问更新按钮未更新

EN

Private Sub cmdEdit_Click()
'check whether there exists data in list
If Not (Me.TableSub.Form.Recordset.EOF And Me.TableSub.Form.Recordset.BOF) Then
'Get data to text box control
With Me.TableSub.Form.Recordset
    Me.text_key = .Fields("KW")
    Me.txt_code = .Fields("Code")
    Me.combo_source = .Fields("Source")
    'Store id of student in tag of text id in case id is modified
    Me.txt_code.Tag = .Fields("Code")
    'Change caption of button add to Update
    Me.cmdAdd.Caption = "Update"
    'disable button edit
    Me.cmdEdit.Enabled = False
End With
End If
End Sub

Private Sub cmdAdd_Click()
'when we click on button Add there are two options
'1. For insert
'2. For Update
If Me.txt_code.Tag & "" = "" Then
    'this is for insert new
    'add data to table
    CurrentDb.Execute "INSERT INTO KWTable(KW, Source, Code) " & _
        " VALUES('" & Me.text_key & "','" & Me.combo_source & "','" & _
        Me.txt_code & "')"

Else
'otherwise (Tag of txtID store the id of student to be modified)
CurrentDb.Execute "UPDATE KWTable " & _
" SET KW='" & Me.text_key & "'" & _
", Code='" & Me.txt_code & "'" & _
", Source='" & Me.combo_source & "'" & _
" WHERE KW='" & Me.text_key & "'"
End If
'clear form
cmdClear_Click
'refresh data in list on form
TableSub.Form.Requery

End Sub