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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™.
The HCL OneDB™ JDBC DriverAll UDRs written in Java™ code can access the database server data through the HCL OneDB™ JDBC Driver application programming interface (API). This section briefly describes the HCL OneDB™ implementation of the OneDB® JDBC Driver API and the server-side OneDB® JDBC Driver.

The HCL OneDB JDBC Driver

All UDRs written in Java™ code can access the database server data through the HCL OneDB™ JDBC Driver application programming interface (API). This section briefly describes the HCL OneDB implementation of the OneDB JDBC Driver API and the server-side OneDB JDBC Driver.

Generally, the HCL® OneDB server-side OneDB JDBC Driver derives from the client-side driver so that the two drivers are essentially the same. Java UDRs require some differences, however, to use the OneDB JDBC Driver from the server side. This section describes the public OneDB JDBC Driver interfaces and OneDB JDBC Driver subprotocols that the OneDB JDBC Driver provides specifically for server-side OneDB JDBC Driver applications, and restrictions that apply to server-side OneDB JDBC Driver applications. For principal documentation of the HCL OneDB JDBC Driver, see the HCL OneDB JDBC Driver Programmer's Guide.