Try Catch
May 13, 2008
Hi!
I'm trying to use Try Catch together with transaction handling but it seems like it doesn't do Rollback although I produce an error.
It looks something like this:
DECLARE @soID INT
BEGIN TRY
BEGIN TRANSACTION
UPDATE Serviceobjekt
SET ServiceobjektstypID = 13
WHERE ServiceobjektID = 26555
UPDATE .... 2 more tables
INSERT INTO Serviceobjekt (
Namn...)
VALUES ('XXXX')
SET @soID = @@IDENTITY
INSERT INTO Atgard (
Namn, ServiceobjektID)
VALUES ('sssss',@soID)
COMMIT TRANSACTION
BEGIN CATCH
IF @@TRANCOUNT > 0
ROLLBACK
END CATCH
I get after changing some id's in the where clause which I know is wrong I get a result like this:
(0 row(s) affected)
(0 row(s) affected)
(1 row(s) affected)
(0 row(s) affected)
Shouldn't it be 0 rows affected on all if just one update or insert statement is wrong?
/Magnus
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Feb 15, 2007
Hi,
I'm having trouble with a Script Component in a data flow task. I have code that does a SqlCommand.ExecuteReader() call that throws an 'Object reference not set to an instance of an object' error. Thing is, the SqlCommand.ExecuteReader() call is already inside a Try..Catch block. Essentially I have two questions regarding this error:
a) Why doesn't my Catch block catch the exception?
b) I've made sure that my SqlCommand object and the SqlConnection property that it uses are properly instantiated, and the query is correct. Any ideas on why it is throwing that exception?
Hope someone could help.
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May 15, 2007
hi all,
All of a sudden my application started crashing when trying execute dml statements on sql server mobile database (sdf file). Frustating thing is that whole application crashes without any error message. this happens for all kinds for DML statement but not all the time. Sometimes it would fail for delete statement such as delete from table; or for insert into statement
my problem catch does not catch the error. There is no way to find out teh what is causing this error
SqlCeConnection sqlcon = new SqlCeConnection("
Data Source = '\Program Files\HISSymbol\HISSymboldb.sdf';"
);
SqlCeCommand sqlcmd = new SqlCeCommand();
sqlcmd.CommandText = Insert into company('AA', 'Lower Plenty Hotel');
sqlcmd.Connection = sqlcon;
SqlCeDataReader sqldr = null;
try
{
sqlcon.Open();
//use nonquery if result is not needed
sqlcmd.ExecuteNonQuery(); // application crashes here
}
catch (Exception e)
{
base.myErrorMsg = e.ToString();
}
finally
{
if (sqlcon != null)
{
if (sqlcon.State != System.Data.ConnectionState.Closed)
sqlcon.Close();
sqlcon.Dispose();
}
}//end of finlally
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Jan 15, 2007
Hi
for MS SQL 2000
how can I do ?:
INSERT INTO [Users] (Name)
SELECT Names FROM OtherUsers
I am having an UNIQUE INDEX on [Users].Name
how can I avoid an error ?
if the [Users].Name allready exists I want to jump over the error and keep on inserting
thank you for helping
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Apr 22, 2008
Is it any better than using @@ERROR?
It doesn't seem so
Any opinions?
Brett
8-)
Hint: Want your questions answered fast? Follow the direction in this link
http://weblogs.sqlteam.com/brettk/archive/2005/05/25/5276.aspx
Add yourself!
http://www.frappr.com/sqlteam
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May 22, 2008
Hi I use Try catch and transactions in one of my stored procedures.
Inside I make a call to another stored procedure.
Is it possible to roll back the outer sp?
Please advise.
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Oct 7, 2007
Hello!
