.(dot) character is not being accepted in database name

Strictly speaking, dot character in database names might not be supported by all database engines and versions. Indeed it is supported in latest mySQL/MariaDB, but it was not like that before: https://dev.mysql.com/doc/refman/8.0/en/...fiers.html

Also, dot character is used in fully qualified names (my_db.my_table.my_column), that should be quoted separately: `my_db`.`my_table`.`my_column`. This is exactly wha CI4 is doing when finds a dot in DB config: treats it as a qualifier separator, and quotes parts before and after it separately.

Interesting thought, that database name in mySQL does not have a qualifier - this is covered in docs, https://dev.mysql.com/doc/refman/8.0/en/...fiers.html

However, in other DB engines (e.g. MS SQL, Oracle come to my mind) situation might be different: my_server.my_db.my_schema for instance.

So we could change it for particular DB Driver, if it makes sense at all.