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https://github.com/mumez/scyphergraph
Object wrapper of Neo4j graph database using SmallBolt and SCypher
https://github.com/mumez/scyphergraph
neo4j neo4j-graph-database pharo pharo-smalltalk
Last synced: 3 months ago
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Object wrapper of Neo4j graph database using SmallBolt and SCypher
- Host: GitHub
- URL: https://github.com/mumez/scyphergraph
- Owner: mumez
- License: mit
- Created: 2020-10-10T14:48:17.000Z (over 4 years ago)
- Default Branch: main
- Last Pushed: 2022-02-06T13:15:36.000Z (almost 3 years ago)
- Last Synced: 2024-09-25T21:40:54.035Z (4 months ago)
- Topics: neo4j, neo4j-graph-database, pharo, pharo-smalltalk
- Language: Smalltalk
- Homepage:
- Size: 77.1 KB
- Stars: 6
- Watchers: 3
- Forks: 1
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
- License: LICENSE
Awesome Lists containing this project
README
# SCypherGraph
High-level object wrapper of [Neo4j](https://neo4j.com/) graph database using [SmallBolt](https://github.com/mumez/SmallBolt) and [SCypher](https://github.com/mumez/SCypher)
# Installation
Currently Pharo 8 and Pharo 9 are supported.
```smalltalk
Metacello new
baseline: 'SCypherGraph';
repository: 'github://mumez/SCypherGraph:main/src';
load.
```
# Examples
Please see [Interacting with Neo4j from Pharo Smalltalk](https://hashnode.com/post/interacting-with-neo4j-from-pharo-smalltalk-ckltglsqq085o10s14bkhfhke) for details.
## Basic
```smalltalk
db := SgGraphDb default.
db settings username: 'neo4j'; password: 'neoneo'.
db allLabels. "Get all node labels"
"Print 'Movie' node properties"
(db nodesLabeled: 'Movie')
do: [ :each | self traceCr: each properties ].
```
## Get node with where:
```smalltalk
matrix := (db nodesLabeled: 'Movie' where: [:each | each @ 'title' = 'The Matrix']) first.
matrix properties.
```
## Get relationships
```smalltalk
matrix inRelationships.
matrix outRelationships.
(matrix inRelationshipsTyped: 'ACTED_IN')
collect: [:each | each endNode @ 'name'].
```
## Get relationships with where:
```smalltalk
(matrix inRelationshipsTyped: 'ACTED_IN' where: [ :start :rel :end | (rel @ 'roles') = #('Neo') ])
collect: [ :each | each endNode properties ].
```
## Create nodes
```smalltalk
sf := db mergeNodeLabeled: 'Genre' properties: {'name'->'SF'. 'description'->'Science Fiction'}.
action := db mergeNodeLabeled: 'Genre' properties: {'name'->'Action'. 'description'->'Exciting Actions'}.
```
## Create relationships
```smalltalk
matrixToSf := matrix relateOneTo: sf typed: 'HAS_GENRE' properties: {'score'-> 6}.
matrixToAction := matrix relateTo: action typed: 'HAS_GENRE' properties: {'score'-> 7}.
```
## Execute Cypher directly
```smalltalk
db runCypher: 'UNWIND range(1, 10) AS n RETURN n*n'. "inspect it"
db runCypher: 'UNWIND range($from, $to) AS n RETURN n*n'
arguments: {'from'->2. 'to'->5}. "inspect it"
```
## Execute dynamically generated Cypher
```smalltalk
m := 'm' asCypherObject. "Movie"
p := 'p' asCypherObject. "Person"
o := 'o' asCypherObject. "Other person"
pathPattern := (p node: 'Person') - ('act1' asCypherObject rel: 'ACTED_IN' ) -> (m node: 'Movie' props: {'released'->2000}) <- ('act2' asCypherObject rel: 'ACTED_IN' ) - (o node: 'Person').
actorNameParam := 'actorName' asCypherParameter.
where := (p @ 'name') starts: actorNameParam.
"where := ((p @ 'born') > 1970) and: ((o @ 'born') > 1970). " " <= try changing"
return := (p @ 'name'), (o @ 'name'), (m @ 'title').
query := CyQuery match: pathPattern where: where return: return orderBy: (p @ 'name') skip: 0 limit: 100. "print it"
result := db runCypher: query arguments: { actorNameParam -> 'Tom' }.
(result fieldValues groupedBy: [ :each | each at: 1 ]). "inspect it"
```
## Changing IP and port
```smalltalk
db settings targetUri: 'bolt://127.0.0.1:7687'.
```