frmoldtests.frm

上机考试系统

VERSION 5.00
Begin VB.Form OldTests 
   BorderStyle     =   1  'Fixed Single
   Caption         =   "历届试题管理"
   ClientHeight    =   1905
   ClientLeft      =   45
   ClientTop       =   330
   ClientWidth     =   4455
   LinkTopic       =   "Form1"
   MaxButton       =   0   'False
   MDIChild        =   -1  'True
   MinButton       =   0   'False
   ScaleHeight     =   1905
   ScaleWidth      =   4455
   Begin VB.TextBox txtNum 
      Height          =   270
      Left            =   1635
      Locked          =   -1  'True
      MaxLength       =   8
      TabIndex        =   9
      Top             =   195
      Width           =   1995
   End
   Begin VB.TextBox txtName 
      Height          =   270
      Left            =   1620
      Locked          =   -1  'True
      MaxLength       =   20
      TabIndex        =   8
      Top             =   607
      Width           =   1995
   End
   Begin VB.PictureBox picNavigation 
      AutoSize        =   -1  'True
      BorderStyle     =   0  'None
      Height          =   360
      Left            =   885
      ScaleHeight     =   360
      ScaleWidth      =   2685
      TabIndex        =   6
      Top             =   1312
      Width           =   2685
      Begin VB.TextBox txtNews 
         Height          =   300
         Left            =   690
         Locked          =   -1  'True
         TabIndex        =   7
         TabStop         =   0   'False
         Top             =   15
         Width           =   1275
      End
      Begin VB.CommandButton cmdMove 
         Height          =   300
         Index           =   2
         Left            =   1950
         Picture         =   "frmOldTests.frx":0000
         Style           =   1  'Graphical
         TabIndex        =   4
         Top             =   15
         Width           =   345
      End
      Begin VB.CommandButton cmdMove 
         Height          =   300
         Index           =   3
         Left            =   2280
         Picture         =   "frmOldTests.frx":0044
         Style           =   1  'Graphical
         TabIndex        =   5
         Top             =   15
         Width           =   345
      End
      Begin VB.CommandButton cmdMove 
         Height          =   300
         Index           =   0
         Left            =   30
         Picture         =   "frmOldTests.frx":0093
         Style           =   1  'Graphical
         TabIndex        =   2
         Top             =   15
         Width           =   345
      End
      Begin VB.CommandButton cmdMove 
         Height          =   300
         Index           =   1
         Left            =   360
         Picture         =   "frmOldTests.frx":00E0
         Style           =   1  'Graphical
         TabIndex        =   3
         Top             =   15
         Width           =   345
      End
   End
   Begin VB.CommandButton cmdDelete 
      Caption         =   "删除"
      Height          =   300
      Left            =   1440
      TabIndex        =   0
      Top             =   997
      Width           =   735
   End
   Begin VB.CommandButton cmdExit 
      Cancel          =   -1  'True
      Caption         =   "退出"
      Height          =   315
      Left            =   2280
      TabIndex        =   1
      Top             =   990
      Width           =   735
   End
   Begin VB.Label Label1 
      AutoSize        =   -1  'True
      Caption         =   "试题编号"
      Height          =   180
      Left            =   825
      TabIndex        =   11
      Top             =   240
      Width           =   720
   End
   Begin VB.Label Label2 
      AutoSize        =   -1  'True
      Caption         =   "试题名称"
      Height          =   180
      Left            =   825
      TabIndex        =   10
      Top             =   652
      Width           =   720
   End
End
Attribute VB_Name = "OldTests"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
Option Explicit
Dim objOldTests As Recordset          '用于保存数据库中的历届试题记录
Dim objCn As Connection             '用于建立数据库联接

Private Sub cmdExit_Click()
    Unload Me                       '关闭历届试题管理窗体
End Sub

Private Sub Form_Load()
    '建立数据库联接
    Set objCn = New Connection                 '实例化联接对象
    With objCn                                 '建立数据库联接
        .Provider = "SQLOLEDB"
        .ConnectionString = "User ID=sa;PWD=123;Data Source=(local);" & _
                            "Initial Catalog=自测考试"
        .Open
    End With
    '获取历届试题记录
    Set objOldTests = New Recordset               '实例化objOldTests对象
    With objOldTests
        Set .ActiveConnection = objCn           '设置数据库联接
        .CursorLocation = adUseClient           '指定使用客户端游标
        .CursorType = adOpenStatic              '指定使用静态游标
        .LockType = adLockOptimistic
        .Open "SELECT * FROM 历届试题"          '获取历届试题记录
    End With
    '触发按钮单击事件，显示第一个记录
    cmdMove(0).Value = True
End Sub

Private Sub cmdMove_Click(Index As Integer)
    With objOldTests
        Select Case Index           '切换当前记录
            Case 0                  '使第一个记录成为当前记录
                If .RecordCount > 0 And Not .BOF Then .MoveFirst
            Case 1                  '使上一个记录成为当前记录
                If .RecordCount > 0 And Not .BOF Then
                    .MovePrevious
                    If .BOF Then .MoveFirst
                End If
            Case 2                  '使下一个记录成为当前记录
                If .RecordCount > 0 And Not .EOF Then
                    .MoveNext
                    If .EOF Then .MoveLast
                End If
            Case 3                  '使最后一个记录成为当前记录
                If .RecordCount > 0 And Not .EOF Then .MoveLast
        End Select
        If .RecordCount < 1 Then
            txtNews = "记录：无"    '显示无记录提示
            txtNum = ""
            txtName = ""
        Else
            '显示当前记录数据
            txtNum = .Fields("编号")
            txtName = .Fields("表名")
            '显示当前记录编号和记录总数
            txtNews = "记录：" & .AbsolutePosition & "/" & .RecordCount
        End If
    End With
End Sub


Private Sub cmdDelete_Click()
    Dim strSQL$
    '请求确认执行删除操作
    If objOldTests.RecordCount > 0 Then
    If MsgBox("是否删除当前记录？", vbYesNo + vbQuestion, "历届试题管理") = vbYes Then
        '执行删除当前记录操作
        strSQL = "DROP TABLE " & objOldTests.Fields("表名")
        objOldTests.Delete
        objCn.Execute strSQL
        '显示下一记录数据
        cmdMove(2).Value = True
    End If
    End If
End Sub

Private Sub Form_Unload(Cancel As Integer)
    objCn.Close                 '关闭数据联接
    Set objCn = Nothing         '释放数据库联接
    Set objOldTests = Nothing     '释放记录集对象
End Sub