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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 an opaque type in a databaseUse the CREATE OPAQUE TYPE statement to register an opaque data type in a database.

Register an opaque type in a database

Use the CREATE OPAQUE TYPE statement to register an opaque data type in a database.

For more information, see Determine internal representation. You can assign privileges to the opaque type with the GRANT USAGE ON TYPE statement. Type privileges for user-defined types (including opaque types) are stored in the sysxtdtypeauth system catalog table. By default, Usage privilege is granted to the person who registered the user-defined type. For more information about the syntax of the GRANT statement, see the Informix® Guide to SQL: Syntax.

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