Parameter for prisma init to supply connection string to be used in datasource

[janpio]

Problem

Right now we need to tell people to use prisma init and then open and edit prisma/.env to add their connection string: https://twitter.com/nikolasburk/status/1265617985986801664

This is cumbersome, especially if you just want people to get to a working Introspection as quickly as possible.

Suggested solution

We could add a param --database (or --connection-string or --url or similar) that takes and validates the connection string, extracts the provider (mysql:// => mysql etc) and persists both in the newly generated schema.prisma and .env automatically.

Alternatives

We keep the manual workflow that tells people to edit the file.

[timsuchanek]

This is now implemented with --url.