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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.
Write a UDR in CYou can write a UDR in C by using the DataBlade® API functions to communicate with the database server. You can also write subroutines in C that a UDR calls as it executes. These subroutines must follow the same rules as the UDR with respect to the use of DataBlade® API functions.

Write a UDR in C

You can write a UDR in C by using the DataBlade® API functions to communicate with the database server. You can also write subroutines in C that a UDR calls as it executes. These subroutines must follow the same rules as the UDR with respect to the use of DataBlade API functions.

Tip: Because of the subject matter of these topics, the topics use the terms C UDR and UDR interchangeably.

You compile UDRs into shared-object files. You then register the UDR in the system catalog tables so that the database server can locate the code at run time. The database server dynamically loads the shared-object files into memory when the UDR executes.

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