Try this (-:
BEGIN TRY
SELECT *
FROM NonExistentTable ;
END TRY
BEGIN CATCH
PRINT 'catch me if you can' ;
END CATCH ;
/*
results in:
Msg 208, Level 16, State 1, Line 2
Invalid object name 'NonExistentTable'.
statement not printet */
BEGIN TRY
BEGIN TRY
SELECT *
FROM NonExistentTable ;
END TRY
BEGIN CATCH
PRINT 'catch me if you can' ;
END CATCH ;
END TRY
BEGIN CATCH
PRINT 'catched?'
END CATCH ;
-- same behaviour
CREATE PROC catchme
AS
BEGIN
BEGIN TRY
SELECT *
FROM nonexistingtable ;
END TRY
BEGIN CATCH
PRINT 'catch me if you can'
END CATCH ;
END ;
BEGIN TRY
EXEC catchme ;
END TRY
BEGIN CATCH
PRINT 'catched' ;
END CATCH ;
-- prints "catched"
BEGIN TRY
EXEC catchnonexistingproc ;
END TRY
BEGIN CATCH
PRINT 'catched again' ;
SELECT error_state()
END CATCH ;
-- prints "catched again"
BEGIN TRY
RAISERROR ('catch this' , 10 , 1) ;
END TRY
BEGIN CATCH
PRINT 'hello' ;
END CATCH ;
-- no hello
BEGIN TRY
RAISERROR ('catch this' , 11 , 1) ;
END TRY
BEGIN CATCH
PRINT 'hello' ;
END CATCH ;
-- prints hello
CREATE PROC catchme2
AS
BEGIN
BEGIN TRY
RAISERROR ('catch this' , 10 , 1) ;
END TRY
BEGIN CATCH
PRINT 'CATCH ME IF YOU CAN' ;
END CATCH ;
END ;
BEGIN TRY
EXEC catchme2 ;
END TRY
BEGIN CATCH
PRINT 'gotcha?' ;
END CATCH ;
-- prints only "catch this"
CREATE PROC catchme3
AS
BEGIN
BEGIN TRY
RAISERROR ('catch this' , 20 , 1) ;
END TRY
BEGIN CATCH
PRINT 'CATCH ME IF YOU CAN' ;
END CATCH ;
END ;
BEGIN TRY
EXEC catchme3 ;
END TRY
BEGIN CATCH
PRINT 'gotcha?' ;
END CATCH ;
-- prints "CATCH ME IF YOU CAN" ;-)
See also
-- ms-help://MS.SQLCC.v9/MS.SQLSVR.v9.en/udb9/html/3a5711f5-4f6d-49e8-b1eb-53645181bc40.htm
The above behaviour is as described in BOL, but
comparing to other languages such as Java, C#, PL/SQL
I would expect that catch always catch unless you take the power from the machine, special
in the case for "catchnonexistingproc". Remark the different behaviour compared to "nonexistingtable"
Documentation shows not example for non existing proc!
That catch doesn't catch "is as bug". So is the catch of non existing proc a bug in the bug? ;^)
I hope not, because it is the behaviour we want...
