frmbookmanage.vb

这是网络版的图书管理

Public Class frmBookManage
    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 GroupBox1 As System.Windows.Forms.GroupBox
    Friend WithEvents Label1 As System.Windows.Forms.Label
    Friend WithEvents Label2 As System.Windows.Forms.Label
    Friend WithEvents Label3 As System.Windows.Forms.Label
    Friend WithEvents NumericUpDown1 As System.Windows.Forms.NumericUpDown
    Friend WithEvents TextBox1 As System.Windows.Forms.TextBox
    Friend WithEvents ComboBox1 As System.Windows.Forms.ComboBox
    Friend WithEvents Button1 As System.Windows.Forms.Button
    <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
        Me.GroupBox1 = New System.Windows.Forms.GroupBox()
        Me.Button1 = New System.Windows.Forms.Button()
        Me.ComboBox1 = New System.Windows.Forms.ComboBox()
        Me.TextBox1 = New System.Windows.Forms.TextBox()
        Me.NumericUpDown1 = New System.Windows.Forms.NumericUpDown()
        Me.Label3 = New System.Windows.Forms.Label()
        Me.Label2 = New System.Windows.Forms.Label()
        Me.Label1 = New System.Windows.Forms.Label()
        Me.GroupBox1.SuspendLayout()
        CType(Me.NumericUpDown1, System.ComponentModel.ISupportInitialize).BeginInit()
        Me.SuspendLayout()
        '
        'GroupBox1
        '
        Me.GroupBox1.BackColor = System.Drawing.Color.FromArgb(CType(192, Byte), CType(192, Byte), CType(255, Byte))
        Me.GroupBox1.Controls.AddRange(New System.Windows.Forms.Control() {Me.Button1, Me.ComboBox1, Me.TextBox1, Me.NumericUpDown1, Me.Label3, Me.Label2, Me.Label1})
        Me.GroupBox1.Dock = System.Windows.Forms.DockStyle.Fill
        Me.GroupBox1.Name = "GroupBox1"
        Me.GroupBox1.Size = New System.Drawing.Size(292, 169)
        Me.GroupBox1.TabIndex = 0
        Me.GroupBox1.TabStop = False
        '
        'Button1
        '
        Me.Button1.FlatStyle = System.Windows.Forms.FlatStyle.Flat
        Me.Button1.ForeColor = System.Drawing.Color.Navy
        Me.Button1.Location = New System.Drawing.Point(216, 136)
        Me.Button1.Name = "Button1"
        Me.Button1.Size = New System.Drawing.Size(64, 24)
        Me.Button1.TabIndex = 6
        Me.Button1.Text = "注销"
        '
        'ComboBox1
        '
        Me.ComboBox1.Items.AddRange(New Object() {"全部注销", "部分注销"})
        Me.ComboBox1.Location = New System.Drawing.Point(96, 64)
        Me.ComboBox1.Name = "ComboBox1"
        Me.ComboBox1.Size = New System.Drawing.Size(184, 20)
        Me.ComboBox1.TabIndex = 5
        Me.ComboBox1.Text = "全部注销"
        '
        'TextBox1
        '
        Me.TextBox1.Location = New System.Drawing.Point(96, 24)
        Me.TextBox1.Name = "TextBox1"
        Me.TextBox1.Size = New System.Drawing.Size(184, 21)
        Me.TextBox1.TabIndex = 4
        Me.TextBox1.Text = ""
        '
        'NumericUpDown1
        '
        Me.NumericUpDown1.Location = New System.Drawing.Point(96, 104)
        Me.NumericUpDown1.Name = "NumericUpDown1"
        Me.NumericUpDown1.Size = New System.Drawing.Size(184, 21)
        Me.NumericUpDown1.TabIndex = 3
        '
        'Label3
        '
        Me.Label3.Location = New System.Drawing.Point(8, 104)
        Me.Label3.Name = "Label3"
        Me.Label3.Size = New System.Drawing.Size(88, 21)
        Me.Label3.TabIndex = 2
        Me.Label3.Text = "注销数目"
        Me.Label3.TextAlign = System.Drawing.ContentAlignment.MiddleLeft
        '
        'Label2
        '
        Me.Label2.Location = New System.Drawing.Point(8, 63)
        Me.Label2.Name = "Label2"
        Me.Label2.Size = New System.Drawing.Size(88, 21)
        Me.Label2.TabIndex = 1
        Me.Label2.Text = "注销类别"
        Me.Label2.TextAlign = System.Drawing.ContentAlignment.MiddleLeft
        '
        'Label1
        '
        Me.Label1.Location = New System.Drawing.Point(8, 24)
        Me.Label1.Name = "Label1"
        Me.Label1.Size = New System.Drawing.Size(88, 21)
        Me.Label1.TabIndex = 0
        Me.Label1.Text = "图书 ISBN 号"
        Me.Label1.TextAlign = System.Drawing.ContentAlignment.MiddleLeft
        '
        'frmBookManage
        '
        Me.AutoScaleBaseSize = New System.Drawing.Size(6, 14)
        Me.ClientSize = New System.Drawing.Size(292, 169)
        Me.Controls.AddRange(New System.Windows.Forms.Control() {Me.GroupBox1})
        Me.Name = "frmBookManage"
        Me.Text = "图书注销管理"
        Me.GroupBox1.ResumeLayout(False)
        CType(Me.NumericUpDown1, System.ComponentModel.ISupportInitialize).EndInit()
        Me.ResumeLayout(False)

