exits if the price column has not been updated. : Trigger « Trigger « SQL Server / T-SQL Tutorial

1. SQL Server / T-SQL Tutorial
2. Trigger
3. Trigger

3>
4> CREATE TABLE titles(
5>    title_id       varchar(20),
6>    title          varchar(80)       NOT NULL,
7>    type           char(12)          NOT NULL,
8>    pub_id         char(4)               NULL,
9>    price          money                 NULL,
10>    advance        money                 NULL,
11>    royalty        int                   NULL,
12>    ytd_sales      int                   NULL,
13>    notes          varchar(200)          NULL,
14>    pubdate        datetime          NOT NULL
15> )
16> GO
1>
2> insert titles values ('1', 'Secrets',   'popular_comp', '1389', $20.00, $8000.00, 10, 4095,'Note 1','06/12/94')
3> insert titles values ('2', 'The',       'business',     '1389', $19.99, $5000.00, 10, 4095,'Note 2','06/12/91')
4> insert titles values ('3', 'Emotional', 'psychology',   '0736', $7.99,  $4000.00, 10, 3336,'Note 3','06/12/91')
5> insert titles values ('4', 'Prolonged', 'psychology',   '0736', $19.99, $2000.00, 10, 4072,'Note 4','06/12/91')
6> insert titles values ('5', 'With',      'business',     '1389', $11.95, $5000.00, 10, 3876,'Note 5','06/09/91')
7> insert titles values ('6', 'Valley',    'mod_cook',     '0877', $19.99, $0.00,    12, 2032,'Note 6','06/09/91')
8> insert titles values ('7', 'Any?',      'trad_cook',    '0877', $14.99, $8000.00, 10, 4095,'Note 7','06/12/91')
9> insert titles values ('8', 'Fifty',     'trad_cook',    '0877', $11.95, $4000.00, 14, 1509,'Note 8','06/12/91')
10> GO

(1 rows affected)

(1 rows affected)

(1 rows affected)

(1 rows affected)

(1 rows affected)

(1 rows affected)

(1 rows affected)

(1 rows affected)
1>
2>     CREATE TRIGGER myTrigger ON titles
3>     FOR UPDATE
4>     AS
5>     DECLARE @chvMsg VARCHAR(255),
6>         @chvTitleID VARCHAR(6),
7>         @mnyOldPrice MONEY,
8>         @mnyNewPrice MONEY
9>     DECLARE myCursor CURSOR
10>          FOR
11>          SELECT d.title_id, d.price, i.price
12>          FROM deleted d INNER JOIN inserted i ON d.title_id = i.title_id
13>      IF update(price)
14>          BEGIN
15>              OPEN myCursor
16>              FETCH NEXT FROM myCursor INTO
17>                  @chvTitleID, @mnyOldPrice, @mnyNewPrice
18>              WHILE (@@fetch_status <> -1)
19>                  BEGIN
20>                      SELECT @chvMsg = 'The price of title ' + @chvTitleID
21>                              + ' has changed from'
22>                              + ' ' + CONVERT(VARCHAR(10), @mnyOldPrice)
23>                              + ' to ' + CONVERT(VARCHAR(10), @mnyNewPrice)
24>                              + ' on ' +
25>      CONVERT(VARCHAR(30), getdate()) + '.'EXEC master..xp_sendmail 'Colleen', @chvMsg
26>      FETCH NEXT FROM myCursor
27>                          INTO @chvTitleID, @mnyOldPrice, @mnyNewPrice
28>                      SELECT @chvMsg = ''
29>                  END
30>          DEALLOCATE myCursor
31>          END
32>      RETURN
33>      GO
1>
2>      drop trigger myTrigger;
3>      GO
1>
2>      drop table titles;
3>      GO
1>
2>