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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®.
Create user-defined routines
Extend data typesThis section describes the ways to extend data types with C user-defined routines (UDRs).
Create an Opaque Data TypeThis section describes how to design and write an opaque data type.
Registering an opaque data typeThis section explains how to register an opaque data type.
Register opaque-type support functions

Register opaque-type support functions

To have the database server able to locate the opaque-type support functions, you must register them with the following actions:

Use the CREATE FUNCTION statement to register the opaque-type support functions as C UDRs.
For more information, see Register a C UDR.
Use the GRANT EXECUTE ON statement to grant the Execute privilege to the opaque-type support functions.
For more information, see Access privileges to run the UDR.
Use the GRANT USAGE ON LANGUAGE statement to ensure that users have the Usage privilege in the C language for UDRs.
For more information, see The UDR language.

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