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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
Write a user-defined routineThis section outlines some implementation issues for C user-defined routines (UDRs). This section also describes the specific features and tasks of a C UDR.
Control the VP environmentThe routine manager executes your C UDR in a virtual-processor (VP) environment.
Obtain VP-environment information
Identify a VP classThe database server assigns a unique integer, called the VP-class identifier, to each VP class, including system VP classes (such as CPU and AIO) and user-defined VP classes (which the VPCLASS configuration parameter defines).

Identify a VP class

The database server assigns a unique integer, called the VP-class identifier, to each VP class, including system VP classes (such as CPU and AIO) and user-defined VP classes (which the VPCLASS configuration parameter defines).

You can obtain a VP-class identifier with either of following DataBlade® API functions.


DataBlade API function	VP-class identifier returned
mi_vpinfo_classid()	The VP-class identifier for the VP class of the current VP (the VP on which the current UDR is running)
mi_class_id()	The VP-class identifier for a specified VP class

After you have a VP-class identifier for an active VP, you can obtain the following information about the associated VP class.


VP-class information	DataBlade API function
VP-class name	mi_class_name()
Maximum number of VPs in the VP class	mi_class_maxvps()
Number of active VPs in the VP class	mi_class_numvp()

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