Using An Open SQLTransaction In Order To Lock A Record...
Jun 2, 2005
Hello,I am trying to begin a transaction is ASP.NET that acts as a temporary lock on a record so that another web user can not gain access to that row of information. My problem is that when I begin the transaction, if the user then closes out of the browser completely, the temporary lock that is put on my table from the transaction does not go away. Further, I have no idea if it will or if there is a time range you can specifiy to do so.What I am wondering is if anyone has ever tried this before, or does anyone have a definite answer to the following question, "If I begin a transaction, and then I do NOT rollback or committ that transaction, will it ever rollback on its own and if so where can I set this time frame?"Thanks in advance for any help.
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Mar 27, 2008
Hi!
I recently run into a senario when a procedure quiered a table without a order by clause. Luckily it retrived data in the prefered order.
The table returns the data in the same order in SQL Manager "Open Table"
So I started to wonder what deterimins the sort order when there is no order by clause ?
I researched this for a bit but found no straight answers. My table has no PK, but an identiy column.
Peace.
/P
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Sep 19, 2007
hi all iam working on a ticketing application i want to avoid two users to book the same ticket the requirement is as follows
1. the system should show all the available tickets which is not yet booked
2.when two users book the ticket at the same time time it should not allow the two persons to update at the same tme
the main aim is to avoid data concurency
how can i get this done
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Oct 3, 2000
When I connect to SQL to select(or insert,update) a record in MyTable, I want to restrict nobody can access it. How can I do? Can you give me an example about (or documentation)?
Thanks in advance.
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Nov 11, 2004
Please help! I have a VB application used by multiple users. MS SQL 2000 backend.
When a user opens a record for editing, it want to mark the record as locked so that if other users try to open this record, it will not be available.
Currently, I'm using a programmatic method that basically sets a field 'lock" to 1 if the record is in use and 0 if not in use. But this has the side affact of locking the record if the user reboots their workstation. In addition, I don't believe that this is the best method and approach to achieve my goal.
Thanks very much for your help in advance. All ideas are welcome.
crownlog
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Jan 2, 2004
hi,
using VB 6.0, sql server 7.0, ADO 2.5
i will tell my requirement. i have a tran. window there i will select a chart number of a patient and do some changes and will go to next window for doing some other modification for the same patient, and again will go to other window. by this time don't allow other users to access the same patient chart number. should get a message like record locked by some other user.
please help me to solve this issue
prince
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Mar 10, 2004
i have an app that insert multiple rows into a table in sql using insert statments. i use a begin trans and commit trans.
here is the setup i have a table that contains 100 rows. i insert another 25 rows. in another app i try to edit a record in that table (a record from the first block of 100) i can't edit the record because my first app has not done its commit trans yet. i don't understand why i can't edit a record that was already in the table. i'm not trying to edit one of my newly inserted records.
please advise,
Thanks
Thomas
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May 29, 2008
hi
I want to lock the record on select query so that no other user can update this record, is it possible and i want to unlock record when use stop view this record.
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Jul 9, 2006
Suppose there is a SQL Server table with a trigger behind it.
Suppose a client VB (or VBA) program is trying to update a certain record in that table, say record #1, by issuing the update statement:
RS.update
My Question:
When is SQL Server starting to lock that record (record #1) ?
Right after the RS.update is issued OR after the trigger has been executed ?
________________________________
Thanks in advance.
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May 27, 2008
I run a query "BEGIN select * from NT_ins_params_S WITH (HOLDLOCK,ROWLOCK) where...... and load the result into an ADO object. I need to lock the row untill I am done processing and I thought that (HOLDLOCK,ROWLOCK) will do the job but it does not. What is the correct way for locking?
I am using sql 2000 server and interfacing with it using a program written in C#
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Aug 30, 2005
Can I lock the record which I am selecting ?
I want this lock is row level,not transaction level.
How to do it,please tell me.
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Apr 16, 2007
Hi,
Any one can help me with the following requirement:-
. Checking the record if its lock before issues any statement
Any sample will be helpful
Best Regards
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Oct 3, 2007
I have a Sql Express Database that I want to access from a remote tablet application. When the remote user accesses a record (which is a form + ink), I can't have anyone else accessing that record and drawing ink on the record's form, unitl the first user is done. How do I prevent access to that record in a user friendly way until the remote user is done and has updated his changes to the database?
thanks!
