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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.
Well-behaved routinesThe most efficient way for a C UDR to execute is in the CPU virtual-process (CPU VP) class. However, to execute in the CPU VP, the UDR must be well-behaved. A well-behaved UDR adheres to a set of safe-code requirements that prevent the UDR from interfering with the efficient operation of the CPU VP.

Well-behaved routines

The most efficient way for a C UDR to execute is in the CPU virtual-process (CPU VP) class. However, to execute in the CPU VP, the UDR must be well-behaved. A well-behaved UDR adheres to a set of safe-code requirements that prevent the UDR from interfering with the efficient operation of the CPU VP.

Safe-code requirements for a well-behaved UDR summarizes the safe-coding guidelines for a well-behaved UDR. You must ensure that your C UDR follows these guidelines for it to safely execute in the CPU VP class. Otherwise, the UDR must execute in a user-defined VP class. For more information, see Virtual processors.

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