I had trouble converting the following command to the oracle command.
I will be glad if you help!
Create Trigger sales_stock_reduction
On SalesMovements
After insert
as
Declare #ProductId int
Declare #Piece int
Select #ProductId=ProductId, #Piece=Piece from inserted
Update Uruns set stock=stock - #Piece where ProductId=#ProductId
In this code, when sales are made, the number of stocks in the product table is reduced through the sales movement table.
I could not write this code in oracle. Wonder how to write in Oracle
You can convert that like this
CREATE OR REPLACE TRIGGER sales_stock_reduction
AFTER INSERT ON SalesMovements
FOR EACH ROW
DECLARE
v_ProductId inserted.ProductId%type;
v_Piece inserted.Piece%type;
BEGIN
BEGIN
SELECT ProductId, Piece
INTO v_ProductId, v_Piece
FROM inserted;
EXCEPTION WHEN NO_DATA_FOUND THEN NULL;
END;
UPDATE Uruns
SET stock=stock - v_Piece
WHERE ProductId=v_ProductId;
END;
/
In Oracle :
OR REPLACE clause is used whenever the trigger needs to be edited
local variables might be defined as the data type of those have
within the table
each individual statements end with a semi-colon
exception handling for NO_DATA_FOUND is added due to presuming at most one
row returns from the current query for the inserted table which doesn't have
a WHERE condition to restrict the result set
Related
My Oracle DB has a table DOC_WF_COMM and its primary key is DWFC_ID. Primary key value is based on a sequence called SQ_DOC_WF_COMM.
I have created a row level AFTER INSERT trigger on that table and inside the trigger I need to join the inserted record with some other tables like this:
create or replace TRIGGER TRG_DOC_WF_COMM_AFT_INS AFTER INSERT ON DOC_WF_COMM REFERENCING OLD AS OLD NEW AS NEW FOR EACH ROW
DECLARE
PRAGMA AUTONOMOUS_TRANSACTION;
L_SUBJECT VARCHAR2(300);
L_BODY CLOB;
L_PNT_CODE VARCHAR(100) := NULL;
L_DR_PRJ_ID NUMBER(12);
L_STR_EMAIL VARCHAR2(120);
L_DWFC_TO_USR_ID VARCHAR2(12);
L_PNT_ID NUMBER(12);
L_PNT_EMAIL_YN VARCHAR(1);
L_PNT_ACTIVE_YN VARCHAR(1);
L_PNT_NOTIFY_YN VARCHAR(1);
BEGIN
IF INSERTING THEN
L_PNT_CODE := 'WFNT_MESSAGE';
SELECT DR_PRJ_ID, STR_EMAIL, DWFC_TO_USR_ID INTO L_DR_PRJ_ID, L_STR_EMAIL, L_DWFC_TO_USR_ID
FROM DOC_WF_COMM
JOIN DOC_WF_USERS ON DWFU_ID = DWFC_DWFU_ID
JOIN DOC_WORKFLOW ON DWF_ID = DWFU_DWF_ID
JOIN DOCUMENT_REF ON DR_ID = DWF_DR_ID
JOIN ST_REGISTER ON STR_ID = DWFU_STR_ID
WHERE DWFC_ID = :NEW.DWFC_ID AND DWFC_RESPONSE IS NULL;
-- SOME QUERIES HERE
END IF;
END;
The trigger is compiled successfully and when I insert record into DOC_WF_COMM table I get this error:
ORA-01403: no data found ORA-06512
The error is :NEW.DWFC_ID in WHERE clause and I have change it to these values:
:OLD.DWFC_ID
SQ_DOC_WF_COMM.NEXTVAL
SQ_DOC_WF_COMM.CURRVAL
But no any luck. Any idea why this error is and how can I resolve it?
