Detailed explanation of the steps for php to parse xml and generate sql statements

This time I will bring you a detailed explanation of the steps for php to parse xml and generate sql statements. What are the precautions for php to parse xml and generate sql statements. The following is a practical case, let's take a look.

There are many ways for PHP to parse XML. There are a lot of them in the documentation. Just search for them.

I encountered a requirement today: extract the node attributes from a certain xml, and then update the fields in a certain table of the database.

Idea:

Parse the XML and get all the node attributes-> Loop the node collection and get the corresponding attributes-> Splice the sql string and store it in an array –> Convert the array to a string and save it in a file

Xpath is used here. Two problems were encountered during the process of writing the code:

1. The historical path of xml The file cannot be loaded when the attribute is D:\xx\..., just change it to "/" (the delimiter under Linux)

2. Get the attributes of a node, use ::attributes, and the editor will There are constant red prompts. I found the document for a long time, and finally used ->getAttribute() (I guess, because it is too strange, it supports ->previousSibling and ->nodeValue). According to the DOMElement:: on the document getAttribute reported an error directly..

The following is the sample code:

<title>xml 转换为 sql</title>
<meta http-equiv=&#39;content-type&#39; content=&#39;text/html; charset=utf-8&#39; />
<style type="text/css">
  .tip_info {margin-bottom:10px;}
  .tip_info span {color:#f00;}
</style>
<?php
$xml = "D:/res/dressConfig.xml";
$doc = new DOMDocument();
$doc->load($xml);
$xpath = new DOMXPath($doc);
$query = "//i";
$entries = $xpath->query($query);
$len = $entries->length;
echo "<p class=&#39;tip_info&#39;>总共找到：<span>".$len."</span>个节点</p>";
$arr = array();
$idx = 0;
while ($idx < $len) {
  $nodeItem = $entries->item($idx);
  $id = $nodeItem->getAttribute("i");
  $name = $nodeItem->getAttribute("n");
  $inf = $nodeItem->getAttribute("inf");
//  echo "<p>".$id.'--'.$name.'--'.$inf."</p>";
  $idx++;
  array_push($arr, "update dress_item t SET t.s_name='".$name."',t.s_intro='".$inf."' WHERE t.n_doid=".$id.";");
}
$dir = "d:/sql/";
if (!is_dir($dir)) {
  mkdir($dir);
}
file_put_contents("d:/sql/dress_item.sql", implode("\n\r", $arr));
echo "生成完毕！";
?>

Because the data is generated from the database table, the number of nodes found That is the total number of records in the table. After generation, you can take a look to see if the content is correct, and then execute the sql script to achieve the purpose.

I believe you have mastered the method after reading the case in this article. For more exciting information, please pay attention to other related articles on the php Chinese website!

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