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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®.
Database access
Execute user-defined routinesThis section provides information about how to call a user-defined routine (UDR).
Obtain trigger execution information and HDR database server status
HDR status informationTo enable UDRs to recognize a High-Availability Data Replication (HDR) configuration, you can use the mi_hdr_status() function.

HDR status information

To enable UDRs to recognize a High-Availability Data Replication (HDR) configuration, you can use the mi_hdr_status() function.

The mi_hdr_status() function checks if the current database server is executing in an HDR environment and returns the following information:

The server type, such as primary server, SD secondary server, RS secondary server, or HDR secondary server
The HDR status
The ability to update data on secondary servers

For a full description and the syntax of this function, see the Informix® DataBlade® API Function Reference.

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