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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 DataBlade® Developers Kit (DBDK) tools to develop and package DataBlade® modules.
Getting started with DataBlade® module developmentThis section provides an overview of DataBlade® module development and describes the resources and tools the HCL OneDB™ database server provides to facilitate development.
Prepare to develop DataBlade® modulesThis section suggests how to prepare for developing DataBlade® modules. This overview is intended to act as a map for information resources.
Design your DataBlade® moduleDataBlade® modules can contain complex operations. A good design is critical to your success.
Programming resources

Programming resources

The following table lists the programming language options you have when writing DataBlade® module code and refers you to sources of information about them.

Table 1. Programming language options and resources
Language	Information sources
C	Programming DataBlade module routines in C HCL OneDB™ DataBlade API Programmer's Guide
ActiveX/C++ (client-side programming and Windows™ server projects only)	Create ActiveX value objects The ActiveX value objects HCL OneDB DataBlade API Programmer's Guide
Java™	Programming DataBlade modules in Java HCL® J/Foundation Developer's Guide HCL OneDB JDBC Driver Programmer's Guide
Stored Procedure Language (SPL)	HCL OneDB Guide to SQL: Tutorial

For specific language options and guidelines, see Programming guidelines.

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