14.6.1.2 Adding a Vertex Property

You can also add vertices separately and assign property values to them.

The following example shows how to add a vertex property using the GraphBuilder interface.

• JShell
• Java
• Python

opg4j> var builder = session.createGraphBuilder()
opg4j> builder.addVertex(1).setProperty("double-prop", 0.1)
opg4j> builder.addVertex(2).setProperty("double-prop", 2.0)
opg4j> builder.addVertex(3).setProperty("double-prop", 0.3)
opg4j> builder.addVertex(4).setProperty("double-prop", 4.56789)
opg4j> builder.addEdge(1, 2)
opg4j> builder.addEdge(2, 3)
opg4j> builder.addEdge(2, 4)
opg4j> builder.addEdge(3, 4)
opg4j> builder.addEdge(4, 2)
opg4j> var graph = builder.build()

import oracle.pgx.api.*;

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

builder.addVertex(1).setProperty("double-prop", 0.1);
builder.addVertex(2).setProperty("double-prop", 2.0);
builder.addVertex(3).setProperty("double-prop", 0.3);
builder.addVertex(4).setProperty("double-prop", 4.56789);

builder.addEdge(1, 2);
builder.addEdge(2, 3);
builder.addEdge(2, 4);
builder.addEdge(3, 4);
builder.addEdge(4, 2);

PgxGraph graph = builder.build();

from pypgx import get_session

session = get_session(session_name="example")
builder = session.create_graph_builder()

builder.add_vertex(1).set_property("double-prop", 0.1)
builder.add_vertex(2).set_property("double-prop", 2.0)
builder.add_vertex(3).set_property("double-prop", 0.3)
builder.add_vertex(4).set_property("double-prop", 4.56789)

builder.add_edge(1, 2)
builder.add_edge(2, 3)
builder.add_edge(2, 4)
builder.add_edge(3, 4)
builder.add_edge(4, 2)

graph=builder.build()

If the value for a property is missing for a vertex or an edge, a default value is assumed as shown:

Table 14-4 Default Property Values

Properties	Default Values
Numeric	0 (or the respective equivalent)
Boolean	false
Date	1.1.1970 00:00:00
String	null

Tip:

Multiple calls to setProperty can be chained to set multiple property values at once.