frm_deluser.vb

基于VBNET编写的图书馆管理系统

Imports System.Data.OleDb
Public Class frm_DelUser
    Inherits System.Windows.Forms.Form
    Dim MyConnection As New OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" & Application.StartupPath & "\library.mdb")
    Dim MyCommand As OleDbCommand
    Dim MyReader As OleDbDataReader
#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 Label12 As System.Windows.Forms.Label
    Friend WithEvents BtDel As System.Windows.Forms.Button
    Friend WithEvents LvUser As System.Windows.Forms.ListView
    Friend WithEvents ColumnHeader1 As System.Windows.Forms.ColumnHeader
    Friend WithEvents ColumnHeader2 As System.Windows.Forms.ColumnHeader
    Friend WithEvents ColumnHeader3 As System.Windows.Forms.ColumnHeader
    Friend WithEvents ColumnHeader4 As System.Windows.Forms.ColumnHeader
    Friend WithEvents ColumnHeader5 As System.Windows.Forms.ColumnHeader
    Friend WithEvents ColumnHeader6 As System.Windows.Forms.ColumnHeader
    Friend WithEvents ColumnHeader7 As System.Windows.Forms.ColumnHeader
    Friend WithEvents ColumnHeader8 As System.Windows.Forms.ColumnHeader
    Friend WithEvents ColumnHeader9 As System.Windows.Forms.ColumnHeader
    Friend WithEvents ColumnHeader10 As System.Windows.Forms.ColumnHeader
    Friend WithEvents ColumnHeader11 As System.Windows.Forms.ColumnHeader
    Friend WithEvents BtClose As System.Windows.Forms.Button
    <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
        Me.Label12 = New System.Windows.Forms.Label
        Me.BtDel = New System.Windows.Forms.Button
        Me.BtClose = New System.Windows.Forms.Button
        Me.LvUser = New System.Windows.Forms.ListView
        Me.ColumnHeader1 = New System.Windows.Forms.ColumnHeader
        Me.ColumnHeader2 = New System.Windows.Forms.ColumnHeader
        Me.ColumnHeader3 = New System.Windows.Forms.ColumnHeader
        Me.ColumnHeader4 = New System.Windows.Forms.ColumnHeader
        Me.ColumnHeader5 = New System.Windows.Forms.ColumnHeader
        Me.ColumnHeader6 = New System.Windows.Forms.ColumnHeader
        Me.ColumnHeader7 = New System.Windows.Forms.ColumnHeader
        Me.ColumnHeader8 = New System.Windows.Forms.ColumnHeader
        Me.ColumnHeader9 = New System.Windows.Forms.ColumnHeader
        Me.ColumnHeader10 = New System.Windows.Forms.ColumnHeader
        Me.ColumnHeader11 = New System.Windows.Forms.ColumnHeader
        Me.SuspendLayout()
        '
        'Label12
        '
        Me.Label12.Location = New System.Drawing.Point(22, 9)
        Me.Label12.Name = "Label12"
        Me.Label12.Size = New System.Drawing.Size(104, 24)
        Me.Label12.TabIndex = 19
        Me.Label12.Text = "用户列表："
        Me.Label12.TextAlign = System.Drawing.ContentAlignment.MiddleLeft
        '
        'BtDel
        '
        Me.BtDel.Location = New System.Drawing.Point(204, 244)
        Me.BtDel.Name = "BtDel"
        Me.BtDel.Size = New System.Drawing.Size(92, 26)
        Me.BtDel.TabIndex = 20
        Me.BtDel.Text = "删除"
        '
        'BtClose
        '
        Me.BtClose.Location = New System.Drawing.Point(361, 244)
        Me.BtClose.Name = "BtClose"
        Me.BtClose.Size = New System.Drawing.Size(100, 26)
        Me.BtClose.TabIndex = 21
        Me.BtClose.Text = "关闭"
        '
        'LvUser
        '
        Me.LvUser.Columns.AddRange(New System.Windows.Forms.ColumnHeader() {Me.ColumnHeader1, Me.ColumnHeader2, Me.ColumnHeader3, Me.ColumnHeader4, Me.ColumnHeader5, Me.ColumnHeader6, Me.ColumnHeader7, Me.ColumnHeader8, Me.ColumnHeader9, Me.ColumnHeader10, Me.ColumnHeader11})
        Me.LvUser.Location = New System.Drawing.Point(12, 36)
        Me.LvUser.MultiSelect = False
        Me.LvUser.Name = "LvUser"
        Me.LvUser.Size = New System.Drawing.Size(643, 186)
        Me.LvUser.TabIndex = 22
        Me.LvUser.UseCompatibleStateImageBehavior = False
        Me.LvUser.View = System.Windows.Forms.View.Details
        '
        'ColumnHeader1
        '
        Me.ColumnHeader1.Text = "用户编号"
        '
        'ColumnHeader2
        '
        Me.ColumnHeader2.Text = "用户姓名"
        '
        'ColumnHeader3
        '
        Me.ColumnHeader3.Text = "密码"
        Me.ColumnHeader3.Width = 38
        '
        'ColumnHeader4
        '
        Me.ColumnHeader4.Text = "状态"
        Me.ColumnHeader4.Width = 42
        '
        'ColumnHeader5
        '
        Me.ColumnHeader5.Text = "地址"
        Me.ColumnHeader5.Width = 50
        '
        'ColumnHeader6
        '
        Me.ColumnHeader6.Text = "电话"
        Me.ColumnHeader6.Width = 40
        '
        'ColumnHeader7
        '
        Me.ColumnHeader7.Text = "手机"
        Me.ColumnHeader7.Width = 42
        '
        'ColumnHeader8
        '
        Me.ColumnHeader8.Text = "Email"
        Me.ColumnHeader8.Width = 44
        '
        'ColumnHeader9
        '
        Me.ColumnHeader9.Text = "系统管理员权限"
        Me.ColumnHeader9.Width = 105
        '
        'ColumnHeader10
        '
        Me.ColumnHeader10.Text = "图书管理员权限"
        Me.ColumnHeader10.Width = 98
        '
        'ColumnHeader11
        '
        Me.ColumnHeader11.Text = "一般管理员权限"
        Me.ColumnHeader11.Width = 98
        '
        'frm_DelUser
        '
        Me.AutoScaleBaseSize = New System.Drawing.Size(6, 14)
        Me.ClientSize = New System.Drawing.Size(667, 282)
        Me.Controls.Add(Me.LvUser)
        Me.Controls.Add(Me.BtClose)
        Me.Controls.Add(Me.BtDel)
        Me.Controls.Add(Me.Label12)
        Me.MaximizeBox = False
        Me.Name = "frm_DelUser"
        Me.Text = "删除用户"
        Me.ResumeLayout(False)

