Trying to create a trigger that will update a clob field to rtrim hard returns the application is tossing in.
Cannot get to the application code, so I see no other way to make potentially needed changes to the data with a trigger.
The returns are not always added.
This code is throwing error ....
Inconsistent data type expected got clob.
I thought declaring the field would avoid the issue... but no...
Any help or suggestions greatly appreciated.
CREATE OR REPLACE TRIGGER AI_master_set
AFTER INSERT ON base1
REFERENCING NEW AS NEW OLD AS OLD
FOR EACH ROW
DECLARE
master_set CLOB;
BEGIN
UPDATE base1
set master_set= rtrim(master_set,chr(00))
WHERE master_set = :new.master_set;
:new.master_set:= master_set;
END;
Based on the horse with no name, and on Oracle (11g) compound trigger not updating CLOB data field, this should simply work:
CREATE OR REPLACE TRIGGER AI_master_set
before INSERT ON base1
REFERENCING NEW AS NEW OLD AS OLD
FOR EACH ROW
DECLARE
tmp_master_set CLOB;
BEGIN
tmp_master_set := rtrim(:new.master_set,chr(00));
:new.master_set:= tmp_master_set ;
END;
/
Hope it helps.
Related
create or replace NONEDITIONABLE TRIGGER SumUpdate AFTER INSERT ON stavkaotpremnice FOR EACH ROW
declare pragma autonomous_transaction;
begin
UPDATE otpremnica a
set a.ukupno=
(SELECT SUM(ukupno)
FROM stavkaotpremnice
WHERE brojotpremnice =: new.brojotpremnice)
WHERE a.brojotpremnice = :new.brojotpremnice;
commit;
end;
This trigger is to sum values of a column called "ukupno" in table stavakaotpremnice then store it in another table otpremnica in a column also called "ukupno".
The trigger check if the id(brojotpremnice) is the same and make the sum.
Brojotpremnice is a foreign key from table otpremnica.
Does anyone know why it is totally ignoring the first entry?
If i put rows in stavkaotpremnica i just count the first entry.
This type of problem can be solved via incremental addition as follows:
UPDATE otpremnica a
set a.ukupno = a.ukupno + :new.ukupno
WHERE a.brojotpremnice = :new.brojotpremnice;
Also, please read about pragma autonomous_transaction. Why it is used? Intentional? If you have no idea, read it. (It separates the transaction)
I get an error (ORA-04091: table DBPROJEKT_AKTIENDEPOT.AKTIE is mutating, trigger/function may not see it) when executing my trigger:
CREATE OR REPLACE TRIGGER Aktien_Bilanz_Berechnung
AFTER
INSERT OR UPDATE OF TAGESKURS
OR INSERT OR UPDATE OF WERT_BEIM_EINKAUF
ON AKTIE
FOR EACH ROW
DECLARE
bfr number;
Begin
bfr := :new.TAGESKURS - :new.WERT_BEIM_EINKAUF;
UPDATE AKTIE
SET BILANZ = TAGESKURS - WERT_BEIM_EINKAUF;
IF bfr < -50
THEN
DBMS_OUTPUT.PUT_LINE('ACHTUNG: The value (Nr: '||:new.AKTIEN_NR||') is very low!');
END IF;
END;
I want to check the value "BILANZ" after calculating it, wether it is under -50.
Do you have any idea why this error is thrown?
Thanks for any help!
There are several issues here:
Oracle does not allow you to perform a SELECT/INSERT/UPDATE/DELETE against a table within a row trigger defined on that table or any code called from such a trigger, which is why an error occurred at run time. There are ways to work around this - for example, you can read my answers to this question and this question - but in general you will have to avoid accessing the table on which a row trigger is defined from within the trigger.
The calculation which is being performed in this trigger is what is referred to as business logic and should not be performed in a trigger. Putting logic such as this in a trigger, no matter how convenient it may seem to be, will end up being very confusing to anyone who has to maintain this code because the value of BILANZ is changed where someone who is reading the application code's INSERT or UPDATE statement can't see it. This calculation should be performed in the INSERT or UPDATE statement, not in a trigger. It considered good practice to define a procedure to perform INSERT/UPDATE/DELETE operations on a table so that all such calculations can be captured in one place, instead of being spread out throughout your code base.
Within a BEFORE ROW trigger you can modify the values of the fields in the :NEW row variable to change values before they're written to the database. There are times that this is acceptable, such as when setting columns which track when and by whom a row was last changed, but in general it's considered a bad idea.
Best of luck.
You are modifying the table with the trigger. Use a before update trigger:
CREATE OR REPLACE TRIGGER Aktien_Bilanz_Berechnung
BEFORE INSERT OR UPDATE OF TAGESKURS OR INSERT OR UPDATE OF WERT_BEIM_EINKAUF
ON AKTIE
FOR EACH ROW
DECLARE
v_bfr number;
BEGIN
v_bfr := :new.TAGESKURS - :new.WERT_BEIM_EINKAUF;
:new.BILANZ := v_bfr;
IF v_bfr < -50 THEN
Raise_Application_Error(-20456,'ACHTUNG: The value (Nr: '|| :new.AKTIEN_NR || ') is very low!');
END IF;
END;
I want to create an update trigger for a table. The trigger was created, but when I update the column finish, it say mutating table.
This is my code
CREATE OR REPLACE TRIGGER SET_COST BEFORE UPDATE OF finish ON PAY
FOR EACH ROW
BEGIN
UPDATE PAY
SET PAY.COST = (finish-start) * 20000
WHERE PAY.ID=:new.ID;
END;
This trigger gives me 'Mutating Table' error and so far I have been unable to fix it. Any Suggestion ? Thanks
First of all, you shouldn't be doing that at all. There's no use in storing values that are easily calculated whenever you need them.
As of your question: no UPDATE:
begin
:new.cost := (:new.finish - :new.start) * 20000;
end;
I am looking to create a trigger that will bring back staff id when a row is inserted.
I have this so far:
CREATE OR REPLACE TRIGGER insert_trigger
BEFORE
INSERT ON staff
FOR EACH ROW
DECLARE
v_staff_id VARCHAR2(5);
BEGIN
SELECT staff_id from staff INTO v_staff_id FROM dual;
END;
I keep getting errors like sql statment ignored and command not ended properly for this line:
v_staff_id VARCHAR2(5);
Any help would be appreciated.
Thanks
You can access the new/altered data(inserted/update data) by using semi-column ':'
As you are writing trigger while inserting the data you need to use :new.column_name.
In the example it is :new.staff_id.
For complete reference please check
http://docs.oracle.com/cd/B19306_01/server.102/b14200/statements_7004.htm
I am writing a Oracle trigger. This trigger should automatically set the value of the column "productId" to be the oid of the row just inserted.
The trigger I wrote is:
create or replace trigger MyProduct_id_trg
after insert on MyProduct
begin
update MyProduct set productId = inserted.oid where oid = inserted.oid;
end;
However, this does not work.
Can someone help me with this?
Regards.
Looks like you are trying to use SQL Server syntax on an Oracle database! Try this:
create or replace trigger MyProduct_id_trg
before insert on MyProduct
for each row
begin
:new.productId := :new.oid;
end;
(Note: before not after, and with for each row.)