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Extending Informix®Beyond standard relational database objects, HCL Informix® can be extended to handle specialized data types, access methods, routines, and other objects. Informix® includes many built-in extensions that are fully integrated in the database server. Informix® also provides DataBlade® modules, which are packages of extended database objects for a particular purpose and that are installed separately from the database server. Alternatively, you can create your own user-defined objects for Informix®.
Creating extensionsYou can create user-defined data types, routines, access methods, and other database objects to suit your needs. You can use application programming interfaces to write user-defined routines and applications that access data in Informix® databases.
DataBlade® API Programmer's GuideThe Informix® DataBlade® API Programmer's Guide describes information about the DataBlade® API, the C-language application programming interface (API) provided with HCL Informix®.
Data manipulation
Numeric data typesThis section describes these numeric data types and the functions that the DataBlade® API supports to process numeric data.
Fixed-point dataFixed-point data is a decimal value with a fixed number of digits to the right and left of the decimal point. The fixed number of digits to the right of the decimal point is called the scale of the value. The total number of digits in the fixed-point value is called the precision of the value.
Fixed-point binary representations
The decimal.h header fileThe decimal.h header file contains definitions for use with the DECIMAL and MONEY data types.

The decimal.h header file

The decimal.h header file contains definitions for use with the DECIMAL and MONEY data types.

This header file defines the following items:

The dec_t typedef
The decimal macros
The DECIMAL-type functions of the Informix® ESQL/C library

The mitypes.h header file automatically includes decimal.h. In turn, the milib.h header file automatically includes mitypes.h, and mi.h automatically includes milib.h. Therefore, you automatically have access to the dec_t structure, the mi_decimal and mi_money data types, any of the decimal macros, or any of the Informix ESQL/C DECIMAL-type functions when you include mi.h in your DataBlade® API module.

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