[6.x] Add dropAllViews functionality to the SQL Server builder

[mikeu]

Currently, trying to drop all views on a SQL Server database (e.g. with protected $dropViews = true; in your test case) throws a LogicException because the SQL Server builder does not override dropAllViews().

This PR adds that functionality, overriding dropAllViews() in Illuminate\Database\Schema\SqlServerBuilder.

[taylorotwell]

Can someone else that uses SQL Server confirm this?

[mikeu]

@taylorotwell I'm definitely all for having someone else confirm this, but wondering if there's anything I could do to make that easier/faster. A SQL fiddle showing the generated command running against SQL Server for example, or a sample repo with migrations that generate views, and a test that has $dropViews = true, maybe. Or is it just a matter of waiting for someone appropriate to see this at this point?

[taylorotwell]

A SQL fiddle would be nice if that is possible.

[mikeu]

Hopefully better late than never, here's a quick fiddle to demonstrate dropping an existing view with the generated command that's now been merged:

http://sqlfiddle.com/#!18/9a983/8

(With the final failure of course being expected, because the view has successfully been dropped.)