DatabaseManagerCli is a command line application you can use to import data from the XML dumps into MySQL.
You can download a binary from the downloads section or build it yourself.
Configuration
The configuration for DatabaseManagerCli is stored in a simple text filed named Config.txt. A sample configuration is available in Config.Example.txt. You can copy that file to Config.txt and edit the relevant portions - you should have a working connection to MySQL. If you only have some XMLs and not others, you can fill only those fields, but do not remove the lines from the config file - all lines should be present.
Importing data
Once you've setup your Config.txt, you can run DatabaseManagerCli without arguments to get a list of possible commands. Commands can be executed in bulk by simply passing all the actions you want to peform, for example
DatabaseManagerCli import-labels import-artists import-masters import-releases
Errors during import
By far the most frequent cause for failed imports in the middle of the operation is corrupt data. If you encounter an error during import (and not in the beginning or the end), please redownload the archive, extract it (preferably on a different storage device) and try again. If the issue persists, file an issue describing your exact configuration.