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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® Developers KitThe DataBlade® Developers Kit (DBDK) guides contain information about the tools you can use to develop and package DataBlade® modules, which extend the functionality of HCL Informix® databases.
DataBlade® Developers Kit User's GuideThe HCL Informix® DataBlade® Developers Kit User's Guide describes how to use tools to develop and package DataBlade® modules.
Programming DataBlade® module routines in CThis section contains information to help you edit and compile C language source code generated by DataBlade®.
Generated code
Server connection handleBladeSmith calls mi_open() at the beginning of many of the routines it generates. The mi_open() call obtains a database server connection handle, which is a required argument in many DataBlade® API calls.

Server connection handle

BladeSmith calls mi_open() at the beginning of many of the routines it generates. The mi_open() call obtains a database server connection handle, which is a required argument in many DataBlade® API calls.

If your routine does not need a connection handle, remove the mi_open() and mi_close() functions that BladeSmith adds to your code.

Tip: If the only DataBlade API call your routine makes is to mi_db_error_raise(), you do not need a connection handle. You can pass a null value to mi_db_error_raise().

For routines running in the database server address space, except the large object DataBlade API routines, the connection handle enables client and database server routines to use the same DataBlade API routines.

When mi_open() is called at the beginning of a generated routine, mi_close() is called to release the handle immediately before the routine returns.

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