登陆.vb

图书管理系统 万千可以用于小规模的图书管理拉 用access作为数据库

Imports System.Data
Imports System.Data.OleDb
Public Class 登陆
    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 ComboBox1 As System.Windows.Forms.ComboBox
    Friend WithEvents Label3 As System.Windows.Forms.Label
    Friend WithEvents TextBox1 As System.Windows.Forms.TextBox
    Friend WithEvents Button1 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.ComboBox1 = New System.Windows.Forms.ComboBox
        Me.Label3 = New System.Windows.Forms.Label
        Me.TextBox1 = New System.Windows.Forms.TextBox
        Me.Button1 = New System.Windows.Forms.Button
        Me.SuspendLayout()
        '
        'Label1
        '
        Me.Label1.Font = New System.Drawing.Font("隶书", 21.75!, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, CType(134, Byte))
        Me.Label1.Location = New System.Drawing.Point(40, 24)
        Me.Label1.Name = "Label1"
        Me.Label1.Size = New System.Drawing.Size(192, 40)
        Me.Label1.TabIndex = 0
        Me.Label1.Text = "图书管理系统"
        '
        'Label2
        '
        Me.Label2.Location = New System.Drawing.Point(32, 96)
        Me.Label2.Name = "Label2"
        Me.Label2.Size = New System.Drawing.Size(56, 16)
        Me.Label2.TabIndex = 1
        Me.Label2.Text = "用户名"
        '
        'ComboBox1
        '
        Me.ComboBox1.Location = New System.Drawing.Point(96, 88)
        Me.ComboBox1.Name = "ComboBox1"
        Me.ComboBox1.Size = New System.Drawing.Size(121, 22)
        Me.ComboBox1.TabIndex = 2
        '
        'Label3
        '
        Me.Label3.Location = New System.Drawing.Point(32, 128)
        Me.Label3.Name = "Label3"
        Me.Label3.Size = New System.Drawing.Size(56, 16)
        Me.Label3.TabIndex = 3
        Me.Label3.Text = "密码"
        '
        'TextBox1
        '
        Me.TextBox1.Location = New System.Drawing.Point(96, 128)
        Me.TextBox1.Name = "TextBox1"
        Me.TextBox1.PasswordChar = Microsoft.VisualBasic.ChrW(42)
        Me.TextBox1.Size = New System.Drawing.Size(121, 23)
        Me.TextBox1.TabIndex = 4
        Me.TextBox1.Text = ""
        '
        'Button1
        '
        Me.Button1.Location = New System.Drawing.Point(96, 176)
        Me.Button1.Name = "Button1"
        Me.Button1.TabIndex = 5
        Me.Button1.Text = "确定"
        '
        '登陆
        '
        Me.AutoScaleBaseSize = New System.Drawing.Size(7, 16)
        Me.ClientSize = New System.Drawing.Size(292, 238)
        Me.Controls.Add(Me.Button1)
        Me.Controls.Add(Me.TextBox1)
        Me.Controls.Add(Me.Label3)
        Me.Controls.Add(Me.ComboBox1)
        Me.Controls.Add(Me.Label2)
        Me.Controls.Add(Me.Label1)
        Me.Font = New System.Drawing.Font("隶书", 10.5!, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, CType(134, Byte))
        Me.MaximizeBox = False
        Me.Name = "登陆"
        Me.Text = "登陆"
        Me.ResumeLayout(False)

    End Sub

#End Region
    Dim cmd4 As New OleDbCommand
    Dim da4 As New OleDbDataAdapter
    Dim dsa4 As New DataSet
    Sub chushi()
        Dim mycomm As New OleDbCommand("select  * from 管理员表 ", myconn)
        Dim mydataad As OleDbDataAdapter = New OleDbDataAdapter(mycomm)
        Dim mydataset As DataSet = New DataSet
        mydataad.Fill(mydataset)
        ComboBox1.DataSource = mydataset.Tables(0)
        ComboBox1.DisplayMember = "用户名"
        myconn.Close()
    End Sub
    Private Sub 登陆_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        chushi()
    End Sub

    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        Try
            Dim mimacomm As New OleDbCommand("select  * from 管理员表 where 用户名 like '" & ComboBox1.Text & "' ", myconn)
            Dim mimadataad As OleDbDataAdapter = New OleDbDataAdapter(mimacomm)
            Dim mimadataset As DataSet = New DataSet
            mimadataad.Fill(mimadataset)
            If mimadataset.Tables(0).Rows(0)("密码").ToString = TextBox1.Text Then
                guanliyuan = ComboBox1.Text
                mima = TextBox1.Text
                Me.Hide()
                Dim form As New 图书管理系统
                form.Show()
            Else
                MsgBox("小偷：您输入的密码不正确！！")
            End If
        Catch ex As Exception
            MsgBox("")
        End Try
    End Sub

End Class