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I have a few XML files containing data for a research project which I need to run some statistics on. The amount of data is close to 100GB.
The structure is not so complex (could be mapped to perhaps 10 tables in a relational model), and given the nature of the problem, this data will never be updated again, I only need it available in a place where it's easy to run queries on.
I've read about XML databases, and the possibility of running XPATH-style queries on it, but I never used them and I'm not so comfortable with it. Having the data in a relational database would be my preferred choice.
So, I'm looking for a way to covert the data stored in XML into a relational database (think of a big .sql file similar to the one generated by mysqldump, but anything else would do).
The ultimate goal is to be able to run SQL queries for crunching the data.
After some research I'm almost convinced I have to write it on my own. But I feel this is a common problem, and therefore there should be a tool which already does that.
So, do you know of any tool that would transform XML data into a relational database?
PS1:
My idea would be something like (it can work differently, but just to make sure you get my point):
PS2:
I've seen some posts here in SO but still I couldn't find a solution. Microsoft's "Xml Bulk Load" tool seems to do something in that direction, but I don't have a MS SQL Server.
645
You can create a join view based on the XML file to converts the hierarchical XML data to a relational structure. You can then use the join view as a table in a single-table constraint or table pair. To create the join view, you create a self join based on the XML file.
Loading XML file: We will use simplexml_load_file() function to convert the well-formed XML document into the given file to an object.
In order to store an XML document in a relational database, the tree structure of the XML document must first be mapped into an equivalent, flat, and relational schema XML documents are then shredded and loaded into the mapped tables.
Databases are not the only way to search data. I can highly recommend Apache Solr
Keep your raw data as XML and search it using the Solr index
70
Importing XML files of the right format into a MySql database is easy:
https://dev.mysql.com/doc/refman/5.6/en/load-xml.html
This means, you typically have to transform your XML data into that kind of format. How you do this depends on the complexity of the transformation, what programming languages you know, and if you want to use XSLT (which is most probably a good idea).
From your former answers it seems you know Python, so http://xmlsoft.org/XSLT/python.html may be the right thing for you to start with.
23
Take a look at StAX instead of XSD for analyzing/extraction of data. It's stream based and can deal with huge XML files.
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