Hello,
I have a database programmer who in his latest application has deployed manual record locking into code to release certain records to certain users of the application at specified times.
Does anyone know how manual record locking will affect the SQL 2K system? If at all? Are there some standard practices with manual record locking that should be enforced?
Thanks,
Brent.
Hi,
We're running a Sage CRM install with a SQL Server 2000 database at the back end. We're using the Sage web services API for updating data and a JDBC connection to retrieve data as it's so much quicker.
If I retrieve a record using the JDBC connection and then try and update the same record through the web services, the query times out as if the record is locked for updates. Has anyone experienced anything similar or know what I'm doing wrong? If I just use DriverManager.getConnection() to establish the connection instead of the datasource, and then continue with the same code I don't get these record locking problems. Please find more details below.
Thanks,
Sarah
The JDBC provider for the datasource is a WebSphere embedded ConnectJDBC for SQL Server DataSource, using an implementation type of 'connection pool datasource'. We are using a container managed J2C authentication alias for logging on.
This is running on a Websphere Application Server v6.1.
Code snippet - getting the record thru JDBC:
DataSource wsDataSource = serviceLocator.getDataSource("jdbc/dsSQLServer");
Connection wsCon = wsDataSource.getConnection();
// wsCon.setAutoCommit(false); //have tried with and without this flag - same results
Statements stmt = wsCon.createStatement();
String sql = "SELECT * FROM Person where personID = 12345";
ResultSet rs = stmt.executeQuery(sql);
if(rs.next()){
System.out.println(rs.getString("lastName"));
}
if (rs != null){
rs.close();
}
if (stmt != null) {
stmt.close();
}
if (wsCon != null) {
wsCon.close();
}
Hello,
I need help in record locking. As soon as user retrieve records I want to lock those records in database. When other user try to retrieve records from the same table i want to retrieve records those are not locked by other user. How do I do this? Please help...
Thanks in a millian.
Sarika
Project spec:
If user is making Delivery Order for sales order,
the other user cannot make Delivery order for same sales order
How to lock a sales-order record, so other user cant use it, except for reporting (read only). I dont want to use a field since it has a lot of weakness. I am using VB6 and connect with ADO
Thanks
Currently I am working on asp.net Intranet system.I need some suggestion on records locking for Sqlserver & ASP.net.
I want to prevent two user to open the same record for modify.Means if some one has open one record (id=xxxxx) for modify then others should not be able to open same same record (id=xxxxx) for modify .otherwise if both user will open/update same record then information in database will not be updated correctly.
Any idea how we can do the record locking so that not two users can open same record(id=xxxxx) for modify.
Thanks in Advance
Arvind
I am writing a VB program, which needs to update record A in one table using transaction control (BeginTrans & CommitTrans). But due to the page-level locking, before the "CommitTrans", other users couldn't not read other records in the same table.
Is there any way that I can do the record/row level locking? If possible, could you provide me some VB source code? Such as how to use "DBCC ROWLOCK" or how to set for row-level locking.
Thanks for your kind help.
Hi all,
I'm working on a Planning Databse for a factory that allows jobs to be allocated to machines and to be given a priority. This info. is displayed on an Access 2000 form e.g.
MACHINE ONE MACHINE TWO
Priority Job Number Priority Job Number
1 J111 1 J654
2 J562 2 J865
3 j231 3 J821
Both the Production Manager and the Factory Manager have this form open at all times. The problem is this, if for example the Factory Manager changes the priority of a job on his PC, the change is not shown on the Production Managers PC (cos' his screen has not been refreshed with update) The Production Manager therefore has old data on his screen and could mistakenly think that the job priority had not changed at all...
I have managed to write some VBA code to get round this but I was wondering if there was any way of 'pushing ' changes to the front-end when they are made or of using record-locking etc. to achieve the same affect...
Thanks
M
I am running an Access 2000 front end and MS SQL2000 as a backend and I am having problems with record locking.
I have just found out that If you use ODBC then Access acts as if No Locks are set. In an ideal world I need the record to be locked by a user as soon as they move onto it. If not as soon as they start editing it?
Cheers.
Hi there,
Up until this point I've been quite lazy in trying to understand how record locking really works in SQL server however one of my applications now has a bug so the time has come for me to take the issue seriously.
Basically, a user clicks a button in my app and updates a field in a table in SQL Server (say at 10:34:55). At the almost exactly the same time (lets say 10:34:57) another user tries to update the same record (not necessarily the same field) but the second users update is not connected to the database.
