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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 the opaque-type casts

Register the opaque-type casts

Use the CREATE CAST statement to register the input, output, receive, send, import, export, importbin, and exportbin support functions as cast functions in the syscasts system catalog table. The input, receive, import, and importbin support functions must be registered as implicit casts. The output, send, export, and exportbin support functions must be registered as explicit casts. For more information, see Support functions as casts.

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