Oracle pl sql trigger updating
CREATE or REPLACE TRIGGER emp_after_update AFTER UPDATE OF empid ON emp FOR EACH ROW DECLARE BEGIN update emp_backup set empid = :new.empid where empid = :old.empid; DBMS_OUTPUT.
PUT_LINE('empid successfully updated into emp_backup table'); END; The above trigger named ’emp_after_update’ will be initiated whenever ’empid’ column in ’emp’ table gets updated.
: New and : Old Value can be differentiated in DML Statements .
Insert -- : Old = NULL : New= Inserted new value Update -- : Old = Value present in table before the Update statement Triggered : New = Given new value to Update Delete -- : Old = Value before deletion : New = NULL CREATE OR REPLACE TRIGGER get_dept BEFORE DELETE OR INSERT OR UPDATE ON employees FOR EACH ROW BEGIN DBMS_OUTPUT.
I have read that using SERIAL not null on the Table column entry may eliminates the need for a sequence and referencing table, but I need that for my homework to work.
Item Delivered='True') Then Select Items Delivered into Counter From Customers where Customerd ID =: New. end if; END; Here is my problem, if only the Item Delivered column is updated there is no New. Is there any way to get the Customer ID of the row that have just updated? Thanks really much,i really appreciate the help:)create or replace Trigger Update Delivered After Update On Items For Each Row Begin If (: Old. Item Delivered='True') Then Update Customers set items Delivered = items Delivered 1 where customer ID = :new.customer ID; end if; END; That being said, however, storing this sort of counter and maintaining it with a trigger is generally a problematic way to design a data model.
PUT_LINE('Record successfully inserted into emp_backup table'); END; Second Problem: We want o update a record in the ’emp_backup’ table if a corresponding record is updated in the ’emp’ table.
As we’ve already created both the tables in above example, we will directly write a trigger for ‘AFTER UPDATE’.
Have a good time:) If you would like to store the item count in the database, I would recommend a pair of triggers.
You would use an after row trigger to record the item number (perhaps in a table variable in your package) and an after statement trigger that will actually update the counter, calculating the items delivered directly from the base date.
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It is having problems with my Bind Variables : NEW from the sequence, and also the idpay value inserted from another Table.