content { contentId: { contentId }})-[delAfter]->(after)! CREATE UNIQUE (before)-[:NEXTPOST]->(after)! DELETE del, delBefore, delAfter
Deleting Content: Other // All other! MATCH (u:User { username: { username }})-[:LASTPOST| NEXTPOST*0..]->(before),! (before)-[delBefore]->(del:Content { contentId: { contentId }})-[delAfter]->(after)! CREATE UNIQUE (before)-[:NEXTPOST]->(after)! DELETE del, delBefore, delAfter
Deleting Content: Other // All other! MATCH (u:User { username: { username }})-[:LASTPOST| NEXTPOST*0..]->(before),! (before)-[delBefore]->(del:Content { contentId: { contentId }})-[delAfter]->(after)! CREATE UNIQUE (before)-[:NEXTPOST]->(after)! DELETE del, delBefore, delAfter
Questions?
Thanks! ! jeremy.kendall@graphstory.com @JeremyKendall http://www.graphstory.com

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Leveraging the Power of Graph Databases in PHP

  • 1.
    Leveraging the Powerof Graph Databases in PHP Jeremy Kendall Nashville PHP November 2014
  • 2.
  • 3.
    Also - NewFather
  • 4.
  • 5.
  • 6.
  • 7.
  • 8.
    Graph Databases • DataModel! • Nodes with properties • Typed relationships
  • 9.
    Graph Databases • DataModel! • Nodes with properties • Typed relationships • Strengths! • Highly connected data • ACID
  • 10.
    Graph Databases • DataModel! • Nodes with properties • Typed relationships • Strengths! • Highly connected data • ACID • Weaknesses! • Paradigm shift
  • 11.
    Graph Databases • DataModel! • Nodes with properties • Typed relationships • Strengths! • Highly connected data • ACID • Weaknesses! • Paradigm shift • Examples! • Neo4j, Titan, OrientDB
  • 12.
  • 13.
    Why Care? • Allthe NoSQL Joy • Schema-less • Semi-structured data
  • 14.
    Why Care? • Allthe NoSQL Joy • Schema-less • Semi-structured data • Escape from JOIN Hell
  • 15.
    Why Care? • Allthe NoSQL Joy • Schema-less • Semi-structured data • Escape from JOIN Hell • Speed
  • 16.
  • 17.
    Why Care? • Relationshipshave 1st class status
  • 18.
    Why Care? • Relationshipshave 1st class status • Just as important as the objects connecting them
  • 19.
    Why Care? • Relationshipshave 1st class status • Just as important as the objects connecting them • You can have properties & labels
  • 20.
    Why Care? • Relationshipshave 1st class status • Just as important as the objects connecting them • You can have properties & labels • Multiple relationships
  • 21.
  • 22.
    Speed Depth MySQL QueryTime Neo4j Query Time Records Returned 2 0.028 (28 MS) 0.04 ~900 3 0.213 0.06 ~999 4 10.273 0.07 ~999 5 92.613 0.07 ~999 1,000 people with an average 50 friends each
  • 23.
    Crazy Speed Depth MySQLQuery Time Neo4j Query Time Records Returned 2 0.016 (16 MS) 0.01 ~2500 3 30.27 0.168 ~125,000 4 1543.505 1.359 ~600,000 5 Stopped after 1 hour 2.132 ~800,000 1,000,000 people with an average 50 friends each
  • 24.
  • 25.
    Cypher • Neo4j’s declarativequery language • Easy to pick up • Some clauses and concepts familiar from SQL
  • 26.
  • 27.
  • 28.
    Create Some Nodes CREATE(jk:Person { name: "Jeremy Kendall" })! CREATE (gs:Company { name: "Graph Story" })! ! CREATE (tn:State { name: "Tennessee" })! CREATE (memphis:City { name: "Memphis" })! CREATE (nashville:City { name: "Nashville" })! ! CREATE (hotchicken:Food { name: "Hot Chicken" })! CREATE (bbq:Food { name: "Barbecue" })! CREATE (photography:Hobby { name: "Photography" })! CREATE (language:Language { name: "PHP" })! ! // . . . snip . . .!
