form1.vb

VB与ACCESS数据库制作的的注册登陆查询系统

Public Class Form1
    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 TextBox1 As System.Windows.Forms.TextBox
    Friend WithEvents Label2 As System.Windows.Forms.Label
    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 OleDbDataAdapter1 As System.Data.OleDb.OleDbDataAdapter
    Friend WithEvents OleDbSelectCommand1 As System.Data.OleDb.OleDbCommand
    Friend WithEvents OleDbInsertCommand1 As System.Data.OleDb.OleDbCommand
    Friend WithEvents OleDbUpdateCommand1 As System.Data.OleDb.OleDbCommand
    Friend WithEvents OleDbDeleteCommand1 As System.Data.OleDb.OleDbCommand
    Friend WithEvents OleDbConnection1 As System.Data.OleDb.OleDbConnection
    Friend WithEvents DataSet11 As WindowsApplication1.DataSet1
    <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
        Me.Label1 = New System.Windows.Forms.Label
        Me.TextBox1 = New System.Windows.Forms.TextBox
        Me.Label2 = New System.Windows.Forms.Label
        Me.TextBox2 = New System.Windows.Forms.TextBox
        Me.Button1 = New System.Windows.Forms.Button
        Me.Button2 = New System.Windows.Forms.Button
        Me.OleDbDataAdapter1 = New System.Data.OleDb.OleDbDataAdapter
        Me.OleDbDeleteCommand1 = New System.Data.OleDb.OleDbCommand
        Me.OleDbConnection1 = New System.Data.OleDb.OleDbConnection
        Me.OleDbInsertCommand1 = New System.Data.OleDb.OleDbCommand
        Me.OleDbSelectCommand1 = New System.Data.OleDb.OleDbCommand
        Me.OleDbUpdateCommand1 = New System.Data.OleDb.OleDbCommand
        Me.DataSet11 = New WindowsApplication1.DataSet1
        CType(Me.DataSet11, System.ComponentModel.ISupportInitialize).BeginInit()
        Me.SuspendLayout()
        '
        'Label1
        '
        Me.Label1.AutoSize = True
        Me.Label1.Font = New System.Drawing.Font("宋体", 15.0!, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, CType(134, Byte))
        Me.Label1.ForeColor = System.Drawing.Color.Magenta
        Me.Label1.Location = New System.Drawing.Point(16, 16)
        Me.Label1.Name = "Label1"
        Me.Label1.Size = New System.Drawing.Size(69, 26)
        Me.Label1.TabIndex = 0
        Me.Label1.Text = "用户名"
        '
        'TextBox1
        '
        Me.TextBox1.Location = New System.Drawing.Point(208, 16)
        Me.TextBox1.Name = "TextBox1"
        Me.TextBox1.Size = New System.Drawing.Size(136, 21)
        Me.TextBox1.TabIndex = 1
        Me.TextBox1.Text = ""
        '
        'Label2
        '
        Me.Label2.AutoSize = True
        Me.Label2.Font = New System.Drawing.Font("宋体", 15.0!, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, CType(134, Byte))
        Me.Label2.ForeColor = System.Drawing.Color.Magenta
        Me.Label2.Location = New System.Drawing.Point(16, 80)
        Me.Label2.Name = "Label2"
        Me.Label2.Size = New System.Drawing.Size(48, 26)
        Me.Label2.TabIndex = 2
        Me.Label2.Text = "密码"
        '
        'TextBox2
        '
        Me.TextBox2.Location = New System.Drawing.Point(208, 80)
        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(152, 288)
        Me.Button1.Name = "Button1"
        Me.Button1.Size = New System.Drawing.Size(112, 48)
        Me.Button1.TabIndex = 4
        Me.Button1.Text = "登陆"
        '
        'Button2
        '
