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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
Register and unregister XA-compliant data sourcesAfter you create an external XA-compliant data source, transactions can register data source using the mi_xa_register_xadatasource() or ax_reg() functions. You can also unregister the data source using the mi_xa_unregister_xadatasource() or ax_unreg() functions.

Register and unregister XA-compliant data sources

After you create an external XA-compliant data source, transactions can register data source using the mi_xa_register_xadatasource() or ax_reg() functions. You can also unregister the data source using the mi_xa_unregister_xadatasource() or ax_unreg() functions.

The mi_xa_register_xadatasource() function and the ax_reg() function both register XA-compliant, external data sources. However, these functions use different parameters and have different return values.

Similarly, the mi_xa_unregister_xadatasource() and ax_unreg() functions perform the same operation, but use different parameters and have different return values.

Unlike SQL CREATE operations, which create entries in system catalog tables, registration is transient, lasting only for the duration of the transaction. A transaction must be started, implicitly or explicitly, before the application can register the XA data source.

In a distributed environment, you must register a data source using the local coordinator server.

Multiple registrations of the same XA data source in a transaction have the same effect as a single registration. HCL Informix® does not maintain a count of the number of times an application has registered. A single call to ax_unreg() or mi_xa_unregister_xadatasource() unregisters the data source from the transaction.

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