Allow Database Table Updates From Multiple Programs?
May 17, 2011
Since ADO.Net uses a 'disconnected' model where the data available to a single program is just a copy of what is in the database, what is the normal way to handle multiple programs needing to update the same table in a database? The problem I see is that a program can't update unless his copy of the data is the most up-to-date. Are we supposed to read before updating and hope that the update occurs before someone else changes the data?
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May 31, 2010
I'm using a SQL database and I'm writing a VB.NET client application. This application is used on multiple computers at the same time. If one of the clients makes an update to the database I would like to have the other clients to be aware of the update.
Has ony one already done this before?
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Oct 20, 2009
I know that all installed programs and updates can be found at HKEY_LOCAL_MACHINESOFTWAREMicrosoftWindowsCurrentVersionUninstall key in the registry.
But how can I differentiate between installed programs and installed updates?
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Jul 9, 2009
I have a program that uses sql for the database. The issue im having is when two users attempt to update the same record then the update from second user overwrites the record from the first user. I believe this problem comes from the the way i attempt to preserve existing text in the fields.
My thought on whats going on is: If the form has fields A and B. Both users start with a blank form. User 1 adds a record with an entry in field A. When user 2 goes to update the record with an entry in form B, the program overwrites user 1s field A entry with the blank field A from user 2.
Is there a way to force it to grab the most recent data before it tries to add/update? I thought about resetting the digit combo box to the same digit which would trigger the change event for that field. but the issue with that is it would also wipe out the current entries on the form.
Below is the change event for the digit combobox, the main submit procedure, and the subprocedure for one of the days.
[code]
Private Sub cboDigit_SelectedIndexChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles cboDigit.SelectedIndexChanged, cboOffice.SelectedIndexChanged, dtEndDate.ValueChanged, dtStartDate.ValueChanged
[Code].....
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May 9, 2009
In grid there r checkboxes for selecting the records to be updated as soon as checkbox is checked textboxes changes to edit mode. when data is modified and update button is clicked updation should be done to the database.But when update button is clicked its not working.when i checked through breakpoints i m not getting the value for the variable strID.
Protected Sub btnupdate_Click( ByVal sender As Object , ByVal e As System.EventArgs) Handles btnupdate.Click
Dim strSql As New StringBuilder( String .Empty)
Dim cmdup As New SqlCommand
For i As Integer = 0 To GridView1.Rows.Count - 1
[code].....
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Sep 11, 2010
it is possible to do a multiple records editing by linqtosql method in one click event?What I've been trying to do is to edit all the names in the table which are having the same account number.
Private Sub Button2_Click(------------) Handles Button2.Click
Dim accnt As String
accnt = Textbox1.Text
Dim db As New memrecDataContext()
[code]....
Why is it these codes could only edit records in one datarow?Can you debug the codes to edit all records which are having the same account number after it is being query?
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Nov 28, 2010
I am using vb .net as front-end and sql server management studio express as back-end. This is my very first project in vb .net
I want to use one datagridview to retrieve data from multiple table.
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Oct 19, 2009
I would like to ask if it is possible to do a multiple records editing by linqtosql method in one click event? What I've been trying to do is to edit all the names in the table which are having the same account number. I was able to edit but only one name has been edited and the rest are not
******************************************************
Private Sub Button2_Click(------------) Handles Button2.Click
Dim accnt As String
accnt = Textbox1.Text
[Code]....
Why is it these codes could only edit records in one datarow? Can you debug the codes to edit all records which are having the same account number after it is being query?if that is possible for you.
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Aug 9, 2011
I am trying to append multiple rows in a SQL Server.I have connected to the MS SQL Server and with a DataAdapter, I have downloaded the Table into a DataTable and displayed it in DataGridView.I now want to programatically enter multiple rows into the DataTable and later to update the SQL Table.
I am trying to build an application to do this generically.The problem I have is that the Table and DataTable has an 'ID' Field. In the SQL DB, i is an Auto-incrementing field.When the code loops through creating new rows and entering field values, how do I handle the ID Field that is the Primary Key?
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Jun 18, 2009
I have to compare an item value in two tables. these two tables are on different database(same server).
I have succesfully generated sql query to return both table values.
the query runs in sql server without any problem and gives the results.
The same query i used in vb.net doesnt gives any result ...
It is resulting with no rows.
Does the connection to multiple databases wont work from vb.net.
The following classes are used to get the result ...
SqlConnection
SqlCommand
SqlDataAdapter
SqlDataAdapter is showing with no records returned. The same query returns the results in sql server query window...
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Jan 25, 2012
I have a data table that I am updating. The table has 5 rows.The first row in the data table that has an ID of 1 will not update with new values, but the rest of the data table does update, I can't figure out why.
It is an access database I am updating, Is there a problem with my Update String? Because it updates all of my table except for the first row that has an ID of 1.
