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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-Table Interface GuideThe Informix® Virtual-Table Interface Programmer's Guide explains how to create a primary access method with the Virtual-Table Interface (VTI) so that users have a single SQL interface to HCL Informix® tables and to data that does not conform to the storage scheme of HCL Informix®.
Purpose-function referenceThese topics describe the purpose functions that the access-method developer provides.
Purpose-function syntaxThe database server expects a particular prototype for each purpose function. As the access-method developer, you program the actions of a purpose function but must use the parameters and return values that the Virtual-Table Interface (VTI) prototypes specify.
The am_drop purpose functionThe database server calls am_drop for a DROP TABLE or DROP DATABASE statement.

The am_drop purpose function

The database server calls am_drop for a DROP TABLE or DROP DATABASE statement.

Syntax

mi_integer am_drop(MI_AM_TABLE_DESC *tableDesc)

tableDesc: Points to the table descriptor.

Usage

Even if the access method provides no am_drop purpose function, the database server automatically removes the dropped object from the system catalog tables. The database server no longer recognizes the name of the dropped object.

Return values

MI_OK: Indicates success.
MI_ERROR: Indicates failure.

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