Greetings
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Feb 26, 2007
I want to use a try/catch to catch any error with this datareader so if no data then exit sub, eventually I will create custom error pagebut for now I just want to exit sub so following sql statements are not executed. I get the following problem when I try to close connection.this was not a problem before using try and catch, do I have in right place? Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load 'declare vars Dim iPreqid As String = CStr(Session("iPreqid")) Dim sql As String = "select * from Vrequest where req_id = '" & iPreqid & "'" 'Connection String value Dim conn As String = ConfigurationManager.ConnectionStrings("LoansConnectionString").ConnectionString 'Create a SqlConnection instance Using myConnection As New SqlConnection(conn) Dim myCommand As New SqlCommand(sql, myConnection) 'declare sqldatareader Dim dbReader As SqlDataReader Try myConnection.Open() myCommand.ExecuteNonQuery() dbReader = myCommand.ExecuteReader 'Initialize reader dbReader.Read() 'assign reader index values using column names to controls Label8.Text = CStr(dbReader("User_Name")) Label11.Text = CStr(dbReader("NHI")) Label9.Text = CStr(dbReader("Event_Number")) Label10.Text = CStr(dbReader("ACC_Number")) Label7.Text = CStr(dbReader("Required_Date")) Label1.Text = CStr(dbReader("Title")) Label3.Text = CStr(dbReader("address1")) Label4.Text = CStr(dbReader("Birth_date")) Label2.Text = CStr(dbReader("surname")) Label5.Text = CStr(dbReader("home_phone")) Label21.Text = CStr(dbReader("firstname")) Label20.Text = CStr(dbReader("delivery")) Label22.Text = CStr(dbReader("ward")) Label23.Text = CStr(dbReader("request_date")) Catch ex As Exception Session("exception") = ex exit sub End Try End Using 'if connection not closed then close If (Not conn Is Nothing) Then myConnection.Close()<---------------------------------------->Name 'myconnection is not declared' myConnection.Dispose()<---------------------------------------->Name 'myconnection is not declared' End If
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Jul 2, 2007
Hi,
Here is the code:Try
If DS.Tables(0).Rows.Count = 0 ThenResponse.Write("Cannot delete an unexist row!")
Response.End()
End If
DS.Tables(0).Rows(0).Delete()
Catch BUG as Exception
Response.Write(Bug.Message)
End Try
I removed all the connection stuff..
What I don't understand is why if ds.table(0).rows.count is zero I still get Bug.Message? I did Response.End ...
Thank you.
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Mar 25, 2008
Protected Sub detailsview1_ItemDeleting(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.DetailsViewDeleteEventArgs)
Dim label2 As Label = CType(detailsview1.FindControl("label2"), Label)
Try
Catch sqlEx As SqlClient.SqlException
If sqlEx.Message.Contains("DELETE statement conflicted with COLUMN REFERENCE") Then
label2.Visible = True
label2.Text = "You cannot delete this Agent Type as it has a call weighting assigned to it, remove the weightings before you try to delete it"
e.Cancel = True
End If
End Try
End Sub Hi, Im using vb.net sql2005 and visual studio 2005
I have 2 tables which have a foregin key relationship. When i try to delete information from within one of my aspx pages it rightly comes up with an application errror, something along the lines of
DELETE statement conflicted with COLUMN REFERENCE constraint 'FK_callScore_agentType'. The conflict occurred in database 'Merlin_####', table 'callScores', column 'typeID'.The statement has been terminated.
I have looked around and can see people talking about using a try catch excpetion however i need to know how id implement this using the detailsview1_itemdeleting event. Ive never used this before and havent found a decent tutorial to help.So far i have this code but im stuck as im not sure that this is correct but more importantly what i put in the try method. Protected Sub detailsview1_ItemDeleting(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.DetailsViewDeleteEventArgs)
Dim label2 As Label = CType(detailsview1.FindControl("label2"), Label)
Try
(WHAT GOES HERE)
Catch sqlEx As SqlClient.SqlException
If sqlEx.Message.Contains("DELETE statement conflicted with COLUMN REFERENCE") Then
label2.Visible = True
label2.Text = "You cannot delete this Agent Type as it has a call weighting assigned to it, remove the weightings before you try to delete it"
e.Cancel = True
End If
End Try
End Sub Your help would be greatly appreciated
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Aug 21, 2007
Hi,
I have the following stored procedure which is added to the windows scheduler. When it is run I'm getting an "Invalid use of null error", therefore I need to capture and any errors but I'm not sure how to do this. Can someone help?
Thanks.
