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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.
Descriptor function reference
Accessor functionsThe Virtual-Index Interface (VII) library contains functions that primarily access selected fields from the various descriptors.
The mi_tab_isolevel() accessor functionThe mi_tab_isolevel() function retrieves the isolation level that the SET ISOLATION or SET TRANSACTION statement applies.

The mi_tab_isolevel() accessor function

The mi_tab_isolevel() function retrieves the isolation level that the SET ISOLATION or SET TRANSACTION statement applies.

Syntax

MI_ISOLATION_LEVEL mi_tab_isolevel(MI_AM_TAB_DESC *tableDesc)

tableDesc: Points to the table descriptor.

Usage

If the access method supports isolation levels, it can call mi_tab_isolevel() to validate that the isolation level requested by the application does not surpass the isolation level that the access method supports. If the access method supports Serializable, it does not call mi_tab_isolevel() because Serializable includes the capabilities of all the other levels.

Return values

MI_ISO_NOTRANSACTION: Indicates that no transaction is in progress.
MI_ISO_READUNCOMMITTED: Indicates Dirty Read.
MI_ISO_READCOMMITTED: Indicates Read Committed.
MI_ISO_CURSORSTABILITY: Indicates Cursor Stability.
MI_ISO_REPEATABLEREAD: Indicates Repeatable Read.
MI_ISO_SERIALIZABLE: Indicates Serializable.

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