CODEWITHSUNDEEP
neo4jcyphergraph-databases
mbreton
mbreton

Reputation: 684

How to create and retrieve a node by its label in Neo4j 2.0.0M5

My problem is really a basic example of using labels in Neo4j 2.0.M5. I try to drop all nodes and relationships, then I drop old 'Person' index, then I create a new 'Person' index based on 'name' property, then I create a node labeled 'Person' with name 'John Doe', to finally retrieve this node.

Cypher:

START n=node(*) MATCH n-[r?]-m  WITH n, r DELETE n, r
DROP INDEX ON :Person(name)
CREATE INDEX ON :Person(name)
CREATE (n:Person {name:'Jhon Doe'})
start n=node:Person(name='Jhon Doe') return n

All works well, except at the end, when I try to retrieve my node. Neo4j throws an error :

Index `Person` does not exist

I try without creating the index, but it also doesn't work.

It's a really simple case, do you see the problem ?

Upvotes: 2

Views: 318

Answers (1)

David Makogon
David Makogon

Reputation: 71023

For Neo4j 2.0, start is no longer necessary, and your query can be expressed as:

match (n:Person)
where n.name='Jhon Doe'
return n;

With the start syntax, you're specifying an index name. With v2.0, when creating an index based on a label, I don't believe the index can be referenced by name (as it's never been given a name; you've just told Neo4j to index nodes with the label Person based on the property name). Since there's no index called Person, this is probably why you're seeing that error.

Upvotes: 3

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