Code:
CREATE PROCEDURE [dbo].[usp_Reminders] AS
DECLARE @ReminderSent datetime
DECLARE @getRecords CURSOR
DECLARE @err int
SELECT E.[RL Staff No], E.Forename, E.Surname, C.CourseName, V.CourseDate , E.Email, V.ReminderSent
FROM empdetails.dbo.v_Employee E
INNER JOIN Validation V ON E.[RL Staff No] = V.[RL Staff No]
INNER JOIN empdetails.dbo.v_Course C ON V.CourseCode = C.CourseCode
WHERE V.Completed Is Null AND V.ReminderSent Is Null AND V.CourseDate <= dateadd(dd, -3, getdate())
order by e.[rl staff no]
SET @getRecords = CURSOR FOR
SELECT V.ReminderSent
FROM empdetails.dbo.v_Employee E
INNER JOIN Validation V ON E.[RL Staff No] = V.[RL Staff No]
INNER JOIN empdetails.dbo.v_Course C ON V.CourseCode = C.CourseCode
WHERE V.Completed IS NULL AND V.ReminderSent IS NULL AND V.CourseDate <= dateadd(dd, -3, getdate())
ORDER BY e.[rl staff no]
OPEN @getRecords
FETCH NEXT FROM @getRecords INTO @ReminderSent
WHILE @@FETCH_STATUS= 0
BEGIN
UPDATE Validation
SET ReminderSent = GetDate()
WHERE CURRENT OF @getRecords
FETCH NEXT FROM @getRecords INTO @ReminderSent
END
CLOSE @getRecords
DEALLOCATE @getRecords
GO
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Dec 11, 2006
HI,
i'm trying to execute some sql using the Try.. Catch blocks.
Following code does not execute in Catch Block
Begin
begin try
insert into dbo.Test values (1,'aaa')
-- here we are inserting int value in identity field...
END TRY
Begin catch
PRINT 'TEST'
SELECT
ERROR_NUMBER() AS ErrorNumber,
ERROR_SEVERITY() AS ErrorSeverity,
ERROR_STATE() as ErrorState,
ERROR_PROCEDURE() as ErrorProcedure,
ERROR_LINE() as ErrorLine,
ERROR_MESSAGE() as ErrorMessage;
END Catch
End
GO
Whereas the following block works fine and the Catch block executes.
Begin
begin try
Select 1/0
--This causes an error.
END TRY
Begin catch
PRINT 'TEST'
SELECT
ERROR_NUMBER() AS ErrorNumber,
ERROR_SEVERITY() AS ErrorSeverity,
ERROR_STATE() as ErrorState,
ERROR_PROCEDURE() as ErrorProcedure,
ERROR_LINE() as ErrorLine,
ERROR_MESSAGE() as ErrorMessage;
END Catch
End
GO
Any idea why is it so?
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Apr 13, 2008
can someone help me how to corect the query,
BEGIN TRY
INSERT INTO ORDERS VALUES( 1122,'BAC123' );
INSERT INTO ORDLINE VALUES( 1122,991,1 );
PRINT 'VERY GOOD'
END TRY
BEGIN CATCH
PRINT 'FALSE'
INSERT INTO LOGTAB ('BAC123',1122,991,1, ERROR_NUMBER,ERROR_MESSAGE);
END CATCH
i am getting error:
Msg 102, Level 15, State 1, Line 11
Incorrect syntax near 'ERROR_NUMBER'.
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Mar 14, 2007
hi there i have 2 questions about the TRY/CATCH statement that i have written below. any advice from more experienced persons would be highly appreciated. thankyou.
1. re the @ErrorMessage variable, i have seen this declared with a datatype of varchar(MAX), nvarchar(2048) and nvarchar(4000). which is the correct one for me to use?
2. do i need the statement 'RETURN @ErrorCode' at the end or is this redundant?
BEGIN CATCH
IF @@TRANCOUNT > 0
ROLLBACK TRANSACTION
DECLARE
@ErrorCode int,
@ErrorMessage nvarchar(4000),
@ErrorSeverity int
SELECT
@ErrorCode = @@ERROR,
@ErrorMessage = ERROR_MESSAGE(),
@ErrorSeverity = ERROR_SEVERITY()
IF EXISTS (SELECT *FROM Users WHERE Username = @Username)
RAISERROR('The username already exists.', 15, 1)
ELSE IF EXISTS (SELECT * FROM Users WHERE Email = @Email)
RAISERROR('The email already exists.', 15, 1)
ELSE
RAISERROR(@ErrorMessage, @ErrorSeverity, 1)
RETURN @ErrorCode
END CATCH
END
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Dec 27, 2006
how to try-catch sp_addrolemember?