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Feb 16, 2015
I have express edition [advance] of sqlserver 2008 r2 , is it possible to trace every event with out using profiler as u know it does not ship with it.
Basically i want to see how locks are taken and released in each isolation level when query is executed. I am using
SELECT resource_database_id, t.resource_type , t.resource_associated_entity_id,partitions.index_id,blocking_session_id,
indexes.name as index_name,o.name,
t.request_status, t.request_mode,t.request_session_id,
t.resource_description
[code]....
But i am not sure of the order becuase total_elapsed_time is same for many locks
like
resource_typeresource_associated_entity_idrequest_session_idrequest_modeindex_namenameresource_description
DATABASE051SNULLNULL
OBJECT209427886651Sch-SNULLwt
OBJECT209427886652IXNULLwt
PAGE7205759715088793652IXPK_wtNULL1:204815
KEY7205759715088793652XPK_wtNULL(4fb98fd9bfad)
DATABASE052SNULLNULL
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Aug 5, 2014
I need to discover the actual order in which locks are acquired on a table during a query.
This with a goal of analyzing the lock order of queries against the same table to prevent deadlocks.
I'm using SQL Server 2008 R2.
From Management Studio I execute:
begin transaction
<my query>
exec sp_lock
rollback transaction
In the output I see interesting information about which locks are acquired, but:
- are this locks ordered by the time they're acquired? That is, can I be sure that lock at row n is acquired before lock at row n+1?
- if not, how can I get this information?
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May 26, 2008
Hi,
I have few views in SQL Server 2005. In Design View, the results of View are ok. In OPEN VIEW option, records are not sorted correctly, ORDER BY is ignored.
What could be the reason for this ?
Thanks a lot in advance!
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Dec 4, 2006
I have an access 2003 Data access page published to the web that gets its data successfully from an MS SQL 2005 server. I need the "page when it opens" to display a new / blank record (not the first record in the table as it does by default) any pointers would be nice thanks Pete...
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Dec 22, 2006
I want to retrieve data from SQL server database table I also want to get the order number of each record also For example consider the following table I want to get one (1) associated with A, Two (2) associated with B Three (3) associated with E Name Mark A 10 B 9 E 10 How can I do this?
I want to retrieve data from SQL server database table
I want to get the order number of each record also
For example consider the following table
I want to get one
Name Mark
A 10
B 9
E 10
(1) associated with A,
Two (2) associated with B
Three (3) associated with E
How can I do this?
Please help me
hopefully
Sujithukvl
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Feb 13, 2008
We have a linked server configured on our SQL Server 2005 server that points to our iSeries. A step in a scheduled job successfully updates data in tables on the iSeries using an update query and the 4-part naming convention (job reports success and updates can be verified), but it appears to leave locked records and open connections on the iSeries. No open sessions showing in SQL Activity Monitor.
The linked server is configured using Microsoft's OLEDB Provider for DB2. Are there additional settings that can be configured on the linked server to prevent this behavior or is this an issue that need needs to be addressed on the iSeries? A timeout setting perhaps (not sure if this fixes the record locks though)?
Any help is greatly appreciated.
KS
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Sep 14, 2007
I'm using the Merge transformation to merge two sorted tables on four sort fields.
It all looks OK until several records share some of the same sort fields.
For example if table 1 contains
Zip Code(sort field 1) Cust Name(sf2) Cust Number(sf3) Record type(sf4)
1234 Bob 444 A
1234 Bob 555 A
and table 2 contains
Zip Code Cust Name Cust Number Record type
1234 Bob 444 B
1234 Bob 555 B
then the output order is
Zip Code Cust Name Cust Number Record type
1234 Bob 444 A
1234 Bob 555 A
1234 Bob 444 B
1234 Bob 555 B
and I would have expected
Zip Code Cust Name Cust Number Record type
1234 Bob 444 A
1234 Bob 444 B
1234 Bob 555 A
1234 Bob 555 B
Both input table are explicitly sorted just prior to the merge.
Any ideas?
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Jun 16, 2014
I am working on a query that needs to return the record order number with the most recent requested delivery date.
It seems to work most of the time, but I have found some glitches for some of the items.
example is my item 10702, it is showing 2 records (both valid ones)
Record 1 is order # 10450-0, requested delivery date 03/21/2014
Record 2 is order # 10510-0, requested delivery date 04/29/2014
I need to only get the records with the most recent delivery date, in this example that would be 04/29/2014
This query is what I have so far:
SELECT
s.PriorQuoteNumber
,s.PriorItemNumber
,s.PriorQuoteDate
FROM
(
SELECT
s.SalesQuoteNumberAS 'PriorQuoteNumber'
[code]....
