My task is pretty much simple let's say I have table having 3 columns i.e. temp(ids, name_c, UID_c) and I have first two column values and 3rd column is nullable. What I want to do is whenever these two value is inserted the value of third column must be updated (after insertion) with new value. i.e concatenation of both values.
For Ex.
insert into temp(ids, name_c) values(did.nextval,'Andrew');
The result should be
1 Andrew Andrew_1
So I am using trigger for this purpose
create or replace trigger triggerDemo
after INSERT
on temp
for each row
declare
/* pragma autonomous_transaction;*/
user_name varchar2(50);
current_val number;
begin
select did.currval into current_val from dual; /* did is sequence */
select names into user_name from temp where ids = current_val;
update temp set uid_c = user_name||'_'||ids where ids = current_val;
end;
When I am inserting the values I get this error
01403. 00000 - "no data found"
*Cause: No data was found from the objects.
*Action: There was no data from the objects which may be due to end of fetch.
First, you want a before insert trigger, not an after insert trigger. Second, decide whether you want to calculate the id on input or in the trigger. You can do something like this:
create or replace trigger triggerDemo before INSERT on temp
for each row
/* pragma autonomous_transaction;*/
begin
if :new.current_val is null then
select did.currval into :new.ids from dual; /* did is sequence */
end;
select :new.user_name || '_' || :new.ids into :new.uid_c from dual;
end;
Related
I have a table and I want to increment a column by 1 when I insert a row into the same table.
Table users - when I insert first row value of idusers is 1, and in second row value is 2 ....
This is the table
USERS
EMAIL primary key
USERNAME
PASSWORD
IDUSER and this the column I want to be AUTO_INCREMENT
I have tried this code
CREATE SEQUENCE seq_person
MINVALUE 1
START WITH 1
INCREMENT BY 1
CACHE 10;
create or replace trigger incrementIdUser
before insert on users
for each row
begin
select seq_person.nextval into :new.IDUSER from users;
end;
But I get an error when I insert a row:
Erreur lors de l'enregistrement des modifications de la table "SOCIAL"."USERS" :
Ligne 1 : ORA-01403: no data found
ORA-01403: no data found
ORA-06512: at "SOCIAL.INCREMENTIDUSER", line 2
ORA-04088: error during execution of trigger 'SOCIAL.INCREMENTIDUSER'
ORA-06512: at line 1
Not like that, but
create or replace trigger incrementIdUser
before insert on users
for each row
begin
:new.iduser := seq_person.nextval;
end;
Code you wrote selects from users table (which is empty, hence NO_DATA_FOUND). If it contained more than a single row, you'd get TOO_MANY_ROWS (as you're selecting into a scalar variable (:new.iduser). Finally, there's danger of mutating table error as you can't select from a table which is just being modified (in this trigger type).
Insetead of select seq_person.nextval into :new.IDUSER from users; to assign sequence value into iduser you need to use :new.IDUSER :=seq_person.nextval;
create or replace trigger incrementIdUser
before insert on users
for each row
begin
:new.IDUSER :=seq_person.nextval;
end;
You get that error because there are zero rows in the USERS table so SELECT ... FROM USERS returns no rows.
What you want is to either use a table that will always return a single row (which, in Oracle, is the DUAL table):
create or replace trigger incrementIdUser
before insert on users
for each row
begin
select seq_person.nextval into :new.IDUSER from DUAL;
end;
Or, the better solution, is to not use an SQL statement and use pure PL/SQL:
create or replace trigger incrementIdUser
before insert on users
for each row
begin
:new.IDUSER := seq_person.nextval;
end;
Instead of using a trigger, you should use an identity column in the create table statement:
create table users
(iduser integer generated by default on null as identity (nomaxvalue nocache order),
...);
Im trying to create a trigger when updating table 'test' to make sure a value in a column is not greater than another one from a different table. But I get this error on Oracle Apex: ORA-24344: success with compilation error
'test' is a table and 'chestionar' is a second one, so I want to launch that error when I insert a value in 'punctaj' which is greater than the 'punctaj_max'. And the id of the both tables must be the same . What should I modify?
here is my code:
CREATE OR REPLACE trigger trg_a
BEFORE UPDATE on test
begin
if test.punctaj > chestionar.punctaj_max and test.id=chestionar.id then
raise_application_error(234,'error, the value is grater than maximum of that id');
end if;
end;
I think the logic you want is:
create or replace trigger trg_a
before update on test
for each row
declare
p_punctaj_max chestionar.punctaj_max%type;
begin
select punctaj_max into p_punctaj_max from chestionar c where c.id = :new.id;
if :new.punctaj > p_punctaj_max then
raise_application_error(234, 'error, the value is grater than maximum of that id');
end if;
end;
/
The idea is to recover the value of punctaj_max in table chestionar for the id of the row that is being updated in test (note that this implicitely assumes that there cannot be multiple matching rows in chestionar). We can then compare that to the value being updated, and raise the error if needed.
