Home>Article>Backend Development> 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 theprecautionsfor 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:
xml 转换为 sql load($xml); $xpath = new DOMXPath($doc); $query = "//i"; $entries = $xpath->query($query); $len = $entries->length; echo "总共找到：".$len."个节点
"; $arr = array(); $idx = 0; while ($idx < $len) { $nodeItem = $entries->item($idx); $id = $nodeItem->getAttribute("i"); $name = $nodeItem->getAttribute("n"); $inf = $nodeItem->getAttribute("inf"); // echo "".$id.'--'.$name.'--'.$inf."
"; $idx++; array_push($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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