Please help - display contents of a database...

Hello All,

I am struggling to display the contents of a database to a "grid" on the device. I need to take all values in the database and display them to the device screen in an "excel" type page.

Here is what I have so far...

c

Code:

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conn4 = New SqlCeConnection("password = ''; Data Source = \program files\SmartDeviceProject6\MyDB.sdf")

        conn4.Open()

        'Select all records
        Dim cmd4 As New SqlCeCommand("SELECT * FROM MainDB", conn4)

        rdr2 = cmd4.ExecuteReader()

        DataGrid1.DataSource = "what do I use here to display contents?"

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Thanks all, Magohn

Hi
you can put it into a datatable, and use that as your source, or there is a sample in the same article that I just linked Waka to in an earlier question.
Take a look at this and see if it does what you need.

Hi petevick...

Thank you VERY MUCH!!!! That linked article was perfect. I cant believe I have spent hours trying to do what was accomplished with a simple 'drag n drop'. :)

Thank YOU !

Hi Pete (or anyone else),
First of all - thanks again - the linked doc was a huge help for me and my progress. I have a small follow-up question. The data now works perfectly on my device while in the application. I can add/edit and review all the data in the database on the device.
However, when I exit the application and then return back to the application my previously entered data is gone - its as if the database is reset on exit of the app. Any ideas?
Thanks, Magohn

have you got your database in the project to copy over to the device when you deploy?

That sounds like the problem, and you overwrite it every time you deploy your app

Quote:

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Originally Posted by petevick

have you got your database in the project to copy over to the device when you deploy?

That sounds like the problem, and you overwrite it every time you deploy your app

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Hi Pete,
Yes I have, the issue exists on the device also. I open the app and add data, close the app and then return to it -the data is gone!

I poked around a little and found this info on datagrids (what Im using) :

http://www.functionx.com/vcnet/datab...rydatagrid.htm

If you have used tables in SQL Server, Microsoft Access, Paradox, and other database environments, you probably know that their tables automatically save data as the user changes records and moves through cells. Although it is one of the most regularly used objects of databases in Microsoft Visual .NET, the DataGrid control doesn't inherently provide this functionality, but for a good reason. By default, the DataGrid control is not meant for databases only. When a DataGrid control displays data, it allows a user to enter new data but doesn't save it.

Data entered in a DataGrid is extremely easy to save. This is simply taken care of by calling the Update method of your data adapter.

So I guess all I have to do is figure out how to "update" the datagrid as the writers example is in C++ whereas I am using VB.

Thanks, Magohn

The article you looked at is for the full framework - not the compact framework. The original article explained inserting/updating.

Quote:

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Originally Posted by petevick

The article you looked at is for the full framework - not the compact framework. The original article explained inserting/updating.

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Hi Pete,

Though in the original article I see where it explains adding/editing items I do not see any reference to saving the database on exit from the application - am Imissing something? :confused:

Thanks, Magohn

Hi,
the method shown only adds data to the datatable as the tool doesn't generate the code.

After the .endit() do something like

ApplyUpdatesToDatabase()

and then

Code:

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Private Sub ApplyUpdatesToDatabase()
        Dim sourcedatatable As DataTable = (DirectCast(Me.CustomersBindingSource.Current, DataRowView)).DataView.Table
        Dim Customerdatatable As NorthwindDataSet.CustomersDataTable = DirectCast(sourcedatatable, NorthwindDataSet.CustomersDataTable)
        Dim ta As New NorthwindDataSetTableAdapters.CustomersTableAdapter
        ta.Update(Customerdatatable)


    End Sub

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That should do it