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實例演練ASP+XML編程(3)

2019-11-18 20:06:39
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  四、操作xml數據的Cls_Person類說明(clsPerson.asp

Cls_Person類用來完成與聯系人信息相關的各種操作,包括添加、修改和刪除等等,它使用VBScript編寫。Cls_Person包括Id、Name、Nick、Mobile、Tel、Email、QQ和Company屬性,對應于XML文件中的Person節點。Cls_Person包括GetInfoFromXml、AddToXml、EditToXml和DeleteFormXml四個主要方法,分別完成獲取信息,添加信息,修改信息和刪除信息四個功能。

Cls_Person的具體實現如下,

'***************************************************
' 說明:Person類
' 作者:gwd 2002-11-06
' 引用:pub/constpub.asp
'***************************************************

Class Cls_Person

PRivate m_intId ' Id,對應Person節點在Persons集合中的位置
Private m_strName ' 姓名
Private m_strNick ' 英文名
Private m_strMobile ' 手機
Private m_strTel ' 電話
Private m_strEmail ' 電子郵件
Private m_strQQ ' QQ號
Private m_strCompany ' 所在公司
Private m_strError ' 出錯信息

' 類初始化
Private Sub Class_Initialize()
 m_strError = ""
 m_intId = -1
End Sub

' 類釋放
Private Sub Class_Terminate()
 m_strError = ""
End Sub

'-----讀寫各個屬性---------------------------

Public Property Get Id
 Id = m_intId
End Property

Public Property Let Id(intId)
 m_intId = intId
End Property

Public Property Get Name
Name = m_strName
End Property

Public Property Let Name(strName)
 m_strName = strName
End Property

Public Property Get Nick
 Nick = m_strNick
End Property

Public Property Let Nick(strNick)
 m_strNick = strNick
End Property

Public Property Get Mobile
 Mobile = m_strMobile
End Property

Public Property Let Mobile(strMobile)
 m_strMobile = strMobile
End Property

Public Property Get Tel
 Tel = m_strTel
End Property

Public Property Let Tel(strTel)
 m_strTel = strTel
End Property

Public Property Get Email
 Email = m_strEmail
End Property

Public Property Let Email(strEmail)
 m_strEmail = strEmail
End Property

Public Property Get QQ
 QQ = m_strQQ
End Property

Public Property Let QQ(strQQ)
 m_strQQ = strQQ
End Property

Public Property Get Company
 Company = m_strCompany
End Property

Public Property Let Company(strCompany)
 m_strCompany = strCompany
End Property

'-----------------------------------------------

' 獲取錯誤信息
Public Function GetLastError()
 GetLastError = m_strError
End Function

' 私有方法,添加錯誤信息
Private Sub AddErr(strEcho)
 m_strError = m_strError + "<Div CLASS=""alert"">" & strEcho & "</Div>"
End Sub

' 清除錯誤信息
Public Function ClearError()
 m_strError = ""
End Function

' 從Xml中讀取指定節點的數據,并填充各個屬性
' 需要首先設置Id
Public Function GetInfoFromXml(objXmlDoc)
 Dim objNodeList
 Dim I

 ClearError

 If objXmlDoc Is Nothing Then
  GetInfoFromXml = False
  AddErr "Dom對象為空值"
  Exit Function
 End If

 If CStr(m_intId) = "-1" Then
  GetInfoFromXml = False
  AddErr "未正確設置聯系人對象的ID屬性"
  Exit Function
 Else
  I = m_intId - 1 ' 要讀取得節點位置
 End If

 ' 選擇并讀取節點信息,賦予各個屬性
 Set objNodeList = objXmlDoc.getElementsByTagName("Person")
 If objNodeList.length - m_intId >= 0 Then
  On Error Resume Next
  m_strName = objNodeList(I).selectSingleNode("Name").Text
  m_strNick = objNodeList(I).selectSingleNode("Nick").Text
  m_strMobile = objNodeList(I).selectSingleNode("Mobile").Text
  m_strTel = objNodeList(I).selectSingleNode("Tel").Text
  m_strEmail = objNodeList(I).selectSingleNode("Email").Text
  m_strQQ = objNodeList(I).selectSingleNode("QQ").Text
  m_strCompany = objNodeList(I).selectSingleNode("Company").Text
  GetInfoFromXml = True
 Else
  GetInfoFromXml = False
  AddErr "獲取聯系信息發生錯誤"
  Set objNodeList = Nothing
  Exit Function
 End If
 Set objNodeList = Nothing
End Function

' 添加信息到XML文件中
' 需要首先設置好要填充的屬性
Public Function AddToXml(objXmlDoc)
 Dim objPerson, objNode

 ClearError

 If objXmlDoc Is Nothing Then
  AddToXml = False
  AddErr "Dom對象為空值"
  Exit Function
 End If

 ' 創建Person節點
 Set objPerson = objXmlDoc.createElement("Person")
 objXmlDoc.documentElement.appendChild objPerson

 ' 創建各個子節點
 '-----------------------------------------------------
 Set objNode = objXmlDoc.createElement("Name")
 objNode.Text = m_strName
 objPerson.appendChild objNode

