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Extending HCL OneDB™Beyond standard relational database objects, HCL OneDB™ can be extended to handle specialized data types, access methods, routines, and other objects. HCL OneDB™ includes many built-in extensions that are fully integrated in the database server. HCL OneDB™ 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 HCL OneDB™.
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 HCL OneDB™ 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 OneDB™ databases.
DataBlade® Developers Kit User's GuideThe HCL OneDB™ DataBlade® Developers Kit Users Guide describes how to use OneDB® DataBlade® Developers Kit (DBDK) tools to develop and package DataBlade® modules.
AppendixesThis section contains additional reference information.
Complete BladeSmith-generated codeThis section provides tables that list the types of objects BladeSmith generates, indicate whether BladeSmith generates complete code or template code you must complete, and provide a reference to the instructions in this guide for completing the code.
User-defined routines in C

User-defined routines in C

The following table provides references to sections in this guide that explain how to complete or customize code for C language user-defined routines that BladeSmith generates.

Table 1. User-defined routines in C
C object	Complete code?	Customizable code?	How to complete or customize the code
User-defined routines (general)	No	Yes	See Most user-defined routines.
Cast support functions	No	Yes	See Cast support functions.
Aggregate functions: AggregateInit() AggregateIter() AggregateComb() AggregateFinl()	No	Yes	See Aggregate functions.
Selectivity functions	No	Yes	See Selectivity functions.
Iterator functions	No	Yes	See Iterator functions.