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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®.
DataBlade® API overview
The DataBlade® APIThe HCL Informix® DataBlade® API is the application programming interface (API) for HCL Informix®. You can use DataBlade® API functions in DataBlade® modules to access data stored in the Informix® database.
DataBlade® API componentsThe DataBlade® API contains the header files, public data type structures, and pubic functions for the development of DataBlade® API modules.
Regular public functionsThe DataBlade® API provides support for the functions in a DataBlade® API module.
Informix® ESQL/C functionsIn a DataBlade® API module, you can use some of the functions in the Informix® ESQL/C library functions to perform conversions and operations on different data types. The Informix® ESQL/C functions do not begin with the mi_ prefix. Various header files declare these functions.

Informix ESQL/C functions

In a DataBlade® API module, you can use some of the functions in the Informix® ESQL/C library functions to perform conversions and operations on different data types. The Informix ESQL/C functions do not begin with the mi_ prefix. Various header files declare these functions.

For more information, see ESQL/C header files.

The functions of the Informix ESQL/C function library that are valid in a DataBlade API module can be divided into the following categories.


Category of DataBlade API function	More information
Byte handling	Manipulate byte data
Character processing	ESQL/C functions for string conversion Operations on character values
DECIMAL-type and MONEY-type processing	ESQL/C functions for decimal conversion Perform operations on decimal data
DATE-type processing	ESQL/C functions for date conversion Operations on date data
DATETIME-type processing and INTERVAL-type processing	ESQL/C functions for date, time, and interval conversion Operations on date and time data
INT8-byte processing	Convert INT8 values Perform operations on eight-byte values
Processing for other C-language data types	Format numeric strings

For a complete list of Informix ESQL/C functions in each of these categories, see the Informix DataBlade API Function Reference, which provides descriptions of these public functions, in alphabetical order.

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