Home
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™.
Extend data types
Extend the data type system

Extend the data type system

You can extend the data type system by writing routines that provide the following additional behavior for existing built-in or extended data types:

Define operators to provide additional operations on data types.
Define operator classes to provide new functionality for a secondary-access method (an index) on a data type.
Define casts to provide conversions between data types.
Define functions that provide information for the optimizer.

You must register each new function in the database with the CREATE FUNCTION statement.

If you plan to enable the implicit or explicit execution of a UDR across databases, all user-defined data types and casts must be defined in all of the participating databases of the same database server instance.