  • 29.
    Create Some Relationships //. . . snip . . .! ! CREATE (jk)-[:WORKS_AT { title: {"CTO"}]->(gs),! (jk)-[:LIVES_IN]->(memphis)-[:LIVED_IN]->(nashville),! (hotchicken)-[:ONLY_IN]->(nashville),! (bbq)-[:ONLY_IN]->(memphis),! (jk)-[:LOVES]->(hotchicken),! ! // . . . snip . . .!
  • 30.
    Create Some Relationships //. . . snip . . .! ! CREATE (jk)-[:WORKS_AT { title: {"CTO"}]->(gs),! (jk)-[:LIVES_IN]->(memphis)-[:LIVED_IN]->(nashville),! (hotchicken)-[:ONLY_IN]->(nashville),! (bbq)-[:ONLY_IN]->(memphis),! (jk)-[:LOVES]->(hotchicken),! ! // . . . snip . . .!
  • 31.
    Create Some Relationships //. . . snip . . .! ! CREATE (jk)-[:WORKS_AT { title: {"CTO"}]->(gs),! (jk)-[:LIVES_IN]->(memphis)-[:LIVED_IN]->(nashville),! (hotchicken)-[:ONLY_IN]->(nashville),! (bbq)-[:ONLY_IN]->(memphis),! (jk)-[:LOVES]->(hotchicken),! ! // . . . snip . . .!
  • 32.
    Create Some Relationships //. . . snip . . .! ! CREATE (jk)-[:WORKS_AT { title: {"CTO"}]->(gs),! (jk)-[:LIVES_IN]->(memphis)-[:LIVED_IN]->(nashville),! (hotchicken)-[:ONLY_IN]->(nashville),! (bbq)-[:ONLY_IN]->(memphis),! (jk)-[:LOVES]->(hotchicken),! ! // . . . snip . . .!
  • 33.
    Example Cypher Query MATCH(p:Person { name: "Jeremy Kendall" })-[:LOVES]->(l)! WITH p, l! MATCH (p)-[:WORKS_AT]->(j)! WITH p, l, j! MATCH (p)-[:LIVES_IN]->(c:City)-[:LIVED_IN*0..]->(o:City)! RETURN p, l, j, o
  • 34.
    Example Cypher Query MATCH(p:Person { name: "Jeremy Kendall" })-[:LOVES]->(l)! WITH p, l! MATCH (p)-[:WORKS_AT]->(j)! WITH p, l, j! MATCH (p)-[:LIVES_IN]->(c:City)-[:LIVED_IN*0..]->(o:City)! RETURN p, l, j, o
  • 35.
    Example Cypher Query MATCH(p:Person { name: "Jeremy Kendall" })-[:LOVES]->(l)! WITH p, l! MATCH (p)-[:WORKS_AT]->(j)! WITH p, l, j! MATCH (p)-[:LIVES_IN]->(c:City)-[:LIVED_IN*0..]->(o:City)! RETURN p, l, j, o
  • 36.
    Example Cypher Query MATCH(p:Person { name: "Jeremy Kendall" })-[:LOVES]->(l)! WITH p, l! MATCH (p)-[:WORKS_AT]->(j)! WITH p, l, j! MATCH (p)-[:LIVES_IN]->(c:City)-[:LIVED_IN*0..]->(o:City)! RETURN p, l, j, o
  • 37.
    Example Cypher Query MATCH(p:Person { name: "Jeremy Kendall" })-[:LOVES]->(l)! WITH p, l! MATCH (p)-[:WORKS_AT]->(j)! WITH p, l, j! MATCH (p)-[:LIVES_IN]->(c:City)-[:LIVED_IN*0..]->(o:City)! RETURN p, l, j, o
  • 38.
