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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.
Change a UDRThis section provides information about how to alter a C UDR and how to unload a shared-object file.
Alter a routineThe SQL statements ALTER FUNCTION, ALTER PROCEDURE, and ALTER ROUTINE allow you to alter some of the routine modifiers of a UDR after the UDR has been registered.

Alter a routine

The SQL statements ALTER FUNCTION, ALTER PROCEDURE, and ALTER ROUTINE allow you to alter some of the routine modifiers of a UDR after the UDR has been registered.

For information about how to alter a UDR, see the Informix® User-Defined Routines and Data Types Developer's Guide and the syntax of the ALTER FUNCTION, ALTER PROCEDURE, and ALTER ROUTINE statements in the Informix Guide to SQL: Syntax.

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