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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
Overview of integrating XA-compliant data sources in transactionsThe transaction manager, which is an integral part of the database server, not a separate module, can invoke support routines for each XA-compliant, external data source that participates in a distributed transaction at a particular transactional event, such as prepare, commit, or rollback. This interaction conforms to X/Open XA interface standards.
Infrastructure for creating support routines for XA routines

Infrastructure for creating support routines for XA routines

The interaction between the transaction manager and an XA data source occurs through a set of XA-support purpose functions, such as xa_open(), xa_close(), xa_start(), xa_end(), xa_prepare(), xa_commit(), xa_rollback(), xa_forget(), xa_recover(), and xa_complete(). These UDRs contain XA data source information and operate for the global transaction ID, which is passed as a parameter to a UDR.

The support routines must exist in every database in which the application creates XA data source types and their instances. You must create these UDRs before creating XA-compliant data source types.

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