PowerShell
Lavorare con i file XML
Ricerca…
Accesso a un file XML
<!-- file.xml -->
<people>
<person id="101">
<name>Jon Lajoie</name>
<age>22</age>
</person>
<person id="102">
<name>Lord Gaben</name>
<age>65</age>
</person>
<person id="103">
<name>Gordon Freeman</name>
<age>29</age>
</person>
</people>
Caricamento di un file XML
Per caricare un file XML, puoi utilizzare uno di questi:
# First Method
$xdoc = New-Object System.Xml.XmlDocument
$file = Resolve-Path(".\file.xml")
$xdoc.load($file)
# Second Method
[xml] $xdoc = Get-Content ".\file.xml"
# Third Method
$xdoc = [xml] (Get-Content ".\file.xml")
Accesso a XML come oggetti
PS C:\> $xml = [xml](Get-Content file.xml)
PS C:\> $xml
PS C:\> $xml.people
person
--------
{Jon Lajoie, Lord Gaben, Gordon Freeman}
PS C:\> $xml.people.person
id name age
-- ---- ---
101 Jon Lajoie 22
102 Lord Gaben 65
103 Gordon Freeman 29
PS C:\> $xml.people.person[0].name
Jon Lajoie
PS C:\> $xml.people.person[1].age
65
PS C:\> $xml.people.person[2].id
103
Accesso a XML con XPath
PS C:\> $xml = [xml](Get-Content file.xml)
PS C:\> $xml
PS C:\> $xml.SelectNodes("//people")
person
--------
{Jon Lajoie, Lord Gaben, Gordon Freeman}
PS C:\> $xml.SelectNodes("//people//person")
id name age
-- ---- ---
101 Jon Lajoie 22
102 Lord Gaben 65
103 Gordon Freeman 29
PS C:\> $xml.SelectSingleNode("people//person[1]//name")
Jon Lajoie
PS C:\> $xml.SelectSingleNode("people//person[2]//age")
65
PS C:\> $xml.SelectSingleNode("people//person[3]//@id")
103
Accesso a XML contenente spazi dei nomi con XPath
PS C:\> [xml]$xml = @"
<ns:people xmlns:ns="http://schemas.xmlsoap.org/soap/envelope/">
<ns:person id="101">
<ns:name>Jon Lajoie</ns:name>
</ns:person>
<ns:person id="102">
<ns:name>Lord Gaben</ns:name>
</ns:person>
<ns:person id="103">
<ns:name>Gordon Freeman</ns:name>
</ns:person>
</ns:people>
"@
PS C:\> $ns = new-object Xml.XmlNamespaceManager $xml.NameTable
PS C:\> $ns.AddNamespace("ns", $xml.DocumentElement.NamespaceURI)
PS C:\> $xml.SelectNodes("//ns:people/ns:person", $ns)
id name
-- ----
101 Jon Lajoie
102 Lord Gaben
103 Gordon Freeman
Creare un documento XML usando XmlWriter ()
# Set The Formatting
$xmlsettings = New-Object System.Xml.XmlWriterSettings
$xmlsettings.Indent = $true
$xmlsettings.IndentChars = " "
# Set the File Name Create The Document
$XmlWriter = [System.XML.XmlWriter]::Create("C:\YourXML.xml", $xmlsettings)
# Write the XML Decleration and set the XSL
$xmlWriter.WriteStartDocument()
$xmlWriter.WriteProcessingInstruction("xml-stylesheet", "type='text/xsl' href='style.xsl'")
# Start the Root Element
$xmlWriter.WriteStartElement("Root")
$xmlWriter.WriteStartElement("Object") # <-- Start <Object>
$xmlWriter.WriteElementString("Property1","Value 1")
$xmlWriter.WriteElementString("Property2","Value 2")
$xmlWriter.WriteStartElement("SubObject") # <-- Start <SubObject>
$xmlWriter.WriteElementString("Property3","Value 3")
$xmlWriter.WriteEndElement() # <-- End <SubObject>
$xmlWriter.WriteEndElement() # <-- End <Object>
$xmlWriter.WriteEndElement() # <-- End <Root>
# End, Finalize and close the XML Document
$xmlWriter.WriteEndDocument()
$xmlWriter.Flush()
$xmlWriter.Close()
File XML di output
<?xml version="1.0" encoding="utf-8"?>
<?xml-stylesheet type='text/xsl' href='style.xsl'?>
<Root>
<Object>
<Property1>Value 1</Property1>
<Property2>Value 2</Property2>
<SubObject>
<Property3>Value 3</Property3>
</SubObject>
</Object>
</Root>
Aggiunta di snippits di XML a XMLDocument corrente
Dati di esempio
Documento XML
