问题描述

我需要解析 40GB 大小的 XML 文件，然后进行规范化，然后插入到 MySQL 数据库中.我不清楚需要在数据库中存储多少文件，也不知道 XML 结构.

I need to parse XML files of 40GB in size, and then normalize, and insert to a MySQL database. How much of the file I need to store in the database is not clear, neither do I know the XML structure.

我应该使用哪个解析器，你会怎么做?

Which parser should I use, and how would you go about doing this?

推荐答案

在 PHP 中，您可以使用 XMLReader^文档:

In PHP, you can read in extreme large XML files with the XMLReader^Docs:

$reader = new XMLReader();
$reader->open($xmlfile);

超大型 XML 文件应以压缩格式存储在磁盘上.至少这是有道理的，因为 XML 文件具有很高的压缩率.例如像 large.xml.gz.

Extreme large XML files should be stored in a compressed format on disk. At least this makes sense as XML files have a high compression ratio. For example gzipped like large.xml.gz.

PHP 通过 压缩对 XMLReader 提供了很好的支持包装器^文档:

PHP supports that quite well with XMLReader via the compression wrappers^Docs:

$xmlfile = 'compress.zlib://path/to/large.xml.gz';

$reader = new XMLReader();
$reader->open($xmlfile);

XMLReader 允许您仅"对当前元素进行操作.这意味着它是仅向前的.如果您需要保持解析器状态，您需要自己构建它.

The XMLReader allows you to operate on the current element "only". That means it's forward-only. If you need to keep parser state, you need to build it your own.

我经常发现将基本动作封装到一组迭代器中很有帮助，这些迭代器知道如何对 XMLReader 进行操作，例如仅遍历元素或子元素.您可以在Parse XML with PHP and XMLReader中找到这一点.

I often find it helpful to wrap the basic movements into a set of iterators that know how to operate on XMLReader like iterating through elements or child-elements only. You find this outlined in Parse XML with PHP and XMLReader.

参见:

• PHP 打开 gzipped XML

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