Question

For example, two simple vertices in an OrientDB Graph:

orientdb> CREATE DATABASE local:/databases/test admin admin local graph;       
Creating database [local:/databases/test] using the storage type [local]...
Database created successfully.
Current database is: local:/graph1/databases/test
orientdb> INSERT INTO V (label,in,out) VALUES ('vertexOne',[],[]);                                                                                                                 
Inserted record 'V#6:0{label:vertexOne,in:[0],out:[0]} v0' in 0.001000 sec(s).
orientdb> INSERT INTO V (label,in,out) VALUES ('vertexTwo',[],[]);
Inserted record 'V#6:1{label:vertexTwo,in:[0],out:[0]} v0' in 0.000000 sec(s).

Is there a way to create an edge between these two vertexes by only knowing their ‘label’s, not their ‘RID’s?

For example (doesn’t work):

orientdb> INSERT INTO E (label, in, out) VALUES ('is_connected_to', (SELECT @rid FROM V WHERE label = 'vertexOne'), (SELECT @rid FROM V WHERE label = 'vertexTwo'));
Inserted record 'E#7:0{label:is_connected_to,in:null,out:null} v0' in 0.001000 sec(s).

I’ve tried ‘FLATTEN’ as a potential workaround. No luck:

orientdb> INSERT INTO E (label, in, out) VALUES ('is_connected_to', (SELECT FLATTEN(@rid) FROM V WHERE label = 'vertexOne'), (SELECT FLATTEN(@rid) FROM V WHERE label = 'vertexTwo'));
Inserted record 'E#7:1{label:is_connected_to,in:null,out:null} v0' in 0.001000 sec(s).

The edges created are between null and null. No dice.

I was hoping to use OrientDB SQL for this since I have a very large import of connections and the SQL approach seems to be faster.

However, if this isn’t possible, any suggestions about an alternative for batch importing edges (roughly 2M)?

Answer 1

SQLCreateEdge is probably what you’re trying to do:

create edge from
(select from V where label = 'vertexOne')
to
(select from V where label = 'vertexTwo')
set label = 'is_connected_to'

however, for very large import of connections i suggest SQLCreateLink. this gem is suggested here.