admin.vb

我大2做的一个关于面向对象的课程设计

Imports System.Data
Imports System.Data.OleDb

Public Class admin
    Inherits System.Windows.Forms.Form

    Dim Sql As String = "Provider=Microsoft.Jet.OLEDB.4.0;Password=;User ID=Admin;Data Source=计算机选课系统.mdb"
    Dim Conn As New OleDbConnection(Sql)
    Dim ds As New DataSet
    Dim tb As DataTable
    Dim comm As OleDbCommand

#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 Button3 As System.Windows.Forms.Button
    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 t2 As System.Windows.Forms.TextBox
    Friend WithEvents t1 As System.Windows.Forms.TextBox
    Friend WithEvents B1 As System.Windows.Forms.Button
    Friend WithEvents B2 As System.Windows.Forms.Button
    <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
        Me.B1 = New System.Windows.Forms.Button
        Me.B2 = New System.Windows.Forms.Button
        Me.t2 = New System.Windows.Forms.TextBox
        Me.t1 = New System.Windows.Forms.TextBox
        Me.Button3 = New System.Windows.Forms.Button
        Me.Label1 = New System.Windows.Forms.Label
        Me.Label2 = New System.Windows.Forms.Label
        Me.Label3 = New System.Windows.Forms.Label
        Me.SuspendLayout()
        '
        'B1
        '
        Me.B1.Location = New System.Drawing.Point(32, 248)
        Me.B1.Name = "B1"
        Me.B1.TabIndex = 0
        Me.B1.Text = "学生信息"
        Me.B1.Visible = False
        '
        'B2
        '
        Me.B2.Location = New System.Drawing.Point(208, 248)
        Me.B2.Name = "B2"
        Me.B2.TabIndex = 1
        Me.B2.Text = "选课信息"
        Me.B2.Visible = False
        '
        't2
        '
        Me.t2.Location = New System.Drawing.Point(88, 160)
        Me.t2.Name = "t2"
        Me.t2.PasswordChar = Microsoft.VisualBasic.ChrW(42)
        Me.t2.TabIndex = 2
        Me.t2.Text = ""
        '
        't1
        '
        Me.t1.Location = New System.Drawing.Point(88, 128)
        Me.t1.Name = "t1"
        Me.t1.TabIndex = 3
        Me.t1.Text = ""
        '
        'Button3
        '
        Me.Button3.Location = New System.Drawing.Point(240, 160)
        Me.Button3.Name = "Button3"
        Me.Button3.TabIndex = 4
        Me.Button3.Text = "登录"
        '
        'Label1
        '
        Me.Label1.Location = New System.Drawing.Point(104, 32)
        Me.Label1.Name = "Label1"
        Me.Label1.TabIndex = 5
        Me.Label1.Text = "管理入口"
        '
        'Label2
        '
        Me.Label2.Location = New System.Drawing.Point(32, 128)
        Me.Label2.Name = "Label2"
        Me.Label2.Size = New System.Drawing.Size(48, 23)
        Me.Label2.TabIndex = 6
        Me.Label2.Text = "用户名"
        '
        'Label3
        '
        Me.Label3.Location = New System.Drawing.Point(40, 160)
        Me.Label3.Name = "Label3"
        Me.Label3.Size = New System.Drawing.Size(40, 23)
        Me.Label3.TabIndex = 7
        Me.Label3.Text = "密码"
        '
        'admin
        '
        Me.AutoScaleBaseSize = New System.Drawing.Size(6, 14)
        Me.BackColor = System.Drawing.SystemColors.Control
        Me.ClientSize = New System.Drawing.Size(342, 306)
        Me.Controls.Add(Me.Label3)
        Me.Controls.Add(Me.Label2)
        Me.Controls.Add(Me.Label1)
        Me.Controls.Add(Me.Button3)
        Me.Controls.Add(Me.t1)
        Me.Controls.Add(Me.t2)
        Me.Controls.Add(Me.B2)
        Me.Controls.Add(Me.B1)
        Me.MaximizeBox = False
        Me.Name = "admin"
        Me.Text = "admin"
        Me.ResumeLayout(False)

    End Sub

#End Region

    Private Sub Button3_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button3.Click
        Dim sql As String
        If t1.Text <> "" And t2.Text <> "" Then
            Try
                sql = "select * from 管理员 where tid =" & "'" & t1.Text & "'"
                Dim da As New OleDbDataAdapter(sql, gLinkString)
                Dim ds As New DataSet
                Dim tb As DataTable
                da.Fill(ds, "MyTable")
                tb = ds.Tables("MyTable")
                If tb.Rows.Count() = 0 Then
                    MsgBox("对不起，您输入的帐号不存在！", MsgBoxStyle.OKOnly + MsgBoxStyle.Information, "谢谢使用")
                    t1.Focus()
                ElseIf tb.Rows(0).Item("tpws").ToString <> t2.Text Then
                    MsgBox("您的帐号或者密码输入不正确！请重新登录！", MsgBoxStyle.OKOnly + MsgBoxStyle.Critical, "登录失败")
                    t1.Focus()
                Else
                    MessageBox.Show("登陆成功")
                    B1.Visible = True
                    B2.Visible = True
                    Button3.Visible = False
                End If
            Catch ex As Exception
                MsgBox(Err.Description)
                t1.Focus()
            End Try
        Else
            t1.Focus()
            If t1.Text = "" Then
                MsgBox("帐号不能为空！", MsgBoxStyle.OKOnly + MsgBoxStyle.Exclamation, "学号为空")
            Else
                MsgBox("密码不能为空！", MsgBoxStyle.OKOnly + MsgBoxStyle.Exclamation, "密码为空")
            End If
        End If
        t1.Text = ""
        t2.Text = ""
    End Sub

    Private Sub B1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles B1.Click
        Dim stuiform As New stui
        stuiform.ShowDialog(Me)
    End Sub

    Private Sub B2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles B2.Click
        Dim lciform As New lci
        lciform.ShowDialog(Me)
    End Sub

    Private Sub admin_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        t1.Focus()

    End Sub
End Class