Inserting updating deleting trigger events

13-Jun-2015 07:49 by 5 Comments

Inserting updating deleting trigger events

For more information about the column list, see " CREATE OR REPLACE TRIGGER log_salary_increase AFTER UPDATE OF salary ON employees FOR EACH ROW BEGIN INSERT INTO Emp_log (Emp_id, Log_date, New_salary, Action) VALUES (: NEW.employee_id, SYSDATE, : NEW.salary, 'New Salary'); END; / DECLARE sal_diff NUMBER; BEGIN sal_diff := : NEW.salary - : OLD.salary; DBMS_OUTPUT. PUT('Old salary = ' || : OLD.salary || ', '); DBMS_OUTPUT.PUT('New salary = ' || : NEW.salary || ', '); DBMS_OUTPUT.

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You might omit this clause if you just want to record the fact that the operation occurred, but not examine the data for each row.A column list cannot be specified for statement trigger is fired again.The rollback to savepoint does not undo changes to any package variables referenced in the trigger.Oracle strongly recommends that you use triggers to constrain data input only in these situations: created on a table or editioning view can fire at one, some, or all of the preceding timing points.Compound DML triggers help program an approach where you want the actions that you implement for the various timing points to share common data. A simple or compound DML trigger that fires at row level can access the data in the row that it is processing.If a triggering statement includes a column list, the trigger is fired only when one of the specified columns is updated.

If a triggering statement omits a column list, the trigger is fired when any column of the associated table is updated. This statement can be used with any interactive tool, such as SQL*Plus or Enterprise Manager.When using an interactive tool, a single slash (/) on the last line is necessary to activate the 0) DECLARE sal_diff number; BEGIN sal_diff := :- :old.sal; dbms_output.put('Old salary: '

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