    Example Cypher Query MATCH(p:Person { name: "Jeremy Kendall" })-[:LOVES]->(l)! WITH p, l! MATCH (p)-[:WORKS_AT]->(j)! WITH p, l, j! MATCH (p)-[:LIVES_IN]->(c:City)-[:LIVED_IN*0..]->(o:City)! RETURN p, l, j, o
  • 39.
    Example Cypher Query MATCH(p:Person { name: "Jeremy Kendall" })-[:LOVES]->(l)! WITH p, l! MATCH (p)-[:WORKS_AT]->(j)! WITH p, l, j! MATCH (p)-[:LIVES_IN]->(c:City)-[:LIVED_IN*0..]->(o:City)! RETURN p, l, j, o
  • 40.
  • 41.
  • 42.
    Neo4jPHP • PHP wrapperfor the Neo4j REST API • Installable via Composer • Used internally at Graph Story • Used in this presentation • Well tested • https://packagist.org/packages/everyman/ neo4jphp
  • 43.
    Also see: NeoClient •Written by Neoxygen • Alternative PHP wrapper for the Neo4j REST API • Installable via Composer • Under review for internal use at Graph Story • Well tested • https://packagist.org/packages/neoxygen/neoclient
  • 44.
    Connecting $neo4jClient = newEverymanNeo4jClient(! ‘yourgraph.example.com’, ! 7473! );! ! $neo4jClient->getTransport()! ->setAuth('username', 'password')! ->getTransport()->useHttps();
  • 45.
    Creating a Nodeand Label $node = new Node($neo4jClient);! ! $label = $neo4jClient->makeLabel('Person');! ! $node->setProperty('name', ‘Jeremy Kendall');! ! $node->save()->addLabels(array($label));
  • 46.
    Searching // Searching fora label by property! $label = $neo4jClient->makeLabel('Person');! $nodes = $label->getNodes('name', $name);
  • 47.
    Querying (Cypher) $queryString =! 'MATCH (p:Person { name: { name }}) RETURN p';! ! $query = new EverymanNeo4jCypherQuery(! $neo4jClient,! $queryString,! ['name' => ‘Jeremy Kendall']! );! ! $result = $query->getResultSet();
  • 48.
  • 49.
    Named Parameters $queryString =! 'MATCH (p:Person { name: { name }}) RETURN p';! ! $query = new EverymanNeo4jCypherQuery(! $neo4jClient,! $queryString,! ['name' => ‘Jeremy Kendall']! );! ! $result = $query->getResultSet();
  • 50.
    Named Parameters $queryString =! 'MATCH (p:Person { name: { name }}) RETURN p';! ! $query = new EverymanNeo4jCypherQuery(! $neo4jClient,! $queryString,! ['name' => ‘Jeremy Kendall']! );! ! $result = $query->getResultSet();
  • 51.
  • 52.
    News Feed • Modeledas a list of posts • Newest post first • All subsequent posts follow • Relationships: LASTPOST and NEXTPOST
  • 53.
  • 54.
  • 55.
    The Content Model classContent! {! public $node;! public $nodeId;! public $contentId;! public $title;! public $url;! public $tagstr;! public $timestamp;! public $userNameForPost;! public $owner = false;! }
  • 56.
    Adding Content public staticfunction add($username, Content $content)! {! $queryString =<<<CYPHER! MATCH (user { username: {u}})! OPTIONAL MATCH (user)-[r:LASTPOST]->(lastpost)! DELETE r! CREATE (user)-[:LASTPOST]->(p:Content { title:{title}, url:{url}, tagstr:{tagstr}, timestamp:{timestamp}, contentId: {contentId} })! WITH p, collect(lastpost) as lastposts! FOREACH (x IN lastposts | CREATE p-[:NEXTPOST]->x)! RETURN p, {u} as username, true as owner! CYPHER;! ! $query = new Query(! Neo4jClient::client(),! $queryString,! array(! 'u' => $username,! 'title' => $content->title,! 'url' => $content->url,! 'tagstr' => $content->tagstr,! 'timestamp' => time(),! 'contentId' => uniqid()! )! );! $result = $query->getResultSet();! ! return self::returnMappedContent($result);! }
  • 57.
