YQL-Create-Class.md

YQL - CREATE CLASS

Creates a new class in the schema.

Syntax

CREATE CLASS <class>
[IF NOT EXISTS]
[EXTENDS <super-class>[, <super-class>]*] [ABSTRACT]

• <class> — defines the name of the class you want to create. The first character must be a letter; subsequent characters can be alphanumeric or underscores.
• IF NOT EXISTS — if specified, the statement is ignored when the class already exists (instead of failing with an error).
• <super-class> — defines one or more superclasses you want to extend with this class. When specifying multiple superclasses, separate them with commas.
• ABSTRACT — defines the class as abstract. You cannot create instances of an abstract class.

A class should extend V (Vertex) or E (Edge). Classes that do not extend V or E can be created at the schema level, but they are not usable through the Gremlin API.

Examples

• Create the class Account:

CREATE CLASS Account EXTENDS V

• Create the class Car to extend Vehicle:

CREATE CLASS Car EXTENDS Vehicle

• Create the class Person as an abstract class:

CREATE CLASS Person EXTENDS V ABSTRACT

• Create the class FlyingCar extending both Car and Aircraft:

CREATE CLASS FlyingCar EXTENDS Car, Aircraft

For more information, see

• ALTER CLASS
• DROP CLASS
• YQL Commands