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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.
J/Foundation Developer's GuideThe J/Foundation Developer's Guide describes how to write user-defined routines (UDRs) in the Java™ programming language for Informix®.
Opaque user-defined data typesThis section describes how to use opaque user-defined data types (UDTs). This section describes the default SQLData interface and how to override the default.
Using the SQLData interfaceTo implement a complete UDT in Java™ code, you must supply a set of data-formatting methods that convert to and from the various representations of the data type. These methods perform input and output operations for the data type such as converting text input to the internal structure that the database server uses.
Informix® extensions to SQLInput and SQLOutput

Informix extensions to SQLInput and SQLOutput

Some of the standard SQLInput and SQLOutput Stream methods need an additional length argument to read or write an opaque data type because the Informix® JDBC Driver cannot determine the field lengths for an opaque type. Informix database server provides the IfmxUDTSQLInput and IfmxUDTSQLOutput extensions, which inherit from the standard Informix JDBC Driver 2.0 SQLInput and SQLOutput interfaces.

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