WHERE s.rn = 1What am I missing in my query> how can I change it so it only returns the most recent date?
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Jun 29, 2015
I want to be able to open URLs in a new window in my SSRS report, and the URLs keep changing in every record. The problem is these links are not the only things present in the record, and there is other data present. I keep seeing examples where they are considering only a link to be present in the record with no other data.
Also the data in the record includes HTML tags and I checked the option that says "HTML - Interpret HTML tags as styles" on the placeholder properties window.
Example of data in the record:
Hello! Welcome to google, the most used search engine.
Click on www.google.com to go the website
So when I click on the www.google.com URL, it should open in a new window.
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Feb 2, 2007
I simply made my script task (or any other task) fail
In my package error handler i have a Exec SQL task - for Stored Proc
SP statement is set in following expression (works fine in design time):
"EXEC [dbo].[us_sp_Insert_STG_FEED_EVENT_LOG] @FEED_ID= " + (DT_WSTR,10) @[User::FEED_ID] + ", @FEED_EVENT_LOG_TYPE_ID = 3, @STARTED_ON = '"+(DT_WSTR,30)@[System::StartTime] +"', @ENDED_ON = NULL, @message = 'Package failed. ErrorCode: "+(DT_WSTR,10)@[System::ErrorCode]+" ErrorMsg: "+@[System::ErrorDescription]+"', @FILES_PROCESSED = '" + @[User::t_ProcessedFiles] + "', @PKG_EXECUTION_ID = '" + @[System::ExecutionInstanceGUID] + "'"
From progress:
Error: The Script returned a failure result.
Task SCR REIL Data failed
OnError - Task SQL Insert Error Msg
Error: A deadlock was detected while trying to lock variable "System::ErrorCode, System::ErrorDescription, System::ExecutionInstanceGUID, System::StartTime, User::FEED_ID, User::t_ProcessedFiles" for read access. A lock could not be acquired after 16 attempts and timed out.
Error: The expression ""EXEC [dbo].[us_sp_Insert_STG_FEED_EVENT_LOG] @FEED_ID= " + (DT_WSTR,10) @[User::FEED_ID] + ", @FEED_EVENT_LOG_TYPE_ID = 3, @STARTED_ON = '"+(DT_WSTR,30)@[System::StartTime] +"', @ENDED_ON = NULL, @message = 'Package failed. ErrorCode: "+(DT_WSTR,10)@[System::ErrorCode]+" ErrorMsg: "+@[System::ErrorDescription]+"', @FILES_PROCESSED = '" + @[User::t_ProcessedFiles] + "', @PKG_EXECUTION_ID = '" + @[System::ExecutionInstanceGUID] + "'"" on property "SqlStatementSource" cannot be evaluated. Modify the expression to be valid.
Warning: The Execution method succeeded, but the number of errors raised (4) reached the maximum allowed (1); resulting in failure. This occurs when the number of errors reaches the number specified in MaximumErrorCount. Change the MaximumErrorCount or fix the errors.
And how did I get 4 errors? - I only set my script task result to failure
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Nov 6, 2003
updatestring = "Update [Flow] set received=1 where flowid=@flowid"
insertstring = "Insert into [Flow] (barcode, copyid, floworder, recvdate, recvuser, recvdepartment) "
insertstring += "values (@barcode, @copyid, @floworder, @recvdate, @recvuser, @recvdepartment)"
is it can't use sqltransaction in the same table ???
when i not apply the sqltransaction, then the about two queries can work success, but when i apply the sqltransaction, then have an error in following.
error :
Object reference not set to an instance of an object
Source Error:
Line 278: message.Text = "Recebido o documento " & barcodetx.Text & "!!"
Line 279: Catch ex As Exception
<red>Line 280: objtransaction.Rollback()</red>
Line 281: message.Text = "Não se conseguiu registar!!"
Line 282: Finally
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Apr 4, 2006
Hi,
I am getting this error message
"This SqlTransaction has completed; it is no longer usable"
What's really strange is that I am getting this error from a page where I am not even using SqlTransaction.
How can I find the root cause and solve this problem?