 Set objNode = objXmlDoc.createElement("Nick")
 objNode.Text = m_strNick
 objPerson.appendChild objNode

 Set objNode = objXmlDoc.createElement("Mobile")
 objNode.Text = m_strMobile
 objPerson.appendChild objNode

 Set objNode = objXmlDoc.createElement("Tel")
 objNode.Text = m_strTel
 objPerson.appendChild objNode

 Set objNode = objXmlDoc.createElement("Email")
 objNode.Text = m_strEmail
 objPerson.appendChild objNode

 Set objNode = objXmlDoc.createElement("QQ")
 objNode.Text = m_strQQ
 objPerson.appendChild objNode

 Set objNode = objXmlDoc.createElement("Company")
 objNode.Text = m_strCompany
 objPerson.appendChild objNode
 '-----------------------------------------------------

 Set objNode = Nothing
 Set objPerson = Nothing

  On Error Resume Next
 objXmlDoc.save Server.MapPath(C_XMLFILE) '保存XML文件
 If Err.Number = 0 Then
  AddToXml = True
 Else
  AddToXml = False
  AddErr Err.Description
 End If
End Function

' 從XML文件中刪除數據
' 需要首先設置Id
Public Function DeleteFromXml(objXmlDoc)
 Dim objNodeList, objNode

 ClearError

 If objXmlDoc Is Nothing Then
  DeleteFromXml = False
  AddErr "Dom對象為空值"
  Exit Function
 End If

 If CStr(m_intId) = "-1" Then
  DeleteFromXml = False
  AddErr "未正確設置聯系人對象的ID屬性"
  Exit Function
 End If

 Set objNodeList = objXmlDoc.getElementsByTagName("Person")
 If objNodeList.length - m_intId < 0 Then
  DeleteFromXml = False
  AddErr "未找到相應的聯系人"
  Set objNodeList = Nothing
  Exit Function
 End If

 On Error Resume Next
 Set objNode = objXmlDoc.documentElement.removeChild(objNodeList(intId-1))
 If objNode Is Nothing Then
  DeleteFromXml = False
  AddErr "刪除聯系人失敗"
  Set objNodeList = Nothing
  Exit Function
 Else
  objXmlDoc.save Server.MapPath(C_XMLFILE)
 End If
 Set objNode = Nothing
 Set objNodeList = Nothing

 If Err.Number = 0 Then
  DeleteFromXml = True
 Else
  DeleteFromXml = False
  AddErr Err.Description
 End If
End Function

' 修改XML文件中的數據
' 需要首先設置好Id
Public Function EditToXml(objXmlDoc)
 Dim objPersonList, objOldPerson, objNewPerson, objNode

 ClearError

 If objXmlDoc Is Nothing Then
  EditToXml = False
  AddErr "Dom對象為空值"
  Exit Function
 End If

 If CStr(m_intId) = "-1" Then
  EditToXml = False
  AddErr "未正確設置聯系人對象的ID屬性"
  Exit Function
 End If

 Set objPersonList = objXmlDoc.getElementsByTagName("Person")
 If objPersonList.length - m_intId < 0 Then
  DeleteFromXml = False
  AddErr "未找到相應的聯系人"
  Set objPersonList = Nothing
  Exit Function
 End If

 Set objOldPerson = objPersonList(m_intId-1) ' 要修改的舊節點

 Set objNewPerson = objXmlDoc.createElement("Person") ' 用來替換舊節點的新節點
 Set objNode = objXmlDoc.createElement("Name")
 objNode.Text = m_strName
 objNewPerson.appendChild objNode

 Set objNode = objXmlDoc.createElement("Nick")
 objNode.Text = m_strNick
 objNewPerson.appendChild objNode

 Set objNode = objXmlDoc.createElement("Mobile")
 objNode.Text = m_strMobile
 objNewPerson.appendChild objNode

 Set objNode = objXmlDoc.createElement("Tel")
 objNode.Text = m_strTel
 objNewPerson.appendChild objNode

 Set objNode = objXmlDoc.createElement("Email")
 objNode.Text = m_strEmail
 objNewPerson.appendChild objNode

 Set objNode = objXmlDoc.createElement("QQ")
 objNode.Text = m_strQQ
 objNewPerson.appendChild objNode

 Set objNode = objXmlDoc.createElement("Company")
 objNode.Text = m_strCompany
 objNewPerson.appendChild objNode

 On Error Resume Next
 ' 進行替換
 Set objNode = objXmlDoc.documentElement.replaceChild(objNewPerson, objOldPerson)
 If objNode Is Nothing Then
 EditToXml = False
 AddErr "修改聯系人失敗"
 Set objOldPerosn = Nothing
 Set objNewPerson = Nothing
 Set objPersonList = Nothing
 Exit Function
Else
 objXmlDoc.save Server.MapPath(C_XMLFILE)
End If

Set objOldPerson = Nothing
Set objNewPerson = Nothing
Set objPersonList = Nothing

If Err.Number = 0 Then
 EditToXml = True
Else
 EditToXml = False
 AddErr Err.Description
End If
End Function

End Class


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