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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.
J/Foundation Developer's GuideThe HCL® J/Foundation Developer's Guide describes how to write user-defined routines (UDRs) in the Java™ programming language for HCL OneDB™.
Create Java™ user-defined routinesA user-defined routine (UDR) is a routine that an SQL statement or another UDR can invoke. UDRs written in Java™ code use the server-side implementation of the HCL OneDB™ JDBC Driver to communicate with the database server.
Limitations for Java™ UDRs

Limitations for Java UDRs

Java™ UDRs have the following limitations in :

Return arrays for the executeBatch() method are not supported when using the direct connect method (IfxDirectConnection) for Java UDRs. Only the update count for the first statement executed in the batch is returned.
BYTE OUT parameters for Java UDRs are not supported.
A BYTE value cannot be retrieved from a BYTE column in Java UDRs.