This is my create trigger statement:
CREATE OR REPLACE TRIGGER time_of_inserts
AFTER INSERT ON t_workers
FOR EACH ROW
BEGIN
SELECT pk_workerid, sysdate archivetime
into t_logtable
from t_workers
END;
What I want is, every time when I insert a new row into the t_workers table, I want to insert a new primary key (it could be unique from 1, or copying the inserted data), and the time of the insert into a new table (T_logTable). But I don't know how to insert this into a new table every time. You can see above, what I've came up so far.
"my main problem is inserting into a new table, every time it's triggered"
But you're not inserting, you're selecting. To insert you need to specify the insert keyword :)
Also, you don't want to select from the triggering table: use the :NEW namespace instead.
CREATE OR REPLACE TRIGGER time_of_inserts
AFTER INSERT ON t_workers
FOR EACH ROW
BEGIN
insert into t_logtable
values (:new.pk_workerid , sysdate );
END;
To remove the apparent confusion, SELECT ... INTO populates a local (PL/SQL) variable. It is not the syntax we use for inserting into a table.
Related
I trying to write a trigger that will update a column when user insert or updates a row, within the same table.
Example:
insert into user(ID, F_NM, L_NM, EMAIL) values ('1', 'John','Doe','john.doe#market.org.com');
after the insert, i want to call: update user set ORG = 'market' where ID = '1'.
create or replace trigger user_change
after insert or update of EMAIL on USER
for each row
declare
NEW_ORG VARCHAR(10);
BEGIN
CASE
when :NEW.EMAIL like '$#market.org.com' then
NEW_ORG := 'market';
........
END CASE;
UPDATE USER set ORG = NEW_ORG where ID = :NEW.ID
END;
Calculating the new ORG work, but I can't get the update statement to work.
I get 'ORA-04091 table USER is mutating, trigger/funtion may not see it', figure its due to me inserting/updating the same record at same time. Tried adding 'pragma autonomous_transaction' and 'commit' to the trigger, the insert/update of fields works but the ORG does not get updated.
Also tried changing to INSTEAD OF INSERT OR UPDATE OF EMAIL but I keep getting 'ORA-04073 column list not valid for this trigger type'
create or replace trigger user_change
instead of insert or update of EMAIL on USER
while i get 'ORA-25002 cannot create instead of triggers on tables'
create or replace trigger user_change
instead of insert on USER
Why not simply turn the trigger to a before trigger, when you can set the value before it is written? This way, you don't need to run a new DML statement on the table, which avoid the "mutating" error.
create or replace trigger user_change
after insert or update of email on user
for each row
begin
if :new.email like '%#market.org.com' then
:new.org := 'market';
end if;
end;
Looks like your org column can be calculated virtual column. In this case it would be better to create user-defined deterministic pl/sql function that returns correct calculated value and add it to your table, for example:
Alter table t add org varchar2(30) generated always as (f_get_org(email))
I am trying to make an upsert trigger on ORACLE via PL/SQL by checking some examples, i am doing fine, i think it is the last step i should only configure. My requirement is that :
A system that will insert to that field will remain one column always null, so i will read column value from another table, then upsert it with inclusion of that value.
