Public Class frmLogin
    Inherits System.Windows.Forms.Form

#Region " Windows 窗體設計器生成的代碼 "

    Public Sub New()
        MyBase.New()

        '該調用是 Windows 窗體設計器所必需的。
        InitializeComponent()

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

    End Sub

    '窗體重寫 dispose 以清理組件列表。
    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 窗體設計器所必需的
    Private components As System.ComponentModel.IContainer

    '注意: 以下過程是 Windows 窗體設計器所必需的
    '可以使用 Windows 窗體設計器修改此過程。
    '不要使用代碼編輯器修改它。
    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 btnLogin As System.Windows.Forms.Button
    Friend WithEvents txtUserName As System.Windows.Forms.TextBox
    Friend WithEvents txtPassword As System.Windows.Forms.TextBox
    Friend WithEvents btnClose As System.Windows.Forms.Button
    Friend WithEvents btnOK As System.Windows.Forms.Button
    <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
        Me.Label1 = New System.Windows.Forms.Label
        Me.Label2 = New System.Windows.Forms.Label
        Me.Label3 = New System.Windows.Forms.Label
        Me.btnLogin = New System.Windows.Forms.Button
        Me.txtUserName = New System.Windows.Forms.TextBox
        Me.txtPassword = New System.Windows.Forms.TextBox
        Me.btnClose = New System.Windows.Forms.Button
        Me.btnOK = New System.Windows.Forms.Button
        Me.SuspendLayout()
        '
        'Label1
        '
        Me.Label1.Font = New System.Drawing.Font("宋體", 21.75!, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, CType(134, Byte))
        Me.Label1.ForeColor = System.Drawing.Color.FromArgb(CType(0, Byte), CType(0, Byte), CType(192, Byte))
        Me.Label1.Location = New System.Drawing.Point(40, 16)
        Me.Label1.Name = "Label1"
        Me.Label1.Size = New System.Drawing.Size(208, 32)
        Me.Label1.TabIndex = 0
        Me.Label1.Text = "圖書借閱系統"
        '
        'Label2
        '
        Me.Label2.Location = New System.Drawing.Point(40, 80)
        Me.Label2.Name = "Label2"
        Me.Label2.Size = New System.Drawing.Size(48, 23)
        Me.Label2.TabIndex = 0
        Me.Label2.Text = "用戶名"
        '
        'Label3
        '
        Me.Label3.Location = New System.Drawing.Point(40, 112)
        Me.Label3.Name = "Label3"
        Me.Label3.Size = New System.Drawing.Size(48, 23)
        Me.Label3.TabIndex = 0
        Me.Label3.Text = "密碼"
        '
        'btnLogin
        '
        Me.btnLogin.Location = New System.Drawing.Point(40, 152)
        Me.btnLogin.Name = "btnLogin"
        Me.btnLogin.Size = New System.Drawing.Size(48, 23)
        Me.btnLogin.TabIndex = 1
        Me.btnLogin.Text = "登錄"
        '
        'txtUserName
        '
        Me.txtUserName.Location = New System.Drawing.Point(96, 80)
        Me.txtUserName.MaxLength = 20
        Me.txtUserName.Name = "txtUserName"
        Me.txtUserName.Size = New System.Drawing.Size(104, 21)
        Me.txtUserName.TabIndex = 2
        Me.txtUserName.Text = "LI4"
        '
        'txtPassword
        '
        Me.txtPassword.Location = New System.Drawing.Point(96, 112)
        Me.txtPassword.MaxLength = 20
        Me.txtPassword.Name = "txtPassword"
        Me.txtPassword.PasswordChar = Microsoft.VisualBasic.ChrW(42)
        Me.txtPassword.Size = New System.Drawing.Size(104, 21)
        Me.txtPassword.TabIndex = 2
        Me.txtPassword.Text = "000000"
        '
        'btnClose
        '
        Me.btnClose.DialogResult = System.Windows.Forms.DialogResult.Cancel
        Me.btnClose.Location = New System.Drawing.Point(168, 152)
        Me.btnClose.Name = "btnClose"
        Me.btnClose.Size = New System.Drawing.Size(48, 23)
        Me.btnClose.TabIndex = 1
        Me.btnClose.Text = "關閉"
        '
        'btnOK
        '
        Me.btnOK.DialogResult = System.Windows.Forms.DialogResult.OK
        Me.btnOK.Location = New System.Drawing.Point(168, 152)
        Me.btnOK.Name = "btnOK"
        Me.btnOK.Size = New System.Drawing.Size(40, 23)
        Me.btnOK.TabIndex = 1
        '
        'frmLogin
        '
        Me.AcceptButton = Me.btnLogin
        Me.AutoScaleBaseSize = New System.Drawing.Size(6, 14)
        Me.CancelButton = Me.btnClose
        Me.ClientSize = New System.Drawing.Size(282, 197)
        Me.Controls.Add(Me.txtUserName)
        Me.Controls.Add(Me.btnLogin)
        Me.Controls.Add(Me.Label1)
        Me.Controls.Add(Me.Label2)
        Me.Controls.Add(Me.Label3)
        Me.Controls.Add(Me.txtPassword)
        Me.Controls.Add(Me.btnClose)
        Me.Controls.Add(Me.btnOK)
        Me.FormBorderStyle = System.Windows.Forms.FormBorderStyle.FixedDialog
        Me.MaximizeBox = False
        Me.Name = "frmLogin"
        Me.StartPosition = System.Windows.Forms.FormStartPosition.CenterScreen
        Me.ResumeLayout(False)

    End Sub

#End Region

    Dim DataReader As System.Data.OleDb.OleDbDataReader

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

    Private Sub btnLogin_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnLogin.Click
        Dim str As String
        Dim filename As String = Application.ExecutablePath()
        filename = filename.Substring(0, filename.LastIndexOf("\") + 1)
        filename = filename & "library.mdb"

        Try
            If OleConn.AccessConnection(filename, "", "") Then  '連接數據庫成功
                str = "select logpwd from 管理員 where logname='" & txtUserName.Text & "'" '構造查詢字串
                If OleConn.SelectQuery(str, DataReader) Then    '執行查詢成功
                    If DataReader.HasRows Then '如果找到   指示是否包含一行或多行
                        While DataReader.Read  '使datareader 前進到下一記錄
                            If DataReader.Item(0) = txtPassword.Text Then   '如果密碼正確
                                UserName = txtUserName.Text
                                Password = txtPassword.Text
                                btnOK.PerformClick()



                                '回到主界面
                            Else                                            '密碼不正確
                                MsgBox("密碼不正確，請檢查密碼")
                            End If
                        End While
                    Else                    '沒有找到記錄
                        MsgBox("找不到此用戶，請檢查用戶名")
                    End If
                Else        '執行查詢失敗
                    MsgBox("查詢數據庫失敗")
                End If
            Else            '連接數據庫失敗
                MsgBox("連接數據庫失敗")
            End If
        Catch ex As Exception
            OleConn.DisplayError(ex)
        Finally
            DataReader.Close()
        End Try
    End Sub

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

    End Sub
End Class