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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

Sources of connection information about a UNIX operating system

The sqlhosts file, which contains definitions for all valid database servers in the network environment
The INFORMIXSERVER environment variable, which specifies the default database server for the application

Many other environment variables can customize the database environment. For more information, see the HCL OneDB™ Guide to SQL: Reference and the HCL OneDB Administrator's Guide.