在 VBScript 中遍历和过滤 xml 节点

Question

如何从下面的 xml 中获取每个客户的公司、名字、姓氏、手机、电子邮件、国家、城市和邮政编码值？我尝试了以下代码，但是当缺少某些值（例如第一条记录中的电子邮件）时，代码会从下一条记录中分配值，因此“ABCars”得到“gwood@gmail.com”。

另外，你知道如何过滤加载的记录，以便只剩下另一个记录集中不存在手机号码的记录（记录集不包含在下面的代码中）？

Set xmlDoc = CreateObject("Msxml2.DOMDocument")
xmlDoc.async="false"
xmlDoc.setProperty "SelectionLanguage", "XPath"
xmlDoc.load("test.xml")

set  nodes=xmlDoc.SelectNodes("//customer")
for i=0 to nodes.length-1
set company=xmlDoc.SelectNodes("//customer/company")
set firstname=xmlDoc.SelectNodes("//customer/firstname")
set lastname=xmlDoc.SelectNodes("//customer/lastname")
set mobile=xmlDoc.SelectNodes("//customer/mobile")
set email=xmlDoc.SelectNodes("//customer/email")
set country=xmlDoc.SelectNodes("//customer/address/country")
set city=xmlDoc.SelectNodes("//customer/address/city")
set zipcode=xmlDoc.SelectNodes("//customer/address/zipcode")

XML：

<?xml version="1.0" encoding="UTF-8"?>
<list>
    <category>Cars</category>
    <customers>
        <customer>
            <company>ABCars</company>
            <firstname>Peter</firstname>
            <lastname>Heinrich</lastname>
            <mobile>9141453027</mobile>
            <address>
                <country>Germany</country>
                <city>Berlin</city>
                <zipcode>12345</zipcode>
            </address>
        </customer>
        <customer>
            <company>Best Cars</company>
            <firstname>George</firstname>
            <lastname>Wood</lastname>
            <mobile>123456789</mobile>
            <email>gwood@gmail.com</email>
            <address>
                <country>Great Britain</country>
                <city>Leicaster</city>
                <zipcode>67890</zipcode>
            </address>
        </customer>
    </customers>
</list>

问候， 普热梅克

Answer 1

您的循环通过nodes 集合，但循环主体查询每次迭代的整个文档，因此您每次都在执行相同的查询 - 使用返回的节点作为上下文节点来选择相对于该节点的节点：

set  nodes=xmlDoc.SelectNodes("//customer")
for i=0 to nodes.length-1
    ' get the current node
    set node = nodes(i)
    ' run xpath relative to the current node
    set company = node.selectSingleNode("company")
    set firstname = node.selectSingleNode("firstname")
    set lastname = node.selectSingleNode("lastname")
    set mobile = node.selectSingleNode("mobile")
    set email = node.selectSingleNode("email")
    set country = node.selectSingleNode("address/country")
    set city = node.selectSingleNode("address/city")
    set zipcode = node.selectSingleNode("address/zipcode")

next

如果 XPath 查询没有找到节点，将返回Nothing，您可以检查并适当路由：

set company = node.selectSingleNode("company")
if company is Nothing then
    ' do something if no company, eg break loop
    exit for
end if

对于过滤，您可以构建您的 XPath 查询以仅选择那些不在该列表中的节点，例如

dim xpath: xpath = Empty

do until recordset.EOF
    if xpath <> "" then
       xpath = xpath & " and "
    end if 
    xpath = xpath & "mobile != '" & recordset("mobile") & "'"

    recordset.MoveNext
loop

if xpath <> "" then
    xpath = "[" & xpath & "]"
end if

' eg you end up with something like "//customer[mobile != 123456789 and mobile != 987654321]" 
set nodes = xmldoc.selectNodes("//customer" & xpath)