        Me.Button2.Location = New System.Drawing.Point(312, 296)
        Me.Button2.Name = "Button2"
        Me.Button2.Size = New System.Drawing.Size(136, 48)
        Me.Button2.TabIndex = 5
        Me.Button2.Text = "注册"
        '
        'OleDbDataAdapter1
        '
        Me.OleDbDataAdapter1.DeleteCommand = Me.OleDbDeleteCommand1
        Me.OleDbDataAdapter1.InsertCommand = Me.OleDbInsertCommand1
        Me.OleDbDataAdapter1.SelectCommand = Me.OleDbSelectCommand1
        Me.OleDbDataAdapter1.TableMappings.AddRange(New System.Data.Common.DataTableMapping() {New System.Data.Common.DataTableMapping("Table", "yonghu", New System.Data.Common.DataColumnMapping() {New System.Data.Common.DataColumnMapping("name", "name"), New System.Data.Common.DataColumnMapping("pass", "pass")})})
        Me.OleDbDataAdapter1.UpdateCommand = Me.OleDbUpdateCommand1
        '
        'OleDbDeleteCommand1
        '
        Me.OleDbDeleteCommand1.CommandText = "DELETE FROM yonghu WHERE (name = ?) AND (pass = ? OR ? IS NULL AND pass IS NULL)"
        Me.OleDbDeleteCommand1.Connection = Me.OleDbConnection1
        Me.OleDbDeleteCommand1.Parameters.Add(New System.Data.OleDb.OleDbParameter("Original_name", System.Data.OleDb.OleDbType.VarWChar, 50, System.Data.ParameterDirection.Input, False, CType(0, Byte), CType(0, Byte), "name", System.Data.DataRowVersion.Original, Nothing))
        Me.OleDbDeleteCommand1.Parameters.Add(New System.Data.OleDb.OleDbParameter("Original_pass", System.Data.OleDb.OleDbType.VarWChar, 50, System.Data.ParameterDirection.Input, False, CType(0, Byte), CType(0, Byte), "pass", System.Data.DataRowVersion.Original, Nothing))
        Me.OleDbDeleteCommand1.Parameters.Add(New System.Data.OleDb.OleDbParameter("Original_pass1", System.Data.OleDb.OleDbType.VarWChar, 50, System.Data.ParameterDirection.Input, False, CType(0, Byte), CType(0, Byte), "pass", System.Data.DataRowVersion.Original, Nothing))
        '
        'OleDbConnection1
        '
        Me.OleDbConnection1.ConnectionString = "Jet OLEDB:Global Partial Bulk Ops=2;Jet OLEDB:Registry Path=;Jet OLEDB:Database L" & _
        "ocking Mode=1;Data Source=""D:\yonghu.mdb"";Jet OLEDB:Engine Type=5;Provider=""Micr" & _
        "osoft.Jet.OLEDB.4.0"";Jet OLEDB:System database=;Jet OLEDB:SFP=False;persist secu" & _
        "rity info=False;Extended Properties=;Mode=Share Deny None;Jet OLEDB:Encrypt Data" & _
        "base=False;Jet OLEDB:Create System Database=False;Jet OLEDB:Don't Copy Locale on" & _
        " Compact=False;Jet OLEDB:Compact Without Replica Repair=False;User ID=Admin;Jet " & _
        "OLEDB:Global Bulk Transactions=1"
        '
        'OleDbInsertCommand1
        '
        Me.OleDbInsertCommand1.CommandText = "INSERT INTO yonghu(name, pass) VALUES (?, ?)"
        Me.OleDbInsertCommand1.Connection = Me.OleDbConnection1
        Me.OleDbInsertCommand1.Parameters.Add(New System.Data.OleDb.OleDbParameter("name", System.Data.OleDb.OleDbType.VarWChar, 50, "name"))
        Me.OleDbInsertCommand1.Parameters.Add(New System.Data.OleDb.OleDbParameter("pass", System.Data.OleDb.OleDbType.VarWChar, 50, "pass"))
        '
        'OleDbSelectCommand1
        '
        Me.OleDbSelectCommand1.CommandText = "SELECT name, pass FROM yonghu"
        Me.OleDbSelectCommand1.Connection = Me.OleDbConnection1
        '
        'OleDbUpdateCommand1
        '
