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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.
State-transition eventsWhen the database server raises a state-transition event, the database server invokes any callbacks registered for the state transition. This section provides information about state-transition handling in DataBlade® API modules, including an explanation of state-transition events and a description of how to handle a state-transition event in a C UDR and a client LIBMI application.
Understanding state-transition eventsState-transition events occur when the database server changes its processing state. The DataBlade® API represents a state transition as one of the enumerated values of the MI_TRANSITION_TYPE data type.
End a session (Server)The MI_EVENT_END_SESSION event occurs when the database server reaches the end of the current session. A session begins when the client application opens a database connection and ends when the client application closes the connection (or when the client application ends).

End a session (Server)

The MI_EVENT_END_SESSION event occurs when the database server reaches the end of the current session. A session begins when the client application opens a database connection and ends when the client application closes the connection (or when the client application ends).

These events occur only within the context of a C UDR. Their main purpose is to clean up resources that the UDR might have allocated. The database server does not throw the MI_EVENT_END_SESSION event when it terminates abnormally.

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