I've updated my database...
And all the information goes in fine, and an Auto-Number is allocated.
Do I need to re-read the database to find & display this auto-number?
Where do I begin?
I have made an application where I connect a VB.NET program to a PLC. I read and write to/from PLC variables.I would like any read value to be updated real time in my VB.NET program. Is there a good way of doing that? For now I update a variable by a button click.
View 7 RepliesI'm trying to write my first application which connects to an Access db. It took me hours to understand this, but I figured out that, if during the creation of the connection I chose to copy the mdb file in my project directory (VB asks this), I get that the database is not updated. Everything works, except the save button which saves new rows in the db. If I answer no, and the original mdb file is used, the database is correctly updated as expected. Is there a reason for this? Why is this happening? Shouldn't the database bu updated anyway?
View 2 Repliesi implemented a RSS for big company on loacal area network attached with sql database to feed internal news.everything working fine.but i faced a small problem when the database changed the RSS doesn't take the update unless the user close the RSS and start it again.how can autorefresh the rss without closing it when the database changed.
View 1 RepliesUsing this code i cannot insert data in the database . it gives no error but no row is created in the data base
Imports System.Data.SqlClient Publi ClassForm1 SqlConnection("Data Source=.SQLEXPRESS;AttachDbFilename=
[code].....
Ive never done a database before and i found this in one of my books... I think it should work. The part of the program that is in bold is the issue i get an error that says "Update unable to find TableMapping['Table'] or DataTable 'Table'." From the da.Update(ds).. ive been trying to figure this out for hours!
Public Class retailForm
Dim tempPrice As Double
Dim dbProvider As String
[code].....
I have a datagridview bound to bindingsource. Whenever I delete a row, it is not updated to the underlying database table. I have to click elsewhere in the form to cause the dgv_rowValidated to fire where I have the following code in there to push changes to the database:
bs,EndEdit
Dim cb As New SqlCommandBuilder(myDataAdapter)
myDataAdapter.Update(myDataSet)
Normally, where do I place such code for updating when comes to deleting a row in datagridview? I noticed userDeletedRow event does not fired when I am deleting the last row in a one row datagridview.
The label never get updated when it is assigned a new value from DB. I try with label.refresh method and also update method but the label still never get updated.
View 2 Repliespart of my code is in below
[Code]...
I would expect to see the path.Path include the new record, however, I also notice that tempnextgen also include the new record. Can anyone help me out on this issue? Why the tempnextgen got updated as well, how to prevent this unexpected operation?
I have invoice form bound to a bindingsource and bindingnavigator. In the form I have unit price, quantity and total textboxes. The total textbox text property is set to total.text = quantity.text * unitprice.text in the textChanged event of both quantity and unitprice text boxes. The result is displayed in the total textbox. But when i hit save button on the bindingnavigator it is set to null and not saved to database. [code]When I used msgbox to see the value of total textbox before bindingsource.endEdit() it is the correct value. but after the code bindingsource.endEdit() it is null. I checked the databinding property and it is correct. What is the problem.
View 1 RepliesI've created a VB.NET Windows Form application which pulls info from an MSAccess database via datasets and tableadapter. When the user makes a change to the data, I use the Update method of the tableadapter to send the changes back to the database. This all works fine in the Visual Studio 2008 IDE, but once the build is done and the application is installed, I run into problems. The application keeps the original data and will not read or write to the database, although any changes I make through the application are mysteriously saved somewhere. If I make changes directly to the database using MS Access - which I need to be able to do - those changes don't show up in the data pulled into the application.
View 13 RepliesI can figure out how to do this, but Im not sure what I should be looking for. I have a database that gets updated about once a month, and when it does, it changes the name of the database file to match the date and time the new database was created.
The file name always starts with DB and the rest of the file name structure is DBYYYYMMDDHHMMSS (After the seconds, the file name is the same for all of the databases)
There are a few things I am trying to do.
1.I want to be able to search the update folder for whatever database is there
2.Trim the file name to return the database name as DBYYYYMMDD
3.Search the local database folder for the specific file name and return it in the same format as the update
4.Compare the two file names and choose which decide if one is newer than the other based on the date
What I need to know is what this would be called and what I would need to use to accomplish this.
how to get the updated database data and print into crystal report using VB.net?
Dim rpt As New CrystalReport1()
Dim myConnection As SqlConnection
Dim MyCommand As New SqlCommand()
[Code].....
VB2008 with MS Access Database updated related data ?
