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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.
The xa_start() functionIn each transaction, when an XA data source registers statically with the HCL Informix® transaction, HCL Informix® runs the xa_start() function.

The xa_start() function

In each transaction, when an XA data source registers statically with the HCL Informix® transaction, HCL Informix runs the xa_start() function.

The syntax for the function is:

mint xa_start(XID *xid,   /* IN */
           mint rmid,     /* IN */
           int4 flags)   /* IN */

Table 1. The xa_start() parameters
Parameter	Description
xid	Pointer to the XID data structure that is defined in the xa.h file and used for the current transaction
rmid	Unique resource manager identifier
flags	`TMNOFLAGS`, which is the valid value

For valid return values, refer to X/Open information, including Distributed Transaction Processing: The XA Specification.

Currently, HCL Informix does not call the xa_start() function because the XA data source must be created with the TMREGISTER flag.

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