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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.
Code a C UDRWhen you code a C UDR, you define routine parameters, obtain argument values, define a return value, and code the routine body to write a C function.
Code the routine bodyThe actual work of the C UDR is done with C-language statements in the routine body.

Code the routine body

The actual work of the C UDR is done with C-language statements in the routine body.

You can use the following statements and calls in the routine body:

C-language statements
Calls to functions in libraries that the DataBlade® API supports
For a description of these function libraries, see Regular public functions.
Calls to other C functions
You can call any of the following kinds of C functions:
- Any other C UDR that is linked into the same shared-object file
  For more information, see Call UDRs within a DataBlade API module.
- A C UDR that is not in the same shared-object file
  For more information, see Call UDRs with the Fastpath interface.

You cannot directly call any other functions within a C UDR.

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