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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 2: Creating distinct data types and castsThis exercise demonstrates how to create distinct data types and the casts that convert them. This exercise consists of 14 steps. It takes approximately one hour to complete.
Creating the integer to temperature, CTemp to FTemp, and FTemp to CTemp casts

Creating the integer to temperature, CTemp to FTemp, and FTemp to CTemp casts

About this task

To create the integer to temperature, CTemp to FTemp, and FTemp to CTemp casts:

Procedure

Type the following information in the New Cast wizard for each cast.


Cast Property	Integer to temperature Value	CTemp to FTemp value	FTemp to CTemp value
Cast from type	integer	CTemp	FTemp
Cast to type	temperature	FTemp	CTemp
Cast must be called for implicit type conversion	Yes	Yes	Yes
Cast requires a user defined cast support function	Yes	Yes	Yes
Support routine name is:	IntToTempCast	FTempCast	CTempCast
Language	C	C	C
Object grant privileges	Grant execute privileges	Grant execute privileges	Grant execute privileges

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