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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.
ESQL/C GuideThe HCL OneDB™ ESQL/C Programmer's Manual explains how to use , the HCL OneDB™ implementation of Embedded Structured Query Language (SQL) for C (ESQL/C), to create client applications with database-management capabilities.
Database server communication
Working with the database serverThese topics explain how the HCL® OneDB® ESQL/C program can interact with a database server.
The client-server connectionThe application can establish a connection to any valid database environment. A database environment can be a database, a database server, or a database and a database server.
Sources of connection information about a UNIX™ operating system
Specify the default database server

Specify the default database server

For your application to communicate with any database server, you must set the INFORMIXSERVER environment variable to specify the name of the default database server. Therefore, the name of the default database server must exist in the sqlhosts file and sqlhosts must exist on the computer that runs the application.