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Jul 20, 2005
Is there something like exception handling in T-SQL?For example, how to catch an error of convertion at thissample:CREATE PROCEDURE SP@param VARCHAR(50)AS BEGINDELCARE @var INT-- try {SET @var = CONVERT( int, @param)-- } catch (error#245) {-- handle an error right here-- }ENDIt must be invisible for a caller of SP if something wrong inside SP.*** Sent via Developersdex http://www.developersdex.com ***Don't just participate in USENET...get rewarded for it!
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Jul 20, 2005
Hi everyone, I am using an SQL extended stored procedure to send emails in aDTS package using a cursor that goes through each row in a table.Email sending code below======================exec master.dbo.xp_smtp_sendmail@FROM = @sFrom,@FROM_NAME = @sFrom,@TO = @sRecepients,@subject = @sSubject,@message = @sBody,@type = N'text/html',@codepage = 0,@server =N'MYMAILSERVER'======================Fetch Next From EmailCursor ...Now the problem I have is that if an individual email address in invalidthen an error occurs and the whole DTS package falls over. What I would liketo be able to do is "catch the error", something like this (C# code used asexample)try{exec master.dbo.xp_smtp_sendmail@FROM = @sFrom,@FROM_NAME = @sFrom,@TO = @sRecepients,@subject = @sSubject,@message = @sBody,@type = N'text/html',@codepage = 0,@server =N'MYMAILSERVER'} catch {exec master.dbo.xp_smtp_sendmail@FROM = "arealaddress@mybusiness.com",@FROM_NAME = @sFrom,@TO = @sRecepients,@subject = @sSubject,@message = @sBody,@type = N'text/html',@codepage = 0,@server =N'MYMAILSERVER'}Is this possible??? Normally I would do all the email validation before theemail is entered into the database but unfortunately, I do not have accessto the application code so I am stuck doing it this way.Thanks in advanceMark
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Oct 20, 2007
Hi there,
My question is more "architectural" than technical.
One of our standard is to systematically enclose the code of our stored proc within a TRY/CATCH block.
What is your point of view?
Should a TRY/CATCH be included even for simple operations?
Are there any drawbacks?
Thanks!
EDIT: Thanks for your input.
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Apr 28, 2008
I have 3 procedures where the first one calls the second one and the second one calls the third one. All procedures have try..catch blocks and transactions. In the third procedure I declare an INT variable and try to give it the value 'A', to create an error. This makes the code in the catch block to run. In the catch block I rollback the transaction and return 1. It then returns to the 2nd procedure, but here I get the exception "Transaction count after EXECUTE indicates that a COMMIT or ROLLBACK TRANSACTION statement is missing. Previous count = 2, current count = 0. Is there I way to keep running the code in the second procedure without getting this error? I take care of the return value from the 3rd procedure which is 1 so I know that there was an error in the third procedure but I want to run the code below the procedure call to the 3rd procedure in the second procedure, is there I way to do this?
I tried to have a transaction only in the first procedure but then I get this error "The current transaction cannot be committed and cannot support operations that write to the log file. Roll back the transaction."
What shoule I do to continue running the code in procedure 2 and procedure 1 after the procedure calls? In real life I have another scenario but the code below is just an easy example that creates the same error that my real procedures create.
Procedure 1:
Code Snippet
ALTER PROCEDURE [dbo].[ProcFirst]
AS
BEGIN
-- SET NOCOUNT ON added to prevent extra result sets from
-- interfering with SELECT statements.