The problem is this line in your trigger:
PRAGMA AUTONOMOUS_TRANSACTION;
That means the trigger executes as an isolated transaction in a separate session, which means it cannot see the uncommitted state of any other session. Crucially this includes the session which fires the trigger, so the autonomous transaction cannot see the record you just inserted. Hence, NO_DATA_FOUND.
You haven't posted the whole trigger or explained what you're trying to do, so only you know why you have included the PRAGMA. However, the chances are you don't need it. Remove the PRAGMA (and the COMMIT) and your trigger should work just fine.
If I understood you correctly, create a local variable and put the next sequence value in there. Then it can be referenced throughout the code, always having the same value. Something like this:
declare
l_seq number := my_seq.nextval;
begin
insert into table_a (id, ...) values (l_seq, ...);
update table_b set id = l_seq where ...
select ... into ... from ... where id = l_seq;
end;
I changed the query inside the trigger to this, it is working fine
SELECT STR_PRJ_ID, STR_EMAIL, :NEW.DWFC_TO_USR_ID INTO L_DR_PRJ_ID, L_STR_EMAIL, L_DWFC_TO_USR_ID
FROM DOC_WF_USERS, ST_REGISTER
WHERE :NEW.DWFC_TO_USR_ID = DWFU_US_ID AND DWFU_STR_ID = STR_ID AND DWFU_ID = :NEW.DWFC_DWFU_ID;
Not sure why is that. If anyone can figure out the mistake in the query given in the question, please let me know. Thanks
So I am trying to add age with price and store the result on another table with the ID of the person who did this. I am able to set the business rule by making the trigger but when I check my second (END) table, there is nothing there.. Here is my code for the trigger:
CREATE OR REPLACE TRIGGER JIM
BEFORE INSERT ON END
FOR EACH ROW ENABLE
DECLARE
V_AGE JIM.AGE%TYPE;
V_PRICE JIM.PRICE%TYPE;
v_prices NUMBER(20);
BEGIN
SELECT AGE,PRICE INTO V_AGE,V_PRICE FROM JIM WHERE ID=:NEW.ID;
v_prices:=V_AGE+V_PRICE;
INSERT INTO END VALUES(:new.ID,v_prices);
END;
However, When I insert values onto the JIM table using the following code:
insert into jim values(4,'Sim',45,100);
nothing actually gets stored on the END table. i am sort of new to triggers and its so confusing. Please let me know what to do. thanls
Don't use a keyword end as a table name, this causes problem during
creation of trigger. I've presumed the table's name as t_end.
I think you are confused on which table to define trigger. It seems
you should define on table jim instead of t_end.
I've presumed you have a sequence named seq_end to populate the id
column of the table t_end
So , your trigger creation statement will be as follows :
create or replace trigger trg_ins_jim before insert on jim for each row
declare
v_id_end t_end.id%type;
v_prices t_end.prices%type;
begin
v_prices := :new.age + :new.price;
v_id_end := seq_end.nextval; insert into t_end values(v_id_end, v_prices);
/* if you have defined sequence for t_end as default value of id column, you may change the upper row as "insert into t_end(prices) values(v_prices);" and there would be no need for "v_id_end" */
end;
and when you issue insert into jim values(4,'Sim',45,100); command, you'll also have values inserted into t_end.
If there is only one table, then the SELECT and the INSERT are redundant.
CREATE OR REPLACE TRIGGER trigger_name
BEFORE INSERT ON table_name
FOR EACH ROW
BEGIN
:NEW.PRICES := :NEW.AGE + :NEW.PRICE;
END;
Possible duplicate
I have two tables of ITEM(Menu_Id,Menu_Status) & STOCK(Stock_Id,Menu_Id,Stock_Quantity).
Now I want to update the Menu_Status column of ITEM table, when the Stock_Quantity column of STOCK table value will be zero.
And also I implement this on Oracle Apex 5.0 .
I want to handle this in backend of database, when customer orders and Stock_Quantity will be minus(-) according to number of quantity is ordered.