    Adding Content public staticfunction add($username, Content $content)! {! $queryString =<<<CYPHER! MATCH (user { username: {u}})! OPTIONAL MATCH (user)-[r:LASTPOST]->(lastpost)! DELETE r! CREATE (user)-[:LASTPOST]->(p:Content { title:{title}, url:{url}, tagstr:{tagstr}, timestamp:{timestamp}, contentId: {contentId} })! WITH p, collect(lastpost) as lastposts! FOREACH (x IN lastposts | CREATE p-[:NEXTPOST]->x)! RETURN p, {u} as username, true as owner! CYPHER;! ! $query = new Query(! Neo4jClient::client(),! $queryString,! array(! 'u' => $username,! 'title' => $content->title,! 'url' => $content->url,! 'tagstr' => $content->tagstr,! 'timestamp' => time(),! 'contentId' => uniqid()! )! );! $result = $query->getResultSet();! ! return self::returnMappedContent($result);! }
  • 58.
    Adding Content public staticfunction add($username, Content $content)! {! $queryString =<<<CYPHER! MATCH (user { username: {u}})! OPTIONAL MATCH (user)-[r:LASTPOST]->(lastpost)! DELETE r! CREATE (user)-[:LASTPOST]->(p:Content { title:{title}, url:{url}, tagstr:{tagstr}, timestamp:{timestamp}, contentId: {contentId} })! WITH p, collect(lastpost) as lastposts! FOREACH (x IN lastposts | CREATE p-[:NEXTPOST]->x)! RETURN p, {u} as username, true as owner! CYPHER;! ! $query = new Query(! Neo4jClient::client(),! $queryString,! array(! 'u' => $username,! 'title' => $content->title,! 'url' => $content->url,! 'tagstr' => $content->tagstr,! 'timestamp' => time(),! 'contentId' => uniqid()! )! );! $result = $query->getResultSet();! ! return self::returnMappedContent($result);! }
  • 59.
    Adding Content MATCH (user{ username: {u}})! OPTIONAL MATCH (user)-[r:LASTPOST]->(lastpost)! DELETE r! CREATE (user)-[:LASTPOST]->(p:Content { title:{title}, url: {url}, tagstr:{tagstr}, timestamp:{timestamp}, contentId: {contentId} })! WITH p, collect(lastpost) as lastposts! FOREACH (x IN lastposts | CREATE p-[:NEXTPOST]->x)! RETURN p, {u} as username, true as owner
  • 60.
    Adding Content MATCH (user{ username: {u}})! OPTIONAL MATCH (user)-[r:LASTPOST]->(lastpost)! DELETE r! CREATE (user)-[:LASTPOST]->(p:Content { title:{title}, url: {url}, tagstr:{tagstr}, timestamp:{timestamp}, contentId: {contentId} })! WITH p, collect(lastpost) as lastposts! FOREACH (x IN lastposts | CREATE p-[:NEXTPOST]->x)! RETURN p, {u} as username, true as owner
  • 61.
    Adding Content MATCH (user{ username: {u}})! OPTIONAL MATCH (user)-[r:LASTPOST]->(lastpost)! DELETE r! CREATE (user)-[:LASTPOST]->(p:Content { title:{title}, url: {url}, tagstr:{tagstr}, timestamp:{timestamp}, contentId: {contentId} })! WITH p, collect(lastpost) as lastposts! FOREACH (x IN lastposts | CREATE p-[:NEXTPOST]->x)! RETURN p, {u} as username, true as owner
  • 62.
    Adding Content MATCH (user{ username: {u}})! OPTIONAL MATCH (user)-[r:LASTPOST]->(lastpost)! DELETE r! CREATE (user)-[:LASTPOST]->(p:Content { title:{title}, url: {url}, tagstr:{tagstr}, timestamp:{timestamp}, contentId: {contentId} })! WITH p, collect(lastpost) as lastposts! FOREACH (x IN lastposts | CREATE p-[:NEXTPOST]->x)! RETURN p, {u} as username, true as owner
  • 63.
