ODatabaseDocument - newEdge()

This method creates a new edge between the given vertices.

Creating Edges

When using OrientDB as a Graph database, this method allows you to create new edges on the database and connect them to related vertices. To create new vertices on the database, see the newVertex() method.

Syntax

There are a few different versions available when using this method:

// METHOD 1
default OEdge ODatabaseDocument().newEdge(OVertex fromV, OVertex toV)

// METHOD 2
OEdge ODatabaseDocument().newEdge(OVertex fromV, OVertex toV, OClass class)

// METHOD 3
OEdge ODatabaseDocument().newEdge(OVertex fromV, OVertex toV, String class-name)

Edges have their own classes in OrientDB. When using the first method, the edge is created using the default E class. The other methods allow you to set the specific edge class that you want to use.

Return Value

This method returns an OEdge instance of the edge it creates.

Example

Imagine an application that makes frequent use a particular edge class. You might find it convenient to write a method that automatically calls that class by default when creating new edges.For instance, in a class handling social network accounts:

// INITIALIZE VARIABLES
private static String edgeClass = "subscription"; 
private ODatabaseDocument db;
...

// SUBSCRIBE TO USER'S BLOG
public void subscribe(OVertex subscriber, OVertex publisher){

   db.newEdge(subscriber, publisher, edgeClass); 

}