SET NOCOUNT ON;
BEGIN TRY
DECLARE @return int
BEGIN TRANSACTION
EXEC @return = [dbo].[ProcSecond]
IF @return <> 0
BEGIN
SELECT 'return value <> 0 i ProcFirst'
RETURN 1
END
IF (XACT_STATE()) = 1 COMMIT TRANSACTION
RETURN 0
END TRY
BEGIN CATCH -- Error-handling statements
-- End Transaction
IF @@TRANCOUNT > 0 BEGIN
IF (XACT_STATE()) = -1 ROLLBACK TRANSACTION;
IF (XACT_STATE()) = 1 COMMIT TRANSACTION;
END
SELECT 'catch ProcFirst', @ErrorMessage
RETURN 1
END CATCH
END
Procedure 2:
Code Snippet
ALTER PROCEDURE [dbo].[ProcSecond]
AS
BEGIN
-- SET NOCOUNT ON added to prevent extra result sets from
-- interfering with SELECT statements.
SET NOCOUNT ON;
BEGIN TRY
DECLARE @return int
BEGIN TRANSACTION
EXEC @return = [dbo].[ProcThird]
IF @return <> 0
BEGIN
-- End Transaction
IF @@TRANCOUNT > 0
BEGIN
IF (XACT_STATE()) = -1
BEGIN
SELECT 'RollBack transaction'
ROLLBACK TRANSACTION;
END
IF (XACT_STATE()) = 1
BEGIN
Select 'commit transaction'
COMMIT TRANSACTION;
END
END
SELECT 'return value <> 0 i ProcSecond'
RETURN 1
END
IF (XACT_STATE()) = 1 COMMIT TRANSACTION
RETURN 0
END TRY
BEGIN CATCH -- Error-handling statements
-- End Transaction
IF @@TRANCOUNT > 0
BEGIN
IF (XACT_STATE()) = -1 ROLLBACK TRANSACTION;
IF (XACT_STATE()) = 1 COMMIT TRANSACTION;
END
SELECT 'catch ProcSecond', @ErrorMessage
RETURN 1
END CATCH
END
3rd procedure:
Code Snippet
ALTER PROCEDURE [dbo].[ProcThird]
AS
BEGIN
-- SET NOCOUNT ON added to prevent extra result sets from
-- interfering with SELECT statements.
SET NOCOUNT ON;
BEGIN TRY
DECLARE @tal int
BEGIN TRANSACTION
SET @Tal = 'a'
IF (XACT_STATE()) = 1 COMMIT TRANSACTION;
RETURN 0
END TRY
BEGIN CATCH -- Error-handling statements
--End Transaction
IF @@TRANCOUNT > 0
BEGIN
IF (XACT_STATE()) = -1
BEGIN
SELECT 'RollBack transaction ProcThird'
ROLLBACK TRANSACTION;
END
IF (XACT_STATE()) = 1
BEGIN
Select 'commit transaction ProcThird'
COMMIT TRANSACTION;
END
END
RETURN 1
END CATCH
END
Please help me!
//Emelia
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Aug 15, 2006
How do you make an update cascade opperation if you want to set the PK to an excisting one?
I have a table where to post are the same only the PK differs, now I want to delete one but transfer it's dependecies. i.e redirect its references to the other post.
How can I do that using on update cascade/delete. I see a catch 22 coming up!
/Jonneponne
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Apr 12, 2006
Hi:
one of our study group members noticed a strange behavior and has the following question. Any thoughts are appreciated.
I am unable to understand as to why the CATCH block is not executed when an INSERT is made
On table T3 which is dropped after the first transaction.
The severity of Insert into t3 values (3) is Msg 208, Level 16, State 1, Line 2
Invalid object name 't3'.
BOL says TRY€¦CATCH constructs do not trap the following conditions:
Warnings or informational messages with a severity of 10 or lower.
Errors with severity of 20 or higher that terminate the SQL Server Database Engine task processing for the session. If an error occurs with severity of 20 or higher and the database connection is not disrupted, TRY€¦CATCH will handle the error.
