实体框架核心更新-数据库特定的迁移没有权限错误

Question

I have created a migration earlier and applied to the database. I have had the table in the SQL Server database. Then I delete the table using SQL Server. So the table is not in the database anymore.

After that, I wanted to re-apply the same migrations using dotnet ef database update AddScreens . AddScreens is the name of the migration.

However, running this throws the following error:

Cannot find the object "Screens" because it does not exist or you do not have permissions

I am trying to add Screens table to the SQL Server again using CLI. I have tried to create a new migration but this time it gave me a blank migration. Any help will be appreciated!

Answer 1

Have you checked the table __MigrationHistory ?

Every Migration you apply is recorded inside this table. If you have inserted the table with update database eg. the record is inside there and Entity Framework does try to find the table.

You can also check at first for the Migrations:

Get-Migrations

If you would want to revert a recent migration

Update-Database -TargetMigration:"<name>"

is the way to go. I think currently your database schema and EF is missmatched.

You could manually restore the table and check if the database is ok again or re-create the whole schema (but this way you loese the data).

Sadly I do not know how to check with PMC the schema, by code it is:

if(context.Database.CompatibleWithModel(true))
..