form1.vb

黑魔方vb.net数据库开发第4章第一例源码

Public Class Form1
    Inherits System.Windows.Forms.Form

#Region " Windows 窗体设计器生成的代码 "

    Public Sub New()
        MyBase.New()

        '该调用是 Windows 窗体设计器所必需的。
        InitializeComponent()

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

    End Sub

    '窗体重写处置以清理组件列表。
    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 窗体设计器所必需的
    Private components As System.ComponentModel.IContainer

    '注意：以下过程是 Windows 窗体设计器所必需的
    '可以使用 Windows 窗体设计器修改此过程。
    '不要使用代码编辑器修改它。
    Friend WithEvents Button1 As System.Windows.Forms.Button
    Friend WithEvents Button2 As System.Windows.Forms.Button
    Friend WithEvents ComboBox1 As System.Windows.Forms.ComboBox
    Friend WithEvents Button3 As System.Windows.Forms.Button
    <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
        Me.Button1 = New System.Windows.Forms.Button()
        Me.Button2 = New System.Windows.Forms.Button()
        Me.ComboBox1 = New System.Windows.Forms.ComboBox()
        Me.Button3 = New System.Windows.Forms.Button()
        Me.SuspendLayout()
        '
        'Button1
        '
        Me.Button1.Location = New System.Drawing.Point(40, 152)
        Me.Button1.Name = "Button1"
        Me.Button1.Size = New System.Drawing.Size(96, 48)
        Me.Button1.TabIndex = 0
        Me.Button1.Text = "删除订单"
        '
        'Button2
        '
        Me.Button2.Location = New System.Drawing.Point(160, 152)
        Me.Button2.Name = "Button2"
        Me.Button2.Size = New System.Drawing.Size(112, 48)
        Me.Button2.TabIndex = 1
        Me.Button2.Text = "将订单号加入到combobox1"
        '
        'ComboBox1
        '
        Me.ComboBox1.Location = New System.Drawing.Point(136, 16)
        Me.ComboBox1.Name = "ComboBox1"
        Me.ComboBox1.Size = New System.Drawing.Size(184, 23)
        Me.ComboBox1.TabIndex = 2
        Me.ComboBox1.Text = "ComboBox1"
        '
        'Button3
        '
        Me.Button3.Location = New System.Drawing.Point(288, 152)
        Me.Button3.Name = "Button3"
        Me.Button3.Size = New System.Drawing.Size(104, 48)
        Me.Button3.TabIndex = 3
        Me.Button3.Text = "字段名加入到combobox1"
        '
        'Form1
        '
        Me.AutoScaleBaseSize = New System.Drawing.Size(8, 18)
        Me.ClientSize = New System.Drawing.Size(424, 224)
        Me.Controls.AddRange(New System.Windows.Forms.Control() {Me.Button3, Me.ComboBox1, Me.Button2, Me.Button1})
        Me.Name = "Form1"
        Me.Text = "操作记录集示例"
        Me.ResumeLayout(False)

    End Sub

#End Region
    Dim con As New ADODB.Connection()
    Dim rs As New ADODB.Recordset()
    Sub opendb()
        '使用OLE DB连接到SQL
        con.Open("Provider=SQLOLEDB.1;Integrated Security=SSPI;Persist Security Info=False;" _
& "Database=Northwind")
    End Sub
    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        If IsNumeric(ComboBox1.Text) Then
            opendb()
            con.Execute("delete from [order details] where orderid=" & ComboBox1.Text)
            MsgBox("删除完毕！")
            con.Close()
        End If
    End Sub

    Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
        opendb()
        rs.Open("orders", con, ADODB.CursorTypeEnum.adOpenKeyset)
        ComboBox1.Items.Clear()
        Do While Not rs.EOF
            ComboBox1.Items.Add(rs(0).Value)
            rs.MoveNext()
        Loop
        con.Close()

    End Sub

    Private Sub Button3_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button3.Click
        opendb()
        Dim i As Integer
        ComboBox1.Items.Clear()
        rs.Open("select * from orders", con, ADODB.CursorTypeEnum.adOpenKeyset)
        For i = 0 To rs.Fields.Count - 1
            ComboBox1.Items.Add(rs(i).Name)
        Next
        con.Close()
    End Sub

    Private Sub Button4_Click(ByVal sender As System.Object, ByVal e As System.EventArgs)
        Dim con As New ADODB.Connection()
        Dim rs As New ADODB.Recordset()
        con.Open("Provider=SQLOLEDB.1;Integrated Security=SSPI;Persist Security Info=False;" _
        & "Database=Northwind")
        rs.Open("orders", con, ADODB.CursorTypeEnum.adOpenKeyset)
        rs.Filter = "customerid='VINET'"

    End Sub

    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load

    End Sub
End Class