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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 binary representationsThe DataBlade® API provides data types to support the binary representations of floating-point values.
The FLOAT data typeThe SQL FLOAT data type can hold double-precision floating-point values. The DataBlade® API supports the FLOAT data type with the mi_double_precision data type. The mi_double_precision data type stores internal FLOAT values, as 64-bit floating-point values.

The FLOAT data type

The SQL FLOAT data type can hold double-precision floating-point values. The DataBlade® API supports the FLOAT data type with the mi_double_precision data type. The mi_double_precision data type stores internal FLOAT values, as 64-bit floating-point values.

Values of the mi_double_precision data type cannot fit into an MI_DATUM structure. They must be passed by reference within C UDRs.

All data types, including mi_double_precision, must be passed by reference within client LIBMI applications.

Important: To make your DataBlade API module portable across different architectures, it is recommended that you use the DataBlade API data type, mi_double_precision, instead of the native C-language counterpart, double. The mi_double_precision data type handles the different sizes of large floating-point values across computer architectures.

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