sql server programming: Another user has modified the contents of this table or view; the database row you are modifying no longer exists in the database; -- sql server programming

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Another user has modified the contents of this table or view; the database row you are modifying no longer exists in the database;

Ioannis Demetriades
6/30/2003 2:59:14 PM

sql server programming: Hi,

I am testing a trigger that and I am getting this error message saying

"Another user has modified the contents of this table or view; the database
row you are modifying no longer exists in the database"

What I am trying to do through the trigger is not to allow the creation of a
new session for which there exists another session with the same cashierid
and closingtime is NULL.

Thanks
Ioannis

CREATE TABLE [dbo].[Sessions] (
[id] [int] IDENTITY (1, 1) NOT NULL ,
[UserName] [char] (20) COLLATE SQL_Latin1_General_CP1_CI_AS NOT NULL ,
[OpeningTime] [datetime] NOT NULL ,
[OpeningBalance] [decimal](12, 2) NOT NULL ,
[ClosingBalance] [decimal](12, 2) NULL ,
[CalculatedBalance] [decimal](12, 2) NOT NULL ,
[ClosingTime] [datetime] NULL ,
[CashierId] [int] NULL
) ON [PRIMARY]

CREATE TRIGGER SessionINSERT ON [dbo].[Sessions]
FOR INSERT, UPDATE
AS

BEGIN
Declare @Count Integer
Declare @ErrorMsg VarChar(100)
Declare MyCursor CURSOR For Select id,UserName,OpeningBalance,CashierId
From Inserted

Declare @Id Int
Declare @UserName Char(20)
Declare @OpeningBalance Decimal(12,2)
Declare @cId Int

Open MyCursor
Fetch Next From MyCursor
Into @id,@UserName,@OpeningBalance,@cId

WHILE @@Fetch_Status <> -1
BEGIN
Print @id
Print @UserName
Print @OpeningBalance
Print @cId

Fetch Next From MyCursor
Into @id,@UserName,@OpeningBalance,@cId
END
Close MyCursor
Deallocate MyCursor

/*
Select @Count = count(*) From Inserted
Set @ErrorMsg = 'Count=' + convert(varchar(100),@Count)

Raiserror (@errormsg,16,1)
*/

If UPDATE(CashierId)
BEGIN
Declare @CashierId Int
Declare @OpeningTime DateTime

Select @CashierId = s.CashierId, @UserName = s.UserName, @OpeningTime =
s.OpeningTime
From Sessions s, Inserted I
Where s.CashierId = i.CashierId
And s.ClosingTime Is NULL
And i.ClosingTime Is NULL
And s.Id <> i.Id

If @CashierId is not null
BEGIN
ROLLBACK TRANSACTION

Declare @CashierName Char(20)

Select @CashierName=Description
From Cashiers
Where id = @CashierId

Set @ErrorMsg = 'Cashier ''' + RTrim(@CashierName) + ''' is currently
open by ' + RTrim(@UserName) + ' [' + Convert(varchar(20),@OpeningTime) +
']'

RAISERROR (@ErrorMsg,16, 1)
END
END
END

Re: Another user has modified the contents of this table or view; the database row you are modifying no longer exists in the database;

Ioannis Demetriades
6/30/2003 3:51:43 PM

Hi Mandar,

Your trigger works fine. However I still have to take care of any updates on
"Sessions.CashiersId". Do you know what caused this error message in my
original trigger?

Thanks

[quoted text, click to view]

Re: Another user has modified the contents of this table or view; the database row you are modifying no longer exists in the database;

Mandar Naik[MSFT]
6/30/2003 6:05:36 PM

Hi,

My understanding of your requirement is as follows:-
if there is the same cashierID in the table without a ClosingTime, then the
new INSERT should be rolled back.

Please check teh following code. I have tested it on a sample table and it
works fine. Do get back if you need any clarifications on the same.