View 9 Repliescurrently i had a program which working fine when its running in the solution explorer,but after published,problem comes.my datagridview cant show updated data while my database access already update...my datagridview only show existed data.could it be my datagrid problem?i get my data programmatically or is my INSERT command doesn't update the dataset?but in the solution explorer does show the dataset was updated. [code]
View 3 RepliesI can edit the values in the dgv cells manually, add rows, delete rows all without problem and then update the database.My problem is in one form where I want to allow the user to filter the rows in the grid and then enter a value in a textbox and programmatically update all the cells in one column with that valueI can update the rows, and see the changes in the datagridview. When I try and update the database (using UpdateQuery on the underlying TableAdapter of the datagird) only some of thechanged rows are being updated I though it might be related
View 9 Repliesi am trying to read from access database and that work with data in a program. I used to work with VB from previous version and now it seems to me there are differencies. If someone can paste a working simple code.I would like to make a windows form aplication.
View 3 RepliesI am creating a drawing manager, to be run inside 64-bit AutoCAD. From what I have read, there is no 64-bit version of the msjet40.I thought was going to be successful was to build the class as a 32-bit, but I still get the error. is there a way that I can read an access database from withing a 64-bit app?
View 1 RepliesI read a decimal datum from my database and ask the debugger what I got:?
reader.Item(idxItem)
0D {Decimal}
Decimal: 0DI want to convert it to a string because I am building an output record.? CSTR(reader.Item(idxItem))
"0.0000"I don't want four decimal places so I try to be more specific:? STRING.format(reader.Item(idxItem), "0.00")
"0.0000" {String}
String: "0.0000"How do I get 0.00? And if my input is 90.5, I want 90.50.
I'm using Visual Studio 2008 and MS Access 2007.
I have linked the database to vs2008.
The first problem I have now is how to add all the data to the combobox from access 2007? [I have solved this myself accidentally.]
The second problem I have is I cannot save the primary key.
Assume that I have these:
Table name: tCustomer
Fields:
ID Datatype [Text]
[Code]....
Now, the user fills in the form. The ID cannot be edited by them where it's automatically counts the number of customer in database and give the id. For example, I already have 3 customers in the database so when I add new Customer, it will be 4 for the ID.
When I click save, it shows me the message of "Index or primary key cannot contain a Null value." I have set an input mask for my Customer. So, can I make it to save in a format like CT001, CT002, CT003 automatically?
i am a beginner level member of vs2008i had create a interface. In Daily Transec.vb form i cant insert, edit, delete, go prev and net data. already i had created a localdatabase as "Expense"need you help to complete itso this is request to u that plz chk the link file and complete the DailyTran.vb form. nothing else
View 2 Replieswhat the best way to do this?
View 2 RepliesI need to read rows from a database file (.wdb) to a datagrid. It's a cache file for world of warcraft or a database file for MS Works.
[URL]
I am trying out the Visual Studio 2008 Standard Edition Setup and Deployment - Setup Wizard on a very simple VB 2008 app which includes a simple SQL Express dB. The build works fine and it installs on the target system ok. But when I go to run the application and add a new record for example, I get a "read-only" error indicating that the sql db is read-only. Yet none of the files in the folder are read-only. What is odd is that the folder that it was installed into "acts" like it is read only, yet it is not identified as such. If I move the .exe and db files out of that folder, (onto the desktop for example) it works just fine. Should I set up a post build event or something to make
View 6 RepliesI'm trying to to connect to a Oracle database and read the content to a textbox. This is my
Dim conn As OdbcConnection
Dim connectionString As String
Try
[code]....
Connection is ok, (I think) Connection Open shows in textbox, and no errors. But I get a nullexeption on the reader, it has not been assign a value. Don't know what to do next.
i can't find any wrong, if record exists then updated the record but only can insert the new record.
cannot updated the record.why?
[Code]...
I am looking at Visual Basic 2008 Step By Step. I need to read a flat file and insert the records into my SQL database. My code so far:
[Code]...
The INPUT line needs to be fixed. From what I can see, I need to move it all to a single field and use a split to parse it, correct? As I look at the entries on this site, all the code seems to use stream readers. Why would the book not do that? Am I missing something?
Attached are my source files i found a source and messed about with it, itsa chat client and a server which listens to clients anyway the server sends out all the messages to each client, all i want to be able todo is have a little box in my client, which is there, but has no function, its meant to list all the users currently connected.
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I have the following records in the table student(see in fig 1). I am trying to update the Name of student whose Roll no =1. But Record is not updated in the database,
I have code similar to the code below that works in other parts of my program. The reason the code below does not work is because the datatable is made up of data from two separate tables. Does anyone know how to make this work for multiple tables? Can I choose what fields to send back and where to send them? This is what fills my datagridview and it works fine.
[Code]....
