frmdelbook.vb

基于VB.NET开发的简单的图书馆管理系统,可正常运行以测试,内带源码.

Imports System.Data
Imports System.Data.SqlClient
Public Class frmDelBook
    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 dispose 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 Label1 As System.Windows.Forms.Label
    Friend WithEvents tbDel As System.Windows.Forms.Button
    Friend WithEvents bnCancle As System.Windows.Forms.Button
    Friend WithEvents tbbookid As System.Windows.Forms.TextBox
    <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
        Dim resources As System.Resources.ResourceManager = New System.Resources.ResourceManager(GetType(frmDelBook))
        Me.tbbookid = New System.Windows.Forms.TextBox
        Me.Label1 = New System.Windows.Forms.Label
        Me.tbDel = New System.Windows.Forms.Button
        Me.bnCancle = New System.Windows.Forms.Button
        Me.SuspendLayout()
        '
        'tbbookid
        '
        Me.tbbookid.Location = New System.Drawing.Point(8, 48)
        Me.tbbookid.Name = "tbbookid"
        Me.tbbookid.Size = New System.Drawing.Size(168, 21)
        Me.tbbookid.TabIndex = 0
        Me.tbbookid.Text = ""
        '
        'Label1
        '
        Me.Label1.Location = New System.Drawing.Point(8, 24)
        Me.Label1.Name = "Label1"
        Me.Label1.Size = New System.Drawing.Size(112, 16)
        Me.Label1.TabIndex = 1
        Me.Label1.Text = "请输入图书编号："
        '
        'tbDel
        '
        Me.tbDel.Location = New System.Drawing.Point(8, 96)
        Me.tbDel.Name = "tbDel"
        Me.tbDel.TabIndex = 2
        Me.tbDel.Text = "删除"
        '
        'bnCancle
        '
        Me.bnCancle.Location = New System.Drawing.Point(104, 96)
        Me.bnCancle.Name = "bnCancle"
        Me.bnCancle.TabIndex = 3
        Me.bnCancle.Text = "取消"
        '
        'frmDelBook
        '
        Me.AutoScaleBaseSize = New System.Drawing.Size(6, 14)
        Me.ClientSize = New System.Drawing.Size(184, 141)
        Me.Controls.Add(Me.bnCancle)
        Me.Controls.Add(Me.tbDel)
        Me.Controls.Add(Me.Label1)
        Me.Controls.Add(Me.tbbookid)
        Me.Icon = CType(resources.GetObject("$this.Icon"), System.Drawing.Icon)
        Me.Name = "frmDelBook"
        Me.Text = "----删除图书"
        Me.ResumeLayout(False)

    End Sub

#End Region


    Private Sub tbDel_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles tbDel.Click
        Dim strSource As String = "workstation id=郭洪博;packet size=4096;integrated security=SSPI;initial catalog=books;persist security info=False"
        Dim strDelete As String = "delete from books where bookid='" + tbBookid.Text.Trim() + "'"

        Dim conn As SqlConnection = New SqlConnection(strSource)
        Try

            conn.Open()
            Dim cmd As SqlCommand = New SqlCommand(strDelete, conn)
            Dim ret As Integer = cmd.ExecuteNonQuery()
            If ret <> 1 Then
                MessageBox.Show("操作失败！")
            Else
                MessageBox.Show("删除成功！")
            End If
        Catch ex As Exception
            MessageBox.Show("操作失败！")
            MessageBox.Show(ex.ToString)
        End Try

        conn.Close()
        tbbookid.Clear()

    End Sub
    Private Sub bnCancle_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles bnCancle.Click
        Me.Close()
    End Sub

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

    End Sub
End Class