    Adding Content MATCH (user{ username: {u}})! OPTIONAL MATCH (user)-[r:LASTPOST]->(lastpost)! DELETE r! CREATE (user)-[:LASTPOST]->(p:Content { title:{title}, url: {url}, tagstr:{tagstr}, timestamp:{timestamp}, contentId: {contentId} })! WITH p, collect(lastpost) as lastposts! FOREACH (x IN lastposts | CREATE p-[:NEXTPOST]->x)! RETURN p, {u} as username, true as owner
  • 64.
    Adding Content MATCH (user{ username: {u}})! OPTIONAL MATCH (user)-[r:LASTPOST]->(lastpost)! DELETE r! CREATE (user)-[:LASTPOST]->(p:Content { title:{title}, url: {url}, tagstr:{tagstr}, timestamp:{timestamp}, contentId: {contentId} })! WITH p, collect(lastpost) as lastposts! FOREACH (x IN lastposts | CREATE p-[:NEXTPOST]->x)! RETURN p, {u} as username, true as owner
  • 65.
    Adding Content $query =new Query(! $neo4jClient,! $queryString,! array(! 'u' => $username,! 'title' => $content->title,! 'url' => $content->url,! 'tagstr' => $content->tagstr,! 'timestamp' => time(),! 'contentId' => uniqid()! )! );! ! $result = $query->getResultSet();
  • 66.
    Retrieving Content public staticfunction getContent($username, $skip)! {! $queryString = <<<CYPHER! MATCH (u:User { username: { u }})-[:FOLLOWS*0..1]->f! WITH DISTINCT f, u! MATCH f-[:LASTPOST]-lp-[:NEXTPOST*0..]-p! RETURN p, f.username as username, f = u as owner! ORDER BY p.timestamp desc SKIP { skip } LIMIT 4! CYPHER;! ! $query = new Query(! Neo4jClient::client(),! $queryString,! array(! 'u' => $username,! 'skip' => $skip,! )! );! ! $result = $query->getResultSet();! ! return self::returnMappedContent($result);! }
  • 67.
    Retrieving Content MATCH (u:User{ username: { u }})-[:FOLLOWS*0..1]->f! WITH DISTINCT f, u! MATCH f-[:LASTPOST]-lp-[:NEXTPOST*0..]-p! RETURN p, f.username as username, f = u as owner! ORDER BY p.timestamp desc SKIP { skip } LIMIT 4
  • 68.
    Retrieving Content MATCH (u:User{ username: { u }})-[:FOLLOWS*0..1]->f! WITH DISTINCT f, u! MATCH f-[:LASTPOST]-lp-[:NEXTPOST*0..]-p! RETURN p, f.username as username, f = u as owner! ORDER BY p.timestamp desc SKIP { skip } LIMIT 4
  • 69.
    Retrieving Content MATCH (u:User{ username: { u }})-[:FOLLOWS*0..1]->f! WITH DISTINCT f, u! MATCH f-[:LASTPOST]-lp-[:NEXTPOST*0..]-p! RETURN p, f.username as username, f = u as owner! ORDER BY p.timestamp desc SKIP { skip } LIMIT 4
  • 70.
    Retrieving Content MATCH (u:User{ username: { u }})-[:FOLLOWS*0..1]->f! WITH DISTINCT f, u! MATCH f-[:LASTPOST]-lp-[:NEXTPOST*0..]-p! RETURN p, f.username as username, f = u as owner! ORDER BY p.timestamp desc SKIP { skip } LIMIT 4
  • 71.
    Retrieving Content MATCH (u:User{ username: { u }})-[:FOLLOWS*0..1]->f! WITH DISTINCT f, u! MATCH f-[:LASTPOST]-lp-[:NEXTPOST*0..]-p! RETURN p, f.username as username, f = u as owner! ORDER BY p.timestamp desc SKIP { skip } LIMIT 4
  • 72.
