CODEWITHSUNDEEP
neo4jindexing
garey
garey

Reputation: 67

reusing indexes that have already been created

I am using Neo4J from a Java Servlet. I have code that initializes the database, creates some indexes, and declares some UniqueNodeFactories.

When I restart the Servlet, how do I check whether an index has already been created and get a reference to it if it has? How do I do the same thing with UniqueNodeFactories?

Upvotes: 0

Views: 68

Answers (1)

Luanne
Luanne

Reputation: 19373

To get a reference to an index, you can use:

IndexManager index = graphDb.index();
Index<Node> actors = index.forNodes( "actors" );

forNodes will create the index if it does not already exist.

Instead, if you just want to check existence of an index, you can use:

index.existsForNodes( "actors" );

I believe the same applies to the UniqueNodeFactory (it is returned or created if it does not exist):

UniqueFactory<Node> factory = new UniqueFactory.UniqueNodeFactory( graphDb, "actors" )

Upvotes: 1

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