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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.
TracingA tracepoint is a point within the code that can send special information about the current executing state of the UDR.
Adding a tracepoint in codeA user-defined tracepoint is a point within the code of a C UDR that can send special information about the current executing state of that routine.

Adding a tracepoint in code

A user-defined tracepoint is a point within the code of a C UDR that can send special information about the current executing state of that routine.

About this task

To use a user-defined tracepoint:

Procedure

Choose the trace class for the tracepoint.
Put trace messages into the UDR code.
A tracepoint contains a trace message whose text you want to output. You assign to each tracepoint a trace class and a threshold level. If a tracepoint threshold is not greater than the current trace level, the DataBlade® API writes the associated trace message to the trace output file.
Turn tracing on with an appropriate trace level for the tracepoints that you want to execute.
You assign the current trace level when you turn on tracing with the mi_tracelevel_set() function.

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