Relational Data Navigation
Imports System.Data.SqlClient
Imports System.Windows.Forms
<Global.Microsoft.VisualBasic.CompilerServices.DesignerGenerated()> _
Partial Class Relation
Inherits System.Windows.Forms.Form
<System.Diagnostics.DebuggerStepThrough()> _
Private Sub InitializeComponent()
Me.cmdClear = New System.Windows.Forms.Button
Me.cmdFill = New System.Windows.Forms.Button
Me.lstOrder = New System.Windows.Forms.ListBox
Me.SuspendLayout()
'
'cmdClear
'
Me.cmdClear.Anchor = CType((System.Windows.Forms.AnchorStyles.Bottom Or System.Windows.Forms.AnchorStyles.Right), System.Windows.Forms.AnchorStyles)
Me.cmdClear.Location = New System.Drawing.Point(210, 238)
Me.cmdClear.Name = "cmdClear"
Me.cmdClear.Size = New System.Drawing.Size(72, 24)
Me.cmdClear.TabIndex = 5
Me.cmdClear.Text = "Clear"
'
'cmdFill
'
Me.cmdFill.Anchor = CType((System.Windows.Forms.AnchorStyles.Bottom Or System.Windows.Forms.AnchorStyles.Left), System.Windows.Forms.AnchorStyles)
Me.cmdFill.Location = New System.Drawing.Point(10, 238)
Me.cmdFill.Name = "cmdFill"
Me.cmdFill.Size = New System.Drawing.Size(72, 24)
Me.cmdFill.TabIndex = 4
Me.cmdFill.Text = "Fill"
'
'lstOrder
'
Me.lstOrder.Anchor = CType((((System.Windows.Forms.AnchorStyles.Top Or System.Windows.Forms.AnchorStyles.Bottom) _
Or System.Windows.Forms.AnchorStyles.Left) _
Or System.Windows.Forms.AnchorStyles.Right), System.Windows.Forms.AnchorStyles)
Me.lstOrder.IntegralHeight = False
Me.lstOrder.Location = New System.Drawing.Point(10, 3)
Me.lstOrder.Name = "lstOrder"
Me.lstOrder.Size = New System.Drawing.Size(272, 229)
Me.lstOrder.TabIndex = 3
'
'Relation
'
Me.AutoScaleDimensions = New System.Drawing.SizeF(6.0!, 13.0!)
Me.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font
Me.ClientSize = New System.Drawing.Size(292, 267)
Me.Controls.Add(Me.cmdClear)
Me.Controls.Add(Me.cmdFill)
Me.Controls.Add(Me.lstOrder)
Me.Font = New System.Drawing.Font("Tahoma", 8.25!, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, CType(0, Byte))
Me.Name = "Relation"
Me.Text = "Relation"
Me.ResumeLayout(False)
End Sub
Friend WithEvents cmdClear As System.Windows.Forms.Button
Friend WithEvents cmdFill As System.Windows.Forms.Button
Friend WithEvents lstOrder As System.Windows.Forms.ListBox
Private Sub cmdFill_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles cmdFill.Click
Dim Connect As String = "Data Source=localhost;Integrated Security=True;Initial Catalog=Northwind;"
Dim con As New SqlConnection(Connect)
Dim SQL As String = "SELECT * FROM Orders "
Dim cmd As New SqlCommand(SQL, con)
Dim adapter As New SqlDataAdapter(cmd)
Dim dsNorthwind As New DataSet()
con.Open()
adapter.Fill(dsNorthwind, "Orders")
cmd.CommandText = "SELECT * FROM Customers"
adapter.Fill(dsNorthwind, "Customers")
cmd.CommandText = "SELECT * FROM Employees"
adapter.Fill(dsNorthwind, "Employees")
con.Close()
Dim relCustomersOrders As New DataRelation("CustomersOrders", _
dsNorthwind.Tables("Customers").Columns("CustomerID"), _
dsNorthwind.Tables("Orders").Columns("CustomerID"))
dsNorthwind.Relations.Add(relCustomersOrders)
Dim rowParent, rowChild As DataRow
For Each rowParent In dsNorthwind.Tables("Customers").Rows
For Each rowChild In rowParent.GetChildRows(relCustomersOrders)
lstOrder.Items.Add(rowParent("CompanyName") & _
" ordered on " & rowChild("OrderDate"))
Next
Next
End Sub
Private Sub cmdClear_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles cmdClear.Click
lstOrder.Items.Clear()
End Sub
End Class
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