Which one better for this? Trigger or Procedure? Please help me by providing code.
I tried this code but having ORA-24344: success with compilation error message!
create or replace trigger "KITCHEN_T11"
AFTER
insert or update on "KITCHEN"
for each row
when (NEW.quantity<= 0)
begin
declare
mid number;
begin
select m_id into mid from kitchen where k_id=:new.k_id;
update menu_item set status=0 where m_id=mid;
end;
end;
You should anyhow write a procedure to update item table. Only choice need to make is to call it from where.
If you know all the process who are updating stock table, and if this procedure can be placed there, it will be best option.
In case it is not possible, you can call this procedure from trigger.
CREATE OR REPLACE TRIGGER "STOCK_T1"
AFTER
insert or update on "STOCK"
for each row
WHEN (NEW.stock_quantity<= 0)
begin
update item set menu_status=0 where menu_id=:NEW.MENU_ID;
end;
I wrote an Oracle function (for 8i) to fetch rows affected by a DML statement, emulating the behavior of RETURNING * from PostgreSQL. A typical function call looks like:
SELECT tablename_dml('UPDATE tablename SET foo = ''bar''') FROM dual;
The function is created automatically for each table and uses Dynamic SQL to execute a query passed as an argument. Moreover, a statement that executes the query dynamically is also wrapped in a BEGIN .. END block:
EXECUTE IMMEDIATE 'BEGIN'||query||' RETURNING col1, col2 BULK COLLECT INTO :1, :2;END;' USING OUT col1_t, col2_t;
The reason behind this perculiar construction is that it seems to be the only way to get values from the DML statement that affects multiple rows. Both col1_t and col2_t are declared as collections of the types corresponding to the table columns.
Finally, to the problem. When the query passed contains a subselect, execution of the function produces a syntax error. Below is a simpe example to illustrate this:
CREATE TABLE xy(id number, name varchar2(80));
CREATE OR REPLACE FUNCTION xy_fn(query VARCHAR2) RETURN NUMBER IS
PRAGMA AUTONOMOUS_TRANSACTION;
BEGIN
EXECUTE IMMEDIATE 'BEGIN '||query||'; END;';
ROLLBACK;
RETURN 5;
END;
SELECT xy_fn('update xy set id = id + (SELECT min(id) FROM xy)') FROM DUAL;
The last statement produces the following error: (the SELECT that is mentioned there is the SELECT min(id))
ORA-06550: line 1, column 32: PLS-00103: Encountered the symbol
"SELECT" when expecting one of the following: ( - + mod not null
others avg count current exists max min prior sql stddev sum
variance execute forall time timestamp interval date
This problem occurs on 8i (8.1.6), but not 10g.
If BEGIN .. END blocks are removed - the problem disappears.
If a subselect in a query is replaced with something else, i.e. a constant, the problem disappears.
Unfortunately, I'm stuck with 8i and removing BEGIN .. END is not an option (see the explanation above).
Is there a specific Oracle 8i limitation in play here? Is it possible to overcome it with dynamic SQL?
Not sure why you need to do all this work. Oracle 8i supported RETURNING INTO with bulk collection. Find out more
So you should just be able to execute this statement in non-dynamic SQL. Something like this:
UPDATE tablename
SET foo = 'bar'
returning col1, col2 bulk collect into col1_t, col2_t;
Stripped of all the irrelevancies, I think your question is simple.
This update statement runs in SQL:
update xy set id = id + (SELECT min(id) FROM xy);
And this anonymous block also runs:
begin
update xy set id = id + 100;
end;
But combining the two doesn't work:
begin
update xy set id = id + (SELECT min(id) FROM xy);
end;
Probably you have run into a limitation of older Oracle. Prior to 9i, the SQL engine and the PL/SQL SQL engine were always out of sync. So latest features supported in SQL often weren't supported in PL/SQL. It seems like you have one of those.
