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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 extensions
You 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 Guide
The 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® API
The 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 components
The DataBlade® API contains the header files, public data type structures, and pubic functions for the development of DataBlade API modules.
Header files

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.
- Informix® extensions and DataBlade® modules
  These topics describe how to use built-in database extensions and separately installed DataBlade® modules.
- Creating extensions
  You 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 Guide
    The 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® API
        The 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.
        The DataBlade® API module
        A DataBlade® API module is a C-language module that uses the functions of the DataBlade API to communicate with HCL Informix®.
        DataBlade® API components
        The DataBlade® API contains the header files, public data type structures, and pubic functions for the development of DataBlade API modules.
        Header files
        DataBlade® API header files
        The DataBlade® API header files begin with the mi prefix. The DataBlade API provides public header files for use in DataBlade API modules.
        ESQL/C header files
        Header files are provided to support some of the functions and data types of the Informix® ESQL/C library.
        Informix® GLS header file
        A header file is provided to support the library. If you use the library in your DataBlade® API module, include its header file, ifxgls.h, in your source code.
        Private header files
        If you define any opaque data types, you must include their header file in your DataBlade® API source code. An opaque-type header file usually contains the declaration of the internal format for the opaque data type.
        Public data types
        Regular public functions
        The DataBlade® API provides support for the functions in a DataBlade API module.
        Advanced features (Server)
        The DataBlade® API provides a set of advanced features to handle specialized needs of a UDR or DataBlade module that the regular public features cannot handle.
        Internationalization of DataBlade® API modules (GLS)
        For your DataBlade® API module to work in any HCL Informix® locale, you must implement your DataBlade API module so that it is internationalized. That is, the module must not make any assumptions about the locale in which it will execute.
      - Access SQL data types
        This section provides an overview of the data types that the DataBlade® API supports.
    - Data manipulation
    - Database access
    - Create user-defined routines
    - Appendix
      This section contains additional reference information.
  - DataBlade® API Function Reference
    The Informix® DataBlade® API Function Reference describes the DataBlade API functions and the subset of Informix ESQL/C functions that the DataBlade API supports.
  - DataBlade® Developers Kit
    The DataBlade® Developers Kit (DBDK) guides contain information about the tools you can use to develop and package DataBlade modules, which extend the functionality of HCL Informix® databases.
  - J/Foundation Developer's Guide
    The J/Foundation Developer's Guide describes how to write user-defined routines (UDRs) in the Java™ programming language for Informix®.
  - R-Tree Index User's Guide
    The Informix® R-Tree Index User's Guide describes the HCL Informix R-tree secondary access method and how to access and use its components.
  - User-Defined Routines and Data Types Developer's Guide
    The Informix® User-Defined Routines and Data Types Developer's Guide describes how to define new data types and enable user-defined routines (UDRs) to extend HCL Informix.
  - Virtual-Table Interface Guide
    The Informix® Virtual-Table Interface Programmer's Guide explains how to create a primary access method with the Virtual-Table Interface (VTI) so that users have a single SQL interface to HCL Informix tables and to data that does not conform to the storage scheme of HCL Informix.
  - Virtual-Index Interface Guide
    The Informix® Virtual-Index Interface Programmer's Guide explains how to create a secondary access method with the Virtual-Index Interface (VII) to extend the built-in indexing schemes of HCL Informix typically with a DataBlade® module.

Header files

The following categories of header files are provided for use in a DataBlade® API module:

DataBlade® API header files that define the DataBlade® API data types and functions.
Informix® ESQL/C header files define that the Informix® ESQL/C library functions and data types.
The header file provides the ability to internationalize your DataBlade® API module.
Private header files, which you create, can support the DataBlade® API module.