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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 an opaque data type
Creating an opaque data type
Create SQL-invoked functions
Conditional operators for opaque data types

Conditional operators for opaque data types

The database server supports the following relational operators on an opaque data type in the conditional clause of SQL statements:

The IS and IS NOT operators
The IN operator if the equal() function has been defined
The BETWEEN operator if the compare() function has been defined

Tip: The database server also uses the compare() function as the support function for the default B-tree operator class. For more information, see Extensions of the btree_ops operator class.

For more information about the conditional clause, see the Condition segment in the HCL OneDB™ Guide to SQL: Syntax. For more information about the compare() function, see Comparison function for opaque data types.