In what way is used optimistic concurrency?
I need to connect two tables together.
If you use optimistic concurrency at the same time, users will store data in a table?
In particular, I wonder what the difference is, if I save the aspx, or use optimistic concurrency.
I tried to implement Optimistic Concurrency in the Movie MVC 3 project.
1. I added a new property
[Timestamp]
[ConcurrencyCheck]
[DatabaseGenerated(DatabaseGeneratedOption.Computed)]
public byte[] RowVersion { get; set; }
2. Modified controller to execute
var movie = db.Movies.Find(model.Id);
db.Movies.Attach(movie);
TryUpdateModel(movie);
db.SaveChanges();
return RedirectToAction("Index");
3. Added the RowVersion as a hidden field to the View page
@Html.HiddenFor(model => model.RowVersion)
It didnot work for me, can someone pls point me to the right direction?
How should I solve simulation update, when one user updates already updated entery by another user?
First user request 'Category' entityobject, second user does the same. Second user updates this object and first user updates. I have field timestamp field in database that wa set to Concurrency Mode - Fixed.
This is how I update:
[Code]....
Exception never jumps...How should I handle this?
I have an application, that is accessing by number of users at the same time. Those users, who are accessing the application getting the same id. Here what i am doing in the code is, when they are creating new user i am getting a max id from DB and increasing the value to 1. So that they are getting same ID. so that i am facing concurrency in this situation. How to solve this problem. I need to display different numbers when the users click on NewUser. I am using SQL server 2008 and .NET 3.5 and C#.NET
View 2 RepliesI have an online flight reservation system that users can reserve flight ticket,my problem is in concurrency,i have a 'remaincapacity' field in my flight table(keep flight properties) and when a user want to get a ticket i first check this field an if the value is greater than number of ticket that user requested i subtract 'remaincapacity' and after that i allow user to reserve that ,how do in control concurrency?
View 2 RepliesDoes record locking (Pessimistic and Optimistic Locking) is applicable in ASP.NET application? If so, What is the pros and cons on doing this?
View 3 RepliesMy project includes a grid view with some updtable fields, some fields throw an error on update and some do not and it does not really make sense. WORK_STATION_ID does not cause an error, ROOM _ID cause an error, both are int? (I am using c#) and for update I use the code liste below.
[Code]....
[Code]....
I am trying to handle concurrency in my application. Basically if user A has a support ticket open which currently has a status of 'Active' and user 'B' opens the same ticket and closes it (changing its status to closed), I would expect a confict execepton to be thown when user 'A' tries to close the support ticket. For some reason this is not happening. I have checked that Update check is set to 'Always' in the dbml file. Here is an exerpt of my code. // Update 'Active' lead to 'Close'
[Code]....
i have a hotle reservation system.
when a user select a room i want that it lockes and an other person can not select it.
i think it`s better that i have a flag in my table and when a user select room value of is false and if cancle reservation ,i changed it true.an other person can see room that they have true value .
I have the following problem:- I have a Settings table which has a value column, that is incremented everytime a Job is created (I use Entity framework to add the job and to update the value increment). So, I have something like this:
[Code]....
The problem is: I have a asp.net with concurrent calls to SaveJob Method. In this code, the value is shared, and if I call SaveJob 5 times for instance, the value column is 3, because the scope is not "locking" the other transactions until It's done, and the value is shared. I want to have the following scenario: Call SaveJob 5 times;Value column in Settings table is 5;Call SaveJob 3 more times;Value Column in Settings table is 8. I tried to implement something like pessimistic concurrency in EF, but I had no success. Whats the best way to handle that without using SQL Server queries directly? (like 'lock' and 'unlock' etc)
I want to know how to handle the concurrency throughy code ? ie: I want to access the Concurrency issue or error ? Because if i get the concurrency user or issue I have to do some manipulation.
View 4 Repliesi am in the process of creating a restful service with WCF, the service is likely to be consumed by at least 500 people at any given time. What settings would i need to set in order to deal with this.
Here is a sample of what i have so far;
[Code]....
And this is an example of a method being called;
[Code]....
I've been quite impressed with dynamic data and how easy and quick it is to get a simple site up and running. I'm planning on using it for a simple internal HR admin site for registering people's skills/degrees/etc.
I've been watching the intro videos at www.asp.net/dynamicdata and one thing they never mention is how to handle concurrency control.
