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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.
The DataBlade® API moduleA DataBlade® API module is a C-language module that uses the functions of the DataBlade® API to communicate with HCL Informix®.
User-defined routine (Server)A user-defined routine (UDR) is a routine that you can start within an SQL statement or another UDR. UDRs are building blocks for the development of DataBlade® modules.

User-defined routine (Server)

A user-defined routine (UDR) is a routine that you can start within an SQL statement or another UDR. UDRs are building blocks for the development of DataBlade® modules.

Possible uses for a UDR are:

Support function for an opaque data type
Cast function to cast data from one data type to another
End-user routine for use in SQL statements
Operator function to implement an operation on a particular data type

When you write a UDR in an external language (a language other than SPL), the UDR is called an external routine. An external routine that is written in the C language is called a C UDR. A C UDR uses the server-side implementation of the DataBlade API to communicate with the database server.

For general information about UDRs, see the Informix® User-Defined Routines and Data Types Developer's Guide.

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