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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™.
Opaque user-defined data typesThis section describes how to use opaque user-defined data types (UDTs). This section describes the default SQLData interface and how to override the default.
Using the SQLData interfaceTo implement a complete UDT in Java™ code, you must supply a set of data-formatting methods that convert to and from the various representations of the data type. These methods perform input and output operations for the data type such as converting text input to the internal structure that the database server uses.
HCL OneDB™ extensions to SQLInput and SQLOutput

HCL OneDB extensions to SQLInput and SQLOutput

Some of the standard SQLInput and SQLOutput Stream methods need an additional length argument to read or write an opaque data type because the HCL OneDB™ JDBC Driver cannot determine the field lengths for an opaque type. HCL OneDB database server provides the IfmxUDTSQLInput and IfmxUDTSQLOutput extensions, which inherit from the standard OneDB JDBC Driver 2.0 SQLInput and SQLOutput interfaces.