Am very new to Oracle triggers. Suppose I have a trigger on an insert in the table emp. Is there a way to find out what was the inserted record that fired the trigger. I wanted the trigger to have code that does something if the inserted record was a particular value.
Assuming you have a row-level trigger, you can simply use the :NEW pseudo-record
CREATE TRIGGER name_of_trigger
BEFORE INSERT ON emp
FOR EACH ROW
DECLARE
<<declare variables>>
BEGIN
IF( :new.ename = 'JUSTIN' )
THEN
<<do something if the newly inserted ENAME value is 'JUSTIN'>>
END IF;
END;
For a DDL trigger, the approach is completely different. In that case, the pseudofunctions ora_dict_obj_owner and ora_dict_obj_name will return the owner and name of the table that the DDL statement is operating on.
The row that is being insertes is available as NEW in the trigger
Check out the manual for more details.
http://docs.oracle.com/cd/E11882_01/appdev.112/e25519/create_trigger.htm#BABEBAAB
http://docs.oracle.com/cd/E11882_01/appdev.112/e25519/triggers.htm#LNPLS99955
Related
I have a litte task. Firstly I added a column in my table with specific constraints. Then I added a trigger for other jobs.
But I need a rollbacksql and have no idea what to proceed. Can anybody help or give an advice about it? I am adding my sql snippet.
ALTER TABLE FCBSADM.GL_DEF ADD GL_TP NUMBER;
ALTER TABLE FCBSADM.GL_DEF ADD CONSTRAINTS CH_COL CHECK (GL_TP between 1 and 10);
CREATE OR REPLACE TRIGGER GL_DEF_GL_TP_TRG
BEFORE INSERT OR
DELETE OR
UPDATE OF CDATE, CMPNY_DEF_ID, CUSER, DESCR, GL_DEF_ID, MNY_TP_ID, ST, UDATE, UUSER, GL_TP
ON FCBSADM.GL_DEF
FOR EACH ROW
DECLARE
cnt number := 0;
BEGIN
IF INSERTING
THEN
IF :NEW.GL_TP = 2
THEN
SELECT 1 into cnt from dual where exists( select *
FROM LOOKUP_GLCODE_IND_CEZA lookup
WHERE lookup.indirim_glcode = :NEW.gl_Def_id);
IF (cnt = 1) THEN
raise_application_error
(-20101, 'Please insert record into LOOKUP_GLCODE_IND_CEZA before inserting GL_DEF');
END IF;
END IF;
END IF;
END;
What do you want to rollback? Adding a column and creating a trigger? If so, drop them, both.
alter table gl_def drop column gl_tp;
drop trigger gl_def_gl_tp_trg;
A trigger and newly added table can be rolled back only by using drop and alter statements. This is ok if its being done inside a script that executes only a few times. But is highly inefficient if both drop and alter are called frequently for n number of records.
I want to update field data_aktualizacji when some row in the same table is updated. I created the following compound trigger.
CREATE OR REPLACE TRIGGER oferta_update_trigger
FOR UPDATE ON oferty
compound TRIGGER
id_oferty number(10);
AFTER EACH ROW IS
BEGIN
id_oferty := :new.idk;
END AFTER EACH ROW;
AFTER STATEMENT IS
BEGIN
UPDATE oferty SET data_aktualizacji = SYSDATE WHERE idk = id_oferty;
END AFTER STATEMENT;
END;
/
When I want to update some record, I get the following error.
SQL Error: ORA-00036: maximum number of recursive SQL levels (50) exceeded.
How to solve this problem? I this that some loop is created, but I don't know, how to workaround this.
Update oracle to alter the column to default to sysdate
Alter table oferty alter column data_aktualizacji set default sysdate
No need for trigger at all
As Ctznkane525 wrote, you definitively should use default-value to perform this action.
If you don't want to use default you can modify new.data_aktualizacji:
CREATE OR REPLACE TRIGGER oferty_update_aktualizacji
BEFORE INSERT OR UPDATE
ON oferty
FOR EACH ROW
DECLARE
BEGIN
:new.data_aktualizacji:= sysdate;
END;
I have a problem with a "after insert" trigger which won't pass the value to a stored procedure that i'm calling inside the trigger.
It works ok for update and also i should mention that i am querying the table in the procedure that i am calling.
It goes something like:
create or replace trigger test_trg
after insert or update on table1
for each row
begin
test_procedure(:new.value1);
end;
The procedure looks inside table1 and inserts in table2 hints about what should be added in table1 based on the current inserted/updated row.
Thanks in advance!!
I found it!
The problem was not the trigger, it was in the procedure. I was performing a "dirty read" based on the record ID that i was sending (the record id of a new row).
Even though my trigger is "after insert" it looks like my row can't be found by the procedure and i was basing all my operations on it.
Fixed it by adding more parameters to the procedure and passing :new values straight from the trigger for everything i needed.
A trigger transaction is depend on its statement transaction. Therefore you can not read uncommitted records. So you should transfer "test_procedure" codes into your trigger and use :New record values to insert data into table2.
Your code should look like this:
create or replace trigger test_trg
after insert or update on table1
for each row
begin
if inserting then
insert into table2(ID, F1, F2, ...)
values (NEW_ID_VALUE, :NEW.F1_VALUE, :NEW.F2_VALUE, ...);
elsif updating then
update table2
set F1 = :NEW.F1_VALUE
, F2 = :NEW.F2_VALUE
where TABLE1_ID_FK = :NEW.ID;
end if;
end;
I am trying to create a trigger on my database, using SQL, such that after an insert into the table HISTORY table, if, the attribute FINISHED="T", the MESSAGE attribute is "FINISHED" else, if FINISHED="F", the MESSAGE is "NOT FINISHED".
This is my code currently when I try to run this, it says
"Trigger created with compilation errors"
Could someone please tell me what is wrong with this statement? Thank you!
CREATE OR REPLACE TRIGGER MESSAGE_TR
AFTER INSERT
ON HISTORY
FOR EACH ROW
BEGIN
IF (HISTORY.FINISHED="T")
THEN
INSERT INTO HISTORY(MESSAGE) VALUES("FINISHED");
ELSEIF (HISTORY.FINISHED="F")
INSERT INTO HISTORY(MESSAGE)VALUES("NOT FINISHED");
END;
/
I think this is what you intend:
CREATE OR REPLACE TRIGGER MESSAGE_TR
BEFORE INSERT
ON HISTORY
FOR EACH ROW
BEGIN
:NEW.MESSAGE := (CASE WHEN :NEW.FINISHED = 'T' THEN 'FINISHED' ELSE 'NOT FINISHED' END);
END;
Note that this is a before insert trigger, because it intends to modify the row being inserted.
I have a trigger that gets a sequence number to put into my id column when insert a Row, the question is, how easily retun the new inserted row as resultSet.
create or replace trigger trg_Dependencia_id
before insert on DEPENDENCIA
for each row
begin
select DEPENDENCIA_id_seq.nextval
into :new.id
from dual;
end;
In Oracle, Triggers does not return any value. Also, triggers are not for this issues.
Maybe, you can insert your nextval a temp table after insert your table(DEPENDENCIA.DEPENDENCIA_id). Then you can handle it with a function.