How can I store the second users update and then commit to database once the first user is finished...is it possible or do i need to approach this from a different angle?
Thanks
I'm trying to figure out what happened.I have have two Tables in SQLServer called "Contacts", and "Jobs"Whenever someone changes a record in either table I update two fieldscalled "Modby" and "Moddt" with a trigger. The Trigger may alsocontain other things as well.Here's the wierd thing.If the Modby Moddt statement is the first statement in the trigger Idon't get a "record changed by another user" but if it comes later inthe trigger I do.I think it has something to do with the LockDelay Key but I'm not sure.Any Ideas?
View 3 Replies View RelatedIs there a way using ADO.NET to lock a record so that you can performan atomic Test and Set operation on one of its fields?I want to set an application level lock bit on a record's field (set itfrom 0 to 1) and at the same time determine that it was 0 before Ibegan and that I was the one who set it to 1, or that it was 1 before Igot to it (and thus I do not own the lock to the record).I don't see anything that explains if this can be done using ADO.NETusing MSSQL. Any help is greatly appreciated.
View 3 Replies View RelatedI found this interesting paper at http://ftp.sas.com/techsup/download/v8papers/odbcdb.pdf, comparing OLEDB to ODBC.
It says that OLEDB provides record locking where ODBC doesn't. I can't quite reconcile that statement; what does it mean? How is the access layer involved in determining type of locks used by the server in executing a statement?
.B ekiM
From SQL Server Books Online, there is a topic: Concurrency Effects, and did mention the following side effects:
- Lost updates.
- Uncommitted dependency (dirty read).
- Inconsistent analysis (nonrepeatable read).
- Phantom reads.
Can someone please tell me which type of Isolation Levels in the Database Engine to avoid the above side effects respectively.
For Record Locking issue:
Example, two editors make an electronic copy of the same document. Each editor changes the copy independently and then saves the changed copy thereby overwriting the original document. The editor who saves the changed copy last overwrites the changes made by the other editor.
This problem could be avoided if one editor could not access the file until the other editor had finished and committed the transaction.
For the above example, is it possible to do like this way:
Editor 1: SELECT and Lock a record
Editor 2: Before SELECT the record, check for the record whether it is locked or not. If it is not lock, then the record can be selected
Please advise.
Thanks.
I have built my own functions in the past that involve a timestamp and record lock column in each table (to support some other DB).
I am currently using SQL 2000 and was wondering if there is a better (OK, easier) way to lock records and even prevent edits from taking place when a record is open.
Any input appreciated.
I've been considering implementing a P2P Transactional Replication concept using three different sites. My qustion is:
Instead of have records only available for editing by specific sql servers (partitioning), can I implement some sort of record locking? For exampel all sql nodes have r/w access to all data unless one sql node has the record locked?
I have a problem with record locking / blocking within an application.The app is quite straight forward. Written in Delphi 5 using BDE toaccess a SQL 7 database (Win2K server).Every so often the users (when they bother to tell me) find that theapplication locks up and they are unable to work. No errors areproduced (error trapping in the app is good). They 'shout round' toeach other and get someone to exit the data entry screen. This seemsto free up the locking/blocking issue.There are about 50,000 records in the table (script below) and it isaccessed through a simple query (script below). All users will accessthis in the same way. I'm assuming that a new record is being editedwhen the problem occurs, but this shouldn't cause locking/blockinguntil it gets committed (right ?).The problem is tracking down the source of this and finding thepattern which I can work back from. I've used Erland's aba_lockinfoscript (a few months back admittedly so will re-visit this), butnothing obvious is jumping out at me.No other tables should be in use at this point.Any suggestions ?ThanksRyan/* Code for query component - users navigate to the record they needto editthere could be 15,000 records showing as outstanding - perhaps thisis the area that I need to re-visit so that less records can be edited? */SELECT *FROMPostReceivedWHEREToDelete = 0 ANDCompleted <> 1ORDER BYPostID/* Table in question */if exists (select * from sysobjects where id =object_id(N'[dbo].[PostReceived]') and OBJECTPROPERTY(id,N'IsUserTable') = 1)drop table [dbo].[PostReceived]GOCREATE TABLE [dbo].[PostReceived] ([PostID] [int] IDENTITY (1, 1) NOT NULL ,[Type] [varchar] (100) NULL ,[ClientsName] [varchar] (100) NULL ,[DateReceived] [datetime] NULL ,[EnteredBy] [varchar] (100) NULL ,[AssignedTo] [varchar] (100) NULL ,[DateAssignedTo] [datetime] NULL ,[Adviser] [varchar] (100) NULL ,[TargetDate] [datetime] NULL ,[CompletionDate] [datetime] NULL ,[Completed] [bit] NULL ,[KeyAccount] [varchar] (100) NULL ,[Notes] [text] NULL ,[Specific1] [varchar] (20) NULL ,[Specific2] [varchar] (20) NULL ,[Specific3] [varchar] (20) NULL ,[Specific4] [varchar] (20) NULL ,[Specific5] [varchar] (20) NULL ,[ToDelete] [bit] NULL ,[EnterUser] [varchar] (20) NULL) ON [PRIMARY] TEXTIMAGE_ON [PRIMARY]GO
View 3 Replies View Relatedcan someone pls show me a way to get an unique sequence at below senario:
PC1 & PC2 using their own local client progam to access to Database Server at SERVER1.
