login.vb

教务管理系统：学生成绩管理

Public Class LOGIN
    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 Label2 As System.Windows.Forms.Label
    Friend WithEvents btok As System.Windows.Forms.Button
    Friend WithEvents tbname As System.Windows.Forms.TextBox
    Friend WithEvents tbpwd As System.Windows.Forms.TextBox
    Friend WithEvents btcancel 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.tbname = New System.Windows.Forms.TextBox
        Me.tbpwd = New System.Windows.Forms.TextBox
        Me.btok = New System.Windows.Forms.Button
        Me.btcancel = New System.Windows.Forms.Button
        Me.SuspendLayout()
        '
        'Label1
        '
        Me.Label1.Location = New System.Drawing.Point(32, 24)
        Me.Label1.Name = "Label1"
        Me.Label1.Size = New System.Drawing.Size(48, 23)
        Me.Label1.TabIndex = 0
        Me.Label1.Text = "用户名"
        Me.Label1.TextAlign = System.Drawing.ContentAlignment.MiddleRight
        '
        'Label2
        '
        Me.Label2.Location = New System.Drawing.Point(24, 72)
        Me.Label2.Name = "Label2"
        Me.Label2.Size = New System.Drawing.Size(48, 23)
        Me.Label2.TabIndex = 1
        Me.Label2.Text = "密码"
        Me.Label2.TextAlign = System.Drawing.ContentAlignment.MiddleRight
        '
        'tbname
        '
        Me.tbname.Location = New System.Drawing.Point(88, 24)
        Me.tbname.Name = "tbname"
        Me.tbname.TabIndex = 2
        Me.tbname.Text = ""
        '
        'tbpwd
        '
        Me.tbpwd.Location = New System.Drawing.Point(88, 72)
        Me.tbpwd.Name = "tbpwd"
        Me.tbpwd.PasswordChar = Microsoft.VisualBasic.ChrW(42)
        Me.tbpwd.Size = New System.Drawing.Size(104, 21)
        Me.tbpwd.TabIndex = 3
        Me.tbpwd.Text = ""
        '
        'btok
        '
        Me.btok.DialogResult = System.Windows.Forms.DialogResult.OK
        Me.btok.Location = New System.Drawing.Point(32, 112)
        Me.btok.Name = "btok"
        Me.btok.Size = New System.Drawing.Size(72, 23)
        Me.btok.TabIndex = 4
        Me.btok.Text = "登录"
        '
        'btcancel
        '
        Me.btcancel.DialogResult = System.Windows.Forms.DialogResult.Cancel
        Me.btcancel.Location = New System.Drawing.Point(144, 112)
        Me.btcancel.Name = "btcancel"
        Me.btcancel.Size = New System.Drawing.Size(72, 23)
        Me.btcancel.TabIndex = 7
        Me.btcancel.Text = "取消"
        '
        'LOGIN
        '
        Me.AcceptButton = Me.btok
        Me.AutoScaleBaseSize = New System.Drawing.Size(6, 14)
        Me.CancelButton = Me.btcancel
        Me.ClientSize = New System.Drawing.Size(242, 151)
        Me.Controls.Add(Me.btcancel)
        Me.Controls.Add(Me.btok)
        Me.Controls.Add(Me.tbpwd)
        Me.Controls.Add(Me.tbname)
        Me.Controls.Add(Me.Label2)
        Me.Controls.Add(Me.Label1)
        Me.FormBorderStyle = System.Windows.Forms.FormBorderStyle.FixedDialog
        Me.Name = "LOGIN"
        Me.StartPosition = System.Windows.Forms.FormStartPosition.CenterParent
        Me.Text = "登录"
        Me.ResumeLayout(False)

    End Sub

#End Region

    Public flag = False

    Private Sub btok_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btok.Click
        If Me.tbname.Text.Trim() = String.Empty Then
            MessageBox.Show("姓名不能为空")
            Me.tbname.Focus()

        ElseIf Me.tbpwd.Text.Trim() = String.Empty Then
            MessageBox.Show("密码不能为空")
            Me.tbpwd.Focus()

        Else
            Dim sql As String = "SELECT * FROM USERINFO WHERE USERID = '" + Me.tbname.Text.Trim() + "' AND USERPWD = '" + Me.tbpwd.Text.Trim() + "'"
            Dim dt As DataTable = GetDataTable(sql)

            If dt.Rows.Count = 0 Then
                MessageBox.Show("用户名不存在或密码不正确")
                Me.tbpwd.Focus()
            Else
                UserRight = dt.Rows(0)("usertype")
                UserID = Me.tbname.Text.Trim()
                flag = True
                Me.Close()
            End If
        End If
    End Sub

    Private Sub btcancel_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btcancel.Click
        Application.Exit()
    End Sub

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

    End Sub
End Class