Neo4J Playground
Neo4j Graph Database is native graph database that is built to store and retrieve connected data.
Nodes are the entities in the graph.
- Nodes can be tagged with labels, representing their different roles in your domain (for example, Person).
- Nodes can hold any number of key-value pairs, or properties (for example, name).
- Node labels may also attach metadata (such as index or constraint information) to certain nodes.
Relationships provide directed, named connections between two node entities (for example, Person LOVES Person).
- Relationships always have a direction, a type, a start node, and an end node, and they can have properties, just like nodes.
- Nodes can have any number or type of relationships without sacrificing performance.
- Although relationships are always directed, they can be navigated efficiently in any direction.
Cypher QL
Cypher, a declarative query language similar to SQL, but optimized for graphs. Now used by other databases like SAP HANA Graph and Redis graph via the openCypher project.
Running this playground code
docker-compose -f ./docker-compose.yml up -d
./bash.sh # Bash to container# Import data
root@008cd5ac7715:/var/www/html# composer install
root@008cd5ac7715:/var/www/html# ./app/index.php --import
docker-compose -f ./docker-compose.yml up -dThe Browser tool is available here http://0.0.0.0:7474/browser/
Schema
Queries
# Groups in common between 2 users based on the comment thread they voted on
MATCH (u1:User{userId: 366265})-[v1:VOTE_UP]->(t:Thread)-[i:IS_IN]->(g:Group),
(u2:User{userId:1})-[v2:VOTE_UP]->(t:Thread)
RETURN g
LIMIT 100;
# All Threads/Groups user commented on
MATCH (u:User{userId: 1})-[:POST]->(c:Comment)-[:IS_ON]->(t:Thread)-[:IS_IN]->(g:Group)
RETURN u,c,t,g;
Recommend a Thread based on common groups
MATCH (t:Thread) WHERE t.threadId = 1255065
MATCH (t)-[:IS_IN]->(g:Group)<-[:IS_IN]-(rec:Thread)
WITH t, rec, COUNT(*) AS groupScore
RETURN rec.name AS recommendation, groupScore AS score
ORDER BY score DESC LIMIT 100
╒══════════════════════════════════════════════════════════════════════╤═══════╕
│"recommendation" │"score"│
╞══════════════════════════════════════════════════════════════════════╪═══════╡
│"Bon d'achat de 5€ à valoir dans les centres commerciaux La Galerie - │2 │
│jeu 100% gagnant (via l'application)" │ │
├──────────────────────────────────────────────────────────────────────┼───────┤
│"Miroir de Poche en forme de biscuit (vendeur tiers)" │2 │
├──────────────────────────────────────────────────────────────────────┼───────┤
│"Sélection d'articles en soldes - Ex: Diffuseur de Parfum Reflets Arge│2 │
│ntés" │ │
├──────────────────────────────────────────────────────────────────────┼───────┤
│"Codes promos CDISCOUNT via l'application de 25€ pour 249€ d'achat et │2 │
│10€ pour 99€ d'achat."
.......
Similar Threads (common groups) to the one User:1 votes up
MATCH (u:User{userId: 1})-[v:VOTE_UP]->(t:Thread),
(t)-[:IS_IN]->(g:Group)<-[:IS_IN]-(t2:Thread)
WHERE NOT EXISTS( (u)-[:VOTE_UP]->(t2) )
WITH t2, COLLECT(g.name) AS groups, COUNT(*) AS commonGroups
RETURN t2.name, groups, commonGroups
ORDER BY commonGroups DESC LIMIT 10;
╒══════════════════════════════════════════════════════════════════════╤══════════════════════════════════════════════════════════════════════╤══════════════╕
│"t2.name" │"groups" │"commonGroups"│
╞══════════════════════════════════════════════════════════════════════╪══════════════════════════════════════════════════════════════════════╪══════════════╡
│"6€ offerts pour l'achat de 30€ de chèques-cadeaux" │["Services","Culture & divertissement","Sports & plein air","Mode & ac│19 │
│ │cessoires","Services","Santé & Cosmétiques","Mode & accessoires","Imag│ │
│ │e, son & vidéo","Culture & divertissement","Consoles & jeux vidéo","Im│ │
│ │age, son & vidéo","Culture & divertissement","Mode & accessoires","Mod│ │
│ │e & accessoires","Mode & accessoires","Services","Sports & plein air",│ │
│ │"Mode & accessoires","Services"] │ │
├──────────────────────────────────────────────────────────────────────┼──────────────────────────────────────────────────────────────────────┼──────────────┤
│"Recevez un code promotionnel de 5€ en rechargeant votre compte Amazon│["Services","Culture & divertissement","Sports & plein air","Mode & ac│18 │
│.fr de 60€" │cessoires","Services","Mode & accessoires","Image, son & vidéo","Cultu│ │
│ │re & divertissement","Consoles & jeux vidéo","Image, son & vidéo","Cul│ │
│ │ture & divertissement","Mode & accessoires","Mode & accessoires","Mode│ │
│ │ & accessoires","Services","Sports & plein air","Mode & accessoires","│ │
│ │Services"] │ │
├──────────────────────────────────────────────────────────────────────┼──────────────────────────────────────────────────────────────────────┼──────────────┤
