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To introduce triggers, this chapter discussed the following
topics:
- The purpose of each component of the CREATE TRIGGER statement
- How to create BEFORE and AFTER triggered
actions and how to use them to determine the impact of the triggering
statement
- How to create a FOR EACH ROW triggered
action and how to use the REFERENCING clause
to refer to the values of columns both before and after the action
of the triggering statement
- The advantages of using SPL routines
as triggered actions
- How to trace triggered actions if they behave unexpectedly
- How to generate two types of error messages within a triggered
action
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