OrientDB - Trouble storing data from a java application - database

Question

I am trying to store triplets inside of OrientDB as Vertex-Edge-Vertex relationships inside of a Java application that I am working on. My understanding of using OrientDB is that I can use the Tinkerpop API and instantiate a graph like this:
OrientGraph graph = new OrientGraph("local:/tmp/orient/test_db");
That is really all I do to instantiate the graph, then I try to connect vertices with edges in a loop like this: (Note that a Statement is a triplet consisting of subject-relationship-object.)
for (Statement s : statements) {
Vertex a = graph.addVertex(null);
Vertex b = graph.addVertex(null);
a.setProperty("Subject", s.getSubject().toBELShortForm());
RelationshipType r = s.getRelationshipType();
if (s.getObject() != null) {
b.setProperty("Object", s.getObject().toBELShortForm());
Edge e = graph.addEdge(null, a, b, r.toString());
}
else {
b.setProperty("Object", "null");
Edge e = graph.addEdge(null, a, b, "no-relationship");
}
}
I then loop through the vertices of the graph and print them out like this:
for (Vertex v : graph.getVertices()) {
out.println("Vertex: " +v.toString());
}
It does print a lot of vertices, but when I log into the server via the command line, using server.sh, all I see are the 3 records for ORole and 4 records for OUser. What am I missing here? Because it seems like although my java program runs and completes, the data is not being put into the database.

Answer 1

The answer, at least for now, seems to be not to use the Tinkerpop API but rather the Orient API directly. This is the same thing I was doing with Tinkerpop, but using the OrientDB API. This actually does store my data into the database:
for (Statement s : statements) {
ODocument sNode = db.createVertex();
sNode.field("Subject", s.getSubject().toBELShortForm());
sNode.save();
ODocument oNode = db.createVertex();
if (s.getObject() != null) {
oNode.field("Object", s.getObject().toBELShortForm());
oNode.save();
}
else {
oNode.field("Object", "null");
oNode.save();
}
RelationshipType r = s.getRelationshipType();
ODocument edge = db.createEdge(sNode, oNode);
if (r != null) {
edge.field(r.toString());
edge.save();
}
else {
edge.field("no relationship");
edge.save();
}
}

Answer 2

Create the Graph under the Server's databases directory. Below an example assuming OrientDB has been installed under "/usr/local/orient":
OrientGraph graph = new OrientGraph("local:/usr/local/orient/databases/test_db");
When you start the server.sh you should find this database correctly populated.
Lvc#