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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®.
Database access
XA-compliant external data sources
Create user-defined XA-support routinesYou can create user-defined XA-support routines, such as xa_open(), xa_start(), xa_prepare(), xa_rollback(), xa_commit(), xa_recover(), xa_complete(), xa_forget(), xa_close(), and xa_end(). These purpose functions are used for transaction management.

Create user-defined XA-support routines

You can create user-defined XA-support routines, such as xa_open(), xa_start(), xa_prepare(), xa_rollback(), xa_commit(), xa_recover(), xa_complete(), xa_forget(), xa_close(), and xa_end(). These purpose functions are used for transaction management.

You use these functions when you create XA data source types for external XA-compliant data sources.

Important: Even though HCL Informix® does not call all of the routines described in this section, you must have the routines to use as parameters when you create an XA data source type. In the CREATE XADATASOURCE TYPE statement, all of the parameters are mandatory.

There is no reason to run these functions directly from SQL or from user-defined routines.

The functions that you create must follow X/Open XA standards.

Important: You cannot drop an XA support user-defined routine until all of the XA data source types that use the support function are dropped.

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