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2010-05-26T13:46:06Z

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2010-05-26T10:20:11Z

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==A simple example of the @@ERROR variable==



<source lang="sql">

1> -- A simple example of the @@ERROR variable.
2>
3>
4> SELECT 5 / 0
5> SELECT @@ERROR
6>
7> GO
Msg 8134, Level 16, State 1, Server sqle\SQLEXPRESS, Line 4
Divide by zero error encountered.
-----------
8134
(1 rows affected)
1>

</source>

==Create a Stored Procedure that raises an error==



<source lang="sql">

3> CREATE PROCEDURE #usp_TempProc
4> AS
5> SELECT 1/0
6> RETURN @@ERROR
7> GO
1>
2> DECLARE @ErrorCode int
3> EXEC @ErrorCode = #usp_TempProc
4> PRINT @ErrorCode
5> GO
Msg 8134, Level 16, State 1, Server BCE67B1242DE45A\SQLEXPRESS, Procedure #usp_TempProc_________________________________
__________________________________________________________________________00000077, Line 11
Divide by zero error encountered.
(0 rows affected)
8134
1>
2> drop procedure #usp_TempProc
3> GO
</source>

==Rollback transaction on error==



<source lang="sql">

23>
24> CREATE TABLE MySavings(AccountNum Int NOT NULL,
25> Amount Money NOT NULL)
26>
27> CREATE TABLE MyChecking(AccountNum Int NOT NULL,
28> Amount Money NOT NULL)
29>
30> ALTER TABLE MyChecking ADD CONSTRAINT ckMinBalance
31> CHECK (Amount > $100.00)
32>
33> INSERT MySavings VALUES (12345, $1000.00)
34>
35> INSERT MyChecking VALUES (12345, $1000.00)
36> GO
(1 rows affected)
(1 rows affected)
1>
2> /*SQL SERVER 2000 Error Handling*/
3> BEGIN TRANSACTION
4> UPDATE MyChecking SET Amount = Amount - $990.00
5> WHERE AccountNum = 12345
6> IF @@ERROR != 0
7> BEGIN
8> ROLLBACK TRANSACTION
9> RETURN
10> END
11> ELSE
12> UPDATE MySavings SET Amount = Amount + $990.00
13> WHERE AccountNum = 12345
14> IF @@ERROR != 0
15> BEGIN
16> ROLLBACK TRANSACTION
17> RETURN
18> END
19> ELSE
20> COMMIT TRANSACTION
21> GO
Msg 547, Level 16, State 1, Server sqle\SQLEXPRESS, Line 4
The UPDATE statement conflicted with the CHECK constraint "ckMinBalance". The conflict occurred in database "master", table "dbo.MyChecking"
The statement has been terminated.
1>
2> drop table MySavings;
3> drop table MyChecking;
4> GO
1>
2>

</source>

==Use @Error==



<source lang="sql">
1> create table employee(
2> ID int,
3> name nvarchar (10),
4> salary int,
5> start_date datetime,
6> city nvarchar (10),
7> region char (1))
8> GO
1>
2> insert into employee (ID, name, salary, start_date, city, region)
3> values (1, "Jason", 40420, "02/01/94", "New York", "W")
4> GO
(1 rows affected)
1> insert into employee (ID, name, salary, start_date, city, region)
2> values (2, "Robert",14420, "01/02/95", "Vancouver","N")
3> GO
(1 rows affected)
1> insert into employee (ID, name, salary, start_date, city, region)
2> values (3, "Celia", 24020, "12/03/96", "Toronto", "W")
3> GO
(1 rows affected)
1> insert into employee (ID, name, salary, start_date, city, region)
2> values (4, "Linda", 40620, "11/04/97", "New York", "N")
3> GO
(1 rows affected)
1> insert into employee (ID, name, salary, start_date, city, region)
2> values (5, "David", 80026, "10/05/98", "Vancouver","W")
3> GO
(1 rows affected)
1> insert into employee (ID, name, salary, start_date, city, region)
2> values (6, "James", 70060, "09/06/99", "Toronto", "N")
3> GO
(1 rows affected)
1> insert into employee (ID, name, salary, start_date, city, region)
2> values (7, "Alison",90620, "08/07/00", "New York", "W")
3> GO
(1 rows affected)
1> insert into employee (ID, name, salary, start_date, city, region)
2> values (8, "Chris", 26020, "07/08/01", "Vancouver","N")
3> GO
(1 rows affected)
1> insert into employee (ID, name, salary, start_date, city, region)
2> values (9, "Mary", 60020, "06/09/02", "Toronto", "W")
3> GO
(1 rows affected)
1>
2> select * from employee
3> GO
ID name salary start_date city region
----------- ---------- ----------- ----------------------- ---------- ------
1 Jason 40420 1994-02-01 00:00:00.000 New York W
2 Robert 14420 1995-01-02 00:00:00.000 Vancouver N
3 Celia 24020 1996-12-03 00:00:00.000 Toronto W
4 Linda 40620 1997-11-04 00:00:00.000 New York N
5 David 80026 1998-10-05 00:00:00.000 Vancouver W
6 James 70060 1999-09-06 00:00:00.000 Toronto N
7 Alison 90620 2000-08-07 00:00:00.000 New York W
8 Chris 26020 2001-07-08 00:00:00.000 Vancouver N
9 Mary 60020 2002-06-09 00:00:00.000 Toronto W
(9 rows affected)
1>
2> --Dealing with Errors
3>
4> -- Making Use of @@ERROR
5>
6> DECLARE @Error int
7> INSERT INTO Employee (ID) VALUES (999999)
8> SELECT @Error = @@ERROR
9> PRINT ""
10> PRINT "The Value of @Error is " + CONVERT(varchar, @Error)
11> PRINT "The Value of @@ERROR is " + CONVERT(varchar, @@ERROR)
12> GO
(1 rows affected)
(1 rows affected)

(1 rows affected)
The Value of @Error is 0
(1 rows affected)
The Value of @@ERROR is 0
1>
2> select * from employee
3> GO
ID name salary start_date city region
----------- ---------- ----------- ----------------------- ---------- ------
1 Jason 40420 1994-02-01 00:00:00.000 New York W
2 Robert 14420 1995-01-02 00:00:00.000 Vancouver N
3 Celia 24020 1996-12-03 00:00:00.000 Toronto W
4 Linda 40620 1997-11-04 00:00:00.000 New York N
5 David 80026 1998-10-05 00:00:00.000 Vancouver W
6 James 70060 1999-09-06 00:00:00.000 Toronto N
7 Alison 90620 2000-08-07 00:00:00.000 New York W
8 Chris 26020 2001-07-08 00:00:00.000 Vancouver N
9 Mary 60020 2002-06-09 00:00:00.000 Toronto W
999999 NULL NULL NULL NULL NULL
(10 rows affected)
1>
2>
3> drop table employee
4> GO
1>

</source>

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в 13:46, 26 мая 2010

Admin: 1 версия