如何使用XML::Simple访问Perl中的嵌套XML结构中的深层数据?

I am using XML::Simple and I have the following XML structure in a variable $xmldata which I need to access through Perl code.

我正在使用XML::Simple，并且在变量$xmldata中具有以下XML结构，我需要通过Perl代码访问它。

<root>
    <a>sfghs</a>
    <b>agaga</b>
    <c>
       <c1>sgsfs</c1>
       <c2>sgsrsh</c2>
    </c>
    <d>
        <d1>agaga</d1>
        <d2>asgsg</d2>
    </d>
</root>

I can access the value of a and b by using the following code :

我可以使用以下代码访问a和b的值:

$aval = $xmldata->{a}[0];
$bval = $xmldata->{b}[0] ;

Now, my question is: how can I get the value of say, d2 ?

现在，我的问题是:我如何得到这个值，d2 ?

1 个解决方案

#1

Given what you have above, I assume that you have the ForceArray flag enabled. Nested keys are stored as hashes of hashes using references.

根据上面的内容，我假设您已经启用了ForceArray标志。使用引用将嵌套键存储为散列。

So, to access 'd2' you would need to use:

因此，要访问“d2”你需要使用:

my $d2val = $xmldata->{d}[0]->{d2}[0];

(or my preference)

(或我喜欢)

my $d2val = $xmldata->{d}->[0]->{d2}->[0];

(because it makes the deref obvious)

(因为它使真伪显而易见)

Obviously, the deeper you go the scarier this gets. That's one of the reasons I almost always suggest XML::LibXML and XPath instead of XML::Simple. XML::Simple rapidly becomes not simple. XML::Simple docs explain how various options can affect this layout.

显然，你越往深处走，它就越可怕。这就是我几乎总是建议使用XML::LibXML和XPath而不是XML::Simple的原因之一。XML:简单迅速变得不简单。XML:简单的文档解释了各种选项如何影响这个布局。

Data::Dumper is invaluable when you want to take a look at how the data are laid out.

数据:当你想要查看数据的布局时，Dumper是无价的。

#1