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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.
Debug a UDRBecause a UDR runs as part of the database server process, the routine must not do anything that might negatively affect the running of the database server, such as exiting. This section provides information about how to use a C debugger to attach to a virtual processor, handle the debugging session of a C UDR, and use DataBlade® API tracing.
Attaching to the database server process with the debuggerTo debug your DataBlade® module, use a debugger that can attach to the active server process and access the symbol tables of dynamically loaded shared object files.

Attaching to the database server process with the debugger

To debug your DataBlade® module, use a debugger that can attach to the active server process and access the symbol tables of dynamically loaded shared object files.

About this task

On UNIX™ or Linux™, the debugger and dbx utilities meet these criteria. To start a debugger, enter the following command at the shell prompt, in which pid is the process identifier of the CPU or virtual processor:

debugger - pid

This command starts the debugger on the server virtual-processor process without starting a new instance of the virtual processor. For more information about available debugger commands, see the debugger manual page.

To attach to the database server process:

Procedure

Create a debugging version of the shared-object file.
Connect to the database server from a client application, such as .
Make sure that the shared-object file is loaded into the server address space.
Obtain the process identifier for the virtual processor you want to debug.
Start the debugger on the server process.

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