Creating the UpdateLog table and an update trigger on the authors table. : Utility trigger « Trigger « SQL Server / T-SQL Tutorial

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

4>
5>
6> CREATE TABLE authors(
7>    au_id          varchar(11),
8>    au_lname       varchar(40)       NOT NULL,
9>    au_fname       varchar(20)       NOT NULL,
10>    phone          char(12)          NOT NULL DEFAULT ('UNKNOWN'),
11>    address        varchar(40)           NULL,
12>    city           varchar(20)           NULL,
13>    state          char(2)               NULL,
14>    zip            char(5)               NULL,
15>    contract       bit               NOT NULL
16> )
17> GO
1> insert authors values('1',  'Joe',   'Abra',   '111 111-1111', '6 St.', 'Berkeley',  'CA', '11111', 1)
2> insert authors values('2',  'Jack',  'Majo',   '222 222-2222', '3 St.', 'Oakland' ,  'CA', '22222', 1)
3> insert authors values('3',  'Pink',  'Cherry', '333 333-3333', '5 Ln.', 'Vancouver', 'BC', '33333', 1)
4> insert authors values('4',  'Blue',  'Albert', '444 444-4444', '7 Av.', 'Vancouver', 'BC', '44444', 1)
5> insert authors values('5',  'Red',   'Anne',   '555 555-5555', '6 Av.', 'Regina',    'SK', '55555', 1)
6> insert authors values('6',  'Black', 'Michel', '666 666-6666', '3 Pl.', 'Regina',    'SK', '66666', 1)
7> insert authors values('7',  'White', 'Sylvia', '777 777-7777', '1 Pl.', 'Rockville', 'MD', '77777', 1)
8> insert authors values('8',  'Yellow','Heather','888 888-8888', '3 Pu',  'Vacaville', 'CA', '88888', 0)
9> insert authors values('9',  'Gold',  'Dep',    '999 999-9999', '5 Av.', 'Oakland',   'CA', '99999', 0)
10> insert authors values('10', 'Siler', 'Dean',   '000 000-0000', '4 Av.', 'Oakland',   'CA', '00000', 1)
11> GO

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1>
2>     CREATE TABLE UpdateLog
3>     (
4>         table_name VARCHAR(30) NOT NULL,
5>         column_name VARCHAR(30) NOT NULL,
6>         updated_by VARCHAR(30) NOT NULL,
7>         updated_when DATETIME NOT NULL
8>     )
9>     GO
1>
2>     CREATE TRIGGER trAuthors_Upd ON Authors
3>     FOR UPDATE
4>     AS
5>     DECLARE @intRowCount int
6>     SELECT @intRowCount = @@RowCount
7>     IF @intRowCount > 0
8>         BEGIN
9>             IF UPDATE(au_id)
10>                 INSERT UpdateLog VALUES ('authors', 'au_id', suser_name(), getdate())
11>             IF UPDATE(au_lname)
12>                 INSERT UpdateLog VALUES ('authors', 'au_lname', suser_name(), getdate())
13>             IF UPDATE(au_fname)
14>                 INSERT UpdateLog VALUES ('authors', 'au_fname', suser_name(), getdate())
15>             IF UPDATE(phone)
16>                 INSERT UpdateLog VALUES ('authors', 'phone', suser_name(), getdate())
17>             IF UPDATE(address)
18>                 INSERT UpdateLog VALUES ('authors', 'address', suser_name(), getdate())
19>             IF UPDATE(city)
20>                 INSERT UpdateLog VALUES ('authors', 'city', suser_name(), getdate())
21>             IF UPDATE(state)
22>                 INSERT UpdateLog VALUES ('authors', 'state', suser_name(), getdate())
23>             IF UPDATE(zip)
24>                 INSERT UpdateLog VALUES ('authors', 'zip', suser_name(), getdate())
25>             IF UPDATE(contract)
26>                 INSERT UpdateLog VALUES ('authors', 'contract', suser_name(), getdate())
27>         END
28>     GO
1>
2>
3>     drop trigger trAuthors_Upd;
4>     GO
1>
2>     drop table sales;
3>     drop table UpdateLog;
4>     GO