d2c_region_locale_config holds d2c_is_active value, so i firstly read that value regarding to locale condition then trigger inserts or updates to table with addition of this value on active_for_d2c column.(for update i am using locale and country columns as it is shown on where clause, they are not PK but has not null condition)
So i've created this trigger:
CREATE OR REPLACE TRIGGER BL_PIM_LOCALE_COUNTRY
BEFORE INSERT OR UPDATE ON PIM_LOCALE_COUNTRY REFERENCING NEW AS NEW OLD AS OLD
FOR EACH ROW
DECLARE
l_active_for_d2c INTEGER;
BEGIN
if :NEW.active_for_d2c is null then
DELETE from pim_locale_country where active_for_d2c is null;
select distinct(d2c_isactive) into l_active_for_d2c from d2c_region_locale_config where d2c_locale= :NEW.locale;
UPDATE pim_locale_country
SET locale = :NEW.locale, locale_name = :NEW.locale_name,
country = :NEW.country, country_name = :NEW.country_name, isdummy = :NEW.isdummy,
active_for_d2c = l_active_for_d2c, itextpos = :NEW.itextpos, locale_charset = :NEW.locale_charset,
fallback_locale = :NEW.fallback_locale, default_for_lang = :NEW.default_for_lang, opeclang = :NEW.opeclang
where locale = :NEW.locale and country = :NEW.country;
IF ( sql%notfound ) THEN
INSERT INTO PIM_LOCALE_COUNTRY (locale,locale_name,country,country_name,isdummy,active_for_d2c,itextpos,locale_charset,fallback_locale,default_for_lang,opeclang)
VALUES (:NEW.locale, :NEW.locale_name,:NEW.country,:NEW.country_name,:NEW.isdummy,l_active_for_d2c,:NEW.itextpos,:NEW.locale_charset,:NEW.fallback_locale,:NEW.default_for_lang,:NEW.opeclang);
END IF;
end if;
END;
It currently does the job, reads value and inserts or updates the existing locale-country couple for other values. But critical thing is that, table always has one "null" value(Please check screenshot), even that i run delete statement at the beginning on my trigger. So my question would be how to delete, or how to make this approach on trigger side ?
Many thanks for answers!
Trigger before insert doesn't block insert itself, so you insert that record twice. That is, once your trigger done its work (inserted or updated record), oracle will proceed with insert (or update) using values that stand in NEW record of your trigger. If trigger modifies NEW., it will be stored as you changed it, but if trigger inserts something itself, you can get more records.
You can use instead of insert or update triggers, and then oracle will not run its own inserts/updates after trigger finishes.
But more common way for 1-record triggers is to modify fields in NEW, for this case field NEW.d2c_is_active.
It looks like this (possible typos, please check)
CREATE OR REPLACE TRIGGER BL_PIM_LOCALE_COUNTRY
BEFORE INSERT OR UPDATE ON PIM_LOCALE_COUNTRY REFERENCING NEW AS NEW OLD AS OLD
FOR EACH ROW
BEGIN
if :NEW.active_for_d2c is null then
select d2c_isactive
into :NEW.active_for_d2c
from d2c_region_locale_config
where d2c_locale= :NEW.locale and rownum<=1;
end if;
END;
I am trying to write a trigger in SAP HANA to update a field of a table when new records are being inserted to that table. Following is a sample trigger that I have written.
CREATE TRIGGER SAMPLE
AFTER INSERT ON TARGET_TABLE
REFERENCING NEW ROW NEW_ROW
FOR EACH ROW
BEGIN
UPDATE TARGET_TABLE SET VALID_FROM='2018-02-01' WHERE ITEM=:NEW_ROW.ITEM
END
When I try this, I get the error:
Modification of subject table in trigger not allowed
Is there a way by which I can achieve this?
This suggests to use the transition variable NEW_ROW, appreciate if a code sample can be provided.
You don't actually need to create trigger for your requirement as I can see from your post (of course if it is only updating a date field)
You can define the VALID_FROM column with a DEFAULT value
For example,
Create Column Table DefaultColumnTable (
Id int,
Code varchar(5),
VALID_FROM date default '2018-02-01'
)
So whenever a new row is inserted, unless an alternative value is stated the valid_from column will be populated with default date specified in the DDL command above.
The users can change the valid_from field value without any problem
#Kalpa, maybe you can use BEFORE INSERT Trigger
Please check following sample
create trigger TriggerTable_B_INS BEFORE INSERT on TriggerTable
REFERENCING NEW ROW mynewrow
FOR EACH ROW
begin
declare lv_d date;
lv_d := '20180201';
mynewrow.VALID_FROM = :lv_d;
end;
You set only the new row columns before Insert command executes over the target table.
You don't explicitly execute an INSERT command, just set new values for new row columns. That's all
I hope it helps
I have 2 tables which are my_school and my_class
And "my_school" table has 'info_id' column and also "my_class" table has 'info_id' then I want to get a query that automatically generate "info_id" then I found solution..
