frmuser.vb

简单的VFP 图书管理系统

Imports System.Data.SqlClient
Public Class frmUser
    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 TextBox1 As System.Windows.Forms.TextBox
    Friend WithEvents TextBox2 As System.Windows.Forms.TextBox
    Friend WithEvents Button1 As System.Windows.Forms.Button
    Friend WithEvents Button2 As System.Windows.Forms.Button
    Friend WithEvents Label3 As System.Windows.Forms.Label
    <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
        Me.Label1 = New System.Windows.Forms.Label
        Me.Label2 = New System.Windows.Forms.Label
        Me.TextBox1 = New System.Windows.Forms.TextBox
        Me.TextBox2 = New System.Windows.Forms.TextBox
        Me.Button1 = New System.Windows.Forms.Button
        Me.Button2 = New System.Windows.Forms.Button
        Me.Label3 = New System.Windows.Forms.Label
        Me.SuspendLayout()
        '
        'Label1
        '
        Me.Label1.Location = New System.Drawing.Point(32, 56)
        Me.Label1.Name = "Label1"
        Me.Label1.Size = New System.Drawing.Size(56, 24)
        Me.Label1.TabIndex = 0
        Me.Label1.Text = "用户名："
        '
        'Label2
        '
        Me.Label2.Location = New System.Drawing.Point(32, 104)
        Me.Label2.Name = "Label2"
        Me.Label2.Size = New System.Drawing.Size(56, 24)
        Me.Label2.TabIndex = 1
        Me.Label2.Text = "密  码："
        '
        'TextBox1
        '
        Me.TextBox1.Location = New System.Drawing.Point(88, 56)
        Me.TextBox1.Name = "TextBox1"
        Me.TextBox1.Size = New System.Drawing.Size(136, 21)
        Me.TextBox1.TabIndex = 2
        Me.TextBox1.Text = ""
        '
        'TextBox2
        '
        Me.TextBox2.Location = New System.Drawing.Point(88, 104)
        Me.TextBox2.Name = "TextBox2"
        Me.TextBox2.PasswordChar = Microsoft.VisualBasic.ChrW(42)
        Me.TextBox2.Size = New System.Drawing.Size(136, 21)
        Me.TextBox2.TabIndex = 3
        Me.TextBox2.Text = ""
        '
        'Button1
        '
        Me.Button1.Location = New System.Drawing.Point(40, 168)
        Me.Button1.Name = "Button1"
        Me.Button1.Size = New System.Drawing.Size(56, 24)
        Me.Button1.TabIndex = 4
        Me.Button1.Text = "登  陆"
        '
        'Button2
        '
        Me.Button2.Location = New System.Drawing.Point(136, 168)
        Me.Button2.Name = "Button2"
        Me.Button2.Size = New System.Drawing.Size(56, 24)
        Me.Button2.TabIndex = 5
        Me.Button2.Text = "取  消"
        '
        'Label3
        '
        Me.Label3.ForeColor = System.Drawing.Color.Blue
        Me.Label3.Location = New System.Drawing.Point(32, 16)
        Me.Label3.Name = "Label3"
        Me.Label3.Size = New System.Drawing.Size(208, 24)
        Me.Label3.TabIndex = 6
        Me.Label3.Text = "初始用户名和密码都为：admin"
        '
        'frmUser
        '
        Me.AutoScaleBaseSize = New System.Drawing.Size(6, 14)
        Me.BackColor = System.Drawing.SystemColors.ActiveCaptionText
        Me.ClientSize = New System.Drawing.Size(256, 230)
        Me.Controls.Add(Me.Label3)
        Me.Controls.Add(Me.Button2)
        Me.Controls.Add(Me.Button1)
        Me.Controls.Add(Me.TextBox2)
        Me.Controls.Add(Me.TextBox1)
        Me.Controls.Add(Me.Label2)
        Me.Controls.Add(Me.Label1)
        Me.Name = "frmUser"
        Me.StartPosition = System.Windows.Forms.FormStartPosition.CenterScreen
        Me.Text = "登陆窗口"
        Me.ResumeLayout(False)

    End Sub

#End Region
    'Public UserStatus As String
    'Public Maxlogintimes As String = 3
    Public User As String
    Public password As String
    Dim conn As New SqlConnection("Server=.;" & _
                                 "Database=ViBook; " & _
                                 "Integrated Security=SSPI ")
    Dim comm As New SqlCommand
    Dim ds As New DataSet
    Dim da As New SqlDataAdapter
    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        User = TextBox1.Text
        password = TextBox2.Text
        Dim str As String
        str = "select * from 管理员信息 where 姓名='" & User & "' and 密码='" & password & "'"
        comm.Connection = conn
        comm.CommandType = CommandType.Text
        comm.CommandText = str
        da.SelectCommand = comm
        Try
            conn.Open()
            da.Fill(ds)
            If ds.Tables(0).Rows.Count <> 0 Then
                Dim frm2 As New frmMain
                frm2.Show()
                Me.Hide()
            Else
                MessageBox.Show("密码或用户名错误，请重新输入", "提示信息")
                TextBox1.Text = ""
                TextBox2.Text = ""
                TextBox1.Focus()
            End If
        Catch ex As Exception
            MessageBox.Show("登陆失败", "提示信息")
        End Try
    End Sub
    Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
        Me.Close()
        Application.Exit()
    End Sub

    Private Sub TextBox2_KeyPress(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyPressEventArgs) Handles TextBox2.KeyPress
        If e.KeyChar = Microsoft.VisualBasic.ChrW(13) _
              And TextBox2.Text <> "" Then
            Me.Button1_Click(Nothing, Nothing)
        End If
    End Sub
End Class