frmtitles.frm

学生选课系统

      Width           =   1815
   End
   Begin VB.Label lblLabels 
      Caption         =   "书籍名:"
      Height          =   255
      Index           =   1
      Left            =   120
      TabIndex        =   2
      Top             =   380
      Width           =   1815
   End
   Begin VB.Label lblLabels 
      Caption         =   "书籍编号:"
      Height          =   255
      Index           =   0
      Left            =   120
      TabIndex        =   0
      Top             =   60
      Width           =   1815
   End
End
Attribute VB_Name = "frmTitles"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
Dim WithEvents adoprimaryrs As Recordset
Attribute adoprimaryrs.VB_VarHelpID = -1
Dim mbChangedByCode As Boolean
Dim mvBookMark As Variant
Dim mbEditFlag As Boolean
Dim mbAddNewFlag As Boolean
Dim mbDataChanged As Boolean

Private Sub cmdSearch_Click()
    txtSearch = UCase(Trim(txtSearch))
    adoprimaryrs.MoveFirst
    adoprimaryrs.Find (comSearch.Text & "='" & txtSearch & "'")
    If adoprimaryrs.AbsolutePosition < 0 Then
        MsgBox comSearch & " 没找到!!!", vbInformation, "注意"
        adoprimaryrs.MoveFirst
    End If
End Sub

Private Sub DCombo_Click(Area As Integer)
    txtFields(3).Text = DCombo.Text
End Sub

Private Sub Form_Load()
    Dim db As Connection
    Set db = New Connection
    db.CursorLocation = adUseClient
    db.Open strConnection

    Set adoprimaryrs = New Recordset
    adoprimaryrs.Open "select TitleId,Title,Author,Subject,Quantity,AddOn,Price from Titles", db, adOpenStatic, adLockOptimistic

    Dim oText As TextBox
    '将Textbox绑定到数据集上
    For Each oText In Me.txtFields
        Set oText.DataSource = adoprimaryrs
    Next

    mbDataChanged = False
  
    Set adoprimaryrs2 = New Recordset
    adoprimaryrs2.Open "select Subject from Subjects ", db, adOpenStatic, adLockOptimistic
  
    Set DCombo.DataSource = adoprimaryrs2
    Set DCombo.RowSource = adoprimaryrs2
    DCombo.ListField = "Subject"
        
    comSearch.AddItem "Title"
    comSearch.AddItem "Author"
    comSearch.ListIndex = 0
    
End Sub

Private Sub Form_Unload(Cancel As Integer)
    Screen.MousePointer = vbDefault
End Sub

Private Sub adoPrimaryRS_MoveComplete(ByVal adReason As ADODB.EventReasonEnum, ByVal pError As ADODB.Error, adStatus As ADODB.EventStatusEnum, ByVal pRecordset As ADODB.Recordset)
    '显示当前记录位置
    lblStatus.Caption = "记录: " & CStr(adoprimaryrs.AbsolutePosition)
End Sub

Private Sub adoPrimaryRS_WillChangeRecord(ByVal adReason As ADODB.EventReasonEnum, ByVal cRecords As Long, adStatus As ADODB.EventStatusEnum, ByVal pRecordset As ADODB.Recordset)
    '这里是放置验证代码的地方
    '下面这些事件激发此事件发生
    Dim bCancel As Boolean
    
    Select Case adReason
        Case adRsnAddNew
        Case adRsnClose
        Case adRsnDelete
        Case adRsnFirstChange
        Case adRsnMove
        Case adRsnRequery
        Case adRsnResynch
        Case adRsnUndoAddNew
        Case adRsnUndoDelete
        Case adRsnUndoUpdate
        Case adRsnUpdate
    End Select
    
    If bCancel Then adStatus = adStatusCancel
End Sub

Private Sub cmdAdd_Click()
    On Error GoTo AddErr
    With adoprimaryrs
        If Not (.BOF And .EOF) Then
            mvBookMark = .Bookmark
        End If
            .AddNew
            lblStatus.Caption = "添加记录"
            mbAddNewFlag = True
            SetButtons False
    End With
    
    Exit Sub
AddErr:
    MsgBox "发生错误：" & Err.Description, vbExclamation, "错误"
End Sub

Private Sub cmdDelete_Click()
    On Error GoTo DeleteErr
    With adoprimaryrs
        .Delete
        .MoveNext
        If .EOF Then .MoveLast
    End With
    Exit Sub
DeleteErr:
  MsgBox Err.Description
End Sub