You have three (I think) issue in your code:
You should apply trigger at time of insert also.
you need to query the table chestionar and then compare the value.
the error number in raise_application_error should be negative and between -20999 and -20000.
So, I would rewrite your code as follows:
create or replace trigger trg_a
before update or insert on test
for each row
declare
lv_cnt number := 0;
begin
select count(1) into lv_cnt
from chestionar c
where c.id = :new.id
and :new.punctaj > c.punctaj_max;
if lv_cnt > 0 then
raise_application_error(-20234, 'error, the value is grater than maximum of that id');
end if;
end;
/
I have a created a procedure as
create or replace procedure availability(num in number) as
begin
delete from vehicle_count;
insert into vehicle_count from select engine_no,count(engine_no)
from vehicle
where engine_no = num
group by engine_no;
end;
/
The procedure was created successfully but now i have to write a separate query to view the contents of vehicle_count as
select * from vehicle_count;
I tried inserting the select statement into the procedure after insertion but it showed a error stating "an INTO clause is expected in the select statement".
How can I create procedure to select the required contents and display it in a single execute statement?
Table schema
vehicle(vehicle_no,engine_no,offence_count,license_status,owner_id);
vehicle_count(engine_no,engine_count);
Check this (MS SQL SERVER)-
create or alter procedure availability(#num as int) as
begin
delete from vehicle_count;
insert into vehicle_count
output inserted.engine_no,inserted.count_engine_no
select engine_no,count(engine_no) as count_engine_no
from vehicle
where engine_no=#num
group by engine_no;
end;
If you want to use a SELECT into a PL/SQL block you should use either a SELECT INTO or a loop (if you want to print more rows).
You could use something like this:
BEGIN
SELECT engine_no, engine_count
INTO v_engine, v_count
FROM vehicle_count
WHERE engine_no = num;
EXCEPTION
WHEN NO_DATA_FOUND THEN
v_engine := NULL;
v_count := NULL;
END;
v_engine and v_count are two variables. You can declare them in your procedure, and they will contain the values you want to print.
You said that the procedure you wrote (actually, you posted here) compiled successfully. Well, sorry to inform you - that's not true. This is not a valid syntax:
insert into vehicle_count from select engine_no,count(engine_no)
----
from? Here?
Consider posting true information.
As of your question (if we suppose that that INSERT actually inserted something into a table):
at the beginning, you delete everything from the table
as SELECT counts number of rows that share the same ENGINE_NO (which is equal to the parameter NUM value), INSERT inserts none (if there's no such NUM value in the table) or maximum 1 row (because of aggregation)
therefore, if you want to display what's in the table, all you need is a single SELECT ... INTO statement whose result is displayed with a simple DBMS_OUTPUT.PUT_LINE which will be OK if you're doing it interactively (in SQL*Plus, SQL Developer, TOAD and smilar tools). Regarding table description, I'd say that ENGINE_NO should be a primary key (i.e. that not more than a single row with that ENGINE_NO value can exist in a table).
create or replace procedure availability (num in number) as
l_engine_no vehicle_count.engine_no%type;
l_engine_count vehicle_count.engine_count%type;
begin
delete from vehicle_count;
insert into vehicle_count (engine_no, engine_count)
select engine_no, count(engine_no)
from vehicle
where engine_no = num
group by engine_no;
-- This query shouldn't return TOO-MANY-ROWS if ENGINE_NO is a primary key.
-- However, it might return NO-DATA-FOUND if there's no such NUM there, so you should handle it
select engine_no, engine_count
into l_engine_no, l_engine_count
from vehicle_count
where engine_no = num;
dbms_output.put_line(l_engine_no ||': '|| l_engine_count);
exception
when no_data_found then
dbms_output.put_line('Nothing found for ENGINE_NO = ' || num);
end;
/
There are numerous alternatives to that (people who posted their answers/comments before this one mentioned some of those), and the final result you'd be satisfied with depends on where you want to display that information.
I want a trigger that updates the value of a column, but I just want to update a small set of rows that depends of the values of the inserted row.
My trigger is:
CREATE OR REPLACE TRIGGER example
AFTER INSERT ON table1
FOR EACH ROW
BEGIN
UPDATE table1 t
SET column2 = 3
WHERE t.column1 = :new.column1;
END;
/
But as I using FOR EACH ROW I have a problem when I try it, I get the mutating table runtime error.
Other option is not to set the FOR EACH ROW, but if I do this, I dont know the inserted "column1" for comparing (or I dont know how to known it).
What can I do for UPDATING a set of rows that depends of the last inserted row?
I am using Oracle 9.
