>+ 实例演练ASP+XML编程(三)

王朝asp·作者佚名 2006-01-09

四、操作Xml数据的Cls_Person类说明（clsPerson.asp）

Cls_Person类用来完成与联系人信息相关的各种操作，包括添加、修改和删除等等，它使用VBScript编写。Cls_Person包括Id、Name、Nick、Mobile、Tel、Email、QQ和Company属性，对应于XML文件中的Person节点。Cls_Person包括GetInfoFromXml、AddToXml、EditToXml和DeleteFormXml四个主要方法，分别完成获取信息，添加信息，修改信息和删除信息四个功能。

Cls_Person的具体实现如下，

'***************************************************

' 说明：Person类

' 作者：gwd 2002-11-06

' 引用：pub/constpub.asp

'***************************************************

Class Cls_Person

Private m_intId ' Id，对应Person节点在Persons集合中的位置

Private m_strName ' 姓名

Private m_strNick ' 英文名

Private m_strMobile ' 手机

Private m_strTel ' 电话

Private m_strEmail ' 电子邮件

Private m_strQQ ' QQ号

Private m_strCompany ' 所在公司

Private m_strError ' 出错信息

' 类初始化

Private Sub Class_Initialize()

m_strError = ""

m_intId = -1

End Sub

' 类释放

Private Sub Class_Terminate()

m_strError = ""

End Sub

'-----读写各个属性---------------------------

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

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

' 获取错误信息

Public Function GetLastError()

GetLastError = m_strError

End Function

' 私有方法，添加错误信息

Private Sub AddErr(strEcho)

m_strError = m_strError + "＜Div CLASS=""alert""＞" & strEcho & "＜/Div＞"

End Sub

' 清除错误信息

Public Function ClearError()

m_strError = ""

End Function

' 从Xml中读取指定节点的数据，并填充各个属性

' 需要首先设置Id

Public Function GetInfoFromXml(objXmlDoc)

Dim objNodeList

Dim I

ClearError

If objXmlDoc Is Nothing Then

GetInfoFromXml = False

AddErr "Dom对象为空值"

Exit Function

End If

If CStr(m_intId) = "-1" Then

GetInfoFromXml = False

AddErr "未正确设置联系人对象的ID属性"

Exit Function

Else

I = m_intId - 1 ' 要读取得节点位置

End If

' 选择并读取节点信息，赋予各个属性

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 "获取联系信息发生错误"

Set objNodeList = Nothing

Exit Function

End If

Set objNodeList = Nothing

End Function

' 添加信息到XML文件中

' 需要首先设置好要填充的属性

Public Function AddToXml(objXmlDoc)

Dim objPerson, objNode

ClearError

If objXmlDoc Is Nothing Then

AddToXml = False

AddErr "Dom对象为空值"

Exit Function

End If

' 创建Person节点

Set objPerson = objXmlDoc.createElement("Person")

objXmlDoc.documentElement.appendChild objPerson

' 创建各个子节点

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

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

' 从XML文件中删除数据

' 需要首先设置Id

Public Function DeleteFromXml(objXmlDoc)

Dim objNodeList, objNode

ClearError

If objXmlDoc Is Nothing Then

DeleteFromXml = False

AddErr "Dom对象为空值"

Exit Function

End If

If CStr(m_intId) = "-1" Then

DeleteFromXml = False

AddErr "未正确设置联系人对象的ID属性"

Exit Function

End If

Set objNodeList = objXmlDoc.getElementsByTagName("Person")

If objNodeList.length - m_intId ＜ 0 Then

DeleteFromXml = False

AddErr "未找到相应的联系人"

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 "删除联系人失败"

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文件中的数据

' 需要首先设置好Id

Public Function EditToXml(objXmlDoc)

Dim objPersonList, objOldPerson, objNewPerson, objNode

ClearError

If objXmlDoc Is Nothing Then

EditToXml = False

AddErr "Dom对象为空值"

Exit Function

End If

If CStr(m_intId) = "-1" Then

EditToXml = False

AddErr "未正确设置联系人对象的ID属性"

Exit Function

End If

Set objPersonList = objXmlDoc.getElementsByTagName("Person")

If objPersonList.length - m_intId ＜ 0 Then

DeleteFromXml = False

AddErr "未找到相应的联系人"

Set objPersonList = Nothing

Exit Function

End If

Set objOldPerson = objPersonList(m_intId-1) ' 要修改的旧节点

Set objNewPerson = objXmlDoc.createElement("Person") ' 用来替换旧节点的新节点

Set objNode = objXmlDoc.createElement("Name")

objNode.Text = m_strName