Help Please!
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Oct 16, 2007
hi,Is it over head to use SqlTransaction(begin, commit, rollback) for a single transaction.am not using application block or enterprise library.only a single insert statement.
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Mar 15, 2006
Hi,
I use SqlTransaction to add record to the database. But I got a warning message on the "objTransact.Rollback()" that said "Variable 'objTransact' is used before it has been assigned a value, A null reference exception could result at runtime". what does this mean? how can I fix it? The following is the code. Thanks.
---------------------------------------------------------------------------------
Dim objTransact As SqlTransaction
Try
objConnect.Open()
objTransact = objConnect.BeginTransaction()
cmd.Connection = objConnect
cmd.Transaction = objTransact
-----do some sql query here............
objTransact.Commit()
Catch objError As Exception
objTransact.Rollback()
Finally
objConnect.Close()
End Try
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Oct 17, 2007
Hi,
I am getting the below error when using the SqlTransaction's for doing DML operations for different tables,
"System.Data.SqlClient.SqlException: Timeout expired. The timeout period elapsed prior to completion of the operation or the server is not responding."
Thanks in advance.
With regards,
Mani
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Apr 4, 2007
Hello,
I want to know, if you can use SqlTransaction even if you only execute one statement/query? I am particularly interested in Rollback(), which is called when the user presses the cancel button to abort a long file transfer.
Does rollback immediatley cancel the transfer and return control? Or, what is the best way of implementing a cancel option for transferring data?
Thank you
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Jun 27, 2006
I have a class which has connection, transaction object and BeginTransaction of that method opens the transaction. This class has an array of objects of a base class which refers to their derived classes at runtime and passes the reference of connection and transaction object to the derived class. Now from the main class I call BeginTransaction and then from any of the array element some insert update will be called using the same connection and transaction which has been opened from parent class.
I get the following exception while executing the sql statement in the method of derived class
Unhandled Exception: System.InvalidOperationException: ExecuteNonQuery requiresthe command to have a transaction when the connection assigned to the command is in a pending local transaction. The Transaction property of the command has not been initialized. at System.Data.SqlClient.SqlCommand.ValidateCommand(String method, Boolean async) at System.Data.SqlClient.SqlCommand.InternalExecuteNonQuery(DbAsyncResult result, String methodName, Boolean sendToPipe) at System.Data.SqlClient.SqlCommand.ExecuteNonQuery()
I tried using isolation level but transaction control does not work. I can not change the design...
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Dec 31, 2007
I want to know if it's a good practice to use sql-transaction in both c# and sql procedures code.
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Jul 23, 2005
Hi All,I am using a SQLTransaction to insert records into a table. At onetime, there are 5000 or more records to be inserted one by one. Ittakes some 20-25 mins for the entire process to run.Another application accesses the same table.As long as the insert process within the transaction isn't completed,the second application is not getting any response from the server. Ieven tried to run a SELECT on the table in SQL Query Analyzer while theinsert process was running and it also did not respond till the timethe insert process finished!Is this normal that a transaction is locking up a table? How do Iovercome it? I am using IsolationLevel.ReadUncommitted for thetransaction.If I do not run the process within a SQLTransaction, the second processor running the SELECT in Query Analyzer does not hang.Thanks,Sanjeev Mahajan
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Apr 7, 2004
Hi
We are facing an acute situation in our web-application. Technology is ASP.NEt/VB.NET, SQL Server 2000.
Consider a scenario in which User 1 is clicking on a button which calls a SQL stored procedure. This procedure selects Group A of records of Database Page1.
At the same time if User 2 also clicks the same button which calls same SQL stored procedure. This procedure selects Group B of records of Database Page1.
So, its the same Page1 but different sets of records. At this moment, both the calls have shared locked on the Page1 inside the procedure.
Now, in call 1, inside the procedure after selecting Group A of records, the next statement is and update to those records. As soon as update statement executes, SQL Server throws a deadlock exception as follows :
Transaction (Process ID 78) was deadlocked on lock resources with another process and has been chosen as the deadlock victim. Rerun the transaction
We are able to understand why its happening. Its because, Group A and Group B of records are on the same Page1. But both the users have shared lock on the Page1. So, no one gets the exclusive lock in records for update, even though, the records are different.
How can I resolve this issue? How can I get lock on wanted rows instead of entire page?
Please advice. Thanks a bunch.
Pankaj
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