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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.
Function descriptionsThis section gives comprehensive reference information about the functions that are valid within DataBlade® API modules. It lists the function descriptions in alphabetical order, with syntax, usage information, and return values for the functions.
The mi_trigger_get_old_row() functionThe mi_trigger_get_old_row() function returns the name of the old row value if the MI_TRIGGER_FOREACH_EVENT bit is set, which implies that the MI_TRIGGER_BEFORE_EVENT or the MI_TRIGGER_AFTER_EVENT bits are not set. In addition, mi_trigger_get_old_row() returns all the columns in the requested row, not just those columns into which data was explicitly inserted. Columns with default data are also returned.

The mi_trigger_get_old_row() function

The mi_trigger_get_old_row() function returns the name of the old row value if the MI_TRIGGER_FOREACH_EVENT bit is set, which implies that the MI_TRIGGER_BEFORE_EVENT or the MI_TRIGGER_AFTER_EVENT bits are not set. In addition, mi_trigger_get_old_row() returns all the columns in the requested row, not just those columns into which data was explicitly inserted. Columns with default data are also returned.

Syntax

MI_ROW *mi_trigger_get_old_row(void)


Valid in client LIBMI application?	Valid in user-defined routine?
No	Yes

Usage

For a DELETE or UPDATE statement, the mi_trigger_get_old_row() function returns the row that was deleted or the value of the row before it was updated. It returns NULL when called in other trigger action statements. This function can be called in SPL trigger functions and trigger procedures only within the triggered action list of the FOR EACH ROW clause in trigger definitions.

Return values

An MI_ROW pointer

A pointer to the old row.

NULL

The function was one of the following:

not successful.
not in the trigger action.
not in the FOR EACH row trigger.
not in one of the DELETE or UPDATE triggers.