Stored Procedure to find unique nodes.
This project requires Neo4j 3.2.x
This project uses maven, to build a jar-file with the procedure in this project, simply package the project with maven:
mvn clean package
This will produce a jar-file, target/matcher-1.0-SNAPSHOT.jar,
that can be copied to the plugin directory of your Neo4j instance.
cp target/unique-1.0-SNAPSHOT.jar neo4j-enterprise-3.2.3/plugins/.
Edit your Neo4j/conf/neo4j.conf file by adding this line:
dbms.security.procedures.unrestricted=com.maxdemarzi.*
Restart your Neo4j Server.
Create the Schema by running this stored procedure:
CALL com.maxdemarzi.schema.generate
Let's create some test data. First the root of our traversal:
CREATE (u:PRODUCT {id:"1-Root"})
Next we will create a few layers of non PRODUCT labeled nodes:
WITH ["PlayStation","Lipitor","Corolla","Star Wars","iPad","Mario Bros. Franchise","Michael Jackson’s Thriller","Harry Potter",
"iPhone","Rubik’s Cube"] AS products
MATCH (product:PRODUCT) WHERE product.id STARTS WITH "1-"
WITH range(1,2) as children, product, products
FOREACH (id in children | CREATE (product)-[:NEEDS]->(:Item {id:"2-" +
products[id% size(products)]+id(product)}) );
WITH ["PlayStation","Lipitor","Corolla","Star Wars","iPad","Mario Bros. Franchise","Michael Jackson’s Thriller","Harry Potter",
"iPhone","Rubik’s Cube"] AS products
MATCH (item:Item) WHERE item.id STARTS WITH "2-"
WITH range(1,2) as children, item, products
FOREACH (id in children | CREATE (item)-[:NEEDS]->(:Item {id:"3-" +
products[id% size(products)]+id(item)}) );
WITH ["PlayStation","Lipitor","Corolla","Star Wars","iPad","Mario Bros. Franchise","Michael Jackson’s Thriller","Harry Potter",
"iPhone","Rubik’s Cube"] AS products
MATCH (item:Item) WHERE item.id STARTS WITH "3-"
WITH range(1,2) as children, item, products
FOREACH (id in children | CREATE (item)-[:NEEDS]->(:Item {id:"4-" +
products[id% size(products)]+id(item)}) );
Finally we will create the PRODUCT labeled nodes:
WITH ["PlayStation","Lipitor","Corolla","Star Wars","iPad","Mario Bros. Franchise","Michael Jackson’s Thriller","Harry Potter",
"iPhone","Rubik’s Cube"] AS products
MATCH (item:Item) WHERE item.id STARTS WITH "4-"
WITH range(1,2) as children, item, products
FOREACH (id in children | CREATE (item)-[:NEEDS]->(:PRODUCT {id:"5-" +
products[id% size(products)]+id(item)}) );
Now call the stored procedure:
CALL com.maxdemarzi.unique('1-Root') yield node return node.id
Try the alternate Cypher query:
MATCH (p:PRODUCT {id: "1-Root"})-[:NEEDS*..10000]->(d:PRODUCT)
RETURN distinct d.id;
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