26.2.1.1.1 Graph-Bound Collections

The following describes the usage of graph-bound collections.

You must first load the graph to work with vertex and edge collections as shown in Reading Graphs from Oracle Database into the Graph Server (PGX).

Vertex Collections

You can create a vertex collection as shown in the following code:

• JShell
• Java
• Python

v0 = graph.getVertex(100) // 'graph' is the loaded graph object. '100' -> '103' are vertex ids that supposedly
v1 = graph.getVertex(101) // exist in the graph
v2 = graph.getVertex(102)
v3 = graph.getVertex(103)

myVertexSet = graph.createVertexSet("myVertexSet")  // A name is automatically generated if none given
myVertexSet.add(v0)                                 // Adds vertex 'v0' to the set
myVertexSet.addAll([v1, v2, v3])                    // Supports variadic parameter as well: myVertexSet.addAll(v1, v2, v3)

import java.util.Arrays;
import oracle.pgx.api.*;
...
PgxVertex v0 = graph.getVertex(100);
PgxVertex v1 = graph.getVertex(101);
PgxVertex v2 = graph.getVertex(102);
PgxVertex v3 = graph.getVertex(103);

VertexSet myVertexSet = graph.createVertexSet("myVertexSet");  // A name is automatically generated if none given
myVertexSet.add(v0);
myVertexSet.addAll(Arrays.asList(v1, v2, v3));

...
v0 = graph.get_vertex(100)
v1 = graph.get_vertex(101)
v2 = graph.get_vertex(102)
v3 = graph.get_vertex(103)

my_vertex_set = graph.create_vertex_set("myVertexSet") 
my_vertex_set.add(v0)
my_vertex_set.add_all([v1,v2,v3])

Edge Collections

You can create an edge collection as shown in the following code:

• JShell
• Java
• Python

e0 = graph.getEdge(100) // 'graph' is the loaded graph object. '100' -> '103' are edge ids that supposedly
e1 = graph.getEdge(101) // exist in the graph
e2 = graph.getEdge(102)
e3 = graph.getEdge(103)

myEdgeSequence = graph.createEdgeSequence("myEdgeSequence")
myEdgeSequence.add(e0)
myEdgeSequence.addAll([e1, e2, e3])

import java.util.Arrays;
import oracle.pgx.api.*;
...
PgxEdge e0 = graph.getEdge(100);
PgxEdge e1 = graph.getEdge(101);
PgxEdge e2 = graph.getEdge(102);
PgxEdge e3 = graph.getEdge(103);

EdgeSequence myEdgeSequence = graph.createEdgeSequence("myEdgeSequence");
myEdgeSequence.add(e0);
myEdgeSequence.addAll(Arrays.asList(e1, e2, e3));

e0 = graph.get_edge(100)
e1 = graph.get_edge(101)
e2 = graph.get_edge(102)
e3 = graph.get_edge(103)

my_edge_sequence = graph.create_edge_sequence("my_edge_sequence")
my_edge_sequence.add(e0)
my_edge_sequence.add_all([e1, e2, e3])