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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®.
Create user-defined routines
Create special-purpose UDRsThis section describes how to create special UDRs, such as iterator functions, user-defined aggregates, and optimization functions.

Create special-purpose UDRs

This section describes how to create special UDRs, such as iterator functions, user-defined aggregates, and optimization functions.

This section describes how to write C user-defined routines (UDRs) with the following purposes.


Type of UDR	More information
Cast function	Write a cast function
Cost function	Write selectivity and cost functions
End-user routine	Write an end-user routine
Iterator function	Write an iterator function
Negator function	implementing a negator function with a C user-defined function
Parallelizable UDR	Creating parallelizable UDRs
Selectivity function	Write selectivity and cost functions
User-defined aggregates	Write an aggregate function

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