Dim sqlSSRTotalUpdateParameters As String = "UPDATE [SSRTotalChecker_" & FullName & "] SET [Totals]=@Totals,[Category]=@Category,[Materials]=@Materials, [Labour - Field Effort]=@LabourFE," & _
" [Labour - PMO]=@LabourPMO, [Labour - Supervision]=@LabourSuperv, [Labour - Administration]=@LabourAdmin," & _
[code]....
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May 11, 2011
I'm looking for a way to combine a field from multiple tables into a single field in a new table. Because the data populating the tables is coming from an outside source, I would prefer not to change the data in the original files. I have a separate table for each year because this is the way the data is provided. The field layout is not consistent from year to year, but each year there is a field that we'll call "score." I'd like to pull the field "score" from each year's table and have it populate a "score" column in a new table along with the year of the data so that all the years' scores are in the same place. Is there a way to do this using Visual Basic + Access?
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Dec 7, 2010
i apologize if this isnt up to your developer lingo, i really do lack proper developer/English skills)Just for starters this request is 100% genuine...im not some student trying to get you guys to finish my project, this is purely for educational and personal information for myself.Scenario: (brief)(i am using Visual Studio 2010)I am wanting to build a project that generates a printable purchase orders report and retreieves and save the entered details to a access Database (MDB).
In the purchase order application im trying to develop i want a user to be able to select existing clients from n table in the access DB. in which will then fill a portion of the CLIENT detail section in the application. i want to then be able to uses these client details to create a unquie purchase order ID containing all client details aswell as the purchase order list for that client this such as products and labor or whatever is inputted in the fields. (I have attached a screen shot of a brief example of the form layout, might give you more idea. - screen shot made in VISIO)
[Code]...
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Jan 12, 2012
I currently have one VB 2010 express program that runs on my machine,It tracks machine run-times so I can't shut it down. The problem is now I have a new project to write and when I go to debug it, the currently running program pops up and I cannot debug the new project. Is there something I am doing wrong, or does the VB express environment prevent more than one instance of the runtimes from running?
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Jun 7, 2012
I am trying to understand how the binding navigator buttons are actually working.
I started by creating a table called "Students" in MS Access,
I then "dragged and dropped" that table onto my VB form after importing the data connection.
When I debug, I click the add new (the yellow plus "+") then I type info into my fields (700_Number, First_Name, MI, Last_Name). (700_Number=Primary Key)
After I am finished typing into the four text boxes, I click save. If I end my program then start the debugger again, the record is still there...it goes away only if I change some of the code anywhere in my program.
Also, I am trying to use the record I just put into my database for another part of my program. I use this line of code:
MsgBox(frmAddStudent.DrByrdsTaskListAppDBDataSet.Tables("Students").Rows(0))
This is just to see if what I am trying to put into my database is actually making it there. Every time I run, this message box turns up blank.
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Nov 24, 2009
I am trying to create a form which will be fed by an underlying database to create multiple form fields for each entry in an underlying database table. This is for a program to monitor patients under anesthesia, and prior to surgery, the doctor will choose which monitors they will be using. Then, on the actual monitor screen which will pop up every X minutes, there will be a text box and a check box for each chosen monitor. I am relatively new to VB, so I have tried to illustrate what I am needing but using the logic that I know from my previous life in PHP.
I am using DevExpress's layout control to place the form fields, so that is the code in the middle of the first loop (on_load), and I know that part works, I just need to know how to name the fields and then recover those fields and commit the values to the database. (the text boxes are added to the database, the check boxes are used to determine if an entry is made for that monitor- i.e. at the end of surgery if a monitor is turned off). I know that my syntax for naming the fields is no where close to correct, and it probably would not work in PHP, but I remember doing something like this in a PHP application I built long ago. [Code]
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Dec 15, 2011
I got the printing. Now how can I allow users to update the database, such as Add, Change, or Delete records accordingly? Then I am finished with my project.
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Aug 26, 2011
how to check if a field( a cell within a database for talk sake date of birth) has been edited in the past then flag it now this field may not be change for a year but how do i keep a record of that and the flag it if it is change.
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Apr 21, 2008
I want to move my programs and the database to another computer and hard-disks. It looks to me as though I nearly have to re-create the controls and rewrite some of the code to make it so the programs still work after the move. At least with ODBC all I would change was the DSN definitions external to the programs. Is there an easy way to move or rename a database without loads of work?
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Oct 2, 2010
In the past few weeks, to speed up our database freshening process, I've created a couple of extra programs, basically copies of the exe file. The program itself, accesses web pages, images etc and uses threads to do so. The second program uses LIMIT 300,100 and the third LIMIT 600,100, to make sure they don't work on the same records.
Before the last few weeks, one occurrence of the program used to run without problem, from the task scheduler all through the day. Only one occurrence of each exe can run at a time.Since theres now three programs running, .net 2.0, on xp, the program often seems to get stuck and never ends. I have to kill it from task manager.