        Me.OleDbUpdateCommand1.CommandText = "UPDATE yonghu SET name = ?, pass = ? WHERE (name = ?) AND (pass = ? OR ? IS NULL " & _
        "AND pass IS NULL)"
        Me.OleDbUpdateCommand1.Connection = Me.OleDbConnection1
        Me.OleDbUpdateCommand1.Parameters.Add(New System.Data.OleDb.OleDbParameter("name", System.Data.OleDb.OleDbType.VarWChar, 50, "name"))
        Me.OleDbUpdateCommand1.Parameters.Add(New System.Data.OleDb.OleDbParameter("pass", System.Data.OleDb.OleDbType.VarWChar, 50, "pass"))
        Me.OleDbUpdateCommand1.Parameters.Add(New System.Data.OleDb.OleDbParameter("Original_name", System.Data.OleDb.OleDbType.VarWChar, 50, System.Data.ParameterDirection.Input, False, CType(0, Byte), CType(0, Byte), "name", System.Data.DataRowVersion.Original, Nothing))
        Me.OleDbUpdateCommand1.Parameters.Add(New System.Data.OleDb.OleDbParameter("Original_pass", System.Data.OleDb.OleDbType.VarWChar, 50, System.Data.ParameterDirection.Input, False, CType(0, Byte), CType(0, Byte), "pass", System.Data.DataRowVersion.Original, Nothing))
        Me.OleDbUpdateCommand1.Parameters.Add(New System.Data.OleDb.OleDbParameter("Original_pass1", System.Data.OleDb.OleDbType.VarWChar, 50, System.Data.ParameterDirection.Input, False, CType(0, Byte), CType(0, Byte), "pass", System.Data.DataRowVersion.Original, Nothing))
        '
        'DataSet11
        '
        Me.DataSet11.DataSetName = "DataSet1"
        Me.DataSet11.Locale = New System.Globalization.CultureInfo("zh-CN")
        '
        'Form1
        '
        Me.AcceptButton = Me.Button1
        Me.AutoScaleBaseSize = New System.Drawing.Size(6, 14)
        Me.ClientSize = New System.Drawing.Size(504, 413)
        Me.Controls.Add(Me.Button2)
        Me.Controls.Add(Me.Button1)
        Me.Controls.Add(Me.TextBox2)
        Me.Controls.Add(Me.Label2)
        Me.Controls.Add(Me.TextBox1)
        Me.Controls.Add(Me.Label1)
        Me.MaximizeBox = False
        Me.Name = "Form1"
        Me.StartPosition = System.Windows.Forms.FormStartPosition.CenterScreen
        Me.Text = "Form1"
        CType(Me.DataSet11, System.ComponentModel.ISupportInitialize).EndInit()
        Me.ResumeLayout(False)

    End Sub

#End Region

    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        If TextBox1.Text = "" Then
            MessageBox.Show("用户名不能为空")
            Exit Sub
        End If
        If TextBox2.Text = "" Then
            MessageBox.Show("密码不能为空")
            Exit Sub
        End If
        Dim b As Boolean = False
        OleDbDataAdapter1.SelectCommand.CommandText = "select * from yonghu"
        Dim cmd As New OleDb.OleDbCommand(OleDbDataAdapter1.SelectCommand.CommandText, OleDbConnection1)
        OleDbConnection1.Open()
        Dim dr As OleDb.OleDbDataReader
        dr = cmd.ExecuteReader
        While dr.Read
            If dr.GetValue(0) = TextBox1.Text And dr.GetValue(1) = TextBox2.Text Then
                b = True
            End If
        End While

        If b = True Then
            Dim f2 As New Form2
            Me.Hide()
            f2.ShowDialog()
        Else
            MessageBox.Show("登陆失败")
        End If
        OleDbConnection1.Close()
    End Sub

    Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
        Dim f3 As New Form3
        Me.Hide()
        f3.ShowDialog()
    End Sub


End Class