5.4.11 Deleting Vertices and Edges

You can remove vertex and edge instances individually, or all of them simultaneously. Use these methods:

• OraclePropertyGraph.removeEdge: Removes the specified edge from the graph.

• OraclePropertyGraph.removeVertex: Removes the specified vertex from the graph.

• OraclePropertyGraph.clearRepository: Removes all vertices and edges from the property graph instance.

The following code fragment removes edge e1 and vertex v1 from the graph instance. The adjacent edges will also be deleted from the graph when removing a vertex. This is because every edge must have an beginning and ending vertex. After removing the beginning or ending vertex, the edge is no longer a valid edge.

// Remove edge e1
opg.removeEdge(e1);

// Remove vertex v1
opg.removeVertex(v1);

The OraclePropertyGraph.clearRepository method can be used to remove all contents from an OraclePropertyGraph instance. However, use it with care because this action cannot be reversed.