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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™.
Run a user-defined routine
Invoke a UDR in an SQL statement
Invoke a user-defined function in an expression

Invoke a user-defined function in an expression

You can invoke a user-defined function in an expression in the select list of a SELECT statement, or in the WHERE clause of an INSERT, SELECT, UPDATE, or DELETE statement.

For example, with the factorial function described in Invoke a function, you might write the following SELECT statement:

SELECT * FROM tab_1 WHERE nFact(col1) > col3