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 | This is a legacy strategy to migrate from Neo4j. The new strategy is to migrate using the Neo4j to OrientDB Importer. |
Tutorial: Importing the movie Database from Neo4j
In this tutorial we will follow the steps described in the Import from Neo4j using GraphML section to import the Neo4j's movie example database into OrientDB.
We will also provide some examples of queries using the OrientDB's MATCH syntax, making a comparison with the corresponding Neo4j's Cypher query language.
For general information on the possible Neo4j to OrientDB migration strategies, please refer to the Import from Neo4j section.
Neo4j and Cypher are registered trademark of Neo Technology, Inc.
Exporting from Neo4j
Assuming you have already downloaded and unpacked the Neo4j Shell Tools, and restarted the Neo4j Server, as described in the Section Exporting GraphML, you can export the movie database using neo4j-shell with a command like the following one:
D:\neo4j\neo4j-community-3.0.6\bin>neo4j-shell.bat
Welcome to the Neo4j Shell! Enter 'help' for a list of commands
NOTE: Remote Neo4j graph database service 'shell' at port 1337
neo4j-sh (?)$ export-graphml -t -o d:/movie.graphml
Wrote to GraphML-file d:/movies.graphml 0. 100%: nodes = 171 rels = 253 properties = 564 time 270 ms total 270 ms
In the example above the exported movie graph is stored under D:\movie.graphml.
Importing into OrientDB
In this tutorial we will import in OrientDB the file movie.graphml using the OrientDB's Console. For other GraphML import methods, please refer to the section Importing GraphML.
The OrientDB's Console output generated during the import process is similar to the following (note that first we create a movie database using the command CREATE DATABASE, and then we do the actual import using the command IMPORT DATABASE):
D:\orientdb\orientdb-enterprise-2.2.8\bin>console.bat
OrientDB console v.2.2.8-SNAPSHOT (build 2.2.x@r39259e190e16045fe1425b1c0485f8562fca055b; 2016-08-23 14:38:49+0000) www.orientdb.com
Type 'help' to display all the supported commands.
Installing extensions for GREMLIN language v.2.6.0
orientdb> CREATE DATABASE PLOCAL:D:/orientdb/orientdb-enterprise-2.2.8/databases/movie
Creating database [PLOCAL:D:/orientdb/orientdb-enterprise-2.2.8/databases/movie] using the storage type [PLOCAL]...
Database created successfully.
Current database is: PLOCAL:D:/orientdb/orientdb-enterprise-2.2.8/databases/movie
orientdb {db=movie}> IMPORT DATABASE D:/movie.graphml
Importing GRAPHML database from D:/movie.graphml with options ()...
Done: imported 171 vertices and 253 edges
orientdb {db=movie}>
As you can see from the output above, as a result of the import 171 vertices and 253 edges have been created in OrientDB. This is exactly the same number of nodes and relationships exported from Neo4j.
For more tips and tricks related to the import process, please refer to this section.
Query Comparison
Once the movie database has been imported into OrientDB, you may use several ways to access its data.
The MATCH syntax and the tool Studio can be used, for instance, in a similar way to the Neo4j's Cypher and Browser.
The following sections include a comparison of the Neo4j's Cypher and OrientDB's MATCH syntax for some queries that you can execute against the movie database.
Find the actor named "Tom Hanks"
Neo4j's Cypher:
MATCH (tom:Person {name: "Tom Hanks"})
RETURN tom
OrientDB's MATCH:
MATCH {class: Person, as: tom, where: (name = 'Tom Hanks')}
RETURN $pathElements
Find the movie with title "Cloud Atlas"
Neo4j's Cypher:
MATCH (cloudAtlas:Movie {title: "Cloud Atlas"})
RETURN cloudAtlas
OrientDB's MATCH:
MATCH {class: Movie, as: cloudAtlas, where: (title = 'Cloud Atlas')}
RETURN $pathElements
Find 10 people
Neo4j's Cypher:
MATCH (people:Person)
RETURN people.name
LIMIT 10
OrientDB's MATCH:
MATCH {class: Person, as: people}
RETURN people.name
LIMIT 10
Find the movies released in the 1990s
Neo4j's Cypher:
MATCH (nineties:Movie)
WHERE nineties.released > 1990 AND nineties.released < 2000
RETURN nineties.title
OrientDB's MATCH:
MATCH {class: Movie, as: nineties, WHERE: (released > 1990 AND released < 2000 )}
RETURN nineties.title
List all Tom Hanks movies
Neo4j's Cypher:
MATCH (tom:Person {name: "Tom Hanks"})-[:ACTED_IN]->(tomHanksMovies)
RETURN tom, tomHanksMovies
OrientDB's MATCH:
MATCH {class: Person, as: tom, where: (name = 'Tom Hanks')}-ACTED_IN->{as: tomHanksMovies}
RETURN $pathElements
Find out who directed "Cloud Atlas"
Neo4j's Cypher:
MATCH (cloudAtlas {title: "Cloud Atlas"})<-[:DIRECTED]-(directors)
RETURN directors.name
OrientDB's MATCH:
MATCH {class: Movie, as: cloudAtlas, where: (title = 'Cloud Atlas')}<-DIRECTED-{as: directors}
RETURN directors.name
Find Tom Hanks' co-actors
Neo4j's Cypher:
MATCH (tom:Person {name:"Tom Hanks"})-[:ACTED_IN]->(m)<-[:ACTED_IN]-(coActors)
RETURN DISTINCT coActors.name
OrientDB's MATCH:
MATCH {class: Person, as: tom, where: (name = 'Tom Hanks')}-ACTED_IN->{as: m}<-ACTED_IN-{class: Person,as: coActors}
RETURN coActors.name
Find how people are related to "Cloud Atlas"
Neo4j's Cypher:
MATCH (people:Person)-[relatedTo]-(:Movie {title: "Cloud Atlas"})
RETURN people.name, Type(relatedTo), relatedTo
OrientDB's MATCH:
MATCH {class: Person, as: people}--{as: m, where: (title = 'Cloud Atlas')}
RETURN $pathElements