    Retrieving Content MATCH (u:User{ username: { u }})-[:FOLLOWS*0..1]->f! WITH DISTINCT f, u! MATCH f-[:LASTPOST]-lp-[:NEXTPOST*0..]-p! RETURN p, f.username as username, f = u as owner! ORDER BY p.timestamp desc SKIP { skip } LIMIT 4
  • 73.
    Editing Content public staticfunction edit(Content $content)! {! $updatedAt = time();! ! $node = $content->node;! $node->setProperty('title', $content->title);! $node->setProperty('url', $content->url);! $node->setProperty('tagstr', $content->tagstr);! $node->setProperty('updated', $updatedAt);! $node->save();! ! $content->updated = $updatedAt;! ! return $content;! }
  • 74.
    Editing Content public staticfunction edit(Content $content)! {! $updatedAt = time();! ! $node = $content->node;! $node->setProperty('title', $content->title);! $node->setProperty('url', $content->url);! $node->setProperty('tagstr', $content->tagstr);! $node->setProperty('updated', $updatedAt);! $node->save();! ! $content->updated = $updatedAt;! ! return $content;! }
  • 75.
    Editing Content public staticfunction edit(Content $content)! {! $updatedAt = time();! ! $node = $content->node;! $node->setProperty('title', $content->title);! $node->setProperty('url', $content->url);! $node->setProperty('tagstr', $content->tagstr);! $node->setProperty('updated', $updatedAt);! $node->save();! ! $content->updated = $updatedAt;! ! return $content;! }
  • 76.
    Editing Content public staticfunction edit(Content $content)! {! $updatedAt = time();! ! $node = $content->node;! $node->setProperty('title', $content->title);! $node->setProperty('url', $content->url);! $node->setProperty('tagstr', $content->tagstr);! $node->setProperty('updated', $updatedAt);! $node->save();! ! $content->updated = $updatedAt;! ! return $content;! }
  • 77.
    Editing Content public staticfunction edit(Content $content)! {! $updatedAt = time();! ! $node = $content->node;! $node->setProperty('title', $content->title);! $node->setProperty('url', $content->url);! $node->setProperty('tagstr', $content->tagstr);! $node->setProperty('updated', $updatedAt);! $node->save();! ! $content->updated = $updatedAt;! ! return $content;! }
  • 78.
    Deleting Content public staticfunction delete($username, $contentId)! {! $queryString = self::getDeleteQueryString(! $username, ! $contentId! );! ! $params = array(! 'username' => $username,! 'contentId' => $contentId,! );! ! $query = new Query(! $neo4jClient,! $queryString, ! $params! );! $query->getResultSet();! }
  • 79.
    Deleting Content public staticfunction delete($username, $contentId)! {! $queryString = self::getDeleteQueryString(! $username, ! $contentId! );! ! $params = array(! 'username' => $username,! 'contentId' => $contentId,! );! ! $query = new Query(! $neo4jClient,! $queryString, ! $params! );! $query->getResultSet();! }
  • 80.
    Deleting Content public staticfunction delete($username, $contentId)! {! $queryString = self::getDeleteQueryString(! $username, ! $contentId! );! ! $params = array(! 'username' => $username,! 'contentId' => $contentId,! );! ! $query = new Query(! $neo4jClient,! $queryString, ! $params! );! $query->getResultSet();! }
  • 81.
    Deleting Content public staticfunction delete($username, $contentId)! {! $queryString = self::getDeleteQueryString(! $username, ! $contentId! );! ! $params = array(! 'username' => $username,! 'contentId' => $contentId,! );! ! $query = new Query(! $neo4jClient,! $queryString, ! $params! );! $query->getResultSet();! }
  • 82.
    Deleting Content: Leaf //If leaf! MATCH (u:User { username: { username }})-[:LASTPOST| NEXTPOST*0..]->(c:Content { contentId: { contentId }})! WITH c! MATCH (c)-[r]-()! DELETE c, r
  • 83.
    Deleting Content: Leaf //If leaf! MATCH (u:User { username: { username }})-[:LASTPOST| NEXTPOST*0..]->(c:Content { contentId: { contentId }})! WITH c! MATCH (c)-[r]-()! DELETE c, r
  • 84.
