fails trying to update:'System.InvalidOperationException'

B

Barret Bonden

I get

"An unhandled exception of type 'System.InvalidOperationException' occurred
in system.data.dll
Additional information: Update unable to find TableMapping['Table'] or
DataTable 'Table'."

in da.Update(ds) , the last line of code in the listing below, as I'm trying
to write back to the database.....



Imports System

Imports System.Data

Imports System.Data.OleDb

Public Class Form1

Inherits System.Windows.Forms.Form

Private recordsread As Long

Private strconnect As String

Private mytable As String

Private mydataset As DataSet

Public ds As New DataSet

Public ot As DataTable

Public mytab As String '2nd way

Public da As OleDb.OleDbDataAdapter

' Public objconn As OleDb.OleDbDataAdapter

' Dim objConn As New OleDb.OleDbConnection(con)





#Region " Windows Form Designer generated code "

Public Sub New()

MyBase.New()

'This call is required by the Windows Form Designer.

InitializeComponent()

'Add any initialization after the InitializeComponent() call

End Sub

'Form overrides dispose to clean up the component list.

Protected Overloads Overrides Sub Dispose(ByVal disposing As Boolean)

If disposing Then

If Not (components Is Nothing) Then

components.Dispose()

End If

End If

MyBase.Dispose(disposing)

End Sub

'Required by the Windows Form Designer

Private components As System.ComponentModel.IContainer

'NOTE: The following procedure is required by the Windows Form Designer

'It can be modified using the Windows Form Designer.

'Do not modify it using the code editor.

Friend WithEvents TextBox1 As System.Windows.Forms.TextBox

Friend WithEvents btnnext As System.Windows.Forms.Button

Friend WithEvents Button1 As System.Windows.Forms.Button

Friend WithEvents TextBox2 As System.Windows.Forms.TextBox

Friend WithEvents Button2 As System.Windows.Forms.Button

Friend WithEvents Button3 As System.Windows.Forms.Button

<System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()

Me.TextBox1 = New System.Windows.Forms.TextBox

Me.btnnext = New System.Windows.Forms.Button

Me.Button1 = New System.Windows.Forms.Button

Me.TextBox2 = New System.Windows.Forms.TextBox

Me.Button2 = New System.Windows.Forms.Button

Me.Button3 = New System.Windows.Forms.Button

Me.SuspendLayout()

'

'TextBox1

'

Me.TextBox1.Location = New System.Drawing.Point(72, 88)

Me.TextBox1.Name = "TextBox1"

Me.TextBox1.Size = New System.Drawing.Size(128, 20)

Me.TextBox1.TabIndex = 0

Me.TextBox1.Text = "TextBox1"

'

'btnnext

'

Me.btnnext.Location = New System.Drawing.Point(32, 168)

Me.btnnext.Name = "btnnext"

Me.btnnext.Size = New System.Drawing.Size(56, 24)

Me.btnnext.TabIndex = 1

Me.btnnext.Text = "next"

'

'Button1

'

Me.Button1.Location = New System.Drawing.Point(176, 160)

Me.Button1.Name = "Button1"

Me.Button1.Size = New System.Drawing.Size(48, 32)

Me.Button1.TabIndex = 2

Me.Button1.Text = "load "

'

'TextBox2

'

Me.TextBox2.Location = New System.Drawing.Point(72, 120)

Me.TextBox2.Name = "TextBox2"

Me.TextBox2.Size = New System.Drawing.Size(128, 20)

Me.TextBox2.TabIndex = 3

Me.TextBox2.Text = "TextBox2"

'

'Button2

'

Me.Button2.Location = New System.Drawing.Point(32, 208)

Me.Button2.Name = "Button2"

Me.Button2.Size = New System.Drawing.Size(56, 24)

Me.Button2.TabIndex = 4

Me.Button2.Text = "prior"

'

'Button3

'

Me.Button3.Location = New System.Drawing.Point(176, 208)

Me.Button3.Name = "Button3"

Me.Button3.Size = New System.Drawing.Size(48, 24)

Me.Button3.TabIndex = 5

Me.Button3.Text = "save "

'

'Form1

'

Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13)

Me.ClientSize = New System.Drawing.Size(292, 266)

Me.Controls.Add(Me.Button3)

Me.Controls.Add(Me.Button2)

Me.Controls.Add(Me.TextBox2)

Me.Controls.Add(Me.Button1)

Me.Controls.Add(Me.btnnext)

Me.Controls.Add(Me.TextBox1)

Me.Name = "Form1"

Me.Text = "Form1"

Me.ResumeLayout(False)

End Sub

#End Region


Private Sub btnnext_Click(ByVal sender As System.Object, ByVal e As
System.EventArgs) Handles btnnext.Click

Me.BindingContext(ds, mytab).Position += 1

End Sub

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As
System.EventArgs) Handles Button1.Click

