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Client APIs and toolsYou can use the HCL OneDB™ implementation of client APIs to develop applications for HCL OneDB™ database servers.
HCL OneDB™ JDBC Driver GuideThe HCL OneDB™ JDBC Driver Programmer's Guide describes how to install, load, and use HCL OneDB™ JDBC Driver to connect to the HCL OneDB™ database from within a Java™ application.
Work with opaque types
Creating opaque types and UDRs
Preparing to create opaque types and UDRs

Preparing to create opaque types and UDRs

Before you begin

Before using the UDT and UDR Manager facility, perform the following setup tasks:

Make sure your database server supports Java™.
The UDT and UDR Manager facility does not work in legacy servers that do not include Java support.
Include either the ifxtools.jar or ifxtools_g.jar file in your CLASSPATH setting.
Create a directory named /usr/informix in the database server, with owner and group set to user informix and permissions set to 777.
Add the following entry to the /etc/group file in the database server:
```
informix::unique-id-number:
```
Check the release notes for the driver and database server for any further limitations in this release.