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 have a large SQL Database im building, in the database there is a table for each user with certain things listed. One problem is, sometimes in a few collums, there will be like 100things listed, instead of one line.
For Example:
Products in that some users will have 1 product like "apples" but others will have many more products.
What is the most effective way of listing the data? Create new tables? Seperate the products with comma's or spaces?
How do I do it, and keep the overall db size smaller?
Thanks
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();
}
I have two tables. Status and Fourhistory tables.Status table contains a status column with effectivestart and end dates as history. This column is having history at month level.
Fourhistory table maintains 4 columns as part of history with the use of effectivestart and end dates. Here history capturing is at day level.
Desired Result: I want to merge the status column into FourHistory table.Below i have given some possible sample scenarios which i face and the third table contains the expected ouput.how to achieve this in T-SQL query.
create table dbo.#Status(
ID varchar(50),
Status varchar(50),
EffectiveStartDate datetime,
EffectiveEndDate datetime,
Is_Current bit
[code]...
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
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.
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'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
Better method to detect records with one or more 0's, other than hard coding all of the potential values. For example, I need to detect account duplicates where the duplicate contains multiple/all 0's in the "MasterAccount" column:
DECLARE @Account TABLE(AccountNo varchar(3), MasterAccount varchar(10) )
INSERT INTO @Account
SELECT 'ABC','0000000ABC' UNION
SELECT 'DEF','0000000DEF' UNION
SELECT 'ABC','0000000000' UNION ---- unwanted duplicate
SELECT 'DEF','00000' UNION ---- unwanted duplicate
[Code] ....
Is there a better method than this?
Anyone know if there is method that can insert all record from a tablein an MS Access 2000 database to a table in MS SQL Server 2000database by a SQL statement? (Therefore, I can execute the statementin my program)--Posted via http://dbforums.com
View 3 Replies View RelatedHi,I am trying to write a method which needs to call a stored procedure and then needs to get the response of the stored procedure back to the variable i declared in the method. private string GetFromCode(string strWebVersionFromCode, string strWebVersionString) { //call stored procedure } strWebVersionFromCode = GetFromCode(strFromCode, "web_version"); // is the var which will store the response.how should I do this?Please assist.
View 3 Replies View RelatedHi,
I just have a Dataset with my tables and thats it
I have a grid view with several datas on it
no problem to get the data or insert but as soon as I try to delete or update some records the local machine through the same error
Unable to find nongeneric method...
I've try to create an Update query into my table adapters but still not working with this one
Also, try to remove the original_{0} and got the same error...
Please help if anyone has a solution
Thanks
Hi all,
I am a java developer having little bit knowledge in sql statements.
can any body guide me what is the effective way of using sql statement
to achieve the following goal.
here is the requirement.
1. There are 2 tables A & B.
2.The table 'B' may or maynot have an equivalent entry for the primary
key of table a.
3. select column1 (of A), column 2(of B) from table a and b.
4. now column2 should give a value, if there is a corresponding
entry in table b.other wise null.
5. at any time there may be 0 to 1 record in table b for the primary
of table a.
thanks in advance
krishna
I did a search of the forums and couldn't find any other threads on "Effective Dating" so please forgive me if this topic has already been covered.
Does anyone know of any support articles or tutorials covering the topic of "Effective dating" as a means for keeping a history for data?
I would like to keep a infinite history on certain tables and would like to avoid duplicating data structures if possible. Any suggestions?
Thanks,
JAndrews
My gut tells me this can't be done quite the way I'm hoping, but maybe someone has a little insight...
Is it possible to specify a specific timeframe for which triggers should be effective? I have some make-shift replication tasks which are currently done via pure insert/update queries and various times throughout the day. In the am our "target" table is completely wiped and repopulated from our "source" table which resides on a different server.
I'm hoping to setup update triggers throughout the day to catch changes to our "source" table. These triggers should only be active for a six-hour period throughout the day. Unfortunately true replication isn't an option here.
I can think of a couple ways to take care of this such as checking GETDATE() from the trigger itself and deciding whether or not to do anything, or perhaps scheduling a job to enable and disable triggers at the appropriate time. Is there a way to setup such a schedule for the trigger itself?
When I click on the properties of a 2005 sql server database and thenpermissions.If I select a group and then effective permission, I got an error,saying that "cannot execute as the principal server because the 'xxxgroup' does not exist, this type of principal cannot be impersonated,or you do not have permission (Microsoft SQL Server; Error: 15406)"I guess the error is valid, since the group does not exist in thedatabase as a user. If so, how do I get the effective permissions of agroup?
View 1 Replies View RelatedHi, I am looking for a sql statemnt that find the most related phrases, how to do that? For example, I want to find the related phrases bellow for the following phrase: "How to install the software"
1- "Installation does not work"
2- "installation"
3- "steps to install the software"
It's obvoius that phrase number 2 and 3 are related to that phrase, how to do that using sql?
Regards.
Dear SQL,
since I create some multi-language table - I want to allow finding unicode text
so I made the field: Key_Words" (ntext)
It will have a string that can include some words in different languages, so that I can find by using:
SELECT Key_Words FROM MyTable WHERE Key_Words LIKE '%" & MyVar & "%' "...
The problem is that I can not apply clustered index on ntext field (or *any* index...)
Any ideas how to deal with it ?
Can anyone provide me with some insight on tracking the history of my data using "Effective Dating"? I would like to keep track of an infinite history for many of the tables in my database and am trying to avoid duplicating data structures if possible.
Any advice on this topic would be appreciated, I am most interested in any links to tutorials or support articles on subject that you may know about. I have searched the web and the forums section and have not come across much.
Thanks,
JAndrews
I have a table with a single effective date, rather than both a start and stop date. I have to be able to match up this table to another one with service information in it and am not sure how to get the correct record selected.
So in table one I have a personID, effective date, and lots of other fields. There are also multiple records for each personID, so say personID 1 has records with effective dates of 1/1/2007, 6/1/2007, and 1/1/2008.
Table two has personID, Service Date, and lots of other fields.
So if I am looking to match up the effective row from table one to a record in table two with a service date of 8/1/2007, how do I get the db to locate and return the record with an effective date of 6/1/2007, and only this record?
i have 3 tables having refrential integrity on id on column on each table
TABLEA contains 5 million rows
TABLEB contains 50 thousand rows
TABLEC contails 5 thousand rows
i have a proc that have 3 in parameter that are actually values of some of the columns in that table one parameter for each table.what is the optimized way to write query to get records on the basis of in parameters from these tables.