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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.
User-Defined Routines and Data Types Developer's GuideThe Informix® User-Defined Routines and Data Types Developer's Guide describes how to define new data types and enable user-defined routines (UDRs) to extend HCL Informix®.
Develop a user-defined routine
Write the routine

Write the routine

The source for an external routine resides in a separate text file. For information about C UDRs, refer to the Informix® DataBlade® API Programmer's Guide and the Informix DataBlade API Function Reference. For information about Java™ UDRs, refer to the J/Foundation Developer's Guide.

Because external-language routines are external to the database, you must compile the UDR source code and store it where the database server can access it when the routine is invoked. To prepare UDR source code:

Compile the C-language UDR and store the executable version in a shared-object file.
For information about how to create shared-object files, refer to the Informix DataBlade API Programmer's Guide.
Compile the Java-language UDR and store the executable version in a .jar file.
For information about how to prepare .jar files, refer to your Java documentation.

You must install shared object files and .jar files on all database servers that need to run the UDRs, including database servers involved in Enterprise Replication (ER) and High-Availability Data Replication (HDR). The shared object files and .jar files need to be installed under the same absolute path name.

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