Question

我使用Powershell安装SSIS项目并为其创建环境。我正在从Project.Params XML文件中读取项目参数，以创建环境变量＆amp;他们的价值观我可以使用以下代码片段来读取参数＆amp;它们的值，但我想使用SelectSingleNode而不是第二个foreach循环。我的XPath技能不符合它。这是工作代码：

# load the Params file into memory
[xml]$ParamsDoc = Get-Content -Path $ParamsFilePath

# for each parameter in the Params file, add an environment variable if it doesn't already exist
foreach ($Param in $ParamsDoc.Parameters.Parameter)
{
    $ParamName = $Param.Name

    # use the value in the Params file as the default value for the environment variable
    foreach ($Prop in $Param.Properties.Property)
    {
        if ($Prop.Name -eq 'value')
        {
            $ParamValue = $Prop.InnerText
            break
        }
    }
    AddEnvironmentVariableIfMissing $ParamName $ParamValue
}

AddEnvironmentVariableIfMissing是我编写的一个单独的函数。现在，这里的代码不起作用：

# load the Params file into memory
[xml]$ParamsDoc = Get-Content $ParamsFilePath

$nsMgr = New-Object System.Xml.XmlNamespaceManager($ParamsDoc.NameTable)
$nsMgr.AddNamespace("SSIS", $ParamsDoc.DocumentElement.NamespaceURI)

foreach ($Param in $ParamsDoc.Parameters.Parameter)
{
    $ParamName = $Param.Name

    # NONE of these work!
    $ParamValue = $Param.Properties.SelectSingleNode("SSIS:Property[@Name='Value']",$nsMgr)
    $ParamValue = $Param.Properties.SelectSingleNode("Name[.='Value']",$nsMgr)
    $ParamValue = $Param.Properties.SelectSingleNode("SSIS:Property/Name[.='Value']",$nsMgr)
    $ParamValue = $Param.Properties.Property.SelectSingleNode("Name[.='Value']",$nsMgr)
    $ParamValue = $Param.SelectSingleNode("SSIS:Properties/SSIS:Property[@Name='Value']",$nsMgr)
    $ParamValue = $Param.SelectSingleNode("SSIS:Properties/SSIS:Property/Name[.='Value']",$nsMgr)
    $ParamValue = $Param.SelectSingleNode("SSIS:Property[@Name='Value']",$nsMgr)
    $ParamValue = $Param.SelectSingleNode("SSIS:Property/Name[.='Value']",$nsMgr)

    AddEnvironmentVariableIfMissing $ParamName $ParamValue
}

使用Name =＆＃39; Value＆＃39;来获取子节点的正确XPath语法是什么？

这是SSIS Project.params文件的样本

<?xml version="1.0"?>
<SSIS:Parameters xmlns:SSIS="www.microsoft.com/SqlServer/SSIS">
  <SSIS:Parameter
    SSIS:Name="Client">
    <SSIS:Properties>
      <SSIS:Property
        SSIS:Name="ID">{144b0266-9e94-4821-bb68-f020436d5df5}</SSIS:Property>
      <SSIS:Property
        SSIS:Name="CreationName"></SSIS:Property>
      <SSIS:Property
        SSIS:Name="Description"></SSIS:Property>
      <SSIS:Property
        SSIS:Name="IncludeInDebugDump">0</SSIS:Property>
      <SSIS:Property
        SSIS:Name="Required">0</SSIS:Property>
      <SSIS:Property
        SSIS:Name="Sensitive">0</SSIS:Property>
      <SSIS:Property
        SSIS:Name="Value">sampleclient</SSIS:Property>
      <SSIS:Property
        SSIS:Name="DataType">18</SSIS:Property>
    </SSIS:Properties>
  </SSIS:Parameter>
  <SSIS:Parameter
    SSIS:Name="MSSQLServer">
    <SSIS:Properties>
      <SSIS:Property
        SSIS:Name="ID">{b4e6c5e1-ef85-4df3-b2dc-db37971d081d}</SSIS:Property>
      <SSIS:Property
        SSIS:Name="CreationName"></SSIS:Property>
      <SSIS:Property
        SSIS:Name="Description"></SSIS:Property>
      <SSIS:Property
        SSIS:Name="IncludeInDebugDump">0</SSIS:Property>
      <SSIS:Property
        SSIS:Name="Required">0</SSIS:Property>
      <SSIS:Property
        SSIS:Name="Sensitive">0</SSIS:Property>
      <SSIS:Property
        SSIS:Name="Value">MSSQLSERVER</SSIS:Property>
      <SSIS:Property
        SSIS:Name="DataType">18</SSIS:Property>
    </SSIS:Properties>
  </SSIS:Parameter>
</SSIS:Parameters>

Answer 1

所以PetSerAI有正确的想法。命名空间需要采用XPath语法，包括Name元素。有效的两个语法是：

    $ParamValue = $Param.Properties.SelectSingleNode("SSIS:Property[@SSIS:Name='Value']",$nsMgr)
    $ParamValue = $Param.SelectSingleNode("SSIS:Properties/SSIS:Property[@SSIS:Name='Value']",$nsMgr)

谢谢你，PetSerAI！

子节点上的Powershell SelectSingleNode

1 个答案: