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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 topics explain how to use HCL OneDB™ ESQL/C, the HCL OneDB™ implementation of Embedded Structured Query Language (SQL) for C (ESQL/C), to create client applications with database-management capabilities. The HCL® OneDB® ESQL/C Programmer's Manual explains how to use HCL OneDB™ ESQL/C, 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.
Optimized message transfersHCL OneDB™ ESQL/C provides a feature called optimized message transfers, which allow you to minimize message transfers with the database server for most HCL OneDB™ ESQL/C statements.
Enabling optimized message transfers

Enabling optimized message transfers

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To enable optimized message transfers, or message chaining, you must set the following variables in the client environment:

Set the OPTMSG environment variable at run time to enable optimized message transfers for all qualifying SQL statements.
Set the OptMsg global variable within the HCL OneDB™ ESQL/C application to control which SQL statements use message chaining.