Dim con As String = "Provider=Microsoft.Jet.OLEDB.4.0; Data Source=F:\old
d\splash\SPLASH.MDB;Persist Security Info=False "

Dim sSQL As String

sSQL = "select * from company"

Dim objConn As New OleDb.OleDbConnection(con)

' objconn = New OleDb.OleDbConnection(con)

mytab = "company" '2nd way

' Dim da As New OleDb.OleDbDataAdapter(sSQL, con)

da = New OleDb.OleDbDataAdapter(sSQL, con)

' Dim ds As New DataSet("test")

' Dim ds As New DataSet

Dim dv As DataView

Try

objConn.Open()

Catch myexception As System.Exception

Windows.Forms.MessageBox.Show(myexception.Message)

End Try



If objConn.State = ConnectionState.Open Then

Try



' da.Fill(ds, "company")

da.Fill(ds, mytab)

objConn.Close()

' Dim ot As DataTable

ot = ds.Tables("company")

'dim dr as DataRow = ot.Rows.

'Dim dc As DataColumn

Dim s1 As Single

s1 = ot.Rows.Count

Dim dr As DataRow

For Each dr In ds.Tables("company").Rows

' TextBox3.Text = dr("company")

' ComboBox1.Items.Add(dr("company"))

Console.WriteLine(dr("company"))

Next

s1 = ot.Columns.Count

' TextBox2.Text = s1

dv = ot.DefaultView

setcontbind()



TextBox1.DataBindings.Add("text", dv, "company")

Catch myexception As System.Exception

Windows.Forms.MessageBox.Show(myexception.Message)

End Try

End If

End Sub

Private Sub setcontbind()

TextBox2.DataBindings.Add("text", ds, "company.company")

End Sub

Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As
System.EventArgs) Handles Button2.Click

Me.BindingContext(ds, mytab).Position -= 1

End Sub

Private Sub Button3_Click(ByVal sender As System.Object, ByVal e As
System.EventArgs) Handles Button3.Click

da.Update(ds)


End Sub

End Class
 
E

Elton Wang

Hi Barret,

Before executing da.Update command, you should have
INSERT, UPDATE, or DELETE statements for the da. If
INSERT, UPDATE, or DELETE statements have not been
specified, the Update method generates an exception.
However, you can create a SqlCommandBuilder or
OleDbCommandBuilder object to automatically generate SQL
statements for single-table updates.

For example

da = New OleDb.OleDbDataAdapter(sSQL, con)
' without following line code da.Update will generate an
exception
Dim custCB As OleDbCommandBuilder = New OleDbCommandBuilder
(da)
da.Fill(ds, mytab)

....

da.Update(ds,mytab)

HTH

Elton Wang
-----Original Message-----
I get

"An unhandled exception of
Click to expand...
type 'System.InvalidOperationException' occurred
in system.data.dll
Additional information: Update unable to find TableMapping ['Table'] or
DataTable 'Table'."

in da.Update(ds) , the last line of code in the listing below, as I'm trying
to write back to the database.....



Imports System

Imports System.Data

Imports System.Data.OleDb

Public Class Form1

Inherits System.Windows.Forms.Form

Private recordsread As Long

Private strconnect As String

Private mytable As String

Private mydataset As DataSet

Public ds As New DataSet

Public ot As DataTable

Public mytab As String '2nd way

Public da As OleDb.OleDbDataAdapter

' Public objconn As OleDb.OleDbDataAdapter

' Dim objConn As New OleDb.OleDbConnection(con)





#Region " Windows Form Designer generated code "

Public Sub New()

MyBase.New()

'This call is required by the Windows Form Designer.

InitializeComponent()

'Add any initialization after the InitializeComponent() call

End Sub

'Form overrides dispose to clean up the component list.

Protected Overloads Overrides Sub Dispose(ByVal disposing As Boolean)

If disposing Then

If Not (components Is Nothing) Then

components.Dispose()

End If

End If

MyBase.Dispose(disposing)

End Sub

'Required by the Windows Form Designer

Private components As System.ComponentModel.IContainer

'NOTE: The following procedure is required by the Windows Form Designer

'It can be modified using the Windows Form Designer.

'Do not modify it using the code editor.

Friend WithEvents TextBox1 As System.Windows.Forms.TextBox

Friend WithEvents btnnext As System.Windows.Forms.Button

Friend WithEvents Button1 As System.Windows.Forms.Button

Friend WithEvents TextBox2 As System.Windows.Forms.TextBox

Friend WithEvents Button2 As System.Windows.Forms.Button

Friend WithEvents Button3 As System.Windows.Forms.Button

<System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()

Me.TextBox1 = New System.Windows.Forms.TextBox

Me.btnnext = New System.Windows.Forms.Button

Me.Button1 = New System.Windows.Forms.Button

Me.TextBox2 = New System.Windows.Forms.TextBox

Me.Button2 = New System.Windows.Forms.Button

Me.Button3 = New System.Windows.Forms.Button

Me.SuspendLayout()