It seems that DD does not handle it right out of the box (unless there is some setting I haven't seen) as I manually generated a change conflict exception and the app failed without any user friendly message.
Anybody know if DD handles it out of the box? Or do you have to somehow build it into the site?
Actaully i developed an Asp.net website which has a PDA app part. The case is that employees from company come in the morning and get data in their PDA's and they work on them the whole day and in Evening they again come to office or from any web access they update the data on server. We did this through Web services because web services are remote methods so they could access that by only web access..
Now the problem is Concurrency that while syncing through web servies how to control Concurrency however their could be many employee who try to update data at a time.In web servies we receive DataTable from PDA application and do update or insert operations through LINQ with Sql Server.
Made my first application in aspx, and connect to mysql, the issue is how concurrency control (transactions), ie that when users log dam not, nor information loss...
View 3 RepliesHow to control concurrent requests for web sites?
View 1 RepliesI added a column of type "timestamp" to a table in SQL Server to use for concurrency control. I deleted all my tables from the Linq surface and then added them back. I see that the "Time Stamp" attribute is set to True for the timestamp column and False for all the other columns. I also see that the "Update Check" attribute is set to Never for all columns, including the timestamp column.
After watching some demo videos and reading some tutorials, I had expected to have to manually set the "Update Check" attribute values on the columns - to Never for all columns but the timestamnp column where it should be set to Always. But, before setting the "Update Check" to Always on the timestamp column, I decided to test it the way it was, and Linq seems to be doing the right thing - it seems to be using the timestamp column for concurrency control correctly even with "Update Check" set to Never on the timestamp column.
So my question is - does the fact that "Time Stamp" is set to True trump the "Update Check"? Or is there any other reason one could or should set "Update Check" to Always on a timestamp column? Is there any change in behavior?
I have a strange problem in my ASP.Net 3.5 application. When multiple users try to access the same page (which has some long running methods), the application crashes at a point where it tries to open a connection to the database (a static method inside a static class). It appears that the connection is already open. However, this does not happen when there is only one user using the application. What I cannot understand is that how do actions of one user affect the other in a web application?
I double checked that all my open connections are being closed after performing their operation by appending a line of text to a text file whenever a connection is opened or closed. The number of opened and closed connections was equal. Also, the connections are opened and closed from one place only, where the close method is inside a Finally() block.
How to insert data from local SQL server to remote SQL server (without using linked server) like below?
insert * into [remote server].[northwind].orders
from [local server].[northwind].orders
I have a site that is running on a Windows Server 2008 machine with IIS 7.0, when I try to open it with Visual Web Developer 2010, it says the following:
error: unable to open site: ... The Web server does not appear to have FrontPage Server Extensions installed.
Looking on the server Frontpage Extensions 2002 are installed, so what could be wrong?
The thing is, I used to be able to open the project and work on it, etc...
Open Website -> Remote Site -> Enter remote site name -> tries to open & error above!
I have to programmatically import a table from a database "A" in Sql Server 2000 to a database "B" in another server 2005.
View 1 RepliesThis issues has been driving me nuts. I am trying to follow the tutorial on [URL] I am trying to connect to a database in Microsoft SQL Server 2008. The way I do this is by right clicking on the "Data Connections" > Add Connection. Afterwards the Add Connection window comes up, I make sure my data source is "Microsoft SQL Server (SqlClient). And, I choose a server name; the only server I can choose is DomainSQLEXPRESS. The issue is when I go down to the "Select or enter a database name" drop down box, I do not see my database listed. I have also made sure in the SQL Server Management Studio that I have given my user all the privileges for the database. I know my explanation is kind of vague, but would anyone know the reason why I would not see my database?
View 3 RepliesI have SQL Server 2005 in my computer.I am using SQL Server 2005 for Development.
I can connect to my local & "COMPAQSQLEXPRESS" Server.
But while connecting to Remote Server i m getting the following error
TITLE: Connect to Server
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Cannot connect to x.x.xxx.xx.
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ADDITIONAL INFORMATION:
This version of Microsoft SQL Server Management Studio can only be used to connect to SQL Server 2000 and SQL Server 2005 servers. (ConnectionDlg)
------------------------------
BUTTONS:OK
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This is probably an easy one, but can I use SQL Server Management Studio Express to work on a regular SQL Server database?
View 2 RepliesI want to convert sql server 2000 database into sql server 2005 database. I am using sql server 2005 express.
I am trying by taking backup/Restore method, but it not work.