* Use ID or Where to instead directly use Get when load object from database

* Apply suggestions from code review

Co-authored-by: 6543 <6543@obermui.de>

Co-authored-by: 6543 <6543@obermui.de>
Co-authored-by: zeripath <art27@cantab.net>

`show` is keyword in MySQL and has to be quoted to reference a column name. Use grave accents (ASCII code 96) for quoting to match rest of the source code. It's non-standard SQL, but it's supported by SQLite and MySQL.

Signed-off-by: Filip Navara <navara@emclient.com>