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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.
Create DataBlade® objects by using BladeSmithUse BladeSmith to create DataBlade® modules.
Create DataBlade® module objectsBladeSmith uses wizards to create and edit objects.
Create routinesYou can define public or private user-defined routines that support your DataBlade® module. You can specify if the routine is called by SQL or is an internal routine.
Related functionsIf your user-defined function compares or acts as a filter for two instances of the same data type and returns a Boolean result, you can specify related functions to optimize the execution of the function when it is called in the WHERE clause of a SELECT statement.

Related functions

If your user-defined function compares or acts as a filter for two instances of the same data type and returns a Boolean result, you can specify related functions to optimize the execution of the function when it is called in the WHERE clause of a SELECT statement.

Important: Related functions must exist before you can choose them. You can create them before you create the function they are related to, or you can update the original routine to add related routines after you create them.

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