Search code examples
javagremlintinkerpop3

How to find graph schema in Gremlin?

I wanna to find all node and edge properties in graph. How can I list node (or edge) properties that exist in graph?

for example if nodes has 3 non-reserved properties such as NAME, education, gender. I wanna a methods like

g.V().schema().toList();
// result: [ID, LABEL, NAME, GENDER, EDUCATION]
Solution

  • If all nodes have a same properties. we can find the properties of the first vertex and generalize it to all nodes:

    TinkerGraph tg = TinkerGraph.open() ;
tg.io(IoCore.graphml()).readGraph("src\\main\\resources\\air-routes.graphml");
GraphTraversalSource g = tg.traversal();

g.V().propertyMap().select(Column.keys).next();
// result = {LinkedHashSet@1831}  size = 12
// 0 = "country"
// 1 = "code"
// 2 = "longest"
// 3 = "city"
// 4 = "elev"
// 5 = "icao"
// 6 = "lon"
// 7 = "type"
// 8 = "region"
// 9 = "runways"
// 10 = "lat"
// 11 = "desc"

    but If there is no guaranty to each node has a same set of properties, I don't find any other solution instead of retrieving all properties in a Map List and find distinct property with java collection methods (outside Gremlin).