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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.
User-Defined Routines and Data Types Developer's GuideThe HCL OneDB™ User-Defined Routines and Data Types Developer's Guide describes how to define new data types and enable user-defined routines (UDRs) to extend HCL OneDB™.
A user-defined routine
Tasks that you can perform with user-defined routines
Extend data type support

Extend data type support

HCL OneDB™ provides support for the following kinds of UDRs.


UDR task	SPL routines	C routines	Java™ routines	For more information
Cast function	Yes	Yes	Yes	Create user-defined casts
Cost function	No	Yes	No	Improve UDR performance
End-user routine	Yes	Yes	Yes	Create an end-user routine
Iterator function	No	Yes	Yes	Develop a user-defined routine
Negator function	Yes	Yes	Yes	Improve UDR performance
Opaque data type support function	No	Yes	Yes	Create an opaque data type
Operator function	Yes	Yes	Yes	Extend operators and built-in functions
Operator-class function	No	Yes	No	Extend an operator class
Parallelizable UDR	No	Yes	Yes	Improve UDR performance
Statistics function	No	Yes	Yes	Improve UDR performance
Selectivity function	No	Yes	No	Improve UDR performance
User-defined aggregate	Yes	Yes	Yes (with some limitations)	Create user-defined aggregates

Tip: When you want to perform an iteration in SPL, use the WITH RESUME keywords.

To extend the support for one of these kinds of functions, you can write your own version of the appropriate function and register it with the database.

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