Neo4j动态关系类型，不使用枚举

Question

如何将字符串“KNOWS”用作关系类型而不是使用枚举RelTypes.KNOWS...我需要动态添加关系，而不仅仅使用2个枚举RelTypes.KNOWS和RelTypes.IS_FRIENDS_WITH。

// START SNIPPET: createReltype
private static enum RelTypes implements RelationshipType
{
    KNOWS,
    IS_FRIENDS_WITH
}
// END SNIPPET: createReltype

public static void main( final String[] args )
{
    // START SNIPPET: startDb
    GraphDatabaseService graphDb = new EmbeddedGraphDatabase( DB_PATH );
    registerShutdownHook( graphDb );
    // END SNIPPET: startDb

    // START SNIPPET: operationsInATransaction
    Transaction tx = graphDb.beginTx();
    try
    {
        Node john = graphDb.createNode();
        john.setProperty("name", "John" );
        Node george = graphDb.createNode();
        george.setProperty("name", "George" );

        firstNode.createRelationshipTo( secondNode, RelTypes.KNOWS );

        tx.success();
    }
    finally
    {
        tx.finish();
    }
    // END SNIPPET: removingData

    System.out.println( "Shutting down database ..." );
    // START SNIPPET: shutdownServer
    graphDb.shutdown();
    // END SNIPPET: shutdownServer
}

- RichardW

Answer 1

动态从字符串创建关系类型，这正是 org.neo4j.graphdb.DynamicRelationshipType 的存在目的。

- thobe