I do not want to use mysql or other databases

We really need more infomation on what it is you are trying to do. You did mention XML files.

• Are you trying to get info from xml files into a database?
• What database "are you using"/"have you experience with"?
• Are there more than one xml files, and you need to get the info from ALL of them into the database?
• Who controls the xml file/s?
• Do you only need to read the files into memory and then do something with the data later in your script?

As you can see there are loads of questions that still need to be answered before we can give you any really meaningful help.