The eXtremeDB Data Definition Language (DDL)

C/C++ applications require an external database schema defined in the eXtremeDB Data Definition Language (DDL). The schema is compiled to produce a generated API for the database objects defined in the schema which is then linked into the application. Each database has a DDL specification that identifies the database, defines each data class, its elements (fields), its relationship to other data classes, and data access methods. The DDL syntax, keywords and preprocessor are designed to be similar to elements of the C/C++ language to simplify learning and understanding.

Please use the following links to view details of these DDL features:

Base Data Types	The supported eXtremeDB data types
Preprocessor	C language type preprocessor directives
Declare Statement	The declare statement syntax and meaning
Struct Declaration	The struct declaration syntax and usage
Enum Declaration	The enum declaration syntax and usage
Class Declaration	The class declaration - defining a database Class
Element Statement	The element statement - defining fields of a Class
Access Statement	The access statement - defining indexes for a Class
Event Statement	The event statement - defining events for a Class
Reserved Words	Reserved words for the DDL processor
DDL Example	An example showing usage of the DDL features