In the SERVER1, there is a table SEQUENCE in a database DATABASE1.
And the table's structure of SEQUENCE are SeqType & SeqNo.
Here is the sample data:
SeqType SeqNo
Invoice 100
DeliveryOrder 200
Now, how to prevent PC1 & PC2 to get a same Invoice No. if they request the Invoice No. at the same time?
Is it possible to lock the record Invoice when i perform a SELECT statement, then i update the Invoice to 101, lastly release the lock for Invoice?
pls advise. thanks.
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
I have a client who needs to copy an existing sale. The problem isthe Sale is made up of three tables: Sale, SaleEquipment, SaleParts.Each sale can have multiple pieces of equipment with correspondingparts, or parts without equipment. My problem in copying is when I goto copy the parts, how do I get the NEW sale equipment ids updatedcorrectly on their corresponding parts?I can provide more information if necessary.Thank you!!Maria
View 6 Replies View RelatedHi
I have a table with a user column and other columns. User column id the primary key.
I want to create a copy of the record where the user="user1" and insert that copy in the same table in a new created record. But I want the new record to have a value of "user2" in the user column instead of "user1" since it's a primary key
Thanks.
Hey all!
Sorry for the less then descriptive post title but I didn't find a better way to describe it. I'm developing an app in the express editions of VB and SQLserver. The application is a task/resource scheduler. The main form will have a datepicker or weekly overview and show all tasks scheduled per day. The problem is, I've got one or more people assigned to tasks and I wonder what's the best way to design this. Personally, I'd go for one Task table, a People table and a table that provides a link between them (several record per task, one for each person assigned linking TaskID and PplID). However, I don't see a nice way of showing this data to the end user, allowing him to edit/add etc on ONE screen.
To fix that the only way I see is just add columns to the Task table for every person with select boxes. This way everything can be done on one simple screen. This obviously does present some future issues.
On top of this, which people are available on a day varies and there should be an option to allow a user to set who is available on a specific day. Which would lead me to my first idea and add another table that would provide this. but then I'm having design issues again for the form.
I'm kinda stuck atm, can anyone shed some light on this. I'm sure there is an elegant way of doing this but I'm failing at finding it.
Thanks in advance,
Johan
I am attempting to create a multi-record file (as described in my last thread) and have found the following set of instructions very helpful:
http://vsteamsystemcentral.com/cs21/blogs/steve_fibich/archive/2007/09/25/multi-record-formated-flat-file-with-ssis.aspx
I have been able to create a sample file with two of my record types.
I now need to build on this further, because I have 9 record types in total that need to be extracted to a single flat file.
does anyone have any ideas how I might extend the example above to include more record types or know of another means of achieving this?
Thanks in advance for any help you might be able to provide.
Hi
Can anyone advise me as to how I can add the date and time to 2 columns in the sql server database for each record that is added. I'd prefer not to use the webform. Can sql server add the date automatically to the row?
thanks
Is that possible to restrict inserting the record if record already exist in the table.
Scenario: query should be
We are inserting a bulk information of data, it should not insert the row if it already exist in the table. excluding that it should insert the other rows.
