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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.
Designing a UDRThis section provides the following design considerations for the development of a C UDR: development tools, uses of a UDR, portability, and insert and update operations.
Portability
DataBlade® API data types

DataBlade API data types

The DataBlade® API provides platform-independent data types, such as mi_smallint (two-byte integer), mi_integer (four-byte integer), and mi_double_precision (floating-point values). For a complete list of DataBlade API data types, see DataBlade API, C, and SQL data types. The mitypes.h header file defines these data types.

Tip: The mi.h header file automatically includes the milib.h header, which in turn includes the mitypes.h header file. Therefore, you do not need to explicitly include mitypes.h to use the DataBlade API data types.

To ensure maximum portability of your code, use these platform-independent data types instead of their C-language equivalents.

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