frmdeluser.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 frmdeluser
    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 bnCancel As System.Windows.Forms.Button
    Friend WithEvents bnDelete As System.Windows.Forms.Button
    Friend WithEvents tbUser As System.Windows.Forms.TextBox
    Friend WithEvents lbUser As System.Windows.Forms.ListBox
    <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
        Dim resources As System.Resources.ResourceManager = New System.Resources.ResourceManager(GetType(frmdeluser))
        Me.Label1 = New System.Windows.Forms.Label
        Me.bnCancel = New System.Windows.Forms.Button
        Me.bnDelete = New System.Windows.Forms.Button
        Me.tbUser = New System.Windows.Forms.TextBox
        Me.lbUser = New System.Windows.Forms.ListBox
        Me.SuspendLayout()
        '
        'Label1
        '
        Me.Label1.ForeColor = System.Drawing.Color.Red
        Me.Label1.Location = New System.Drawing.Point(176, 56)
        Me.Label1.Name = "Label1"
        Me.Label1.Size = New System.Drawing.Size(160, 23)
        Me.Label1.TabIndex = 9
        Me.Label1.Text = "请输入或者在左侧选择用户"
        '
        'bnCancel
        '
        Me.bnCancel.Location = New System.Drawing.Point(216, 184)
        Me.bnCancel.Name = "bnCancel"
        Me.bnCancel.TabIndex = 8
        Me.bnCancel.Text = "取消"
        '
        'bnDelete
        '
        Me.bnDelete.Location = New System.Drawing.Point(216, 136)
        Me.bnDelete.Name = "bnDelete"
        Me.bnDelete.TabIndex = 7
        Me.bnDelete.Text = "删除"
        '
        'tbUser
        '
        Me.tbUser.Location = New System.Drawing.Point(176, 88)
        Me.tbUser.Name = "tbUser"
        Me.tbUser.Size = New System.Drawing.Size(160, 21)
        Me.tbUser.TabIndex = 6
        Me.tbUser.Text = ""
        '
        'lbUser
        '
        Me.lbUser.ItemHeight = 12
        Me.lbUser.Location = New System.Drawing.Point(24, 8)
        Me.lbUser.Name = "lbUser"
        Me.lbUser.Size = New System.Drawing.Size(144, 256)
        Me.lbUser.TabIndex = 5
        '
        'frmdeluser
        '
        Me.AutoScaleBaseSize = New System.Drawing.Size(6, 14)
        Me.ClientSize = New System.Drawing.Size(360, 301)
        Me.Controls.Add(Me.Label1)
        Me.Controls.Add(Me.bnCancel)
        Me.Controls.Add(Me.bnDelete)
        Me.Controls.Add(Me.tbUser)
        Me.Controls.Add(Me.lbUser)
        Me.Icon = CType(resources.GetObject("$this.Icon"), System.Drawing.Icon)
        Me.Name = "frmdeluser"
        Me.Text = "----------删除借阅用户"
        Me.ResumeLayout(False)

    End Sub

#End Region

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


    Private Sub refreshList()
        lbUser.Items.Clear()
        Dim strSource As String = "workstation id=郭洪博;packet size=4096;integrated security=SSPI;initial catalog=books;persist security info=False"
        Dim strSelect As String = "select cardid from bookcard"
        Dim conn As SqlConnection = New SqlConnection(strSource)
        conn.Open()
        Dim cmd As SqlCommand = New SqlCommand(strSelect, conn)
        Dim reader As SqlDataReader = cmd.ExecuteReader()

        If Not reader.HasRows Then
            Exit Sub
        End If

        While reader.Read()
            lbUser.Items.Add(reader.Item("cardid").ToString().Trim())
        End While
        conn.Close()
    End Sub

    Private Sub lbUser_SelectedIndexChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles lbUser.SelectedIndexChanged
        tbUser.Text = lbUser.Items.Item(lbUser.SelectedIndex).ToString().Trim()
    End Sub

    Private Sub bnDelete_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles bnDelete.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 bookcard where cardid='" + tbUser.Text.Trim() + "'"

        Dim conn As SqlConnection = New SqlConnection(strSource)
        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
        conn.Close()
        refreshList()
        tbUser.Clear()
    End Sub

    Private Sub bnCancel_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles bnCancel.Click
        Me.Close()
    End Sub
End Class