Here are my working TRIGGER on "my_school" table...
CREATE OR REPLACE TRIGGER info_id
before insert on my_direction
for each row
begin
if :NEW.WAY_ID is null then
:NEW.WAY_ID := example_id_seq.nextval;
end if;
end;
It works and it's generating auto id when inserting value.
But now how to get this trigger do it on "my_class" table when users insert value on my_school's table then take id with "my_class" table's "info_id" column same time?
You can create trigger on my_school table to update info_id similar to that you have explained and while inserting records, use returning into clause.
Declare a variable to store returned value, for example
v_info_id number(9);
And use it in returning into clause
insert into my_school(column.......list)
values (values........list)
RETURNING info_id INTO v_info_id;
Use v_info_id in your program to insert value of info_id into another tables.
I have a workqueue table that has a workid column. The workID column has values that increment automatically. Is there a way I can run a query in the backend to insert a new row and have the workID column increment automatically?
When I try to insert a null, it throws error ORA01400 - Cannot insert null into workid.
insert into WORKQUEUE (facilitycode,workaction,description) values ('J', 'II', 'TESTVALUES')
What I have tried so far - I tried to look at the table details and didn't see any auto-increment. The table script is as follow
"WORKID" NUMBER NOT NULL ENABLE,
Database: Oracle 10g
Screenshot of some existing data.
ANSWER:
I have to thank each and everyone for the help. Today was a great learning experience and without your support, I couldn't have done. Bottom line is, I was trying to insert a row into a table that already has sequences and triggers. All I had to do was find the right sequence, for my question, and call that sequence into my query.
The links you all provided me helped me look these sequences up and find the one that is for this workid column. Thanks to you all, I gave everyone a thumbs up, I am able to tackle another dragon today and help patient care take a step forward!"
This is a simple way to do it without any triggers or sequences:
insert into WORKQUEUE (ID, facilitycode, workaction, description)
values ((select max(ID)+1 from WORKQUEUE), 'J', 'II', 'TESTVALUES')
It worked for me but would not work with an empty table, I guess.
To get an auto increment number you need to use a sequence in Oracle.
(See here and here).
CREATE SEQUENCE my_seq;
SELECT my_seq.NEXTVAL FROM DUAL; -- to get the next value
-- use in a trigger for your table demo
CREATE OR REPLACE TRIGGER demo_increment
BEFORE INSERT ON demo
FOR EACH ROW
BEGIN
SELECT my_seq.NEXTVAL
INTO :new.id
FROM dual;
END;
/
There is no built-in auto_increment in Oracle.
You need to use sequences and triggers.
Read here how to do it right. (Step-by-step how-to for "Creating auto-increment columns in Oracle")
ELXAN#DB1> create table cedvel(id integer,ad varchar2(15));
Table created.
ELXAN#DB1> alter table cedvel add constraint pk_ad primary key(id);
Table altered.
ELXAN#DB1> create sequence test_seq start with 1 increment by 1;
Sequence created.
ELXAN#DB1> create or replace trigger ad_insert
before insert on cedvel
REFERENCING NEW AS NEW OLD AS OLD
for each row
begin
select test_seq.nextval into :new.id from dual;
end;
/ 2 3 4 5 6 7 8
Trigger created.
ELXAN#DB1> insert into cedvel (ad) values ('nese');
1 row created.
You can use either SEQUENCE or TRIGGER to increment automatically the value of a given column in your database table however the use of TRIGGERS would be more appropriate. See the following documentation of Oracle that contains major clauses used with triggers with suitable examples.
Use the CREATE TRIGGER statement to create and enable a database trigger, which is:
A stored PL/SQL block associated with a table, a schema, or the
database or
An anonymous PL/SQL block or a call to a procedure implemented in
PL/SQL or Java
Oracle Database automatically executes a trigger when specified conditions occur. See.
Following is a simple TRIGGER just as an example for you that inserts the primary key value in a specified table based on the maximum value of that column. You can modify the schema name, table name etc and use it. Just give it a try.