Since 9i Oracle have striven to keep the two engines in sync, so it is much rarer to find things which work in SQL but not in PL/SQL.
Given the nature of your task, upgrading your version of Oracle is out. So all I can suggest is that you have two procedures, one which supports the sub query syntax (by avoiding the need for such subqueries. Something like this:
CREATE OR REPLACE FUNCTION xy_sqfn
(main_query VARCHAR2
, sub_query VARCHAR2 )
RETURN NUMBER
IS
n pls_integer;
BEGIN
execute immediate sub_query into n;
EXECUTE IMMEDIATE 'BEGIN '||main_query||'; END;'
using n;
RETURN 5;
END;
call it like this
result := xy_sqfn ('update xy set id = id + :1'
, 'SELECT min(id) FROM xy');
Now this approach won't work for correlated sub-queries. So it you have any of them, you'll need to do something different again.
Incidentally, using the AUTONOMOUS TRANSACTION pragma to fudge executing DML in a SELECT statement is quite horrible. Why not just run the functions in PL/SQL? Or use procedures? I suppose you'll say it doesn't matter because you're just writing some shonky code to support a data migration. Which is fair enough, but for the benefit of future seekers: don't do this! It's very bad practice!
I want to keep track of changes to one table in another table. What I need is an after update trigger which writes the name of changed column (if multiple columns are changed then there will be multiple inserts to the CHANGES table),the column's old and new values. How do I do that. I tried this but got an error after updating the table.So I'm giving you just the body.
IF :NEW.STAJYEAR!=:OLD.STAJYEAR THEN
INSERT INTO X_STAJ (USERID,EDITDATE,CHANGEDCOLUMN,OLDVALUE,NEWVALUE)
VALUES (:NEW.USERID,SYSDATE,'STAJYEAR',:OLD.STAJYEAR,:NEW.STAJYEAR);
END IF;
the error code is :ORA-04098: trigger 'SYS.TR__TRACK_CHANGES' is invalid and failed re-validation
CREATE OR REPLACE TRIGGER STAJCHANGER.TR_TRACK_CHANGES
AFTER UPDATE
OF STAJYEAR
,STAJMONTH
,STAJDAY
ON STAJCHANGER.STAJ
REFERENCING NEW AS New OLD AS Old
FOR EACH ROW
DECLARE
OLDVALUE NUMBER;
NEWVALUE NUMBER;
COLUMNID NUMBER;
BEGIN
IF :NEW.STAJYEAR!=:OLD.STAJYEAR THEN
INSERT INTO X_STAJ (USERID,EDITDATE,CHANGEDCOLUMN,OLDVALUE,NEWVALUE)
VALUES (:NEW.USERID,SYSDATE,'STAJYEAR',:OLD.STAJYEAR,:NEW.STAJYEAR);
END IF;
IF :NEW.STAJMONTH!=:OLD.STAJMONTH THEN
INSERT INTO X_STAJ (USERID,EDITDATE,CHANGEDCOLUMN,OLDVALUE,NEWVALUE)
VALUES (:NEW.USERID,SYSDATE,'STAJMONTH',:OLD.STAJMONTH,:NEW.STAJMONTH);
END IF;
IF :NEW.STAJDAY!=:OLD.STAJDAY THEN
INSERT INTO X_STAJ (USERID,EDITDATE,CHANGEDCOLUMN,OLDVALUE,NEWVALUE)
VALUES (:NEW.USERID,SYSDATE,'STAJDAY',:OLD.STAJDAY,:NEW.STAJDAY);
END IF;
END TR_TRACK_CHANGES;
/
The error appears to indicates that the trigger owner is SYS, but the creation statement you show explicitly gives the owner as STAJCHANGER.
This makes me wonder, did you accidentally create an (invalid) version of the trigger in SYS at some point, and forget to drop it?
This SQL Plus command will show the error:
SHOW ERROR TRIGGER STAJCHANGER.TR_TRACK_CHANGES