dotnet ef migrations add 201904191634 --configuration "APP DEBUG" //生成数据库歉意
dotnet ef database update --configuration "APP DEBUG" //更新数据库
dotnet ef migrations remove --configuration "APP DEBUG" //删除迁移文件
dotnet ef migrations script -o 20190419.sql --configuration "APP DEBUG" //到处sql文件
dotnet ef migrations script 201904181659 -o 20190419.sql --configuration "APP DEBUG" //按照迁移文件导出
