14.6.1.6 Using Graph Builder with Implicit IDs

The GraphBuilder supports an AUTO_GENERATED generation strategy that allows to omit the edge or vertex IDs.

In this generation strategy, the graph server (PGX) will automatically assign IDs to the entities being added to the changeset. PgxSession supports createGraphBuilder(IdGenerationStrategy vertexIdGenerationStrategy, IdGenerationStrategy edgeIdGenerationStrategy) and createGraphBuilder(IdType idType, IdGenerationStrategy vertexIdGenerationStrategy, IdGenerationStrategy edgeIdGenerationStrategy) to specify the IdGenerationStrategy.

The following example illustrates creating a graph with three vertices and three edges using the GraphBuilder interface.

• JShell
• Java
• Python

opg4j> var builder = session.createGraphBuilder(IdGenerationStrategy.AUTO_GENERATED, IdGenerationStrategy.AUTO_GENERATED)

opg4j> var v1 = builder.addVertex()
opg4j> var v2 = builder.addVertex()
opg4j> var v3 = builder.addVertex()
opg4j> builder.addEdge(v1, v2)
opg4j> builder.addEdge(v1, v3)
opg4j> builder.addEdge(v3, v2)
opg4j> var graph = builder.build()

import oracle.pgx.api.*;

PgxSession session = Pgx.createSession("example");
GraphBuilder<Integer> builder = session.createGraphBuilder(IdGenerationStrategy.AUTO_GENERATED, IdGenerationStrategy.AUTO_GENERATED);

VertexBuilder<Integer> v1 = builder.addVertex();
VertexBuilder<Integer> v2 = builder.addVertex();
VertexBuilder<Integer> v3 = builder.addVertex();
builder.addEdge(v1, v2);
builder.addEdge(v1, v3);
builder.addEdge(v3, v2);

PgxGraph graph = builder.build();

>>> builder = session.create_graph_builder(vertex_id_generation_strategy='auto_generated', edge_id_generation_strategy='auto_generated')
>>> v1 = builder.add_vertex()
>>> v2 = builder.add_vertex()
>>> v3 = builder.add_vertex()
>>> builder.add_edge(v1, v2)
>>> builder.add_edge(v1, v3)
>>> builder.add_edge(v3, v2)
>>> graph = builder.build()