使用 PowerShell 将新节点插入 XML [英] Inserting a new node into XML with PowerShell

问题描述

我有一个 XML 模式，我正在尝试将新节点插入其中:

I have an XML schema that I'm trying to insert new nodes into:

<clusters>
  <cluster>
    <name>
      cfcluster
    </name>
    <port>
      45564
    </port>
    <sessionreplication>
      true
    </sessionreplication>
    <server>
      cfusion1
    </server>
    <server>
      cfusion2
    </server>
    <stickysession>
      true
    </stickysession>
  </cluster>
</clusters>

我正在尝试编写一个具有新 sever 值的脚本，将根据现有值对其进行检查，如果找不到，则在现有值之后插入新值.比如说我有一个新的服务器值 cfusion3，我希望我的新输出像这样结束:

I'm trying to write a script that has a new sever value, will check it against existing ones, then insert the new one after existing ones if it isn't found. Say for example I have a new server value cfusion3, I'd want my new output to end up like this:

<clusters>
  <cluster>
    <name>
      cfcluster
    </name>
    <port>
      45564
    </port>
    <sessionreplication>
      true
    </sessionreplication>
    <server>
      cfusion1
    </server>
    <server>
      cfusion2
    </server>
    <server>
      cfusion3
    </server>
    <stickysession>
      true
    </stickysession>
  </cluster>
</clusters>

假设我将 xml 存储在 $clusterData 中并且我要插入的新服务器存储在 $cfInstance.name 中，我想我会使用这样的东西，但无法让它工作......

Assuming I have the xml stored in $clusterData and the new server I want to insert is stored in $cfInstance.name, I was thinking I'd use something like this, but can't get it working...

if (-not ($clusterData.clusters.cluster.server -match $cfInstance.name)) {
    $oldServer = ($clusterData | Select-Xml '/clusters/cluster/server').get_node()
    $newServer = $clusterData.CreateElement("server")
    $newServer.InnerText = $cfInstance.name
    $clusterData.InsertAfter($newServer, $oldServer)
}

我很确定问题在于 $oldServer 正在获取所有 <server> 节点，但我不确定如何修改 xpath 得到一个.我试过:
Select-Xml -Xml $clusterData -XPath "clusters/cluster/server[text()='cfusion2']"
但这不会返回任何内容.有什么建议吗?

I'm pretty sure the problem is that $oldServer is getting all <server> nodes and I'm not sure how to modify the xpath to get just one. I've tried:
Select-Xml -Xml $clusterData -XPath "clusters/cluster/server[text()='cfusion2']"
but that doesn't return anything. Any suggestions?

推荐答案

使用以下 XPath 返回仅最后一个现有的 server 元素:

Use the following XPath to return only the last existing server element :

/clusters/cluster/server[last()]

/clusters/cluster/server[text()='cfusion2'] 可能不起作用，因为相应 server 元素的内部文本不完全正确等于 "cfusion2".有您没有考虑的空白.在进行比较之前尝试使用 normalize-space() 清理不必要的空格，如下所示:

/clusters/cluster/server[text()='cfusion2'] didn't work possibly because the inner text of the corresponding server element isn't exactly equals to "cfusion2". There are white-spaces that you didn't consider. Try using normalize-space() to clean up unnecessary white-spaces before doing comparison, like so :

/clusters/cluster/server[normalize-space()='cfusion2']

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