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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™.
Extend data types
Understanding data types
Extended data types

Extended data types

The extensible data type system allows you to:

Define new data types, called extended data types, to extend the data type system
Define the behavior of extended data types:
- The operations that are supported on the extended data types
- New operator class that supports the extended data type and provides new functionality for a secondary-access method
- Additional casts to provide data conversions between the extended data types and other data types
- Functions that collect statistics for the optimizer

You can define the following extended data types:

Complex data types
- Collection types
- Row types
UDTs
- Opaque data types
- Distinct data types

The database server stores information about extended data types in the sysxtdtypes and sysxtdtypeauth system catalog tables. For information about these tables, refer to the HCL OneDB™ Guide to SQL: Reference.