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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.
What is HCL OneDB™ ESQL/C?
Compile programs
The esql command
Requirements for using the esql command

Requirements for using the esql command

Before you use esql, make sure that:

The file names of your source files have the .ec extension. You can also use the .ecp extension if you want the C preprocessor to run before the preprocessor.
You have set the environment variable INFORMIXDIR correctly and the PATH environment variable includes the path to the bin directory of the INFORMIXDIR directory ($INFORMIXDIR/bin on the UNIX™ operating system and %INFORMIXDIR%\bin in Windows™ environments).
For a complete description of INFORMIXDIR, see the HCL OneDB™ Guide to SQL: Reference or the HCL OneDB Client Products Installation Guide for your operating system.