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Extending Informix®Beyond standard relational database objects, HCL Informix® can be extended to handle specialized data types, access methods, routines, and other objects. Informix® includes many built-in extensions that are fully integrated in the database server. Informix® also provides DataBlade® modules, which are packages of extended database objects for a particular purpose and that are installed separately from the database server. Alternatively, you can create your own user-defined objects for Informix®.
Creating extensionsYou can create user-defined data types, routines, access methods, and other database objects to suit your needs. You can use application programming interfaces to write user-defined routines and applications that access data in Informix® databases.
R-Tree Index User's GuideThe Informix® R-Tree Index User's Guide describes the HCL Informix® R-tree secondary access method and how to access and use its components.
Appendix
Shapes3 sample DataBlade® module
Sample C code

Sample C code

The sample DataBlade® module includes four data types: MyShape, MyBox, MyCircle, and MyPoint.

The MyShape data type implements the behavior of all four types. The MyPoint, MyCircle, and MyBox data types delegate to the MyShape data type for their functionality. This means that the C code that implements the functions of MyShape also implements the same function for the subtypes MyPoint, MyCircle, and MyBox.

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