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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.
Choose a trace classTrace messages are grouped into trace classes. A trace class enables you to set up categories of related tracepoints, which you can then turn on or turn off independently.
The built-in trace classThe DataBlade® API provides a built-in trace class named __myErrors__. The __myErrors__ trace class writes out the full text of database server exceptions (errors and warnings) as they occur. You can set the trace level of __myErrors__ with mi_tracelevel_set(), just as with any other trace class.

The built-in trace class

The DataBlade® API provides a built-in trace class named __myErrors__. The __myErrors__ trace class writes out the full text of database server exceptions (errors and warnings) as they occur. You can set the trace level of __myErrors__ with mi_tracelevel_set(), just as with any other trace class.

The __myErrors__ trace class provides the following trace levels:

A level of 10 or above to trace only error messages
A level of 20 or above to trace both error and warning messages

Tip: The __myErrors__ trace class does not appear in the systraceclasses system catalog table.

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