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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.
DBDK InfoShelfThe DataBlade® Developers Kit InfoShelf is designed to help you work with BladeSmith.
DataBlade® Developers Kit TutorialThe Tutorial is a set of exercises that demonstrate how to create extensions to HCL Informix® and package them as DataBlade® modules by using DBDK. Support for DataBlade Developers Kit (DBDK) is removed starting Informix Server 14.10.xC6.
Tutorial exercise 4: Creating opaque data typesThis exercise demonstrates how to create opaque data types, their support routines, and user-defined routines that operate on them. This exercise has 11 steps. It takes approximately one hour to complete.
Creating the Distance() function

Creating the Distance() function

About this task

To create the Distance() function:

Procedure

Choose Edit > Insert > Routine and type the following information in the New Routine wizard.


Routine Property	Value
Routine Name (SQL)	Distance
Language	C
Return type	double precision
Statement Local Variables	No
Arguments	Name: Pnt1, Type: Pnt, Default: leave blank Name: Pnt2, Type: Pnt, Default: leave blank
Options for how the database server calls this routine	Only the Routine does not accept NULL arguments check box must be checked; clear the Routine may return inconsistent check box.
Routine Name (C)	Distance
Shared object path	Leave as default
Behavior of Routines	Well-behaved
Special Stack Requirements	None
Cost of a Routine	0
Related Routines	None
Object grant privileges	Grant execute privileges

Click Finish and then choose Project > Save to save your project.

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