frmstaff.frm

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      rs_staff.MovePrevious
    '如果没有到记录首则显示该记录
    If Not rs_staff.BOF Then
      For i = 0 To 1
         Text1(i).Text = rs_staff.Fields(i)
      Next i
     '如果到记录首，则表格已经为空，置所有text框显示为空
    ElseIf rs_staff.BOF Then
      For i = 0 To 1
         Text1(i).Text = ""
      Next i
      cmdFirst.Enabled = False
      cmdPrev.Enabled = False
      cmdNext.Enabled = False
      cmdLast.Enabled = False
    End If
   '如果删除的不是首尾记录，则显示当前记录即可
   Else
      For i = 0 To 1
         Text1(i).Text = rs_staff.Fields(i)
      Next i
      End If
End Sub

Private Sub cmdEdit_Click()
 '设置除保存和取消按钮外的其他按钮不可用
   cmdAdd.Enabled = False
   cmdEdit.Enabled = False
   cmdDel.Enabled = False
   cmdSave.Enabled = True
   cmdCancel.Enabled = True
   cmdFirst.Enabled = False
   cmdPrev.Enabled = False
   cmdNext.Enabled = False
   cmdLast.Enabled = False
   'cmdQuery.Enabled = False
   '需要设置除主键之外的text框可写
    Text1(1).Enabled = True
   add = 0
End Sub

Private Sub cmdFirst_Click()
 '先移动rs_staff记录到第一条
   rs_staff.MoveFirst
   '同时需要设置相应按钮为不可用和不可用
   cmdPrev.Enabled = False
   cmdFirst.Enabled = False
   cmdNext.Enabled = True
   cmdLast.Enabled = True
   '如果已经是第一条记录，则提示用户
   If rs_staff.BOF = True Then
      MsgBox "对不起，已经是第一条记录了！", vbOKOnly + vbInformation, "注意"
      Exit Sub
   '如果不是，则个数据表的记录位置移到第一条记录，并且显示之
   Else
      For i = 0 To 1
         Text1(i).Text = rs_staff.Fields(i) ''
      Next i
   End If
End Sub

Private Sub cmdLast_Click()
 '移动rs_staff记录到最后一条
   rs_staff.MoveLast
   cmdFirst.Enabled = True
   cmdPrev.Enabled = True
   cmdNext.Enabled = False
   cmdLast.Enabled = False
    '如果已经是最后一条记录，则提示用户
   If rs_staff.EOF = True Then
      MsgBox "对不起，已经是最后一条记录了！", vbOKOnly + vbInformation, "注意"
      Exit Sub
   '如果不是最后一条，则个数据表的记录位置移到后一条记录，并且显示之
   Else
      For i = 0 To 1
         Text1(i).Text = rs_staff.Fields(i)
      Next i
   End If
End Sub

Private Sub cmdNext_Click()
 '先移动rs_staff记录到后一条
   rs_staff.MoveNext
   '设置前一条和第一条按钮可用
   cmdPrev.Enabled = True
   cmdFirst.Enabled = True
   '如果已经是最后一条记录，则提示用户
   If rs_staff.EOF = True Then
      MsgBox "对不起，已经是最后一条记录了！", vbOKOnly + vbInformation, "注意"
      '并且设置“后一条”和最后一条按钮不可用
      cmdNext.Enabled = False
      cmdLast.Enabled = False
      Exit Sub
   '如果不是，则个数据表的记录位置移到后一条记录，并且显示之
   Else
      For i = 0 To 1
         Text1(i).Text = rs_staff.Fields(i)
      Next i
   End If
End Sub

Private Sub cmdPrev_Click()
'先移动rs_staff记录到前一条
   rs_staff.MovePrevious
   '设置后一条和最后一条按钮可用
   cmdNext.Enabled = True
   cmdLast.Enabled = True
   '如果已经是第一条记录，则提示用户
   If rs_staff.BOF = True Then
      MsgBox "对不起，已经是第一条记录了！", vbOKOnly + vbInformation, "注意"
      '并且设置“前一条”和第一条按钮不可用
      cmdPrev.Enabled = False
      cmdFirst.Enabled = False
      Exit Sub
   '如果不是，则个数据表的记录位置移到前一条记录，并且显示之
   Else
      For i = 0 To 1
         Text1(i).Text = rs_staff.Fields(i)
      Next i
   End If
End Sub

Private Sub cmdQuery_Click()
   'frmQuerystaff.Show
End Sub

Private Sub cmdSave_Click()
   '检测数据是否完整
      If Text1(1).Text = "" Then
         MsgBox "员工姓名不可为空！", vbOKOnly + vbInformation, "注意"
         Text1(1).SetFocus
         Exit Sub
      End If
   
