Home
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
Execute user-defined routinesThis section provides information about how to call a user-defined routine (UDR).
Access MI_FPARAM routine-state informationWhen the routine manager calls a UDR, it passes the routine-state information as an extra argument, called the function-parameter structure, to the routine. This function-parameter structure, MI_FPARAM, holds the routine-state information for the C UDR with which it is associated.
Saving a user stateThe routine manager provides information about arguments and return values of a UDR in the MI_FPARAM structure that is associated with a UDR. In addition, you can store the address of private-state information, called user-state information, in a special field of the MI_FPARAM structure.
Obtaining user-state information in subsequent invocations of the UDR

Obtaining user-state information in subsequent invocations of the UDR

About this task

To obtain user-state information in subsequent invocations of the UDR:

Procedure

Use the mi_fp_funcstate() function to retrieve the user-state pointer from the MI_FPARAM structure.
If the user-state pointer is not a NULL-valued pointer, cast the pointer to the data type of your user-state information.
After the user-state pointer points to the correct data type, you can access the user-state information.

Rate this topic

5 stars 4 stars 3 stars 2 stars 1 star

Comment on this topic.

By clicking this box, you acknowledge that you are NOT a U.S. Federal Government employee or agency, nor are you submitting information with respect to or on behalf of one. HCL provides software and services to U.S. Federal Government customers through its partners immixGroup, Inc. Contact this team at https://hcltechsw.com/resources/us-government-contact. Do not include any personal data in this Comment box.