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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
Exceptions and eventsThis section describes exceptions and events, and explains how to handle them in DataBlade® API modules.
Database server exceptionsWhen the database server or a UDR raises a database server exception, the DataBlade® API invokes any callbacks that are registered for the exception.
Return error information to the callerThe fourth argument of a callback function is a pointer to callback user data. The user data is a C variable or structure that contains application-specific information that a callback can use.
Implement the callbackTo make a user-defined error structure available to a callback, the calling code can associate the user-defined structure with the callback or associate the user-defined structure with the database connection.

Implement the callback

To make a user-defined error structure available to a callback, the calling code can associate the user-defined structure with the callback or associate the user-defined structure with the database connection.

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