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Extending HCL OneDB™Beyond standard relational database objects, HCL OneDB™ can be extended to handle specialized data types, access methods, routines, and other objects. HCL OneDB™ includes many built-in extensions that are fully integrated in the database server. HCL OneDB™ 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 HCL OneDB™.
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 HCL OneDB™ databases.
DataBlade® API Function ReferenceThe HCL OneDB™ DataBlade® API Function Reference describes the DataBlade® API functions and the subset of functions that the DataBlade® API supports.
Categories of DataBlade® API functionsThis section summarizes by categories the functions that the DataBlade® API provides. It divides functions that are valid within DataBlade® API modules into several functional categories and lists the functions within each category.
The DataBlade® API function libraryThis section lists the functions in the DataBlade® API function library by categories.
Exception handlingThe DataBlade® API provides routines for handling exceptions.

Exception handling

The DataBlade® API provides routines for handling exceptions.

Table 1. DataBlade API functions for handling exceptions
Function category	DataBlade API function
Raising a database exception	mi_db_error_raise()
Accessing an error descriptor	mi_errmsg() mi_error_desc_copy() mi_error_desc_destroy() mi_error_desc_finish() mi_error_desc_is_copy()	mi_error_desc_next() mi_error_level() mi_error_sqlcode() mi_error_sql_state()
Using callback functions	mi_default_callback() mi_disable_callback() mi_enable_callback()	mi_register_callback() mi_retrieve_callback() mi_unregister_callback()