Is it possible to use the OGM library with one embedded server ?
The examples I have seen so for the session is always obtain via remote http connection to the neo4j server.
I would like to have the elegant programming model of the OGM library without the having the make network IO to the database.
Thank you, kindly
Oscar
The current release of the OGM (1.1.4) supports only the Neo4j remote server.
OGM 2.0 will provide support for Neo4j remote server (http) and embedded Neo4j. Once Neo4j 3.0 is released, OGM 2.x will support the new binary (Bolt) protocol as well.
The first milestone of OGM 2.0 is expected within the next two weeks.
Related
We have one application built using Neo4j 3.0.4 embedded db. This application is responsible to build Graph.
We have another application built using Spring Data Neo4j 4.1. This application is responsible to get the Graph db data for UI.
As we do not have the capability of using traversal API in SDN4, Is there any possibility to use native Neo4j Java API in SDN4 application?
How can we do that?
There is an embedded driver for neo4j-ogm which SDN is built on, the SDN and OGM docs have examples on how to use it.
http://docs.spring.io/spring-data/data-neo4j/docs/4.2.0.RELEASE/reference/html/#reference:configuration:driver:embedded
You can expose your Neo4j embedded application through the bolt interface (This might be 3.1+ only).
You can then start your SDN application in a separate JVM and connect to your embedded instance using the bolt driver.
Otherwise it is not possible to use an embedded instance controlled by another main and SDN embedded together.
Currently, there are two SDN releases:
Spring Data Neo4j 3.4.0.RELEASE
Spring Data Neo4j 4.0.0.RELEASE
Spring Data Neo4J
What is the point to have them both?
Which one should I use in my application ?
Spring Data Neo4j 4 is the newest version, a complete rewrite from scratch focussing on Neo4j server, see also:
http://neo4j.com/developer/spring-data-neo4j/
It builds on top of a pure Java OGM which uses the server transport and will use the binary protocol in the future.
There are migration notes for people coming from SDN 3
If you are starting a new project go with SDN4
I am developing a social networking website with Grails and MYSQL DB. But I am planning to move to Neo4j DB. Grails supports complete GORM features with MYSQL. But I am sure about the same features in Neo4j. There is a Grails plugin for Neo4j which does not support some of the features that is required to support big websites. So I am planning to use the native Neo4j API. From Grails how to connect to Neo4j DB? There are two scenarios in my case.
Case 1:
Neo4j server is up and running. How to connect and perform the database transactions?
Case 2:
Neo4j server is not running. How to connect and perform the database transactions? I was able to connect using GraphDatabaseService class. But why would one need to connect to DB which is not running. What is this class GraphDatabaseService particularly used for?
I want to use the native Neo4j API to get access to maximum features. Is there a better approach to build the application.
The Grails Neo4j GORM plugin in version 2.0.0.M01 is able to run embedded mode only - so the JVM running the Grails applications spawns the database inside the same JVM. Next milestone (M02) will add support for accessing Neo4j via REST.
In case you don't want to transparently use the GORM methods to talk to Neo4j you can always use direct access by emitting Cypher statements or accessing GraphDatabaseService directly (only on embedded mode of course).
How to connect to neo4j server in spring via rmi? I found http://mvnrepository.com/artifact/org.neo4j/neo4j-remote-graphdb. Is it component neo4j-remote-graphdb supported?
You can connect with that library, which is also in http://github.com/neo4j/java-rest-binding
But you shouldn't use individual operations over the wire for higher performance operations, use Cypher instead (using RestGraphDatabase.query(query, params)) with Cypher Parameters.
I am using spring-data-neo4j to access the Neo4j database. I want to enable REST streaming for improving the performance of my Neo4j interactions.
Can anyone please guide me on how to leverage streaming via spring-data-neo4j? i.e. How do I tell spring data to send the 'stream=true' header in every REST request to the Neo4j server?
It is already enabled by default.
You can control it by the System property: org.neo4j.rest.stream=true
https://github.com/neo4j/java-rest-binding#configuration-system-properties