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GraphFusion

Your first graph

This example creates Alice → Bob → Cara, then finds Alice’s friend of a friend. Run it from a source checkout after building the CLI.

Create and query a graph

Section titled “Create and query a graph”

Save the following as first-graph.gql:

CREATE GRAPH social ANY GRAPH;
SESSION SET GRAPH social;


INSERT (alice:Person {name: 'Alice', age: 30})-[:Knows]->
       (bob:Person {name: 'Bob', age: 40})-[:Knows]->
       (cara:Person {name: 'Cara', age: 25});


MATCH (a:Person {name: 'Alice'})-[:Knows]->(b)-[:Knows]->(c)
RETURN c.name AS friend;
Terminal window
cargo run -p graphfusion --locked -- run --file first-graph.gql

The final table contains friend = Cara. The program runs in memory and its database disappears when the process exits. ANY GRAPH creates an open graph: you can introduce labels and properties without declaring a graph type first.

Keep data between runs

Section titled “Keep data between runs”

Use a new database directory:

Terminal window
cargo run -p graphfusion --locked -- run \
  --database ./demo-db --create --file first-graph.gql
cargo run -p graphfusion --locked -- run --database ./demo-db \
  --query "USE GRAPH social MATCH (p:Person) RETURN p.name AS name ORDER BY name"

The second process reopens the graph and returns Alice, Bob and Cara. Session settings do not persist between processes, so the query selects social again with USE GRAPH.

Do not rerun the create program against the same directory unchanged: CREATE GRAPH social will find an existing graph. Reopen the directory to query it, or use a different directory to repeat the tutorial.

Change a property

Section titled “Change a property”
MATCH (p:Person {name: 'Alice'})
SET p.age = p.age + 1
RETURN p.name AS name, p.age AS age;

This returns Alice and 31. INSERT, SET and DELETE explain how statements publish changes.

Continue

Section titled “Continue”