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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.
Floating-point dataA floating-point value is a large decimal value that is stored in a fixed field width. Because the field width is fixed, a floating-point number that is larger than the field width only retains its most significant digits. That is, digits that do not fit into the fixed width are dropped (rounded or truncated).
Floating-point text representation

Floating-point text representation

The DataBlade® API supports a floating-point value in text representation as a quoted string that contains the following characters.


Contents of integer string	Character
Digits	0–9
Thousands separator: symbol between every three digits	, (comma)
Decimal separator: symbol between the integer and fraction portions of the number	. (period)

For example, the following integer string contains the value for 1,345.77431:

"1,345.77431"

In a floating-point string, the thousands separator is optional.

Important: Because floating-point numbers retain only their most significant digits, the number that you enter in this type of column and the number the database server displays can differ slightly.

A locale defines the end-user format for numeric values. The end-user format is the format in which data appears in a client application when the data is a literal string or character variable. The preceding floating-point string is the end-user format for the default locale, US English. A nondefault locale can define an end-user format that is particular to a country or culture outside the US. For more information, see the Informix® GLS User's Guide.

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