Private Sub cmdRefresh_Click()
    '多用户情况下才需要使用
    On Error GoTo RefreshErr
    Set grdDataGrid.DataSource = Nothing
    adoprimaryrs.Requery
    Set grdDataGrid.DataSource = adoprimaryrs("ChildCMD").UnderlyingValue
    Exit Sub
RefreshErr:
    MsgBox "发生错误：" & Err.Description, vbExclamation, "错误"
End Sub

Private Sub cmdEdit_Click()
    On Error GoTo EditErr

    lblStatus.Caption = "Edit record"
    mbEditFlag = True
    SetButtons False
    Exit Sub

EditErr:
    MsgBox "发生错误：" & Err.Description, vbExclamation, "错误"
End Sub
Private Sub cmdCancel_Click()
    On Error Resume Next

    SetButtons True
    mbEditFlag = False
    mbAddNewFlag = False
    adoprimaryrs.CancelUpdate
    If mvBookMark > 0 Then
        adoprimaryrs.Bookmark = mvBookMark
    Else
        adoprimaryrs.MoveFirst
    End If
    mbDataChanged = False

End Sub

Private Sub cmdUpdate_Click()
    On Error GoTo UpdateErr

    adoprimaryrs.UpdateBatch adAffectAll

    If mbAddNewFlag Then
        '移动到新记录
        adoprimaryrs.MoveLast
        MsgBox "在这个书籍下已经有" & txtFields(4) & "本书, 请输入书本信息."
        M.BooksCallByTitle = True
        mbEditFlag = False
        mbAddNewFlag = False
        SetButtons True
        mbDataChanged = False
        frmBooks.Show
        Exit Sub
    End If

    mbEditFlag = False
    mbAddNewFlag = False
    SetButtons True
    mbDataChanged = False

    Exit Sub
UpdateErr:
    MsgBox "发生错误：" & Err.Description, vbExclamation, "错误"
End Sub

Private Sub cmdClose_Click()
    Unload Me
End Sub

Private Sub cmdFirst_Click()
    On Error GoTo GoFirstError
    adoprimaryrs.CancelUpdate
    adoprimaryrs.MoveFirst
    mbDataChanged = False
    Exit Sub

GoFirstError:
    MsgBox "发生错误：" & Err.Description, vbExclamation, "错误"
End Sub

Private Sub cmdLast_Click()
    On Error GoTo GoLastError
    adoprimaryrs.CancelUpdate
    adoprimaryrs.MoveLast
    mbDataChanged = False
    Exit Sub

GoLastError:
    MsgBox "发生错误：" & Err.Description, vbExclamation, "错误"
End Sub

Private Sub cmdNext_Click()
    On Error GoTo GoNextError
    adoprimaryrs.CancelUpdate

    If Not adoprimaryrs.EOF Then adoprimaryrs.MoveNext
    If adoprimaryrs.EOF And adoprimaryrs.RecordCount > 0 Then
        Beep
        '超出记录尾，需要恢复
        adoprimaryrs.MoveLast
    End If
    '显示当前记录
    mbDataChanged = False

    Exit Sub
GoNextError:
    MsgBox "发生错误：" & Err.Description, vbExclamation, "错误"
End Sub

Private Sub cmdPrevious_Click()
    On Error GoTo GoPrevError
    adoprimaryrs.CancelUpdate

    If Not adoprimaryrs.BOF Then adoprimaryrs.MovePrevious
    If adoprimaryrs.BOF And adoprimaryrs.RecordCount > 0 Then
        Beep
        '超出记录头，需要恢复
        adoprimaryrs.MoveFirst
    End If
    '显示当前记录
    mbDataChanged = False

    Exit Sub

GoPrevError:
    MsgBox "发生错误：" & Err.Description, vbExclamation, "错误"
End Sub

Private Sub SetButtons(bVal As Boolean)
    cmdAdd.Visible = bVal
    cmdEdit.Visible = bVal
    cmdUpdate.Visible = Not bVal
    cmdCancel.Visible = Not bVal
    cmdDelete.Visible = bVal
    cmdClose.Visible = bVal
    cmdRefresh.Visible = bVal
    cmdNext.Enabled = bVal
    cmdFirst.Enabled = bVal
    cmdLast.Enabled = bVal
    cmdPrevious.Enabled = bVal
    DCombo.Visible = Not bVal
    txtFields(3).Visible = bVal
End Sub

Private Sub txtFields_LostFocus(Index As Integer)

    txtFields(Index).Text = UCase(Trim(txtFields(Index).Text))

    If Index = 4 Or Index = 6 Then
        If Not IsNumeric(txtFields(Index).Text) Then
            MsgBox "请输入数字!!!", vbInformation, "注意"
            txtFields(Index).Text = ""
            txtFields(Index).SetFocus
        End If
    End If

End Sub