Trigger with a transfer error

I had a problem in class that to define a trigger that would update a sales table when an order has been placed (this information is stored in another table). Thanks for any help.

The Question in the gist:

A trigger is needed so that every time an order is confirmed (when ORDERPLACED is set to 1 in the table bb_basket) the bb_sale_sum table is updated accorddingly.

This is my code so far:

CREATE OR REPLACE TRIGGER bb_salesum_trg
After the UPDATE of orderplaced WE bb_basket
for each line
When (old.orderplaced <>1 and new.orderplaced = 1).
declare
Number of lv_tot_num (7.2);
Number of lv_qty_num (7.2);
number of lv_id_num (3,0);
Start
Select b, b.quantity, bi.idproduct
in lv_tot_num, lv_qty_num, lv_id_num
of bb_basket b, bb_basketitem bi
where bi.idbasket = b.idbasket;
Update bb_sales_sum
Set tot_qty = tot_qty + lv_qty_num
where idproduct = lv_id_num;
Update bb_sales_sum
Set tot_sales = tot_sales + lv_tot_num
where idproduct = lv_id_num;
END;
/

Update bb_basket
Set orderplaced = 1
where idbasket = 3;


And then my mistake:

Error from the 281 in command line:
Update bb_basket
Set orderplaced = 1
where idbasket = 3
Error report:
SQL error: ORA-04091: table SYSTEM. BB_BASKET is changing, function of triggering/can not see
ORA-06512: at "SYSTEM. BB_SALESUM_TRG', line 6
ORA-04088: error during execution of trigger ' SYSTEM. BB_SALESUM_TRG'
04091 00000 - "table %s.%s is changing, function of triggering/can not see.
* Cause: A trigger (or plsql user-defined function that is referenced in)
This statement) attempted to watch (or modify) a table that has been
in the Middle being modified by the statement that shot.
* Action: Rewrite the trigger (or function) so it does not read this table.


* I guess I get this error because I try to use TOT_QTY & TOT_SALE of my most while I'm updateing as column.* *.


Here are three tables I think I need for this problem:

CREATE TABLE bb_Basket)
idBasket number (5),
Quantity number (2),
idShopper number 4,
OrderPlaced number (1).
Total part number (7.2).
The number total (7.2).
Number (5.2) of the expedition.
Number (5.2) tax.
date of dtCreated by DEFAULT SYSDATE,
Promo number (2),
ShipFirstName varchar2 (10),
ShipLastName varchar2 (20).
ShipAddress varchar2 (40),
ShipCity varchar2 (20).
ShipState varchar2 (2),
ShipZipCode varchar2 (15).
ShipPhone varchar2 (10),
ShipFax varchar2 (10),
ShipEmail varchar2 (25).
BillFirstName varchar2 (10),
BillLastName varchar2 (20).
BillAddress varchar2 (40),
BillCity varchar2 (20).
BillState varchar2 (2),
BillZipCode varchar2 (15).
BillPhone varchar2 (10),
BillFax varchar2 (10),
BillEmail varchar2 (25).
date of dtOrdered by DEFAULT SYSDATE,
ShipProvince varchar2 (20).
ShipCountry varchar2 (20).
BillProvince varchar2 (20).
BillCountry varchar2 (20).
CardType char(1),
CardNumber varchar2 (20).
ExpMonth tank (2),
ExpYear char (4),
CardName varchar2 (25).
char (1) default 'n' shipbill,
Default char (1) ShipFlag 'n',
Bskt_id_pk KEY (idBasket) PRIMARY, the CONSTRAINT
CONSTRAINT bskt_idshopper_fk FOREIGN KEY (idShopper)
REFERENCES bb_Shopper (idShopper));
Create sequences bb_idBasket_seq
start with 25;
insert into bb_basket (idbasket, quantity, idshopper, orderplaced, partial, total, shipping, tax, dtcreated, promo)
values (3, 3, 21, 1, 26.60, 32.40, 5.00,.80, 23 January 07 ', 0);
insert into bb_basket (idbasket, quantity, idshopper, orderplaced, partial, total, shipping, tax, dtcreated, promo)
values (4, 1, 21, 1, 28.50, 34.36, 5.00,.86, 12 February 07 ', 0);
insert into bb_basket (idbasket, quantity, idshopper, orderplaced, partial, total, shipping, tax, dtcreated, promo)
values (5, 4, 22, 1, 41,60, 48,47, 5.00, 1.87, 19 February 07 ', 0);
insert into bb_basket (idbasket, quantity, idshopper, orderplaced, partial, total, shipping, tax, dtcreated, promo)
values (6, 3, 22, 1, 149.99, 161,74, 5.00, 6.75, 1 March 07 ', 0);
insert into bb_basket (idbasket, quantity, idshopper, orderplaced, partial, total, shipping, tax, dtcreated, promo)
values (7, 2, 23, 1, 21.60, 27.25, 5.00,.65, 26 January 07 ', 0);
insert into bb_basket (idbasket, quantity, idshopper, orderplaced, partial, total, shipping, tax, dtcreated, promo)
values (8, 2, 23, 1, 21.60, 27.25, 5.00,.65, 16 February 07 ', 0);
insert into bb_basket (idbasket, quantity, idshopper, orderplaced, partial, total, shipping, tax, dtcreated, promo)
values (9, 2, 23, 1, 21.60, 27.25, 5.00,.65, 2 March 07 ', 0);
insert into bb_basket (idbasket, quantity, idshopper, orderplaced, partial, total, shipping, tax, dtcreated, promo)
values (10, 3, 24, 1, 38.90, 45,65, 5.00, 1.75, 7 February 07 ', 0);
insert into bb_basket (idbasket, quantity, idshopper, orderplaced, partial, total, shipping, tax, dtcreated, promo)
values (11, 1, 24, 1, 10: 00 am, 3:45 pm, 5.00,.45, 27 February 07 ', 0);
insert into bb_basket (idbasket, quantity, idshopper, orderplaced, partial, total, shipping, tax, dtcreated, promo)
values (12, 7, 25, 1, 72,40, 83,66, 8.00, 3.26, 19 February 07 ', 0);
insert into bb_basket (idbasket, quantity, idshopper, orderplaced, partial, total, shipping, tax, dtcreated, promo)
values (13, 2, 26, 0, 20 h 00, 0, 0, 0, 9 February 07 ', 0);
insert into bb_basket (idbasket, quantity, idshopper, orderplaced, partial, total, shipping, tax, dtcreated, promo)
values (14, 0, 26, 0, 0, 0, 0, 0, 10 February 07 ', 0);
Update bb_basket
Set dtordered = dtcreated;
Update bb_basket
Set dtordered = NOTHING
where orderplaced = 0;

