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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?
Character and string data typesThese topics explain how to use character data types in the HCL® OneDB® ESQL/C program.
Character data types supports five data types that can hold character data that you retrieve from and send to the database.
The lvarchar data typeThe lvarchar data type is the data type that holds character data of varying lengths.
The lvarchar pointer host variable

The lvarchar pointer host variable

When the lvarchar host variable is a pointer, the size of the data that the pointer references can range up to 2 GB. The lvarchar pointer host variable is designed to insert or select user-defined or opaque types that can be represented in a character string format.

You must use the ifx_var() functions to manipulate a lvarchar pointer host variable.