Imports System.Data.OleDb
Public Class Form1
    Inherits System.Windows.Forms.Form
    Dim fullname = Application.StartupPath()
    Dim myfiledir As New System.IO.DirectoryInfo(fullname)
    Dim dbfile = myfiledir.Parent.Parent.FullName & "\northwind.mdb"
    Dim constr As String = "provider=microsoft.jet.oledb.4.0;data source=" & dbfile
    '定義連接
    Dim objconn As New OleDbConnection(constr)
    '定義數(shù)據(jù)適配器
    Dim objadapter As New OleDbDataAdapter("SELECT * From 產(chǎn)品", objconn)
    Dim cmd As New OleDbCommand()
    '定義數(shù)據(jù)集
    Dim ds1 As New DataSet()
    Sub showdata()
        Dim sqlstr = "select * from 產(chǎn)品 where 產(chǎn)品名稱='" & ComboBox1.Text & "'"
        cmd = New OleDbCommand(sqlstr, objconn)
        objadapter.SelectCommand = cmd
        objadapter.Fill(ds1)
        DataGrid1.DataSource = ds1.Tables(0)
    End Sub
#Region " Windows 窗體設(shè)計(jì)器生成的代碼 "

    Public Sub New()
        MyBase.New()

        '該調(diào)用是 Windows 窗體設(shè)計(jì)器所必需的。
        InitializeComponent()

        '在 InitializeComponent() 調(diào)用之后添加任何初始化

    End Sub

    '窗體重寫處置以清理組件列表。
    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

    'Windows 窗體設(shè)計(jì)器所必需的
    Private components As System.ComponentModel.IContainer

    '注意：以下過程是 Windows 窗體設(shè)計(jì)器所必需的
    '可以使用 Windows 窗體設(shè)計(jì)器修改此過程。
    '不要使用代碼編輯器修改它。
    Friend WithEvents ComboBox1 As System.Windows.Forms.ComboBox
    Friend WithEvents Label1 As System.Windows.Forms.Label
    Friend WithEvents Button3 As System.Windows.Forms.Button
    Friend WithEvents DataGrid1 As System.Windows.Forms.DataGrid
    Friend WithEvents DataGrid2 As System.Windows.Forms.DataGrid
    Friend WithEvents Button4 As System.Windows.Forms.Button
    <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
        Me.ComboBox1 = New System.Windows.Forms.ComboBox()
        Me.Label1 = New System.Windows.Forms.Label()
        Me.Button3 = New System.Windows.Forms.Button()
        Me.DataGrid1 = New System.Windows.Forms.DataGrid()
        Me.DataGrid2 = New System.Windows.Forms.DataGrid()
        Me.Button4 = New System.Windows.Forms.Button()
        CType(Me.DataGrid1, System.ComponentModel.ISupportInitialize).BeginInit()
        CType(Me.DataGrid2, System.ComponentModel.ISupportInitialize).BeginInit()
        Me.SuspendLayout()
        '
        'ComboBox1
        '
        Me.ComboBox1.Location = New System.Drawing.Point(408, 24)
        Me.ComboBox1.Name = "ComboBox1"
        Me.ComboBox1.Size = New System.Drawing.Size(208, 23)
        Me.ComboBox1.TabIndex = 1
        Me.ComboBox1.Text = "ComboBox1"
        '
        'Label1
        '
        Me.Label1.Location = New System.Drawing.Point(240, 24)
        Me.Label1.Name = "Label1"
        Me.Label1.Size = New System.Drawing.Size(152, 32)
        Me.Label1.TabIndex = 2
        Me.Label1.Text = "請(qǐng)選擇產(chǎn)品名"
        '
        'Button3
        '
        Me.Button3.Location = New System.Drawing.Point(152, 272)
        Me.Button3.Name = "Button3"
        Me.Button3.Size = New System.Drawing.Size(136, 32)
        Me.Button3.TabIndex = 4
        Me.Button3.Text = "顯示數(shù)據(jù)"
        '
        'DataGrid1
        '
        Me.DataGrid1.DataMember = ""
        Me.DataGrid1.HeaderForeColor = System.Drawing.SystemColors.ControlText
        Me.DataGrid1.Location = New System.Drawing.Point(8, 64)
        Me.DataGrid1.Name = "DataGrid1"
        Me.DataGrid1.Size = New System.Drawing.Size(440, 192)
        Me.DataGrid1.TabIndex = 5
        '
        'DataGrid2
        '
        Me.DataGrid2.DataMember = ""
        Me.DataGrid2.HeaderForeColor = System.Drawing.SystemColors.ControlText
        Me.DataGrid2.Location = New System.Drawing.Point(472, 64)
        Me.DataGrid2.Name = "DataGrid2"
        Me.DataGrid2.Size = New System.Drawing.Size(336, 192)
        Me.DataGrid2.TabIndex = 6
        '
        'Button4
        '
        Me.Button4.Location = New System.Drawing.Point(600, 272)
        Me.Button4.Name = "Button4"
        Me.Button4.Size = New System.Drawing.Size(88, 32)
        Me.Button4.TabIndex = 7
        Me.Button4.Text = "建立新表"
        '
        'Form1
        '
        Me.AutoScaleBaseSize = New System.Drawing.Size(8, 18)
        Me.ClientSize = New System.Drawing.Size(816, 320)
        Me.Controls.AddRange(New System.Windows.Forms.Control() {Me.Button4, Me.DataGrid2, Me.DataGrid1, Me.Button3, Me.Label1, Me.ComboBox1})
        Me.Name = "Form1"
        Me.Text = "Form1"
        CType(Me.DataGrid1, System.ComponentModel.ISupportInitialize).EndInit()
        CType(Me.DataGrid2, System.ComponentModel.ISupportInitialize).EndInit()
        Me.ResumeLayout(False)

    End Sub

#End Region

    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        objconn.Open()
        Dim objCmd As New OleDbCommand("SELECT * From 產(chǎn)品", objconn)
        Dim objreader As OleDbDataReader
        objreader = objCmd.ExecuteReader
        While objreader.Read
            ComboBox1.Items.Add(objreader.GetString(1))
        End While
        objreader.Close()
    End Sub

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

    Private Sub Button4_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button4.Click
        '建立一個(gè)新表people，將表增加到Dataset中
        Dim dtable As New DataTable("雇員")
        With dtable.Columns
            .Add("雇員編號(hào)", System.Type.GetType("System.Int32"))
            .Add("姓名", System.Type.GetType("System.String"))
            .Add("性別", System.Type.GetType("System.String"))
            .Add("出生年月", System.Type.GetType("System.DateTime"))
        End With
        dtable.Columns("雇員編號(hào)").AutoIncrement = True
        '判斷dtable是否已歸ds1
        If Not ds1.Tables.Contains("雇員") Then
            ds1.Tables.Add(dtable)
        End If

        Dim pkey() As DataColumn = {ds1.Tables("雇員").Columns("雇員編號(hào)")}
        ds1.Tables("雇員").PrimaryKey = pkey
        '往新建的雇員表中增加一條記錄
        Dim newrow As DataRow = dtable.NewRow
        newrow(1) = "張三"
        newrow(2) = "男"
        newrow(3) = "1980-7-8"
        dtable.Rows.Add(newrow)
        DataGrid2.DataSource = ds1.Tables("雇員")
    End Sub

 End Class