    End Sub

#End Region

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


    Sub LoadUser()
        LvUser.Items.Clear()

        Dim LItem As ListViewItem
        Dim SQLString As String = "SELECT * FROM SystemUsers"
        'SQL查询语句
        MyConnection.Open()
        MyCommand = New OleDbCommand(SQLString, MyConnection)
        MyReader = MyCommand.ExecuteReader()
        While MyReader.Read
            LItem = New ListViewItem(MyReader("UserID").ToString)
            LItem.SubItems.Add(MyReader("UserName").ToString)
            LItem.SubItems.Add(MyReader("Password").ToString)
            LItem.SubItems.Add(MyReader("Status").ToString)
            LItem.SubItems.Add(MyReader("Address").ToString)
            LItem.SubItems.Add(MyReader("Phone").ToString)
            LItem.SubItems.Add(MyReader("CellPhone").ToString)
            LItem.SubItems.Add(MyReader("Email").ToString)
            LItem.SubItems.Add(MyReader("AdminRights").ToString)
            LItem.SubItems.Add(MyReader("LibRights").ToString)
            LItem.SubItems.Add(MyReader("ReaderRights").ToString)
            LvUser.Items.Add(LItem)
        End While
        MyConnection.Close()
        MyReader.Close()
        MyCommand.Dispose()


    End Sub

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

    Private Sub BtDel_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles BtDel.Click
        Dim SelectUser As String = LvUser.SelectedItems(0).Text
        If SelectUser = "Admin" Then
            MsgBox("不能删除管理员！", MsgBoxStyle.Exclamation, "信息框")
            Exit Sub
        End If
        Dim SQLString As String = "DELETE FROM SystemUsers WHERE UserID= '" & SelectUser & " '"
        'SQL查询语句
        MyConnection.Open()
        MyCommand = New OleDbCommand(SQLString, MyConnection)
        MyCommand.ExecuteNonQuery()
        MyConnection.Close()
        MyReader.Close()
        MyCommand.Dispose()
        MsgBox("删除操作完成！", , "信息框")
        LoadUser()
    End Sub
End Class