CREATE TRIGGER SessionCheck ON dbo.Sessions
FOR INSERT
AS
BEGIN
DECLARE @sessionID int
DECLARE @count int
SELECT @sessionID = cashierID FROM INSERTED
SELECT @count = count(*) FROM Sessions
WHERE cashierID = @sessionID and
ClosingTime IS NULL
IF @count > 1
BEGIN
PRINT 'SESSION ALREADY EXISTS'
ROLLBACK TRANSACTION
END
END

--
Regards,
Mandar Naik

This posting is provided AS IS with no warranties, and confers no rights.
[quoted text, click to view]

Re: Another user has modified the contents of this table or view; the database row you are modifying no longer exists in the database;

Mandar Naik[MSFT]
6/30/2003 6:57:25 PM

Hi,

Regarding the update check, you will need a seperate trigger FOR UPDATE
where you can use the similar logic based on the updated column.

I am adding the code here. It works in my scenario. Please revert if you
have any queries.

CREATE TRIGGER SessionCheckUpd ON dbo.Sessions
FOR UPDATE
AS
BEGIN
DECLARE @sessionID int
DECLARE @count int
If UPDATE(SessionID)
BEGIN
SELECT @sessionID = CashiersId FROM INSERTED
SELECT @count = count(*) FROM Sessions
WHERE CashiersId= @sessionID and ClosingTime iS NULL
IF @count > 1
BEGIN
PRINT 'SESSION ALREADY EXISTS'
ROLLBACK TRANSACTION
END
END
END
--
Regards,
Mandar Naik

This posting is provided AS IS with no warranties, and confers no rights.
[quoted text, click to view]

Re: Another user has modified the contents of this table or view; the database row you are modifying no longer exists in the database;

Ioannis Demetriades
7/1/2003 9:01:16 AM

Hi Mandar,

Thanks for your advice. I took your code and made some minor modifications
and I noticed that when i run INSERT and UPDATE sql statements the triggers
behave as expected. It's only when I try to modify the data through the
Enterprise manager that I get this message. My question is whether i am
doing something fundamentally wrong with the triggers or is it something
that has to do with the cursor that is used to fetch the data in the
enterprise manager? Where can i get some info about this error message?

Thanks

--- CODE -------------

CREATE TABLE [dbo].[Sessions] (
[id] [int] IDENTITY (1, 1) NOT NULL ,
[UserName] [char] (20) COLLATE SQL_Latin1_General_CP1_CI_AS NOT NULL ,
[OpeningTime] [datetime] NOT NULL ,
[OpeningBalance] [decimal](12, 2) NOT NULL ,
[ClosingBalance] [decimal](12, 2) NULL ,
[CalculatedBalance] [decimal](12, 2) NOT NULL ,
[ClosingTime] [datetime] NULL ,
[CashierId] [int] NULL
) ON [PRIMARY]

drop trigger sessionINS
go
CREATE TRIGGER SessionINS ON dbo.Sessions
FOR INSERT
AS
BEGIN
/*
Print 'INSERT Trigger'
*/

DECLARE @iCashierId int
DECLARE @count int
Declare @iClosingTime DateTime

SELECT @iCashierId = cashierID, @iClosingTime = ClosingTime
FROM INSERTED

If @iClosingTime Is not NULL
Return

SELECT @count = count(*) FROM Sessions
WHERE cashierID = @iCashierId and
ClosingTime IS NULL

IF @count > 1
BEGIN
Raiserror ('SESSION ALREADY EXISTS (INSERT)',16,1)
ROLLBACK TRANSACTION
END
END

CREATE TRIGGER SessionUPD ON dbo.Sessions
FOR UPDATE
AS
BEGIN
DECLARE @iCashierId int
DECLARE @Count int
Declare @iClosingTime DateTime

/*
Print 'UPDATE Trigger'
*/
If UPDATE(CashierId)
BEGIN
/*
Print 'UPDATE Trigger: Updating CashierId'
*/
SELECT @iClosingTime = ClosingTime, @iCashierId = CashierId
FROM INSERTED

If @iClosingTime Is NOT NULL
Return

SELECT @count = count(*)
FROM Sessions
WHERE CashierId= @iCashierId
And ClosingTime Is NULL

IF @count > 1
BEGIN
Raiserror ('SESSION ALREADY EXISTS (UPDATE)',16,1)
ROLLBACK TRANSACTION
END
END
END

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