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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.
Virtual-Index Interface GuideThe Informix® Virtual-Index Interface Programmer's Guide explains how to create a secondary access method with the Virtual-Index Interface (VII) to extend the built-in indexing schemes of HCL Informix® typically with a DataBlade® module.
Design decisionsThese topics present the choices that you make to optimize the performance and flexibility of the access method that you can create with the virtual-index interface (VII).
Using FastPath
Obtaining the routine identifierYou can obtain the routine identifier for a strategy function directly from the qualification descriptor that the database server passes to the access method.

Obtaining the routine identifier

You can obtain the routine identifier for a strategy function directly from the qualification descriptor that the database server passes to the access method.

About this task

Call mi_qual_funcid(). Because the database server does not provide the routine identifier for a support function directly in a descriptor, use the following procedure to identify the support function for FastPath execution.

To obtain the routine identifier for a support function:

Procedure

Use mi_tab_keydesc() to extract the key descriptor from the table descriptor.
Use mi_key_opclass_nsupt() to determine the number of support functions that the access method must look up.
Use mi_key_opclass_supt() to determine each support-function name and then assemble a function prototype with a statement similar to the following example:
```
sprintf(prototype, "%s(%s,%s)", 
      function_name, key_data_type, key_data_type);
```
Use DataBlade® API FastPath function mi_routine_get() to look up the function descriptor.

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