'

'TextBox1

'

Me.TextBox1.Location = New System.Drawing.Point(72, 88)

Me.TextBox1.Name = "TextBox1"

Me.TextBox1.Size = New System.Drawing.Size(128, 20)

Me.TextBox1.TabIndex = 0

Me.TextBox1.Text = "TextBox1"

'

'btnnext

'

Me.btnnext.Location = New System.Drawing.Point(32, 168)

Me.btnnext.Name = "btnnext"

Me.btnnext.Size = New System.Drawing.Size(56, 24)

Me.btnnext.TabIndex = 1

Me.btnnext.Text = "next"

'

'Button1

'

Me.Button1.Location = New System.Drawing.Point(176, 160)

Me.Button1.Name = "Button1"

Me.Button1.Size = New System.Drawing.Size(48, 32)

Me.Button1.TabIndex = 2

Me.Button1.Text = "load "

'

'TextBox2

'

Me.TextBox2.Location = New System.Drawing.Point(72, 120)

Me.TextBox2.Name = "TextBox2"

Me.TextBox2.Size = New System.Drawing.Size(128, 20)

Me.TextBox2.TabIndex = 3

Me.TextBox2.Text = "TextBox2"

'

'Button2

'

Me.Button2.Location = New System.Drawing.Point(32, 208)

Me.Button2.Name = "Button2"

Me.Button2.Size = New System.Drawing.Size(56, 24)

Me.Button2.TabIndex = 4

Me.Button2.Text = "prior"

'

'Button3

'

Me.Button3.Location = New System.Drawing.Point(176, 208)

Me.Button3.Name = "Button3"

Me.Button3.Size = New System.Drawing.Size(48, 24)

Me.Button3.TabIndex = 5

Me.Button3.Text = "save "

'

'Form1

'

Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13)

Me.ClientSize = New System.Drawing.Size(292, 266)

Me.Controls.Add(Me.Button3)

Me.Controls.Add(Me.Button2)

Me.Controls.Add(Me.TextBox2)

Me.Controls.Add(Me.Button1)

Me.Controls.Add(Me.btnnext)

Me.Controls.Add(Me.TextBox1)

Me.Name = "Form1"

Me.Text = "Form1"

Me.ResumeLayout(False)

End Sub

#End Region


Private Sub btnnext_Click(ByVal sender As System.Object, ByVal e As
System.EventArgs) Handles btnnext.Click

Me.BindingContext(ds, mytab).Position += 1

End Sub

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As
System.EventArgs) Handles Button1.Click

Dim con As String = "Provider=Microsoft.Jet.OLEDB.4.0; Data Source=F:\old
d\splash\SPLASH.MDB;Persist Security Info=False "

Dim sSQL As String

sSQL = "select * from company"

Dim objConn As New OleDb.OleDbConnection(con)

' objconn = New OleDb.OleDbConnection(con)

mytab = "company" '2nd way

' Dim da As New OleDb.OleDbDataAdapter(sSQL, con)

da = New OleDb.OleDbDataAdapter(sSQL, con)

' Dim ds As New DataSet("test")

' Dim ds As New DataSet

Dim dv As DataView

Try

objConn.Open()

Catch myexception As System.Exception

Windows.Forms.MessageBox.Show(myexception.Message)

End Try



If objConn.State = ConnectionState.Open Then

Try



' da.Fill(ds, "company")

da.Fill(ds, mytab)

objConn.Close()

' Dim ot As DataTable

ot = ds.Tables("company")

'dim dr as DataRow = ot.Rows.

'Dim dc As DataColumn

Dim s1 As Single

s1 = ot.Rows.Count

Dim dr As DataRow

For Each dr In ds.Tables("company").Rows

' TextBox3.Text = dr("company")

' ComboBox1.Items.Add(dr("company"))

Console.WriteLine(dr("company"))

Next

s1 = ot.Columns.Count

' TextBox2.Text = s1

dv = ot.DefaultView

setcontbind()



TextBox1.DataBindings.Add("text", dv, "company")

Catch myexception As System.Exception

Windows.Forms.MessageBox.Show(myexception.Message)

End Try

End If

End Sub

Private Sub setcontbind()

TextBox2.DataBindings.Add("text", ds, "company.company")

End Sub

Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As
System.EventArgs) Handles Button2.Click

Me.BindingContext(ds, mytab).Position -= 1

End Sub

Private Sub Button3_Click(ByVal sender As System.Object, ByVal e As
System.EventArgs) Handles Button3.Click

da.Update(ds)


End Sub

End Class


.
Click to expand...
 
A

art heyman

very kind of you - while I have some who knows this environment; is it
possible to simplify VB data handling ? All I need is a constant
connection to a local data source on a LAN ; would this allow me to rid
my code of all this excess complexity ? … and while I’m asking, is the
any way to turn off the precise scoping and declaration it demands ? I
just want to turn it into a simple effective language that lets me work
….
 

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