Classes

A Class is a type of data model that allows you to define certain rules for documents that belong to it. As a concept, the class in OrientDB has the closest relationship with the table in relational databases, but (unlike tables) classes can be schema-less, schema-full or mixed. Classes can inherit from other classes, creating trees of classes.

For example a Class Student has the following properties and constrains:

Class................: Student
Default cluster......: student (id=96)
Supported cluster ids: [96]
Properties:

-----------+--------+--------------+-----------+----------+----------+-----+-----+
 NAME      | TYPE   | LINKED TYPE/ | MANDATORY | READONLY | NOT NULL | MIN | MAX |
           |        | CLASS        |           |          |          |     |     |
-----------+--------+--------------+-----------+----------+----------+-----+-----+
 birthDate | DATE   | null         | false     | false    | false    |     |     |
 name      | STRING | null         | false     | false    | false    |     |     |
 surname   | STRING | null         | false     | false    | false    |     |     |
-----------+--------+--------------+-----------+----------+----------+-----+-----+