Description

Restructure create_db_report and clean java style code

How Has This Been Tested?

Manual check with the report output on browser

[x] My code follows the style guidelines of this project
[x] I have already squashed the commits and make the commit message conform to the project standard.
[ ] I have already marked the commit with "BREAKING CHANGE" or "Fixes #" if needed.
[x] I have performed a self-review of my own code
[ ] I have commented my code, particularly in hard-to-understand areas
[ ] I have made corresponding changes to the documentation
[x] My changes generate no new warnings
[ ] I have added tests that prove my fix is effective or that my feature works
[ ] New and existing unit tests pass locally with my changes
[ ] Any dependent changes have been merged and published in downstream modules