Getting Started With Graph Databases, Apache TinkerPop, and Gremlin - Tutorial 3

GettingStartedTutorial3Commands.txt

// Create an instance of the "Modern" toy graph and the traversal source in
// one command

g = TinkerFactory.createModern().traversal()

// Get the "age" values of the two "person"s named "vadas" and "marko"

g.V()\
 .has('person', 'name', within('vadas','marko'))\
 .values('age')

// Get the mean of the "age" values of the two "persons" named "vadas" and
// "marko"

g.V()\
 .has('person', 'name', within('vadas','marko'))\
 .values('age')\
 .mean()

// Get the "names" of the "persons" that "marko" "created" software with
// (flawed version)

g.V()\
 .has('person', 'name', 'marko')\
 .out('created')\
 .in('created')\
 .values('name')

// Get the "names" of the "persons" that "marko" "created" software with
// (good version)

g.V()\
 .has('person', 'name', 'marko')\
 .as('exclude')\
 .out('created')\
 .in('created')\
 .where(neq('exclude'))\
 .values('name')

// Place a Gremlin on every vertex in the graph then traverse out twice

g.V()\
 .out()\
 .out()

// Place a Gremlin on every vertex in the graph then traverse out twice then
// get the paths

g.V()\
 .as('a')\
 .out()\
 .as('b')\
 .out()\
 .as('c')\
 .select('a', 'b', 'c')

// Group all the vertices in the graph by their label

g.V()\
 .group()\
 .by(label)

// Group all the vertices in the graph by their label and use the "name"
// property as the item value

g.V()\
 .group()\
 .by(label)\
 .by('name')