Hi All,I have a table in SQL Server 2000 that contains several million memberids. Some of these member ids are duplicated in the table, and eachrecord is tagged with a 1 or a 2 in [recsrc] to indicate where theycame from.I want to remove all member ids records from the table that have arecsrc of 1 where the same member id also exists in the table with arecsrc of 2.So, if the member id has a recsrc of 1, and no other record exists inthe table with the same member id and a recsrc of 2, I want it leftuntouched.So, in a theortetical dataset of member id and recsrc:0001, 10002, 20001, 20003, 10004, 2I am looking to only delete the first record, because it has a recsrcof 1 and there is another record in the table with the same member idand a recsrc of 2.I'd very much appreciate it if someone could help me achieve this!Much warmth,Murray
View 3 Replies View RelatedHi Everyone-
i have a matrix report
and i want to switch the record background color with each record in the value column in that matrix report
e.g 1st record background color is gray and next record background color is white
and then the next record background color is gray ... and so on
can anyone help?
thanx
Maylo
Could anybody help me with the following scenario:
Table 1 Table2
ID,Date1 ID, Date2
I would like to link the two tables and receive all records from table2 joined on ID and the record from table1 that has the most recent date.
Example:
Table1 data Table2 Data
ID Date1 ID Date2
31 1/1/2008 31 1/5/2008
34 1/4/3008 31 4/1/2008
31 3/2/2008
The first record in table2 would only link to the first record in table1
The second record in table2 would only link to the third record in table1
Any help would be greatly appreciated.
Thanks
I've been looking for examples online to write a SPROC to get some data. Here are the tables.
Album_Category
AlbumCategoryID (PK, int, not null)
Caption (nvarchar(max), not null)
IsPublic (bit, not null)
Albums
AlbumID (PK, int, not null)
AlbumCategoryID (int, null)
Caption (nvarchar(max), not null)
IsPublic (bit, not null)
I need to return:
-[Album_Category].[AlbumCategoryID]
-[Album_Category].[Caption]
-[Albums].[Single AlubmID for each AlbumCategoryID]
-[Count of Albums in each AlbumCategory]
I hope I was fairly clear in what I'm trying to do. Any tips or help would be appreciated. Thanks.
I have a directory of user information. What I would like to do isallow someone to search for person X and then return not only theinformation for person X, but also the information for the next 15people following person X sorted alphabetically by lastname.So if someone searched for the lastname = "Samson", it would return:Samson, JohnSaxton, GregScott, HeatherSears, Rebecca.... (15 names following "Samson) ...How do you in SQL return a record set of X records starting atparticular record (e.g. lastname = "Smith)?Thanks in advance.
View 4 Replies View Related
Hello. I have a database with a record that has two columns locked. descrip1 and descrip2. they are both nvarchar(max) columns. These are the only two columns of the record that remain locked. I am certain no user is accessing the record. I have even moved a backup of the database to my testing computer and the lock still exists. How do I remove the lock from these two columns on that particular record.
I can edit these two columns on other records. I have researched "Unlock" on MSDN but it doesn't seem to apply to t-sql. Any help would be greatly appreciated.
Thanks. Gary.
I am trying to update a record in a table based off of criteria of another record in the table.
So suppose I have 2 records
ID owner type
1 5678 past due
2 5678 late
So, I want to update the type field to "collections" only if the previous record for the same record is "past due". Any ideas?
I have not yet succeeded in getting an aswer to this in a previous post, so I'll try again and rephrase the question
I have 2 fields, 1 called 'Created' the other 'Updated'
I would like to create a function, user procedure ,whatever in SQL something along the lines of...
FUNCTION myUID()
RETURN Date(Today)+Time(Now)+USERNAME
END FUNCTION
so that the value returned by the above pseudo code is something like '20080526T21:01:05.620SamL' where the date part is in yyyy0m0d format
I have got this working fine for the default 'Created' field but the calculated (and persisted) field comes up with something about being non-deterministic and refuses to play
Clearly something along these lines is a very straightforward requirement (I have it working fine in my 20+ year old database) , but have spent a week trying to get an answer (even from this forum) without success, so would be grateful for any help that you can provide me with to get round this barrier
Hi All,
I am trying to create package something like that..
1- New Customer table as OleDB source component
2- Lookup component - checks customer id with Dimension_Customer table
3- And if same customer exist : I have to update couple fields on Dimension_Customer table
4- if it does not exist then I have insert those records to Dimension_Customer table
I am able to move error output from lookup to Dimension_Customer table using oledb destination
but How can I update the existing ones?
I have tried to use oledb command but somehow it didnt work
my sql was like this : update Dimension_Customer set per_X='Y', per_Y= &Opt(it should come from lookup)
I will be appreciated if you can help me...