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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 macros

The decimal macros

The decimal.h header file also includes the following macros that might be useful in a DataBlade® API module.


Decimal macro	Description
DECLEN(p, s)	Calculates the minimum number of bytes required to hold the DECIMAL(p,s) value
DECPREC(size)	Calculates a default precision given the number of bytes (size) used to store the number
PRECTOT(dec)	Returns the total precision of the dec value
PRECDEC(dec)	Returns the scale of the dec value
PRECMAKE(p, s)	Creates a precision value from the specified total precision (p) and scale (s) For a complete list of decimal macros, consult the decimal.h header file that is installed with your database server. This header file is in the incl/public subdirectory of the INFORMIXDIR directory.

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