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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
Develop a user-defined routineA C user-defined routine (UDR) is a UDR that is written in the C language and uses the server-side implementation of the DataBlade® API to communicate with the database server. C UDRs (functions and procedures) are implemented as C-language functions. DataBlade® modules often include C UDRs that are made available for use by registering them in the database.
Creating UDR codeThis section provides an overview of C UDR development.
Routine-state informationWhen the routine manager executes a C UDR, it puts information about the routine sequence for the UDR in an MI_FPARAM structure and passes this MI_FPARAM structure as the last argument to the UDR.

Routine-state information

When the routine manager executes a C UDR, it puts information about the routine sequence for the UDR in an MI_FPARAM structure and passes this MI_FPARAM structure as the last argument to the UDR.

From the MI_FPARAM structure, the UDR can obtain the following information:

The number and data types of its arguments
The assumed data type of its return value (for a user-defined function only)
Any user data associated with the UDR

For information about how the routine manager executes a UDR, see Execute a UDR. For information about how to access the routine-state information in the MI_FPARAM structure, see Access MI_FPARAM routine-state information.

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