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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.
DataBlade® API Programmer's GuideThe Informix® DataBlade® API Programmer's Guide describes information about the DataBlade® API, the C-language application programming interface (API) provided with HCL Informix®.
Create user-defined routines
Extend data typesThis section describes the ways to extend data types with C user-defined routines (UDRs).

Extend data types

This section describes the ways to extend data types with C user-defined routines (UDRs).

You can extend data types in the following ways:

Create an opaque data type with the C language
Create a distinct data type
Write operator-class support functions
Write optimization functions, including selectivity functions, cost functions, negator functions, and user-defined statistics functions

Tip: For general information about the creation of an opaque type and its support routines, see the Informix® User-Defined Routines and Data Types Developer's Guide.

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