    End Sub

#End Region

    Dim sqlstr As String
    Dim num As Integer

    Private Sub TextBox1_KeyPress(ByVal sender As Object, _
    ByVal e As System.Windows.Forms.KeyPressEventArgs) _
    Handles TextBox1.KeyPress
        If e.KeyChar = Chr(13) Then
            Dim isbn As String
            isbn = Trim(Me.TextBox1.Text)
            If isbn <> "" Then
                sqlstr = "SELECT Numbers FROM BookInfo WHERE ISBN='" & isbn & "'"
                Dim ds As New DataSet()
                ds.Clear()
                ds = GetDataFromDB(sqlstr)
                If Not ds Is Nothing Then
                    Me.NumericUpDown1.Maximum = ds.Tables(0).Rows(0)("Numbers")
                    Me.NumericUpDown1.Value = Me.NumericUpDown1.Maximum
                End If
            End If
        End If
    End Sub

    Private Sub ComboBox1_SelectedIndexChanged(ByVal sender As System.Object, _
    ByVal e As System.EventArgs) Handles ComboBox1.SelectedIndexChanged
        Select Case Me.ComboBox1.SelectedIndex
            Case 0
                Me.NumericUpDown1.Value = Me.NumericUpDown1.Maximum
                Me.NumericUpDown1.Enabled = False
            Case 1
                num = Me.NumericUpDown1.Value
                Me.NumericUpDown1.Enabled = True
        End Select
    End Sub

    Private Sub Button1_Click(ByVal sender As System.Object, _
    ByVal e As System.EventArgs) Handles Button1.Click
        Dim isbn As String
        Dim num1 As Integer
        isbn = Trim(Me.TextBox1.Text)
        If isbn <> "" Then
            Select Case Me.ComboBox1.SelectedIndex
                Case 0
                    sqlstr = "UPDATE BookInfo SET Numbers=0 WHERE ISBN ='" & isbn & "'"
                Case 1
                    num1 = Me.NumericUpDown1.Value
                    num = num - num1
                    sqlstr = "UPDATE BookInfo SET Numbers='" & num _
                    & "' WHERE ISBN ='" & isbn & "'"
            End Select
            If UpdateDataBase(sqlstr) = True Then
                MsgBox("祝贺你，图书注销成功。", MsgBoxStyle.OKOnly + _
                MsgBoxStyle.Information, "注销成功")
            End If
        End If
    End Sub

End Class