migrator | Migrate Redis data from source to destination | Database library

I am getting the following error when I execute dotnet ef database update command

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I am trying to add an sql statement to an up-method of a migration for my current project. The database is an Ms Access database. The migrations get applied during run-time. The situation is as follows: I have a base Initial-create migration, which in my case is assumed to be already applied. Due to the nature of this application we have a table A which contains some kind of a foreign key, but without any sql-constraints defined. This means the foreign-key relationship is designed via program code and not in sql means an foreign key relationship. The key is an string and if there is no foreign-element the value is empty. Now we want to add a new migration which enforces this relationship via sql-constraints. This works just fine via standard ef-core migration code, but the problem comes when the migration gets applied to a non empty database. The sql foreign key would need all the empty strings in table A to be null (otherwise we get an exception)

The seemingly easy solution was to add the following statement in the up-method of the new migration:

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I've an application which uses Entity Framework. It contains several migration files which do various database operations. Another user has been making updates directly to the database and now I can't get one of my migrations to apply when I run Update-Database. This is the error I get:

PM> Update-Database Build started... Build succeeded. Failed executing DbCommand (56ms) [Parameters=[], CommandType='Text', CommandTimeout='30'] ALTER TABLE [Balance1Part] ADD CONSTRAINT [FK_Balance1Part_Balance1_Balance1Id] FOREIGN KEY ([Balance1Id]) REFERENCES [Balance1] ([Id]) ON DELETE CASCADE; fail: Microsoft.EntityFrameworkCore.Database.Command[20102] Failed executing DbCommand (56ms) [Parameters=[], CommandType='Text', CommandTimeout='30'] ALTER TABLE [Balance1Part] ADD CONSTRAINT [FK_Balance1Part_Balance1_Balance1Id] FOREIGN KEY ([Balance1Id]) REFERENCES [Balance1] ([Id]) ON DELETE CASCADE; Microsoft.Data.SqlClient.SqlException (0x80131904): The ALTER TABLE statement conflicted with the FOREIGN KEY constraint "FK_Balance1Part_Balance1_Balance1Id". The conflict occurred in database "db-vrhit05042021", table "dbo.Balance1", column 'Id'. at Microsoft.Data.SqlClient.SqlConnection.OnError(SqlException exception, Boolean breakConnection, Action1 wrapCloseInAction) at Microsoft.Data.SqlClient.SqlInternalConnection.OnError(SqlException exception, Boolean breakConnection, Action1 wrapCloseInAction) at Microsoft.Data.SqlClient.TdsParser.ThrowExceptionAndWarning(TdsParserStateObject stateObj, Boolean callerHasConnectionLock, Boolean asyncClose) at Microsoft.Data.SqlClient.TdsParser.TryRun(RunBehavior runBehavior, SqlCommand cmdHandler, SqlDataReader dataStream, BulkCopySimpleResultSet bulkCopyHandler, TdsParserStateObject stateObj, Boolean& dataReady) at Microsoft.Data.SqlClient.SqlCommand.RunExecuteNonQueryTds(String methodName, Boolean isAsync, Int32 timeout, Boolean asyncWrite) at Microsoft.Data.SqlClient.SqlCommand.InternalExecuteNonQuery(TaskCompletionSource1 completion, Boolean sendToPipe, Int32 timeout, Boolean& usedCache, Boolean asyncWrite, Boolean inRetry, String methodName) at Microsoft.Data.SqlClient.SqlCommand.ExecuteNonQuery() at Microsoft.EntityFrameworkCore.Storage.RelationalCommand.ExecuteNonQuery(RelationalCommandParameterObject parameterObject) at Microsoft.EntityFrameworkCore.Migrations.MigrationCommand.ExecuteNonQuery(IRelationalConnection connection, IReadOnlyDictionary2 parameterValues) at Microsoft.EntityFrameworkCore.Migrations.Internal.MigrationCommandExecutor.ExecuteNonQuery(IEnumerable`1 migrationCommands, IRelationalConnection connection) at Microsoft.EntityFrameworkCore.Migrations.Internal.Migrator.Migrate(String targetMigration) at Microsoft.EntityFrameworkCore.Design.Internal.MigrationsOperations.UpdateDatabase(String targetMigration, String contextType) at Microsoft.EntityFrameworkCore.Design.OperationExecutor.UpdateDatabaseImpl(String targetMigration, String contextType) at Microsoft.EntityFrameworkCore.Design.OperationExecutor.UpdateDatabase.<>c__DisplayClass0_0.<.ctor>b__0() at Microsoft.EntityFrameworkCore.Design.OperationExecutor.OperationBase.Execute(Action action) ClientConnectionId:b538f2ff-0a95-4975-ab15-ed75eca72382 Error Number:547,State:0,Class:16 The ALTER TABLE statement conflicted with the FOREIGN KEY constraint "FK_Balance1Part_Balance1_Balance1Id". The conflict occurred in database "db-vrhit05042021", table "dbo.Balance1", column 'Id'.

The migration I'm looking to apply here should add the foreign key FK_Balance1Part_Balance1_Balance1Id and that foreign key doesn't seem to exist on the database. How can I resolve this issue?

I'm trying to do this on an Azure SQL Server instance.

Here's the migration: