The Update() Of An Application Doesn't Perform Any Updates Or Deals With Concurrency?
Nov 10, 2009
I have written an application to perform a simple CRUD operation i've used MVC design pattern... DAL was designed using the wizard. I was able preserve the olds value of teh fields of EMployee class using a seperatemethod
PreserveOldValues(){ //code}
in the SearchByIndex() i call the fill method and i used the data to initialize the current Employee object also i preserve those values using PreserveOldValues() the i call update() and internall i pass the preserved values......However it doesnt do concurrencies and updates..
I've got a question below:load data from a table in database into a datagridview,make change in datagridview,and use update function to update change back to tablebut 13 changes, only 12 being update back to databaseonly the top row on the datagridview not being update??
For Each orow As DataGridViewRow In DataGridView1.Rows orow.Cells(1).Value = TextBox1.Text Next
Tried searching and found some related issues but none exactly like I was having I iterate thorugh a DGV and write to one of the fields of the row. After it writes this field, I do an update() command.
I'm trying to update a row via c# winform application. The update query generated from the application is formatted correctly. I tested it in the sql server environment, it worked well. When i run it from the application i get 0 rows updated.Here is the snippet that generates the update statement using reflection - don't try to figure it out. Carry on reading after the code portion:
public void Update(int cusID) { SqlCommand objSqlCommand = new SqlCommand(); Customer cust = new Customer();
[code]....
The above final update statement works on the sql environment, but when running via the application, the execute non query runs ok and gets 0 rows updated!
We got an old system here in .NET 4.0 using an Oracle DB. At some point, some calculus are made and the system "locks" that register in the table using the following command: "SELECT [the registry that will be update by the calculus] FOR UPDATE NOWAIT". So if anyone tries to calculate or update the registry with that ID it won't work. After calculating, the system connects to the DB again and then "releases" the registry by simply executing a Rollback command.
Theoretically, this is correct for the system(although I don't like it). Anyway, here is the thing: if something is being calculated(and these calculous take like 5 minutes to finish) and in the middle of the calculous I close the browser, the registry will still be "locked", only being unlocked when IIS restarts(actually I dunno if it's released first, I forced IIS restart 'cause it was taking too long). [Code]
get around the following problem please?I have an Access database which can be accessed by more than one instance of my application (which is) a Form with a DataGridView on it.I populate the DGV with
Form1.Validate()Form1.CHECKLISTBindingSource.EndEdit()Form1.CHECKLISTTableAdapter.Update(Form1.chkDataSet.CHECKLIST) The Access Database can then be updated via the DGV by a button click (which runs the code above (to copy across the latest copy of the DB) and then runs the code below to copy your changes to the DB)
Okay have developed a form in vb.net cf using sqlce. I know this is the vb.net section but I feel it's a data issue. I have a table called STORES which has a primary key of two columns (ST_STORECODE & ST_CY_CODE).I populate a dataset with all the store data and to the following to find the required row:-
[Code]...
When I step over the update command I get a concurrency error. Can someone PLEASE help me with this. I have spend days trying to fix it. All I want to do is find a row, do some changes and save it back to the database.
A concurrency violation error? It happens on this statement:
CODE:
It thinks I'm using a key value of 1 when the actual value is really 1218. I'm using a command builder. The attachments show the value of the key value and the value of the update text values. By the way, I can insert data but not update it.
I am using the select command to find a specific row and if its found update it but when I update back to live database I get a concurrency error. Here is my
Alright, when I open my program I want it to check for updates and if there is an update I want it to download. So far I have a text file saying the most recent version and then it downloads that file and compares it to the current file version. If the current file version < recent version then it will download the file. :O Can someone help me with the code? :3 I have a hosting server with direct download links.
I got the database to update, but it only does it for the first row selected not for the others.
