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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.
Define routine parametersWhen the routine manager invokes a C UDR, the routine manager passes to the UDR any argument values that the calling SQL statement provided. When you write a C UDR, you can define routine parameters that indicate the data types of the arguments that you expect the UDR to handle.

Define routine parameters

When the routine manager invokes a C UDR, the routine manager passes to the UDR any argument values that the calling SQL statement provided. When you write a C UDR, you can define routine parameters that indicate the data types of the arguments that you expect the UDR to handle.

This section provides information about how to define routine parameters for the following UDR arguments:

MI_DATUM argument
MI_FPARAM argument, which the routine manager passes in to every UDR

Tip: Routine arguments are optional; however, if your UDR does not require arguments, you must still declare an MI_FPARAM parameter in the C-function declaration. For more information, see The MI_FPARAM argument.

The routine manager uses the parameter data types in routine resolution. Therefore, you can have multiple UDRs with the same name, provided that their parameter lists uniquely identify the UDRs. For more information, see Routine resolution.

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