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Client APIs and toolsYou can use the HCL Informix® implementation of client APIs to develop applications for Informix® database servers.
ESQL/C GuideThe Informix® ESQL/C Programmer's Manual explains how to use Informix® ESQL/C, the Informix® implementation of Embedded Structured Query Language (SQL) for C (ESQL/C), to create client applications with database-management capabilities.
What is Informix® ESQL/C?
Informix® ESQL/C programming
Declaring and using host variables
Host variable information

Host variable information

You can use host variables to contain the following types of information:

SQL identifiers: SQL identifiers include names of parts of the database such as tables, columns, indexes, and views.
Data: Data is information that the database server fetches from or stores in the database. This information can include null values. A null value indicates that the value of the column or variable is unknown.

Host variables can be displayed within an SQL statement as syntax allows. (For information about the syntax of SQL statements, see the Informix® Guide to SQL: Syntax.) However, you must precede the host-variable name with a symbol to distinguish it from regular C variables.

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