Per prima cosa, definiamo un documento XML di esempio denominato " books.xml " nella nostra directory corrente:
<?xml version="1.0" encoding="UTF-8"?>
<books>
<book>
<title>Of Mice And Men</title>
<author>John Steinbeck</author>
<pageCount>187</pageCount>
<publishers>
<publisher>
<isbn>978-88-58702-15-4</isbn>
<name>Pascal Covici</name>
<year>1937</year>
<binding>Hardcover</binding>
<first>true</first>
</publisher>
<publisher>
<isbn>978-05-82461-46-8</isbn>
<name>Longman</name>
<year>2009</year>
<binding>Hardcover</binding>
</publisher>
</publishers>
<characters>
<character name="Lennie Small" />
<character name="Curley's Wife" />
<character name="George Milton" />
<character name="Curley" />
</characters>
<film>True</film>
</book>
<book>
<title>The Hunt for Red October</title>
<author>Tom Clancy</author>
<pageCount>387</pageCount>
<publishers>
<publisher>
<isbn>978-08-70212-85-7</isbn>
<name>Naval Institute Press</name>
<year>1984</year>
<binding>Hardcover</binding>
<first>true</first>
</publisher>
<publisher>
<isbn>978-04-25083-83-3</isbn>
<name>Berkley</name>
<year>1986</year>
<binding>Paperback</binding>
</publisher>
<publisher>
<isbn>978-08-08587-35-4</isbn>
<name>Penguin Putnam</name>
<year>2010</year>
<binding>Paperback</binding>
</publisher>
</publishers>
<characters>
<character name="Marko Alexadrovich Ramius" />
<character name="Jack Ryan" />
<character name="Admiral Greer" />
<character name="Bart Mancuso" />
<character name="Vasily Borodin" />
</characters>
<film>True</film>
</book>
</books>
Nuovi dati
Quello che vogliamo fare è aggiungere alcuni nuovi libri a questo documento, diciamo Patriot Games di Tom Clancy (sì, sono un fan delle opere di Clancy ^ __ ^) e un favorito della Fantascienza: la Guida galattica per gli autostoppisti di Douglas Adams principalmente perché Zaphod Beeblebrox è semplicemente divertente da leggere.
In qualche modo abbiamo acquisito i dati per i nuovi libri e li abbiamo salvati come elenco di oggetti personalizzati PSC:
$newBooks = @(
[PSCustomObject] @{
"Title" = "Patriot Games";
"Author" = "Tom Clancy";
"PageCount" = 540;
"Publishers" = @(
[PSCustomObject] @{
"ISBN" = "978-0-39-913241-4";
"Year" = "1987";
"First" = $True;
"Name" = "Putnam";
"Binding" = "Hardcover";
}
);
"Characters" = @(
"Jack Ryan", "Prince of Wales", "Princess of Wales",
"Robby Jackson", "Cathy Ryan", "Sean Patrick Miller"
);
"film" = $True;
},
[PSCustomObject] @{
"Title" = "The Hitchhiker's Guide to the Galaxy";
"Author" = "Douglas Adams";
"PageCount" = 216;
"Publishers" = @(
[PSCustomObject] @{
"ISBN" = "978-0-33-025864-7";
"Year" = "1979";
"First" = $True;
"Name" = "Pan Books";
"Binding" = "Hardcover";
}
);
"Characters" = @(
"Arthur Dent", "Marvin", "Zaphod Beeblebrox", "Ford Prefect",
"Trillian", "Slartibartfast", "Dirk Gently"
);
"film" = $True;
}
);
Modelli
Ora dobbiamo definire alcune strutture XML scheletro per i nostri nuovi dati. Fondamentalmente, vuoi creare uno scheletro / modello per ogni lista di dati. Nel nostro esempio, ciò significa che abbiamo bisogno di un modello per il libro, i personaggi e gli editori. Possiamo anche usarlo per definire alcuni valori predefiniti, come il valore per il tag film .
$t_book = [xml] @'
<book>
<title />
<author />
<pageCount />
<publishers />
<characters />
<film>False</film>
</book>
'@;
$t_publisher = [xml] @'
<publisher>
<isbn/>
<name/>
<year/>
<binding/>
<first>false</first>
</publisher>
'@;
$t_character = [xml] @'
<character name="" />
'@;
Abbiamo finito con il set-up.
