Creating a Trigger and raise an error : RAISERROR « Transact SQL « SQL Server / T-SQL






Creating a Trigger and raise an error

1> create table employee(
2>     ID          int,
3>     name        nvarchar (10),
4>     salary      int )
5> GO
1>
2> create table job(
3>     ID              int,
4>     title nvarchar  (10),
5>     averageSalary   int)
6> GO
1>
2>
3> insert into employee (ID, name, salary) values (1,  'Jason', 1234)
4> GO

(1 rows affected)
1> insert into employee (ID, name, salary) values (2,  'Robert', 4321)
2> GO

(1 rows affected)
1> insert into employee (ID, name, salary) values (3,  'Celia', 5432)
2> GO

(1 rows affected)
1> insert into employee (ID, name, salary) values (4,  'Linda', 3456)
2> GO

(1 rows affected)
1> insert into employee (ID, name, salary) values (5,  'David', 7654)
2> GO

(1 rows affected)
1> insert into employee (ID, name, salary) values (6,  'James', 4567)
2> GO

(1 rows affected)
1> insert into employee (ID, name, salary) values (7,  'Alison', 8744)
2> GO

(1 rows affected)
1> insert into employee (ID, name, salary) values (8,  'Chris', 9875)
2> GO

(1 rows affected)
1> insert into employee (ID, name, salary) values (9,  'Mary', 2345)
2> GO

(1 rows affected)
1>
2> insert into job(ID, title, averageSalary) values(1,'Developer',3000)
3> GO

(1 rows affected)
1> insert into job(ID, title, averageSalary) values(2,'Tester', 4000)
2> GO

(1 rows affected)
1> insert into job(ID, title, averageSalary) values(3,'Designer', 5000)
2> GO

(1 rows affected)
1> insert into job(ID, title, averageSalary) values(4,'Programmer', 6000)
2> GO

(1 rows affected)
1>
2>
3> select * from employee;
4> GO
ID          name       salary
----------- ---------- -----------
          1 Jason             1234
          2 Robert            4321
          3 Celia             5432
          4 Linda             3456
          5 David             7654
          6 James             4567
          7 Alison            8744
          8 Chris             9875
          9 Mary              2345

(9 rows affected)
1> select * from job;
2> GO
ID          title      averageSalary
----------- ---------- -------------
          1 Developer           3000
          2 Tester              4000
          3 Designer            5000
          4 Programmer          6000

(4 rows affected)
1>
2>
3> -- Creating a Trigger
4>
5> CREATE TRIGGER tr_DelData
6> ON Employee
7> FOR DELETE
8> AS
9>     IF (SELECT Count(*) FROM job) > 0
10>     BEGIN
11>       RAISERROR 50009 'Cannot delete an employee'
12>       ROLLBACK TRANSACTION
13>       RETURN
14>     END
15> GO
1>
2> delete employee
3> GO
Msg 50009, Level 16, State 1, Server JAVA2S\SQLEXPRESS, Procedure tr_DelData, Line 11
Cannot delete an employee
Msg 3609, Level 16, State 1, Server JAVA2S\SQLEXPRESS, Line 2
The transaction ended in the trigger. The batch has been aborted.
1>
2> select * from employee
3> GO
ID          name       salary
----------- ---------- -----------
          1 Jason             1234
          2 Robert            4321
          3 Celia             5432
          4 Linda             3456
          5 David             7654
          6 James             4567
          7 Alison            8744
          8 Chris             9875
          9 Mary              2345

(9 rows affected)
1>
2> drop trigger tr_DelData
3> drop table employee;
4> drop table job;
5> GO
1>

           
       








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