MySQL

DATABASE_URI format should be mysql://<user>:<pass>@<host>:<port>/<database>

Example:

DATABASE_URI=mysql://user:pass@localhost:3306/llana

MSSQL

DATABASE_URI format should be mssql://<user>:<pass>@<host>:<port>/<database>

Postgres

DATABASE_URI format should be postgresql://<user>:<pass>@<host>:<port>/<database>