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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
Access the ESQL Client-interface DLL in Windows™ environments
Build an application DLLYou can tell the processor to build the program as a DLL (.dll file) with the -target (or -wd) command-line option. Such a program is called an application DLL.

Build an application DLL

You can tell the processor to build the program as a DLL (.dll file) with the -target (or -wd) command-line option. Such a program is called an application DLL.

To build the program as a DLL, follow the guidelines for general-purpose DLLs. For more information, see your system documentation. Compile the source file with the -target:dll (or -wd) to create the application DLL.

For an example of how to build an application DLL, see the WDEMO demonstration program in the %INFORMIXDIR%\demo\wdemo directory. The source file for the sample application DLL is called wdll.ec. To compile this DLL, use the following esql command:

esql -subsystem:windows -target:dll wdll.ec

The source code for the WDEMO executable file is in the wdemo.exe file.