CREATE OR REPLACE TRIGGER trigg_example
BEFORE INSERT OR UPDATE ON table_example
FOR EACH ROW
WHEN (new.no_line > 0)
DECLARE
evol_exemple number;
BEGIN
evol_exemple := :new.exemple - :old.exemple;
DBMS_OUTPUT.PUT_LINE(' evolution : ' || evol_exemple);
END;CREATE DATABASE productdb;
GO
--create a table called Products
USE productdb;
CREATE TABLE Products
(
Id INT IDENTITY PRIMARY KEY,
ProductName NVARCHAR(30) NOT NULL,
Manufacturer NVARCHAR(20) NOT NULL,
ProductCount INT DEFAULT 0,
Price MONEY NOT NULL
);
--create a trigger called Products_INSERT_UPDATE
CREATE TRIGGER Products_INSERT_UPDATE
ON Products
AFTER INSERT, UPDATE
AS
UPDATE Products
SET Price = Price + Price * 0.38
WHERE Id = (SELECT Id FROM inserted)
--one example
ISERT INTO Products(ProductName,Manufacturer,ProductCount,Price)
VALUES ('IPhone X',2,'Apple',68000)
SELECT * FROM Products
--answer will be Price = 9384000
--Turn off trigger
DISABLE TRIGGER Products_INSERT_UPDATE ON Products
--Turn on trigger
ENABLE TRIGGER Products_INSERT_UPDATE ON Products
--Delete trigger
DROP TRIGGER Products_INSERT_UPDATESyntax:
create trigger [trigger_name]
[before | after]
{insert | update | delete}
on [table_name]
[for each row]
as [print/select]
Example:
create trigger myDel
on tbl_pro
after delete
as
select * from tbl_product
print 'Record Deleted successfully!!!'
CREATE TRIGGER production.trg_product_audit
ON production.products
AFTER INSERT, DELETE
AS
BEGIN
SET NOCOUNT ON;
INSERT INTO production.product_audits(
product_id,
product_name,
brand_id,
category_id,
model_year,
list_price,
updated_at,
operation
)
SELECT
i.product_id,
product_name,
brand_id,
category_id,
model_year,
i.list_price,
GETDATE(),
'INS'
FROM
inserted i
UNION ALL
SELECT
d.product_id,
product_name,
brand_id,
category_id,
model_year,
d.list_price,
GETDATE(),
'DEL'
FROM
deleted d;
END
Code language: SQL (Structured Query Language) (sql)
BEGIN
UPDATE `product`
SET `price` = NEW.price
, `quantity` = NEW.quantity
, date_modified = NOW()
WHERE `product_id` = NEW.product_id;
AND price > NEW.price
AND quantity > 0
;
END