Protected Sub btnUpdate_Click(ByVal sender As Object, ByVal e As EventArgs) For Each row As GridViewRow In GridView6.Rows ' Selects the text from the TextBox Dim selectedcheck As CheckBox = CType(row.FindControl("chkselect"), CheckBox) If selectedcheck.Checked = True Then
Before performing an update, the application must search for that record in the database. Once it's found then it return to the Data access layer. Typicaly when i return rows i return them in a dataset. The i send it to the client to load on to the ListView Constrol or to textbooxes. therefore data was sent from the dataset object, therefore onces the user has made updates to the data, first i must update the dataset.
In the Data access layer i can write method that contains the command object for update DB and bind it with the current Dataset so that each time dataset updates it sychrinizes DB with it. Assume i have a method called update() in teh business layer that calls the updateDB in the DataAccess Layer, how can i call the Update() of the business layer each time the user updates the dataset?
Target machine 4 core AMD I have an event that is raised my the main thread of the application. The event is consumed by several different classes in the application. I want them all to run concurrently up to the max cores available and then que the rest in order.The work routine in each class is relatively small but concurrency is the goal.Considering this.
A. Create a background worker on each classes initialization and have the event handler start the worker.
B. Create a delegate to the do-work sub that is called by the event handler
A- Pros - worker is only created once and reusable so only pay creation cost once.
A-Cons could create a ton of workers that consume resources eventually.
give me some example code to insert rows of datagridview into a sql express database table? Also, how do I manage concurrency as it is a multi user application?
the problem here happends every time i tried to change a record that's been allready saved.Private Sub PropuestasBindingNavigatorSaveItem_Click_1(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles PropuestasBindingNavigatorSaveItem.Click
update [approvers] set approvalstatus = True Where approvalstatus = False and bookingID = @bookingid and approveremail = @email
Using the entity framework.
I have my query which should deliver the item like so:
Dim db As New Model.Entities Dim approvers = From a In db.approvers Where a.ApprovalStatus = False And a.BookingID = BookingID And a.ApproverEmail = UserName Select a.ApprovalStatus
How do I next target this record for update, so that I can set a.approvalStatus = True then commit these changes to the db?
I am using an update panel and when I click a button it will update all the panels. updapanel1.update() is very simple, but my data is not updating unless I hit the button twice. My gridviews shows data for a selected user, and then all the grids reflect that users data. works fine all the update panels work for the gridviews. Now for somereason when i try to do a row count and update the panel with the summary, it does not work, i get either the previous users summary or if i hit update again for the same user i get the correct data.
I have a gridview that is set to a sql datasource, it is generating the columns automatically. If I add a column to the table it is referencing, it will draw that column and display it, but it does not update the insert/update commands to include the new column. Is there any way have it rebuild those commands automatically?
currently i am working on a project in which i am using datagridview control. if I enter key value in cell than remaining data of that particular row fetch automatically from data base. how? how to delete as row in datagridview? how to update a row in datagridview?
Public Sub UpdateStaff(ByVal sr As StaffRecord) Dim oldSr As StaffRecord Dim q = From staff In db.StaffRecords Where staff.Employee_Number = sr.Employee_Number Select staff oldSr = q.First oldSr.Address_Line1 = sr.Address_Line1
[Code]...
The helper function I have written seems to do everything I want apart from update the db. Stepping through the code, the oldSr is updated by the new sr parameter but no update on submit changes.
I'm still a noobie whe it comes to VB.NET but I am going to be specifically orking/interacting with websites such as passing variables to textboxes, clicking on buttons, etc.
I'm using the Application Updates option in Visual Studio with 'Before the Application Starts' checked.Users are complaining of canceling the update and then finding out they really want the update. When they decide they want to update there is no way for them to update the application until I publish a new version, because once they cancel the dialog box it never shows up again.
Is there a way to create a menu option to force a check for updates?
Kind of off-topic... Are there any open source Application Update programs for .NET?
This application should ask the user for a percentage amount by which each price should be increased then increase each price by that amount and then display the increased amounts. I can't seem to get it to calculate the amounts. Everything else seems fine. Any suggestions, ideas or recommendations? [Code]
