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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
Execute user-defined routinesThis section provides information about how to call a user-defined routine (UDR).
Call UDRs with the Fastpath interfaceWith the DataBlade® API Fastpath interface, DataBlade® API modules can directly invoke a UDR that was registered in the database. This interface bypasses the overhead associated with invoking a UDR through an SQL statement. This interface bypasses the query optimizer and executor, which are needed for an SQL statement. You can use this interface to execute any SQL routine.
Obtain information from a function descriptor
Determine if a function is a commutator functionBefore you execute a user-defined function with the Fastpath interface, you might want to determine whether this function has a commutator function.

Determine if a function is a commutator function

Before you execute a user-defined function with the Fastpath interface, you might want to determine whether this function has a commutator function.

If a user-defined function has either of the following characteristics, it is a commutator of another user-defined function:

A user-defined function takes the same arguments as another user-defined function, but in opposite order.
A user-defined function returns the same result as another user-defined function.

In many cases, a commutator function can be more efficient to execute than the actual user-defined function.

To determine whether a user-defined function has a commutator function, pass its function descriptor to the mi_func_commutator() function. This function determines whether the user-defined function associated with this function descriptor was registered with the COMMUTATOR routine modifier of the CREATE FUNCTION statement. If so, mi_func_commutator() returns the name of the commutator function (from the commutator column of the sysprocedures system catalog table). If the commutator is more efficient, you can use this function name to obtain a function descriptor for the commutator function with a Fastpath function such as mi_routine_get().

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