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DML Trigger Conditional Predicates: INSERTING, UPDATING, DELETINGCREATE TRIGGER statement (PL/SQL)

29.10.2018

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If inserting or updating then

Runtime that trigger errors always cause the DML statement to fail. You may need to set up the following data structures for this example to work: In these scenarios, only the trigger action is rolled back. The previous example exception statement cannot run, because the trigger does not complete compilation. It can be hard to track code dependencies when using triggers. This can become a little awkward when you have a parent-child relationship and a trigger on the parent table needs to execute some DML on the child table. In addition, the after statement trigger displays the contents of the collection and empties it. Oracle Database Concepts for information about the interaction of triggers and integrity constraints Because declarative referential integrity constraints are not supported between tables on different nodes of a distributed database, the mutating table restrictions do not apply to triggers that access remote nodes. With this privilege, the trigger can be created in any schema and can be associated with any user's table. If inserting or updating then

If inserting or updating then





If inserting or updating then





If inserting or updating then





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3 thoughts on “Non-DML (Event) Triggers

  1. Depending on the type of triggering statement, certain correlation names might not have any meaning. If the after statement trigger was responsible for anything important, like cleaning up the contents of the collection, we are in trouble. Runtime that trigger errors always cause the DML statement to fail.

  2. These statements are run if the triggering statement is entered and if the trigger restriction if included evaluates to TRUE. Spreading functionality throughout several triggers can make it difficult for developers to see what is really going on when they are coding, since their simple insert statement may actually be triggering a large cascade of operations without their knowledge. See example below.

  3. Oracle allows you to have multiple triggers defined for a single timing point, but it doesn't guarantee execution order unless you use the FOLLOWS clause available in Oracle 11g, described here.

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