Question

我的record.xml看起来像：

<record>
    <name>john</name>
    <gender>male</gender>
    <subject>mathematics, english, science</subject>
</record>
<record>
    <name>jamie</name>
    <gender>female</gender>
    <subject>mathematics, science</subject>
</record>
<record>
    <name>jamie</name>
    <gender>female</gender>
    <subject>social-science, english</subject>
</record>

我想编写一个xpath查询，它将返回包含一个或多个给定主题的记录节点。

例如：

如果想获得主题数学和科学
的学生的记录

然后应该返回第二条记录，即

<record>
    <name>jamie</name>
    <gender>female</gender>
    <subject>mathematics, science</subject>
</record>

这就是我现在所做的：

<?php
        $xmldoc = new DOMDocument();
        $xmldoc->load('record.xml');

        $xpathvar = new Domxpath($xmldoc);

        $res = $xpathvar->query('//record/subject[. = "science"]');
        foreach($res as $data){
                echo $data->textContent.'<br>';
        }
?>

我想达到这样的结果：

<?php
        $xmldoc = new DOMDocument();
        $xmldoc->load('record.xml');

        $xpathvar = new Domxpath($xmldoc);

        $res = $xpathvar->query('//record/subject[. = "science" and mathematics]');
        foreach($res as $data){
                echo $data->textContent.'<br>';
        }
?>

Answer 1

除非你可以将主题分成他们自己的节点，否则实际上不会有很好的方法来实现这一点。

/r/record[contains(subject,"science") and contains(subject,"mathematics") and ...  ]

没有什么可以确定单词的分割位置，所以如果你有一个主题，比如说“计算机科学”那么你就会受到误击。你会更好，你可以将主题文本分成单独的元素。

 <record>
   <name>jamie</name>
   <gender>female</gender>
   <subject>mathematics</subject>
   <subject>science</subject>
</record>

xpath =  /r/record[subject[.="science" and .="mathematics" ... and ...] ]

或者像这样使用某种形式的分词分隔符：

 <record>
   <name>jamie</name>
   <gender>female</gender>
   <subject>|mathematics|science|</subject>
</record>

xpath = /r/record[contains(subject,"|science|") and contains(subject,"|mathematics|") and ...  ]

PHP XPath Query获取包含多个子字符串的节点

1 个答案: