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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™.
Create user-defined casts
Create a user-defined cast
Choose the kind of user-defined cast

Choose the kind of user-defined cast

You specify how a database server treats a cast when you use the CREATE CAST statement. The database server supports two kinds of user-defined casts:

Implicit cast
Explicit cast
The database server invokes an explicit cast to perform conversions between two data types only when you specify the CAST AS keywords or the double colon (::) cast operator.

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