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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
HCL OneDB™ librariesThese topics describe how to link the static, shared, and thread-safe HCL OneDB™ general libraries with your application.
Create thread-safe ESQL/C applications
Link thread-safe librariesThe esql command links the thread-safe versions of the static or shared HCL OneDB™ general libraries when you specify the -thread command-line option.
Linking thread-safe HCL OneDB™ general libraries to an ESQL/C module in a Windows™ environment

Linking thread-safe HCL OneDB general libraries to an ESQL/C module in a Windows environment

About this task

To create a thread-safe application, you must perform the following steps:

Procedure

In your source file, include the appropriate thread functions and variables of the Windows™ API.
For more information about threads, consult your Microsoft™ or Borland programmer documentation.
When you compile the source file, specify the -thread command-line option of the esql command.
The -thread option tells the preprocessor to generate thread-safe C code when it translates SQL and statements. This thread-safe code includes calls to thread-safe functions in the HCL OneDB™ DLLs.

What to do next

If you are not creating the application with threads, omit the -thread option. Although the HCL OneDB DLLs are thread safe, your non-thread-safe application does not use the thread-safe feature when you omit -thread.