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Trigger Information

You can create user-defined routines that are invoked in trigger action statements to obtain information about the triggers, triggering tables, views, statements, and the values of rows involved in the trigger actions. To create such a reporting routine, use the DataBlade APIs described below. Using these DataBlade APIs, you can write a general purpose user-defined routine that you can use to audit any table and any trigger event.

DataBlade API Function Purpose
mi_trigger_event( )

Returns the value derived from an OR operation from the following events. These values are defined in the milib.h file.

  • MI_TRIGGER_NOT_IN_EVENT
  • MI_TRIGGER_INSERT_EVENT
  • MI_TRIGGER_DELETE_EVENT
  • MI_TRIGGER_UPDATE_EVENT
  • MI_TRIGGER_SELECT_EVENT
  • MI_TRIGGER_BEFORE_EVENT
  • MI_TRIGGER_AFTER_EVENT
  • MI_TRIGGER_FOREACH_EVENT
  • MI_TRIGGER_INSTEAD_EVENT
  • MI_TRIGGER_REMOTE_EVENT

Each bit set in the returned value indicates the type of trigger currently executing. These definitions are in the public header file. The returned value is combined with these values to determine the current event. If the UDR is not currently executing, it returns MI_TRIGGER_NOT_IN_EVENT.
mi_trigger_get_new_row( ) Returns the new row being inserted or the updated value of the row. It returns NULL when called in other trigger action statements.
mi_trigger_get_old_row( ) 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.
mi_trigger_level( ) Returns the nesting level of the current trigger. The values returned begin at 1 and increment by 1 for each nesting level, with a maximum of 61 levels.
mi_trigger_name( ) Returns the name of the currently executing trigger in the format ownername.triggername.
mi_trigger_tabname( ) Returns the triggering table or view name.

For the syntax of these functions and for more information about their purposes, see the IBM Informix: DataBlade API Function Reference.

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