/*Create a database trigger that generates automatically primary key values on the CITY table using the max function.*/
CREATE OR REPLACE TRIGGER PROJECT.PK_MAX_TRIGGER_CITY
BEFORE INSERT ON PROJECT.CITY
FOR EACH ROW
DECLARE
CNT NUMBER;
PKV CITY.CITY_ID%TYPE;
NO NUMBER;
BEGIN
SELECT COUNT(*)INTO CNT FROM CITY;
IF CNT=0 THEN
PKV:='CT0001';
ELSE
SELECT 'CT'||LPAD(MAX(TO_NUMBER(SUBSTR(CITY_ID,3,LENGTH(CITY_ID)))+1),4,'0') INTO PKV
FROM CITY;
END IF;
:NEW.CITY_ID:=PKV;
END;
Would automatically generates values such as CT0001, CT0002, CT0002 and so on and inserts into the given column of the specified table.
SQL trigger for automatic date generation in oracle table:
CREATE OR REPLACE TRIGGER name_of_trigger
BEFORE INSERT
ON table_name
REFERENCING NEW AS NEW
FOR EACH ROW
BEGIN
SELECT sysdate INTO :NEW.column_name FROM dual;
END;
/
the complete know how, i have included a example of the triggers and sequence
create table temasforo(
idtemasforo NUMBER(5) PRIMARY KEY,
autor VARCHAR2(50) NOT NULL,
fecha DATE DEFAULT (sysdate),
asunto LONG );
create sequence temasforo_seq
start with 1
increment by 1
nomaxvalue;
create or replace
trigger temasforo_trigger
before insert on temasforo
referencing OLD as old NEW as new
for each row
begin
:new.idtemasforo:=temasforo_seq.nextval;
end;
reference:
http://thenullpointerexceptionx.blogspot.mx/2013/06/llaves-primarias-auto-incrementales-en.html
For completeness, I'll mention that Oracle 12c does support this feature. Also it's supposedly faster than the triggers approach. For example:
CREATE TABLE foo
(
id NUMBER GENERATED BY DEFAULT AS IDENTITY (
START WITH 1 NOCACHE ORDER ) NOT NULL ,
name VARCHAR2 (50)
)
LOGGING ;
ALTER TABLE foo ADD CONSTRAINT foo_PK PRIMARY KEY ( id ) ;
Best approach: Get the next value from sequence
The nicest approach is getting the NEXTVAL from the SEQUENCE "associated" with the table. Since the sequence is not directly associated to any specific table,
we will need to manually refer the corresponding table from the sequence name convention.
The sequence name used on a table, if follow the sequence naming convention, will mention the table name inside its name. Something likes <table_name>_SEQ. You will immediately recognize it the moment you see it.
First, check within Oracle system if there is any sequence "associated" to the table
SELECT * FROM all_sequences
WHERE SEQUENCE_OWNER = '<schema_name>';
will present something like this
Grab that SEQUENCE_NAME and evaluate the NEXTVAL of it in your INSERT query
INSERT INTO workqueue(id, value) VALUES (workqueue_seq.NEXTVAL, 'A new value...')
Additional tip
In case you're unsure if this sequence is actually associated with the table, just quickly compare the LAST_NUMBER of the sequence (meaning the current value) with the maximum id of
that table. It's expected that the LAST_NUMBER is greater than or equals to the current maximum id value in the table, as long as the gap is not too suspiciously large.
SELECT LAST_NUMBER
FROM all_sequences
WHERE SEQUENCE_OWNER = '<schema_name>' AND SEQUENCE_NAME = 'workqueue_seq';
SELECT MAX(ID)
FROM workqueue;
Reference: Oracle CURRVAL and NEXTVAL
Alternative approach: Get the current max id from the table
The alternative approach is getting the max value from the table, please refer to Zsolt Sky answer in this same question
This is a simple way to do it without any triggers or sequences:
insert into WORKQUEUE (ID, facilitycode, workaction, description)
values ((select count(1)+1 from WORKQUEUE), 'J', 'II', 'TESTVALUES');
Note : here need to use count(1) in place of max(id) column
It perfectly works for an empty table also.