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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.
Develop DataBlade® modules that use the R-tree secondary access method
Design a user-defined data type
Implementing data type hierarchy
Example data type hierarchy

Example data type hierarchy

Assume you are designing three data types: MyPoint, MyBox, and MyCircle. Because they are all two-dimensional spatial data types, a supertype called MyShape could also be defined. This type hierarchy is described in the following figure.

begin figure description - This figure is described in the surrounding text. - end figure description — Figure 1: Data type hierarchy

Using SQL, create casts between the three subtypes (MyPoint, MyBox, and MyCircle) and the supertype, MyShape.

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