Question

I got XML items.xml file with (almost) the same values as my items table has, I mean fe. there is a field in the items table: level and for any id the level is set to 144, but in the XML file, the level= attribute is set to "1" (for the same id) – what is the best way to correct values like this?

It should go like this:

• Check value level in the database table for any id.
• If the level value from the database is other than the level="" attribute for this ID, set it to the same level value as in the
  database.

It can be kinda hard, since there is about ~40000 records to check.

I will appreciate some examples also!

Answer 1

Depending on what programming-language you are using, find the corresponding StAX-implementation. For Java I would go with XMLStreamReader (JavaDocs) and XMLStreamWriter (JavaDocs). You should find some tutorials on the internet.

When you encounter the START_ELEMENT event while reading the XML, check the tag’s name (getLocalName()). If you are on the correct tag, check for the attributes, i.e. using the getAttribute...()-methods and handle the writing differently.

Along all of this, use an XMLStreamWriter to write your new XML to some OutputStream. After all, just write the OutputStream to whereever you wish (File, etc.).

Don’t forget to read your Input-XML using a BufferedInputStream (or some other buffered way).

Good luck!

P.S.: You can also use XMLEventReader or XMLEventWriter, but personally I prefer XMLStreamReader / XMLStreamWriter. Also, you could use different StAX-Implementations like Woodstox.

P.P.S.: For PHP use XMLReader and XMLWriter. See here.