Aggiungere i nuovi dati
Ora che siamo tutti configurati con i nostri dati di esempio, aggiungiamo gli oggetti personalizzati all'oggetto documento XML.
# Read the xml document
$xml = [xml] Get-Content .\books.xml;
# Let's show a list of titles to see what we've got currently:
$xml.books.book | Select Title, Author, @{N="ISBN";E={If ( $_.Publishers.Publisher.Count ) { $_.Publishers.publisher[0].ISBN} Else { $_.Publishers.publisher.isbn}}};;
# Outputs:
# title author ISBN
# ----- ------ ----
# Of Mice And Men John Steinbeck 978-88-58702-15-4
# The Hunt for Red October Tom Clancy 978-08-70212-85-7
# Let's show our new books as well:
$newBooks | Select Title, Author, @{N="ISBN";E={$_.Publishers[0].ISBN}};
# Outputs:
# Title Author ISBN
# ----- ------ ----
# Patriot Games Tom Clancy 978-0-39-913241-4
# The Hitchhiker's Guide to the Galaxy Douglas Adams 978-0-33-025864-7
# Now to merge the two:
ForEach ( $book in $newBooks ) {
$root = $xml.SelectSingleNode("/books");
# Add the template for a book as a new node to the root element
[void]$root.AppendChild($xml.ImportNode($t_book.book, $true));
# Select the new child element
$newElement = $root.SelectSingleNode("book[last()]");
# Update the parameters of that new element to match our current new book data
$newElement.title = [String]$book.Title;
$newElement.author = [String]$book.Author;
$newElement.pageCount = [String]$book.PageCount;
$newElement.film = [String]$book.Film;
# Iterate through the properties that are Children of our new Element:
ForEach ( $publisher in $book.Publishers ) {
# Create the new child publisher element
# Note the use of "SelectSingleNode" here, this allows the use of the "AppendChild" method as it returns
# a XmlElement type object instead of the $Null data that is currently stored in that leaf of the
# XML document tree
[void]$newElement.SelectSingleNode("publishers").AppendChild($xml.ImportNode($t_publisher.publisher, $true));
# Update the attribute and text values of our new XML Element to match our new data
$newPublisherElement = $newElement.SelectSingleNode("publishers/publisher[last()]");
$newPublisherElement.year = [String]$publisher.Year;
$newPublisherElement.name = [String]$publisher.Name;
$newPublisherElement.binding = [String]$publisher.Binding;
$newPublisherElement.isbn = [String]$publisher.ISBN;
If ( $publisher.first ) {
$newPublisherElement.first = "True";
}
}
ForEach ( $character in $book.Characters ) {
# Select the characters xml element
$charactersElement = $newElement.SelectSingleNode("characters");
# Add a new character child element
[void]$charactersElement.AppendChild($xml.ImportNode($t_character.character, $true));
# Select the new characters/character element
$characterElement = $charactersElement.SelectSingleNode("character[last()]");
# Update the attribute and text values to match our new data
$characterElement.name = [String]$character;
}
}
# Check out the new XML:
$xml.books.book | Select Title, Author, @{N="ISBN";E={If ( $_.Publishers.Publisher.Count ) { $_.Publishers.publisher[0].ISBN} Else { $_.Publishers.publisher.isbn}}};
# Outputs:
# title author ISBN
# ----- ------ ----
# Of Mice And Men John Steinbeck 978-88-58702-15-4
# The Hunt for Red October Tom Clancy 978-08-70212-85-7
# Patriot Games Tom Clancy 978-0-39-913241-4
# The Hitchhiker's Guide to the Galaxy Douglas Adams 978-0-33-025864-7
Ora possiamo scrivere il nostro XML su disco, schermo, web o ovunque!
Profitto
Anche se questa potrebbe non essere la procedura per chiunque, l'ho trovata utile per evitare un sacco di [void]$xml.SelectSingleNode("/complicated/xpath/goes[here]").AppendChild($xml.CreateElement("newElementName") seguito da $xml.SelectSingleNode("/complicated/xpath/goes/here/newElementName") = $textValue
Penso che il metodo descritto nell'esempio sia più pulito e più facile da analizzare per gli umani normali.
miglioramenti
Potrebbe essere possibile cambiare il modello per includere elementi con i bambini invece di scomporre ogni sezione come modello separato. Devi solo fare attenzione a clonare l'elemento precedente quando passi in rassegna l'elenco.
Modified text is an extract of the original Stack Overflow Documentation
Autorizzato sotto CC BY-SA 3.0
Non affiliato con Stack Overflow