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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.
Programming guidelinesUse this section to help you when you write the design specification for your DataBlade® module.
Programming language optionsThis section explains the programming language options you have when you use BladeSmith to generate source code for your DataBlade® module.

Programming language options

This section explains the programming language options you have when you use BladeSmith to generate source code for your DataBlade® module.

BladeSmith supports the C, C++, and Java™ external languages.

The following table lists the objects that you can implement in an external language and the languages you can use for each.

Table 1. Objects that can be implemented in languages
Object	C	C++/ActiveX	Java
Cast support functions	Yes	No	Yes
Aggregates	Yes	No	Yes
Other user-defined routines	Yes	No	Yes (with restrictions)
Opaque data types routines (server implementation)	Yes	Yes (with restrictions)	No
Value object methods (client implementation)	No	Yes	No

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