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

Question

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 ?

David Makogon David Makogon · Accepted Answer · 2013-10-10T12:12:53

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.

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

1 Answers