CREATE TABLE bb_basketItem)
idBasketItem number (2),
idProduct number (2),
Price number (6.2),
Quantity number (2),
idBasket number (5),
option 1 number (2),
option2 number (2),
CONSTRAINT bsktitem_id_pk PRIMARY KEY (idBasketItem).
CONSTRAINT bsktitem_bsktid_fk FOREIGN KEY (idBasket)
REFERENCES bb_Basket (idBasket),
CONSTRAINT bsktitem_idprod_fk FOREIGN KEY (idproduct)
REFERENCES bb_Product (idproduct));
Create sequences bb_idBasketitem_seq
start with 50;
insert into bb_basketItem
values (15, 6, 5.00, 1, 3, 1, 4);
insert into bb_basketItem
values (16, 8, 10.80, 2, 3, 2, 4);
insert into bb_basketItem
values (17, 4, 28.50, 1, 4, NULL, NULL);
insert into bb_basketItem
values (18, 7, 10.80, 1, 5, 2, 3);
insert into bb_basketItem
values (19, 8, 10.80, 1, 5, 2, 3);
insert into bb_basketItem
values (20, 9, 10 h 00, 1, 5, 2, 3);
insert into bb_basketItem
values (10, 21, 10 h 00, 1, 5, 2, 3);
insert into bb_basketItem
values (22, 10, 10: 00, 2, 6, 2, 4);
insert into bb_basketItem
values (23, 2, 129.99, 1, 6, NULL, NULL);
insert into bb_basketItem
values (24, 7, 10.80, 1, 7, 2, 3);
insert into bb_basketItem
values (25, 8, 10.80, 1, 7, 2, 3);
insert into bb_basketItem
values (26, 7, 10.80, 1, 8, 2, 3);
insert into bb_basketItem
values (27, 8, 10.80, 1, 8, 2, 3);
insert into bb_basketItem
values (28, 7, 10.80, 1, 9, 2, 3);
insert into bb_basketItem
values (29, 8, 10.80, 1, 9, 2, 3);
insert into bb_basketItem
values (30, 6, 5.00, 1, 10, 1, 3);
insert into bb_basketItem
values (31, 8, 5.40, 1, 10, 1, 3);
insert into bb_basketItem
values (32, 4, 28.50, 1, 10, NULL, NULL);
insert into bb_basketItem
values (33, 9, 10 h 00, 1, 11, 2, 3);
insert into bb_basketItem
values (34, 8, 10.80, 2, 12, 2, 3);
insert into bb_basketItem
values (35, 9, 10 h 00, 2, 12, 2, 3);
insert into bb_basketItem
values (36, 6, 10 h 00, 2, 12, 2, 3);
insert into bb_basketItem
values (37, 7, 10.80, 1, 12, 2, 3);
insert into bb_basketItem
values (38, 9, 10 h 00, 2, 13, 2, 3);
CREATE TABLE bb_sales_sum
(idProduct NUMBER (2),)
tot_sales NUMBER (7.2).
tot_qty, NUMBER (5.2));
INSERT INTO bb_sales_sum (idProduct, tot_sales, tot_qty)
VALUES (6, 100, 10);
INSERT INTO bb_sales_sum (idProduct, tot_sales, tot_qty)
VALUES (8, 100, 10);

>
Well, I didn't belive that's what I do.
>
Well that's exactly what you do

select b.total, b.quantity, bi.idproduct
into lv_tot_num, lv_qty_num, lv_id_num
from bb_basket b, bb_basketitem bi
where bi.idbasket = b.idbasket;

you query the table bb_basket ('from bb_basket') inside the trigger that updates the bb_baske table. This will give the error table mutation as just pointed out.

Tags: Database

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