frmstaus.vb

vb。net 2003数据库设计整套源代码

Public Class FrmStaus
    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

    '窗体重写处置以清理组件列表。
    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 ListView1 As System.Windows.Forms.ListView
    Friend WithEvents ColumnHeader1 As System.Windows.Forms.ColumnHeader
    Friend WithEvents ColumnHeader2 As System.Windows.Forms.ColumnHeader
    Friend WithEvents ColumnHeader3 As System.Windows.Forms.ColumnHeader
    Friend WithEvents BtCancel As System.Windows.Forms.Button
    Friend WithEvents LbStatus As System.Windows.Forms.Label
    <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
        Me.ListView1 = New System.Windows.Forms.ListView()
        Me.ColumnHeader1 = New System.Windows.Forms.ColumnHeader()
        Me.ColumnHeader2 = New System.Windows.Forms.ColumnHeader()
        Me.ColumnHeader3 = New System.Windows.Forms.ColumnHeader()
        Me.BtCancel = New System.Windows.Forms.Button()
        Me.LbStatus = New System.Windows.Forms.Label()
        Me.SuspendLayout()
        '
        'ListView1
        '
        Me.ListView1.Columns.AddRange(New System.Windows.Forms.ColumnHeader() {Me.ColumnHeader1, Me.ColumnHeader2, Me.ColumnHeader3})
        Me.ListView1.FullRowSelect = True
        Me.ListView1.Location = New System.Drawing.Point(16, 56)
        Me.ListView1.Name = "ListView1"
        Me.ListView1.Size = New System.Drawing.Size(456, 325)
        Me.ListView1.TabIndex = 7
        Me.ListView1.View = System.Windows.Forms.View.Details
        '
        'ColumnHeader1
        '
        Me.ColumnHeader1.Text = "编号"
        Me.ColumnHeader1.Width = 100
        '
        'ColumnHeader2
        '
        Me.ColumnHeader2.Text = "用户名"
        Me.ColumnHeader2.Width = 120
        '
        'ColumnHeader3
        '
        Me.ColumnHeader3.Text = "登录时间"
        Me.ColumnHeader3.Width = 300
        '
        'BtCancel
        '
        Me.BtCancel.Location = New System.Drawing.Point(376, 408)
        Me.BtCancel.Name = "BtCancel"
        Me.BtCancel.Size = New System.Drawing.Size(80, 32)
        Me.BtCancel.TabIndex = 8
        Me.BtCancel.Text = "取消"
        '
        'LbStatus
        '
        Me.LbStatus.Location = New System.Drawing.Point(16, 24)
        Me.LbStatus.Name = "LbStatus"
        Me.LbStatus.Size = New System.Drawing.Size(136, 24)
        Me.LbStatus.TabIndex = 9
        Me.LbStatus.Text = "当前无用户上机"
        '
        'FrmStaus
        '
        Me.AutoScaleBaseSize = New System.Drawing.Size(6, 14)
        Me.ClientSize = New System.Drawing.Size(488, 454)
        Me.Controls.AddRange(New System.Windows.Forms.Control() {Me.LbStatus, Me.BtCancel, Me.ListView1})
        Me.MaximizeBox = False
        Me.Name = "FrmStaus"
        Me.StartPosition = System.Windows.Forms.FormStartPosition.CenterParent
        Me.Text = "当前状态"
        Me.ResumeLayout(False)

    End Sub

#End Region
  
    Private Sub FrmStaus_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        Dim SQLString As String
        SQLString = "SELECT IDOrder,UserName,LoginTime FROM tbUser WHERE OnLine=1 "
        'SQL查询语句
        Dim ObjectdsDataSet As New DataSet()
        Dim oleconn As New OleDb.OleDbConnection(CONN)
        Dim adapter As New OleDb.OleDbDataAdapter()
        adapter.TableMappings.Add("Table", "Log")
        Dim cmd As OleDb.OleDbCommand = New OleDb.OleDbCommand(SQLString, oleconn)
        cmd.CommandType = CommandType.Text
        adapter.SelectCommand = cmd
        If oleconn.State <> ConnectionState.Open Then
            oleconn.Open()   '打开数据库连接
        End If
        cmd.ExecuteNonQuery() '执行SQL语句
        If oleconn.State <> ConnectionState.Closed Then
            oleconn.Close()    '关闭数据库连接
        End If
        adapter.Fill(ObjectdsDataSet) '填充数据集
        LbStatus.Text = "目前有" & ObjectdsDataSet.Tables("Log").Rows.Count.ToString & "正在使用计算机"
        '显示提示信息
        Dim oRow As DataRow
        Dim oTable As DataTable
        oTable = ObjectdsDataSet.Tables("Log")
        Dim litem As ListViewItem
        For Each oRow In oTable.Rows
            litem = New ListViewItem(oRow("IDOrder").ToString)
            litem.SubItems.Add(oRow("UserName").ToString)
            litem.SubItems.Add(oRow("LoginTime").ToString)
            Me.ListView1.Items.Add(litem)   '添加记录
        Next
    End Sub

    Private Sub BtCancel_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles BtCancel.Click
        Me.Close()
    End Sub
End Class