form3.vb

这是一个比较完整的java语言编写的文件系统程序

Public Class Form3
    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 TextBox1 As System.Windows.Forms.TextBox
    Friend WithEvents Button1 As System.Windows.Forms.Button
    Friend WithEvents TextBox2 As System.Windows.Forms.TextBox
    Friend WithEvents Label1 As System.Windows.Forms.Label
    Friend WithEvents Label2 As System.Windows.Forms.Label
    Friend WithEvents Label3 As System.Windows.Forms.Label
    <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
        Me.TextBox1 = New System.Windows.Forms.TextBox
        Me.Button1 = New System.Windows.Forms.Button
        Me.TextBox2 = New System.Windows.Forms.TextBox
        Me.Label1 = New System.Windows.Forms.Label
        Me.Label2 = New System.Windows.Forms.Label
        Me.Label3 = New System.Windows.Forms.Label
        Me.SuspendLayout()
        '
        'TextBox1
        '
        Me.TextBox1.Location = New System.Drawing.Point(64, 64)
        Me.TextBox1.Name = "TextBox1"
        Me.TextBox1.Size = New System.Drawing.Size(144, 26)
        Me.TextBox1.TabIndex = 0
        Me.TextBox1.Text = ""
        '
        'Button1
        '
        Me.Button1.Location = New System.Drawing.Point(240, 64)
        Me.Button1.Name = "Button1"
        Me.Button1.Size = New System.Drawing.Size(56, 24)
        Me.Button1.TabIndex = 1
        Me.Button1.Text = "确定"
        '
        'TextBox2
        '
        Me.TextBox2.Location = New System.Drawing.Point(64, 112)
        Me.TextBox2.Name = "TextBox2"
        Me.TextBox2.PasswordChar = Microsoft.VisualBasic.ChrW(35)
        Me.TextBox2.Size = New System.Drawing.Size(144, 26)
        Me.TextBox2.TabIndex = 2
        Me.TextBox2.Text = ""
        '
        'Label1
        '
        Me.Label1.Location = New System.Drawing.Point(-48, 64)
        Me.Label1.Name = "Label1"
        Me.Label1.Size = New System.Drawing.Size(104, 24)
        Me.Label1.TabIndex = 4
        Me.Label1.Text = "用户名"
        Me.Label1.TextAlign = System.Drawing.ContentAlignment.MiddleRight
        '
        'Label2
        '
        Me.Label2.Location = New System.Drawing.Point(-48, 112)
        Me.Label2.Name = "Label2"
        Me.Label2.Size = New System.Drawing.Size(104, 24)
        Me.Label2.TabIndex = 5
        Me.Label2.Text = "密码"
        Me.Label2.TextAlign = System.Drawing.ContentAlignment.MiddleRight
        '
        'Label3
        '
        Me.Label3.Font = New System.Drawing.Font("隶书", 14.25!, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, CType(134, Byte))
        Me.Label3.Location = New System.Drawing.Point(88, 16)
        Me.Label3.Name = "Label3"
        Me.Label3.Size = New System.Drawing.Size(128, 32)
        Me.Label3.TabIndex = 6
        Me.Label3.Text = "删除用户"
        Me.Label3.TextAlign = System.Drawing.ContentAlignment.MiddleCenter
        '
        'Form3
        '
        Me.AutoScaleBaseSize = New System.Drawing.Size(8, 19)
        Me.ClientSize = New System.Drawing.Size(312, 150)
        Me.Controls.Add(Me.Label3)
        Me.Controls.Add(Me.Label2)
        Me.Controls.Add(Me.Label1)
        Me.Controls.Add(Me.TextBox2)
        Me.Controls.Add(Me.Button1)
        Me.Controls.Add(Me.TextBox1)
        Me.Font = New System.Drawing.Font("隶书", 12.0!, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, CType(134, Byte))
        Me.Name = "Form3"
        Me.Text = "Form3"
        Me.ResumeLayout(False)

    End Sub

#End Region

    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        Dim k As Boolean = False
        Dim mainform As New filesmanager.Form1
        Dim reader As OleDb.OleDbDataReader
        mainform.OleDbConnection1.Open()
        mainform.OleDbCommand1.CommandText = "select * from ut"
        reader = mainform.OleDbCommand1.ExecuteReader
        Do While reader.Read
            If TextBox1.Text = reader("u_name").ToString Then
                If TextBox2.Text = reader("u_password").ToString Then
                    k = True
                    Call del()
                End If
            End If
        Loop
        If k = False Then
            MessageBox.Show("用户名与密码不匹配!!")
        End If
        mainform.OleDbConnection1.Close()
    End Sub
    Sub del()
        Dim mainform As New filesmanager.Form1
        Dim reader As OleDb.OleDbDataReader
        mainform.OleDbConnection1.Open()
        mainform.OleDbCommand1.CommandText = "delete from ut where u_name  = '" & TextBox1.Text & "'"
        mainform.OleDbCommand1.ExecuteNonQuery()
        mainform.OleDbConnection1.Close()
        MessageBox.Show("成功删除!!")
        Me.Close()

    End Sub
End Class