It runs fine in the IDE I just wonder if there would be any benefit from upgrading to vb.net 2010 ?
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Jul 16, 2011
I have a program that, at present, reads a set of global variables from a text file. The program is on the client machines (around 100 clients). My problem is that when it comes to the update of the variables within the client program an error sometimes appears stating that the text file could not be read as it is already open (by one of the other machines). Currently I am cutting it down so that only 30 machines read from the single text file, although I am still going to get the error occasionally. Any ideas (apart from catching the error, and trying to read again until it works). Maybe another way to store the variables?
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Jul 27, 2009
I'm planning to make multiple projects, which could connect (or comminicate) together. It's like a designing Network Program. There'll be a main program and some sub programs. These sub programs will send the informations about other computers which is on my network to the main program. If you ask "Why do you need to get infos about other computers?" ,then let me explain. I'm using limited internet connection and I'm not the only one who's using this wireless network. If I get over the limit, I'm paying some limit-upper fee. So, I've to control others internet usage to not to get over the limit. I've just made a small download counter program for my pc, but as I said, I want to convert it to a bigger project, with network solution. Could anyone refer me any resource, or show me any starting point?
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Apr 15, 2008
I have one specific problem, that is relative to DataTable Updates to Database.
Code:
auxDatatable = Mydataset.MyDatatable.GetChanges
Now i'm going to Accept or Reject Changes based on some Criteria. The problem is that I wish to Update Only the Records that in Fact exist on the Database, as you can imagine I was forced to create some Dummy Records in Datatable, to a specific job.
My approach to this issue was to do something like this :
Code:
Private Sub MySub (ByVal auxDatatable As DataTable)
Dim drView As Mydataset.Mydatatable
For i As Integer = 0 To auxDatatable.Rows.Count - 1
[CODE]...
As you can see I tried to Delete the rows that are Dummys, but the rows in fact are not being deleted. As consequence I get an error after that Sub, when i try to make :
Code:
MyTableAdapter.Update(auxDatatable)
This is naturaly caused by the dummy Records.
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Mar 11, 2010
I'm using mysql database..I have forms setup main form has datagrid..you can add to this datagrid and save to datbase with my add form and it works fine. I can delete from the datagrid and it works fine...when I select an account to edit is when I have my issue...form edit brings up the selected account but when I save my changes it doesn't save to the selected account it changes my first account in the database......
Here is a sample of my code
Private Sub btnSave_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnSave.Click
' 'Save changes to database and exit
Dim intResponse As String
intResponse = MsgBox("Do you want to SAVE Changes to this record?", vbOKCancel, "Save?")
If intResponse = vbOK Then
[CODE]...
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Apr 12, 2011
I have a form in my application that presents users with a datagridview which pulls data from database-a. I then offer the users the ability to edit that data but what I'd like to do is when they click the save event, that it saves their changes to database-b.
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Apr 13, 2011
Ive only recently starting fiddling with Visual Basic Express and Sql Databases. Ive managed to get a database up and running, and can query information from it. I have even created a form that can add a new entry to the table im using.The first form has a ComboBox that list the PlayerNames in my table. Form2 allows you to add a new name to the table, but anything I add isnt immediately updated in Form1. I have to relaunch the program to see the new entries. Even then, these new entries dont seem to be permanent as they eventually dissappear.The code I have for Form1:
Public Class Form1
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
.................0......................................................
00
[code]....
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Oct 1, 2010
what's the best way to handle the updates to the database.For example i have one datagridview that's binded to a datatable (with two fields, id auto incremented and a varchar). The user can do all the operations Insert, Update, Delete.If i insert one row (only the text) and call the update method to save the changes to the database, and after that remove the same row and call the update method the adapter will throw a exception because it didn't update the datatable with the value of the id. So the best way to do this is always calling the fill method after every update?
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Jan 22, 2011
[Code] my issue is that now i need two cases, first i need a query that will return the date created and modified of the table and i also need to know if its possible to query a list of table names in the database ordered by date created but that have a certain thing in their names. for example the database contains the following tables: [Code] and what i need the query to return is the tables that contain "Data", settings and employees are for the other functions of the program. so the query should return the 4 data tables in order of date created. but i have no idea how to go about doing that in the query, does anyone know how this is done?
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Nov 16, 2011
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
[code]......
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Oct 22, 2010
how to implement UI, BL and DAL in a project the way that I see it as a requirement for some projects. The way I am able to do a project now is from a form create an object of a class in which there are properties and functions that do database selects, updates and deletes. Looks to me that doing a project like that is separating the UI from the DAL. In an update button click event I may call Obj. Delete (txtCustID.txt) for example. I don't understand the part of further breaking it down to include a Business layer; in which a vb solution is made up of three solutions.What goes in the BL?Does the BL call the DAL?
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