You should avoid the DML statements on the same table as defined in a trigger. Use before DML to change values of the current table.
create or replace trigger example
before insert on table1
for each row
begin
:new.column2 := 3;
end;
/
You can modify the same table with pragma autonomous_transaction:
create or replace trigger example
after insert on table1 for each row
declare
procedure setValues(key number) is
pragma autonomous_transaction;
begin
update table1 t
set column2 = 3
where t.column1 = key
;
end setValues;
begin
setValues(:new.column1);
end;
/
But I suggest you follow #GordonLinoff answere to your question - it's a bad idea to modify the same table in the trigger body.
See also here
If you need to update multiple rows in table1 when you are updating one row, then you would seem to have a problem with the data model.
This need suggests that you need a separate table with one row per column1. You can then fetch the value in that table using join. The trigger will then be updating another table, so there will be no mutation problem.
`create table A
(
a INTEGER,
b CHAR(10)
);
create table B
(
b CHAR (10),
d INTEGER
);
create trigger trig1
AFTER INSERT ON A
REFERENCING NEW AS newROW
FOR EACH ROW
when(newROW.a<=10)
BEGIN
INSERT into B values(:newROW.b,:newROW.a);
END trig1;
insert into A values(11,'Gananjay');
insert into A values(5,'Hritik');
select * from A;
select * from B;`
I have a requirement of which I want to create a trigger in Oracle.
So what I want is: I have a table called XXCUS.XXACL_PN_PROSPECT_TRL in which there is a column called ACTION whose default value is set as RELEASE, EXTEND and CANCEL.
So my trigger would be on the table XXCUS.XXACL_PN_PROSPECT_TRL as
whenever the column ACTION has values as
RELEASE then the other table column should get UPDATED as R with the same matching ID
EXTEND then the other table column should get UPDATED as O with the same matching ID
CANCEL then the other table column should get UPDATED as C with the same matching ID
The other table name is xxcus.xxacl_pn_leases_all whose column needs to be updated. Also the column name is CLOSE_FLAG.
I m trying like below
CREATE [ OR REPLACE ] TRIGGER XXACL_PN_PROSPECT_T
BEFORE INSERT
ON XXCUS.XXACL_PN_PROSPECT_TRL
[FOR EACH ROW]
DECLARE
-- variable declaration
BEGIN
-- trigger code
Insert into XXCUS.XXACL_PN_PROSPECT_TRL -- values for ACTION here
then
update xxcus.xxacl_pn_leases_all if 'RELEASE' then 'R', if 'EXTEND' then 'O' where mkey = dynamic
EXCEPTION
WHEN ...
-- exception handling
END;
but it is not working as I am not champ in creating Triggers. Kindly help me with this
There are some obvious syntax errors
You don't need square brackets. Those are in the documentation to indicate optional parts.
Your insert/update statements are wrong, need to correct them.
It should look on the lines of :
CREATE OR REPLACE TRIGGER XXACL_PN_PROSPECT_T
BEFORE INSERT
ON XXCUS.XXACL_PN_PROSPECT_TRL
DECLARE
-- variable declaration
BEGIN
UPDATE xxcus.xxacl_pn_leases_all
SET CLOSE_FLAG = DECODE(:NEW.ACTION, 'RELEASE','R','EXTEND','O', 'CANCEL','C')
WHERE ID = :NEW.ID
END;
This trigger will update CLOSE_FLAG column of xxcus.xxacl_pn_leases_all based on what value comes in Action column of XXACL_PN_PROSPECT_TRL table.
While going through the links and documentation, I tried my self and figured out the solution.
There were many syntax errors in the starting. But I guess, I was the only one to apply the exact logic and took help of the syntax online.
So here it was my TRIGGER which I wrote and it worked perfectly.
CREATE OR REPLACE TRIGGER xxcus.xxacl_pn_prospect_trl_trg
AFTER INSERT OR UPDATE
ON xxcus.xxacl_pn_prospect_trl
FOR EACH ROW
DECLARE
sql_error VARCHAR (10000);
v_mkey NUMBER;
v_action VARCHAR (10);
BEGIN
v_action := :NEW.action;
IF (v_action = 'Extend')
THEN
UPDATE xxcus.xxacl_pn_leases_all
SET no_of_days = :NEW.current_action_days
WHERE lease_num = :NEW.lease_no;
ELSIF (v_action = 'Release')
THEN
UPDATE xxcus.xxacl_pn_leases_all
SET no_of_days = 0,
close_flag = 'R'
WHERE lease_num = :NEW.lease_no;
ELSE
UPDATE xxcus.xxacl_pn_leases_all
SET no_of_days = 0,
close_flag = 'C'
WHERE lease_num = :NEW.lease_no;
END IF;
EXCEPTION
WHEN OTHERS
THEN
sql_error := SQLERRM; END;/