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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 SQL statementsOne basic task of a DataBlade® API module is to send SQL statements to the database server for execution.
Save setsSave sets provide a mechanism for a DataBlade® API module to access several rows simultaneously.
Free a save set

Free a save set

A save-set structure has a memory duration of PER_STMT_EXEC. Therefore, a save-set structure remains active until one of the following events occurs:

The mi_save_set_destroy() function frees the save-set structure.
The end of the current SQL statement is reached.
The mi_close() function closes the current connection.

To conserve resources, use the mi_save_set_destroy() function to explicitly deallocate the save set once your DataBlade® API module no longer needs it. The mi_save_set_destroy() function is the destructor function for a save-set structure. It frees the save-set structure and any resources that are associated with it.

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