FlexLabs.EntityFrameworkCore.Upsert (nuget): Adds basic support for "Upsert" operations to EF Core.  Uses `INSERT … ON CONFLICT DO UPDATE` in PostgreSQL/Sqlite, `MERGE` in SqlServer and `INSERT INTO … ON DUPLICATE KEY UPDATE` in MySQL.  Also supports injecting sql command generators to add support for other providers
Keywords: Entity|Framework|Core|entity-framework-core|EF|EntityFramework|EntityFrameworkCore|EFCore|Upsert