Trigger to prevent the update

I want to create the trigger that will prevent illegal updates, but for illegal data, I want to insert into another table. In order to avoid the update, I have to make an exception, but it will insert is rollback. I am aware of the autonomous transactions (put I insert a procedure which is autonomous transactions) but it seems to me like dirty way to solve the problem. Y at - it another way to prevent the update that does not throw exception. I am also against the update on the same values. Thank you!

FilipFry wrote:
I checked the book, so now I am on the departure, how preventing the update in the after trigger without triggering an exception?

The only way to prevent a updated row in a trigger would throw an exception.
You may, of course, update leave unchanged data simply by setting the new value for each column in the old value, i.e.

CREATE OR REPLACE TRIGGER some_trigger
  BEFORE UPDATE ON some_table
  FOR EACH ROW
BEGIN
  IF( some_condition )
  THEN
    :new.column1 := :old.column1;
    :new.column2 := :old.column2;
    ...
    :new.columnN := :old.columnN;
  END IF;
END;

This is far from ideal from the point of view redo generation and from a perspective of maintainability, but it would prevent the change of location data.

Another trigger approach would be to create a view on the table, create an INSTEAD OF trigger on the view and then publish your updates against the view. The INSTEAD OF trigger can determine to apply changes to the base table or not, whether to discard the changes or if you want to record changes in another table.

Justin

Tags: Database

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