XML::LibXML 替换元素值 [英] XML::LibXML replace element value

问题描述

我想替换 xml 文件中元素的VAL1"值

I want to replace a "VAL1" value of an element in xml file

出于某种原因，它对我不起作用:

For some reason it does not work for me:

   <testing>
<application_name>TEST</application_name>
<application_id>VAL1</application_id>
<application_password>1234</application_password>
   </testing>

my $parser =XML::LibXML->new();
$tree   =$parser->parse_file($xml);
$root   =$tree->getDocumentElement;
my ($elem)=$root->findnodes('/testing/application_id');
$elem->setValue('VAL2');    

错误是无法通过包XML::LibXML::Element..."找到对象方法setValue"

The errror is get is "Can't locate object method "setValue" via package "XML::LibXML::Element..."

推荐答案

你从哪里得到 setValue 的?没有 XML::LibXML 对象有这样的方法.

Where did you get setValue from? No XML::LibXML object has such a method.

此外，一个元素没有值，所以你绝对不能设置它.

Furthermore, an element doesn't have a value, so you definitely cannot set it.

"VAL1" 是元素的子节点的值，一个 文本节点.

"VAL1" is the value of the the element's child node, a text node.

my ($application_id_text) = $root->findnodes('/testing/application_id/text()');
$application_id_text->setData('VAL2');

不幸的是，这并不完全安全.如果元素有多个文本子节点怎么办?如果它根本没有呢?

Unfortunately, that's not completely safe. What if the element has multiple text child nodes? What if it doesn't have any at all?

更安全的方法是获取元素，删除其所有作为文本节点的子节点(可以通过删除其所有子节点轻松完成)，然后添加具有所需值的新文本节点.

The safer way is to grab the element, delete all of its children that are text nodes (which can easily done by removing all of its child nodes), and add a new text node with the desired value.

my ($application_id_node) = $root->findnodes('/testing/application_id');
$application_id_node->removeChildNodes();
$application_id_node->appendText('VAL2');

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