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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 DataBlade® module routines in CThis section contains information to help you edit and compile C language source code generated by DataBlade®.
Edit opaque type support routines in opaque.cThe following subsections describe the code BladeSmith generates for each routine and modifications you might need to make to the generated code.
Comparison functionsThe HCL OneDB™ database server calls DataBlade® module comparison functions to compare two opaque type values.

Comparison functions

The HCL OneDB™ database server calls DataBlade® module comparison functions to compare two opaque type values.

For example, database users can compare opaque values in SQL statements. If you want to support B-tree or R-tree indexes on an opaque type, you must provide an additional set of comparison functions.