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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
Declare a host variableYou must define the data storage that a host variable needs before you can use that variable in Informix® ESQL/C programs. To assign an identifier to the variable and associate it with a data type, you declare the variable.
Host-variable data typesBecause a host variable is a C variable, you must assign a C data type to the variable when you declare it. Likewise, when you use a host variable in an SQL statement, you also associate it with an SQL data type.

Host-variable data types

Because a host variable is a C variable, you must assign a C data type to the variable when you declare it. Likewise, when you use a host variable in an SQL statement, you also associate it with an SQL data type.

For more information about the relationship between SQL data types and C data types, see Informix ESQL/C data types. In addition, the Informix Guide to SQL: Reference contains information about the SQL data types.

You can also declare host variables as many of the more complex C data types, such as pointers, structures, typedef expressions, and function parameters. For more information, see Host variables in data structures.

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