Here is the script.
use tempdb
go
create table t1 (a int)
create table t2 (b int)
create table t3 (c int)
Begin tran
Insert into t1 values (1)
Insert into t2 values (2)
Insert into t3 values (3)
IF @@error <> 0
Rollback tran
else
commit tran
-------------------------------------------------------------
Select * from t1
Select * from t2
Select * from t3
-------------------------------------------------------------
Drop table t3
-------------------------------------------------------------
Set xact_abort on
Begin try
Begin tran insertNow
Insert into t1 values (1)
Insert into t2 values (2)
save tran insertNow
Insert into t3 values (3)
commit tran insertNow
End try
Begin Catch
IF (XACT_STATE()) = -1
BEGIN
PRINT 'The transaction is in an uncommittable state.' +
' Rolling back transaction.'
ROLLBACK TRANSACTION insertNow
END;
-- Test if the transaction is active and valid.
IF (XACT_STATE()) = 1
BEGIN
PRINT 'The transaction is committable.' +
' Committing transaction.'
COMMIT TRANSACTION insertNow
END
End Catch
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Jun 1, 2006
Hi, I am trying to write a trigger in SQL 2005 and am running into a lot of issues. Here is my code
BEGIN
BEGIN TRY
DECLARE @count int
--check for timeon which is greater than timeoff
SET @count=0
SELECT @count=count(*)
FROM IVRCONFIG.dbo.C_GROUP_HOURS a WITH (NOLOCK),inserted i
WHERE a.XFER_GROUP = i.XFER_GROUP
AND a.DAY_OF_WEEK = i.DAY_OF_WEEK
AND a.TIMEON = i.TIMEON
AND a.TIMEOFF < a.TIMEON
IF @count<>0 RAISERROR (50001,16,1);
END TRY
BEGIN CATCH
RAISERROR
END CATCH
END
The error I specify is one I added to sys.messages. Can anyone tell me where I am going wrong??
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Feb 6, 2008
Hey,Here's yet another question for you more knowledgeable than me Up to this point I have been using a try/catch statement when dealing with SQL, for exampleint result = 0;try{result = Int32.Parse(command.ExecuteScalar().ToString());}catch{result = 0;}But I read up one some error handling and I have no idea how to solve this anymore. Since I'll be using the catch block to catch exceptions, something like thiscatch (SqlException){throw;}So I was wondering what is the good, standard practice for dealing with this since I need the catch statement to set result to zero or I would end up with an error.Thanks in advance,Sixten
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May 9, 2008
Hi,
I am looking for a way to record all sql server (express) activities.
is there a script or a way to do this,
thanks
Cemal
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Feb 27, 2004
Hi. I am executing a stored procedure. The stored procedure raises an error and all I need is to catch this error. Pretty simple, but it only works with an ExecuteNonQuery and not with an Executereader statement. Can anybody explain to me why this happens?
Here's the sp:
CREATE PROCEDURE dbo.rel_test
AS
select 1
raiserror ('My error.', 11, 2)
return
GO
Here's the ASP.Net page:
<% @Page Language="VB" debug="True" %>
<% @Import Namespace="System.Data.SqlClient" %>
<script runat="server">
Public Function RunSP(ByVal strSP As String) As SqlDataReader
Dim o_conn as SqlConnection = New SqlConnection(ConfigurationSettings.AppSettings("connectionstring"))
AddHandler o_conn.InfoMessage, New SqlInfoMessageEventHandler(AddressOf OnInfoMessage)
o_conn.Open
Dim cmd As New SqlCommand(strSP, o_conn)
cmd.CommandType = System.Data.CommandType.StoredProcedure
Dim rdr as SqlDataReader = cmd.ExecuteReader(System.Data.CommandBehavior.CloseConnection)
rdr.Close()
cmd.Dispose()
Response.Write(o_conn.State)
End Function
Private Sub OnInfoMessage(sender as Object, args as SqlInfoMessageEventArgs)
Dim err As SqlError
For Each err In args.Errors
Response.Write(String.Format("The {0} has received a severity {1}, state {2} error number {3}" & _
"on line {4} of procedure {5} on server {6}:{7}", _
err.Source, err.Class, err.State, err.Number, err.LineNumber, _
err.Procedure, err.Server, err.Message))
Next
End Sub
Sub Page_Load(sender as Object, e as EventArgs)
RunSP("rel_test")
End Sub
</script>
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Oct 24, 2005
Hi!
