Logging/Debugging (EF CORE)
===========================
Once you configure logging on a DbContext instance it will be enabled on all instances of that DbContext type
    using var context = new MyContext();
	context.ConfigureLogging(s => System.Diagnostics.Debug.WriteLine(s)); // write to Visual Studio "Output" tab
    //context.ConfigureLogging(s => Console.WriteLine(s));
see comments at top of file:
    Dinah.EntityFrameworkCore\DbContextLoggingExtensions.cs

LocalDb
=======
SSMS db connection: (LocalDb)\MSSQLLocalDB
eg: Server=(localdb)\mssqllocaldb;Database=DataLayer.LibationContext;Integrated Security=true;
LocalDb database files live at:
  C:\Users\[user]\DataLayer.LibationContext.mdf
  C:\Users\[user]\DataLayer.LibationContext_log.ldf

Migrations
==========

Visual Studio, EF Core 2.0
--------------------------
View > Other Windows > Package Manager Console
Default project: DataLayer
Startup project: DataLayer
since we have mult contexts, must use -context:

        Add-Migration MyComment -context LibationContext
		Update-Database -context LibationContext


QUICK VIEW
==========
declare @productId nvarchar(450) = 'B075Y4SWJ8'
  declare @bookId int
  declare @catId int
  select @bookId = b.BookId from Books b where b.AudibleProductId = @productId
  select @catId = b.CategoryId from Books b where b.AudibleProductId = @productId
select * from Books b where b.AudibleProductId = @productId
select *
  from BookContributor bc
  join Contributors c on bc.ContributorId = c.ContributorId
  where bc.BookId = @bookId order by role, [order]
select *
  from SeriesBook sb
  join Series s on sb.SeriesId = s.SeriesId
  where sb.BookId = @bookId
select *
  from Categories c1
  left join Categories c2 on c1.ParentCategoryCategoryId = c2.CategoryId
  where c1.CategoryId = @catId


ERROR
=====
Add-Migration : The term 'Add-Migration' is not recognized as the name of a cmdlet, function, script file, or operable program

SOLUTION
--------
dependencies > manage nuget packages
add: Microsoft.EntityFrameworkCore.Tools


SQLite
======
SQLite does not support all migrations (schema changes) due to limitations in SQLite
delete db before running Update-Database?