   '添加数据后保存
   If add = 1 Then
      'rs_staff.Open
      rs_staff.AddNew
      For i = 0 To 1
         rs_staff.Fields(i) = Text1(i).Text
      Next i
      '添加之后显示总共条数信息加 1
      Text2.Text = Val(Text2.Text) + 1
   '修改数据后的保存
   Else
      rs_staff.Update
   End If
   MsgBox "保存数据成功！", vbOKOnly + vbInformation, "祝贺"
   '保存后需要设置其他按钮可用，以及各个text框不可写
   cmdAdd.Enabled = True
   cmdEdit.Enabled = True
   cmdDel.Enabled = True
   cmdSave.Enabled = False
   cmdCancel.Enabled = False
   cmdFirst.Enabled = True
   cmdPrev.Enabled = True
   cmdNext.Enabled = True
   cmdLast.Enabled = True
   'cmdQuery.Enabled = True
   For i = 0 To 1
      Text1(i).Enabled = False
   Next i
End Sub

Private Sub Form_Activate()
   Dim X0 As Long
   Dim Y0 As Long
   '让窗体居中
   X0 = Screen.Width
   Y0 = Screen.Height
   X0 = (X0 - Me.Width) / 2
   Y0 = (Y0 - Me.Height) / 2
   Me.Move X0, Y0
   cmdSave.Enabled = False
   cmdCancel.Enabled = False
 '如果不是查询显示,则显示第一条记录
 If querystaff = False Then
   '在from_laod()方法中打开住户信息表
   '如果rs_count rs_staff 当前状态是打开的，则先关闭之
   If rs_count.State = adStateOpen Then
      rs_count.Close
   End If
   If rs_staff.State = adStateOpen Then
      rs_staff.Close
   End If
   sqlstaff = "select * from staff"
   rs_staff.CursorLocation = adUseClient
   rs_staff.Open sqlstaff, conn, adOpenStatic, adLockOptimistic
   
   If rs_staff.EOF Then
      Text2.Text = 0
      '没有记录，则提示用户，退出本过程
      MsgBox "当前表中没有记录！", vbOKOnly + vbInformation, "注意"
      '如果是0条记录，需要设置前翻后翻的按钮为不可用
      cmdFirst.Enabled = False
      cmdPrev.Enabled = False
      cmdNext.Enabled = False
      cmdLast.Enabled = False
      cmdDel.Enabled = False
      cmdEdit.Enabled = False
      cmdSave.Enabled = False
      Exit Sub
   Else
      '如果有记录，需要设置前翻后翻的按钮为可用
      cmdFirst.Enabled = True
      cmdPrev.Enabled = True
      cmdNext.Enabled = True
      cmdLast.Enabled = True
      cmdDel.Enabled = True
      cmdEdit.Enabled = True
      cmdSave.Enabled = True
      '计算总共数据条数
      sqlcount = "select count(*) from staff"
      rs_count.Open sqlcount, conn, adOpenStatic, adLockOptimistic
      '有记录则，显示第一条，并且显示记录条数
      Text2.Text = rs_count.Fields(0)
      If Not rs_staff.EOF And Not rs_staff.BOF Then
         'For i = 0 To 1
            Text1(0).Text = rs_staff.Fields(0)
            Text1(1).Text = rs_staff.Fields(1)
         'Next i
      End If
   End If
       
 '如果是查询显示则相应sql语句为查询语句
 ElseIf querystaff = True Then
   '因为开始显示时必定打开了rs_staff,rs_count,所以应该先关闭它们
   rs_staff.Close
   rs_count.Close
   sqlstaff = "select * from staff " & sqlqh
      rs_staff.CursorLocation = adUseClient
      rs_staff.Open sqlstaff, conn, adOpenStatic, adLockOptimistic
   If rs_staff.EOF Then
      Text2.Text = 0
      '如果没有找到记录，则提示用户，置空所有text控件，并且退出本子过程
      MsgBox "没有找到符合条件的记录", vbOKOnly + vbInformation, "注意"
      For i = 0 To 1
         Text1(i).Text = ""
      Next i
      '如果是0条记录，需要设置前翻后翻的按钮为不可用
      cmdFirst.Enabled = False
      cmdPrev.Enabled = False
      cmdNext.Enabled = False
      cmdLast.Enabled = False
      cmdDel.Enabled = False
      cmdEdit.Enabled = False
      cmdSave.Enabled = False
      Exit Sub
   '找到符合条件的记录
   Else
      '如果有记录，需要设置前翻后翻的按钮为可用
      cmdFirst.Enabled = True
      cmdPrev.Enabled = True
      cmdNext.Enabled = True
      cmdLast.Enabled = True
      cmdDel.Enabled = True
      cmdEdit.Enabled = True
      cmdSave.Enabled = True
      '计算找到的条数
      sqlcount = "select count(*) from staff " & sqlqh
      rs_count.Open sqlcount, conn, adOpenStatic, adLockOptimistic
      Text2.Text = rs_count.Fields(0)
      '找到符合条件的记录，显示之
      For i = 0 To 1
         Text1(i).Text = rs_staff.Fields(i)
      Next i
  
   End If
         
 End If
   '设置各个text框不可写
   For i = 0 To 1
      Text1(i).Enabled = False
   Next i
End Sub

Private Sub Form_Unload(Cancel As Integer)
   If rs_staff.State = adStateOpen Then
      rs_staff.Close
   End If
   If rs_count.State = adStateOpen Then
      rs_count.Close
   End If
   '关闭时还需要设置querystaff为false
   querystaff = False
End Sub