    Deleting Content: Leaf //If leaf! MATCH (u:User { username: { username }})-[:LASTPOST| NEXTPOST*0..]->(c:Content { contentId: { contentId }})! WITH c! MATCH (c)-[r]-()! DELETE c, r
  • 85.
    Deleting Content: Leaf //If leaf! MATCH (u:User { username: { username }})-[:LASTPOST| NEXTPOST*0..]->(c:Content { contentId: { contentId }})! WITH c! MATCH (c)-[r]-()! DELETE c, r
  • 86.
    Deleting Content: Leaf //If leaf! MATCH (u:User { username: { username }})-[:LASTPOST| NEXTPOST*0..]->(c:Content { contentId: { contentId }})! WITH c! MATCH (c)-[r]-()! DELETE c, r
  • 87.
    Deleting Content: LASTPOST //If last! MATCH (u:User { username: { username }})-[lp:LASTPOST]- >(del:Content { contentId: { contentId }})-[np:NEXTPOST]- >(nextPost)! CREATE UNIQUE (u)-[:LASTPOST]->(nextPost)! DELETE lp, del, np
  • 88.
    Deleting Content: LASTPOST //If last! MATCH (u:User { username: { username }})-[lp:LASTPOST]- >(del:Content { contentId: { contentId }})-[np:NEXTPOST]- >(nextPost)! CREATE UNIQUE (u)-[:LASTPOST]->(nextPost)! DELETE lp, del, np
  • 89.
    Deleting Content: LASTPOST //If last! MATCH (u:User { username: { username }})-[lp:LASTPOST]- >(del:Content { contentId: { contentId }})-[np:NEXTPOST]- >(nextPost)! CREATE UNIQUE (u)-[:LASTPOST]->(nextPost)! DELETE lp, del, np
  • 90.
    Deleting Content: LASTPOST //If last! MATCH (u:User { username: { username }})-[lp:LASTPOST]- >(del:Content { contentId: { contentId }})-[np:NEXTPOST]- >(nextPost)! CREATE UNIQUE (u)-[:LASTPOST]->(nextPost)! DELETE lp, del, np
  • 91.
    Deleting Content: Other //All other! MATCH (u:User { username: { username }})-[:LASTPOST| NEXTPOST*0..]->(before),! (before)-[delBefore]->(del:Content { contentId: { contentId }})-[delAfter]->(after)! CREATE UNIQUE (before)-[:NEXTPOST]->(after)! DELETE del, delBefore, delAfter
  • 92.
    Deleting Content: Other //All other! MATCH (u:User { username: { username }})-[:LASTPOST| NEXTPOST*0..]->(before),! (before)-[delBefore]->(del:Content { contentId: { contentId }})-[delAfter]->(after)! CREATE UNIQUE (before)-[:NEXTPOST]->(after)! DELETE del, delBefore, delAfter
  • 93.
    Deleting Content: Other //All other! MATCH (u:User { username: { username }})-[:LASTPOST| NEXTPOST*0..]->(before),! (before)-[delBefore]->(del:Content { contentId: { contentId }})-[delAfter]->(after)! CREATE UNIQUE (before)-[:NEXTPOST]->(after)! DELETE del, delBefore, delAfter
  • 94.
    Deleting Content: Other //All other! MATCH (u:User { username: { username }})-[:LASTPOST| NEXTPOST*0..]->(before),! (before)-[delBefore]->(del:Content { contentId: { contentId }})-[delAfter]->(after)! CREATE UNIQUE (before)-[:NEXTPOST]->(after)! DELETE del, delBefore, delAfter
  • 95.
    Deleting Content: Other //All other! MATCH (u:User { username: { username }})-[:LASTPOST| NEXTPOST*0..]->(before),! (before)-[delBefore]->(del:Content { contentId: { contentId }})-[delAfter]->(after)! CREATE UNIQUE (before)-[:NEXTPOST]->(after)! DELETE del, delBefore, delAfter
  • 96.
  • 97.