I'm doing a class for working with MSDE.
My goal (as you understood) is to separate business and data layers.
I'm facing the following problem:
I have to use something like cmd.Parameters.Add("@Name", value) in my business layer to avoid using
cmd.Parameters.Add("@Name", SqlDbType.NVarChar, 16, value) where you can see that 'SqlDbType.NVarChar' doesn't respect the 'rules' for separating Data/Business layer.
Does it cost a lot to use a 'light' constructor (more job for the SQL engine to convert datas)?
Do I have to do a special function in my 'Data class' to convert an Int32 to a SqlDbType.Int for example?
I could see that Parameters.Add is deprecated and I have to use Parameters.AddWithValue in .Net 2 when you have only 2 parameters.
Is there a better way to handle that?
Thanks for your replies ;)
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Jul 29, 2004
Hi
Is there a way to run VB code when a trigger is executed ? Maybe to define a VB event that will occur when a trigger is executed ??
I've tried googling...
Thanks,
Inon.
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Dec 12, 2007
Hello, everyone:
I want to know if there is an event in profiler can catch web application name. If yes, which one? For example, there is SP named sp_storedprocedure that is called by www.web.com and www.web.com/forumdisplay.php?f=23. I want create a profiler trace that can catch www.web.com or www.web.com/forumdisplay.php?f=23 calling sp_storedprocedure. Any suggestion is great appreciated.
Thanks
ZYT
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Apr 10, 2008
Lets say that within a procedure, you start a transaction. Within the transaction there are three blocks of code, each surrounded by try/catch blocks. The first statement succeeds, but the 2nd fails and doesnt enter its catch block because for example it was inserting into a table that didnt exist at the time the procedure ran. So then, the engine will terminate the procedure and return, but there will still be a transaction open. How can you handle this situation?
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Oct 10, 2006
Can anyone give a template for a stored procedure which involves a transaction and has a TRY CATCH block too...
Thanks in advance.
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Sep 10, 2007
I've inherited a SQL 2005 Server with a major problem. It's been badly admin'd for ages.
It's got a 250gb disk with 3% space free. The disk is 93% fragmented. There is a sql data file of 231gb on that volume that i'm trying to shrink as it has 92gb of free space on it apparently. It won't shrink because the fragmentation is too bad - it just hangs for 2 days then times out. I've tried shrinking the files and database to no avail. I can't defrag as it just says it's finished after 2 minutes and doesn't do anything.
Any suggestions or am I screwed?
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May 9, 2006
I'm looking for a discussion of the pros and cons of using TRY/CATCH as an error handler in a standard fashion with Stored Procedures. I've been using SQL Server for some time, and am accustomed to an approach of error handling in SPs that returns control from an SP via a common exit routine.
Has anyone defined an approach they would consider sharing? I realize that the reasons for standardizing on an approach includes requirements to your specific situation, so there are likely no perfect answers. I understand the basics of TRY/CATCH in SQL Server. Specifically, I'm looking for an approach where a common "Catch Handler" is used, paying attention to the issues around COMMIT/ROLLBACK.
If there are any threads that discuss this, let me know; I've performed a seach and found nothing so far.
Thanks,
Chuck
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May 17, 2008
Hi guys!
the problem is this:
I have a procedure that execute a function and i want to catch the return function value but i'm getting a null value.
I'm using:
exec @a = <function>
but the @a variable is allways null...
If i exec the function directly, i get the correct value.
What am i doing wrong?
Thanks in advance.
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