ESQL/C header files

When you install Informix® ESQL/C, the installation script stores the header files in the $INFORMIXDIR/incl/esql directory on a UNIX™ operating system and in the %INFORMIXDIR%\incl\esql directory in a Windows™ environment.

The following table shows the header files provided with the Informix® ESQL/C product.

Table 1. ESQL/C header files
Header file	Contains	Additional information
datetime.h	Definitions of the Informix® ESQL/C datetime and interval structures, which are the host variables for DATETIME and INTERVAL columns	Time data types
decimal.h	Definition of the Informix® ESQL/C decimal data type, which is the host variable for DECIMAL and MONEY data types	Numeric data types
gls.h	Function prototypes and data structures for the GLS functionality	Informix® GLS User's Guide
ifxtypes.h	Correctly maps the Informix® data types int1, int2, int4, mint, mlong, MSHORT, and MCHAR for 32-bit and 64-bit platforms	The integer host variable types
locator.h	Definition of the Informix® ESQL/C locator structure (ifx_loc_t or loc_t), which is the host variable for byte and text columns	Simple large objects
sqlca.h	Definition of the structure that ESQL/C uses to store error-status codes The esql preprocessor automatically includes this file when it preprocesses your program.	Exception handling
sqlda.h	Structure definition for value pointers and descriptions of dynamically defined variables	Determine SQL statements
sqlhdr.h	This file includes the sqlda.h header file, other header files, and function prototypes. The preprocessor automatically includes this file when it preprocesses your program.	Header files included in your program
sqliapi.h	Function prototypes for internal library APIs For internal Informix® ESQL/C use only.	None
sqlstype.h	Definitions of constants for SQL statements The DESCRIBE statement uses these constants to describe a dynamically prepared SQL statement.	Determine SQL statements
sqltypes.h	Defines constants that correspond to ESQL/C and SQL data types ESQL/C uses these constants when your program contains a DESCRIBE statement.	Data type constants
sqlxtype.h	Defines constants that correspond to Informix® ESQL/C and SQL data types when you are in X/Open mode ESQL/C uses these constants when your program contains a DESCRIBE statement.	X/Open data type constants
value.h	Value structures that Informix® ESQL/C uses For internal Informix® ESQL/C use only.	None
varchar.h	Macros that you can use with the VARCHAR data type	Character and string data types

The following figure shows the Informix® ESQL/C header files specific to HCL Informix®.

Table 2. ESQL/C header files for HCL Informix®
Header file	Contents	Additional information
collct.h	Definitions of data structures for complex types in Informix® ESQL/C	Complex data types
ifxgls.h	Function prototypes for the GLS application programming interface For internal Informix® ESQL/C use only.	None
int8.h	Definition of the structure that stores the INT8 data type	The int8 data type

The following table shows the Informix® ESQL/C header files specific to Windows™ environments.

Table 3. ESQL/C header files for Windows™ environments
Header file	Contents	Additional information
sqlproto.h	Function prototypes of all ESQL/C library functions for use with source that is not fully ANSI C compliant	Declare function prototypes
infxcexp.c	Contains the C code to export the addresses of all C runtime routines that the ESQL client-interface DLL uses	Same runtime routines for version independence
login.h	The definition of the InetLogin and HostInfoStruct structures, which enable you to customize configuration information for the application Because this file does not contain ESQL statements, you do not need to include it with the ESQL include directive. Use instead the C #include preprocessor directive.	Fields of the InetLogin structure