│"Bon d'achat de 5€ à valoir dans les centres commerciaux La Galerie - │["Services","Culture & divertissement","Mode & accessoires","Services"│14 │
│jeu 100% gagnant (via l'application)" │,"Santé & Cosmétiques","Mode & accessoires","Culture & divertissement"│ │
│ │,"Culture & divertissement","Mode & accessoires","Mode & accessoires",│ │
│ │"Mode & accessoires","Services","Mode & accessoires","Services"] │ │
├──────────────────────────────────────────────────────────────────────┼──────────────────────────────────────────────────────────────────────┼──────────────┤
│"Codes promos CDISCOUNT via l'application de 25€ pour 249€ d'achat et │["Culture & divertissement","Mode & accessoires","Santé & Cosmétiques"│13 │
│10€ pour 99€ d'achat." │,"Mode & accessoires","Image, son & vidéo","Culture & divertissement",│ │
│ │"Consoles & jeux vidéo","Image, son & vidéo","Culture & divertissement│ │
│ │","Mode & accessoires","Mode & accessoires","Mode & accessoires","Mode│ │
│ │ & accessoires"] │ │
├──────────────────────────────────────────────────────────────────────┼──────────────────────────────────────────────────────────────────────┼──────────────┤
│"Sélection d'articles en soldes - Ex: Diffuseur de Parfum Reflets Arge│["Culture & divertissement","Sports & plein air","Mode & accessoires",│12 │
│ntés" │"Santé & Cosmétiques","Mode & accessoires","Culture & divertissement",│ │
│ │"Culture & divertissement","Mode & accessoires","Mode & accessoires","│ │
│ │Mode & accessoires","Sports & plein air","Mode & accessoires"] │ │
├──────────────────────────────────────────────────────────────────────┼──────────────────────────────────────────────────────────────────────┼──────────────┤
│"Nettoyage à sec d'un costume 2 pièces (retiré et livré à domicile/bur│["Services","Mode & accessoires","Services","Mode & accessoires","Mode│10 │
│eau en 48H)" │ & accessoires","Mode & accessoires","Mode & accessoires","Services","│ │
│ │Mode & accessoires","Services"] │ │
├──────────────────────────────────────────────────────────────────────┼──────────────────────────────────────────────────────────────────────┼──────────────┤
│"10% supplémentaires sur les soldes à partir de 3 articles achetés + L│["Services","Mode & accessoires","Services","Mode & accessoires","Mode│10 │
│ivraison offerte dès 60€ d'achat (noukies.com)" │ & accessoires","Mode & accessoires","Mode & accessoires","Services","│ │
│ │Mode & accessoires","Services"] │ │
├──────────────────────────────────────────────────────────────────────┼──────────────────────────────────────────────────────────────────────┼──────────────┤
│"Bracelet connecté Samsung Gear Fit 2 Pro (Noir/Rouge, Taille L) + Éco│["Sports & plein air","Mode & accessoires","Mode & accessoires","Image│10 │
│uteurs Bluetooth JBL Inspire 500 (via ODR de 50€)" │, son & vidéo","Image, son & vidéo","Mode & accessoires","Mode & acces│ │
│ │soires","Mode & accessoires","Sports & plein air","Mode & accessoires"│ │
│ │] │ │
├──────────────────────────────────────────────────────────────────────┼──────────────────────────────────────────────────────────────────────┼──────────────┤
│"VIBOX PC Gamer - Venom GL780T-43 Package - 4.5GHz Intel Quad Core (2x│["Mode & accessoires","Mode & accessoires","Image, son & vidéo","Conso│9 │
│ Dual SLI Nvidia GeForce GTX 1080Ti 11 Go, 32 Go 3000MHz RAM, SSD 240 │les & jeux vidéo","Image, son & vidéo","Mode & accessoires","Mode & ac│ │
│Go, 4 To, 3x Triple Écran 24" DELL, Casque Gamer, Razer Clavier, Razer│cessoires","Mode & accessoires","Mode & accessoires"] │ │
│ Souris, Windows 10)" │ │ │
├──────────────────────────────────────────────────────────────────────┼──────────────────────────────────────────────────────────────────────┼──────────────┤
│"Carte graphique" │["High-Tech","High-Tech","High-Tech","High-Tech","High-Tech","High-Tec│9 │
│ │h","High-Tech","High-Tech","High-Tech"] │ │
└──────────────────────────────────────────────────────────────────────┴──────────────────────────────────────────────────────────────────────┴──────────────┘
....
Weakly Connected Components
The Weakly Connected Components (WCC) algorithm finds sets of connected nodes in directed and undirected graphs. Two nodes are connected, if there exists a path between them.
CALL gds.graph.project.cypher(
'usersCommentsThreadsProjection',
'MATCH (u:User) RETURN id(u) AS id',
'MATCH (u1:User)-[c1:COMMENT]->(t:Thread)<-[c2:COMMENT]-(u2:User) RETURN id(u1) AS source, id(u2) as target'
);
CALL gds.wcc.write('usersCommentsThreadsProjection', {writeProperty: 'everythingComponentId'})
YIELD nodePropertiesWritten, componentCount;
MATCH (u:User)
WITH u.everythingComponentId AS component, COUNT(*) AS number
RETURN component, number
ORDER BY number DESC
LIMIT 20;
MATCH (u:User)-[r]->(n)
WHERE u.everythingComponentId=708
RETURN u,r,n
LIMIT 20;
React
Typescript
Django
Laravel
Facebook
Microsoft
Google
Alibaba
D3
Tencent