Question

Problem Updating a Database

Asked by: jokeefe1130

I am having a problem updating information to a MS Access Database.

Before i code this much more, i simply have a link to a MS Access Database, a DataGridView, a TextBox, and a Button on Form1.

The database is linked and when running the program it pulls the columns from the database and populates the DataViewGrid. This DataViewGrid will not allow changes, i want the changes to occur in textboxs and that information then updated back to the database.

i am able to make the DataGridView change with the updated information from Textbox1, however that information is not being written back to the actual database and i can't seem to figure out why..

The code below is my source code for all of Form1, and Button1_Click.

Public Class Form1
 
    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        'TODO: This line of code loads data into the 'CsvFileDS.CSVFILE' table. You can move, or remove it, as needed.
        Me.CSVFILETableAdapter.Fill(Me.CsvFileDS.CSVFILE)
 
    End Sub
 
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
 
        Dim TempTable As DataTable = CsvFileDS.Tables("CSVFILE")
        Dim NewEntry As DataRow = TempTable.NewRow
 
        NewEntry("DOS") = TextBox1.Text
 
        TempTable.Rows.Add(NewEntry)
 
    End Sub
End Class

                                  
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Asked On
2009-07-07 at 12:15:37ID24550773
Tags

VB 2008 EE

,

MS Access Database

,

Disconnected Mode

Topics

Visual Basic Programming

,

Databases Miscellaneous

,

VB Database Programming

Participating Experts
1
Points
500
Comments
5

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Answers

 

by: ArkPosted on 2009-07-08 at 15:39:14ID: 24809179

Me.CSVFILETableAdapter.Update(YourDataSetNameHere)

 

by: jokeefe1130Posted on 2009-07-08 at 18:46:50ID: 24810181

OK, that worked and i was able to update the information in the database, but now i have another problem... "NullReferenceException was unhandled", "Object reference not set to an instance of an object"

        Dim TempTable As DataTable = Database1DataSet.Tables("CsvFile")
        Dim NewEntry As DataRow = TempTable.NewRow '<--ERROR IS HERE
 
        NewEntry("DOS") = "2009-07-08"
        NewEntry("LOS") = "BLS"
        NewEntry("PTNAME") = "DOE, JOHN"
 
        TempTable.Rows.Add(NewEntry)
 
        CsvTableTableAdapter.Update(Database1DataSet.CsvTable)

                                              
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by: ArkPosted on 2009-07-08 at 19:13:17ID: 24810294

Try
Dim TempTable As DataTable = Database1DataSet.CSVFILE
I suggest using bindingsource instead of DataTables
'********Can be set in design time**********
dim bsCSVFILE As New BindingSource
bsCSVFILE.DataSource = Database1DataSet
bsCSVFILE.DataMember="CsvFile"
'*********************
       dim drv As DataRowView=bsCSVFILE..AddNew()
       drv("DOS") = "2009-07-08"
       drv("LOS") = "BLS"
       drv("PTNAME") = "DOE, JOHN"
bsCSVFILE.EndEdit
Me.CSVFILETableAdapter.Update(Database1DataSet.CsvTable)

 

by: jokeefe1130Posted on 2009-07-08 at 20:43:32ID: 24810609

Your Solution worked prefectly!

I will update the "Accept Solutions" shortly,

If you able to, i am also in need of a few other specifics with this same database.
1. Update an existing row/cell in the row
2. Delete the row

Your help is greatly appreciated, i havent worked with programming in many years and so much of the  syntax and funcations have changed. Last time i worked with programming, the database interface was "recordset..." VB '97
 
Thank you very much

 

by: ArkPosted on 2009-07-08 at 23:45:43ID: 24811158

Hi
The .net database approach is slightly different then old VB. Then main idea is:
1. Connect to database, get info (TableAdapter(s).Fill), disconnect
2. Working with dataset (like database mirror) - adding new records, modifying, deleting in memory
3. Finally - connect to database again, update changes (tableAdapter(s).Update), disconnect.
    3.1 Dataset.GetChanges gives changed records
    3.2 Dataset.AcceptChanges marks those records as unchanged to repeat 2-3 steps

So, if using BindingSourse(s):
1. Connect to DB (Fill adapters)
2. set bindingsource(s) DataSource(=DataSet) and DatatMember(s)(=TableName(s))
3. Work wit bindingsourse(s)
   3.1. Navigate: bs.Position=bs.Find("LOS","BLS")
   3.2 Add New (see my previous post)
   3.3 Change Cells: bs("PTNAME")="whatever", bs("otherColumn") = "newString"
   3.4 Delete bs.DeleteCurrent (or bs.Delete(bs(bs.Find("LOS","BLS")))
   3.4. Accept (bs.EndEdit)  or discard (bs.CancelEdit) in-memory changes
4. Update DataBase (TableAdapter.Update)

20120131-EE-VQP-002

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