Entity Framework Core ha introdotto i metodi HasServiceTier e HasPerformanceLevel per modificare l'edizione di un server SQL di Azure. Puoi usarli in OnModelCreating in questo modo:
protected override void OnModelCreating(ModelBuilder modelBuilder)
{
base.OnModelCreating(modelBuilder);
modelBuilder.HasServiceTier("Basic");
modelBuilder.HasPerformanceLevel("Basic");
}
Se si utilizza Add-Migration Add-Migration si ottiene una migrazione come questa:
public partial class ChangedDatabaseServiceTierToBasic : Migration
{
protected override void Up(MigrationBuilder migrationBuilder)
{
migrationBuilder.AlterDatabase()
.Annotation("SqlServer:EditionOptions", "EDITION = 'Basic', SERVICE_OBJECTIVE = 'Basic'");
}
protected override void Down(MigrationBuilder migrationBuilder)
{
migrationBuilder.AlterDatabase()
.OldAnnotation("SqlServer:EditionOptions", "EDITION = 'Basic', SERVICE_OBJECTIVE = 'Basic'");
}
}
Questo sembra funzionare correttamente ma quando provo ad applicare questa migrazione a un DB locale non di Azure a scopo di sviluppo, viene visualizzato il seguente errore:
Microsoft.EntityFrameworkCore.Migrations[20402]
Applying migration '20200413102908_ChangedDatabaseServiceTierToBasic'.
Applying migration '20200413102908_ChangedDatabaseServiceTierToBasic'.
fail: Microsoft.EntityFrameworkCore.Database.Command[20102]
Failed executing DbCommand (3ms) [Parameters=[], CommandType='Text', CommandTimeout='30']
BEGIN
DECLARE @db_name NVARCHAR(MAX) = DB_NAME();
EXEC(N'ALTER DATABASE ' + @db_name + ' MODIFY (
EDITION = ''Basic'', SERVICE_OBJECTIVE = ''Basic'' );');
END
Failed executing DbCommand (3ms) [Parameters=[], CommandType='Text', CommandTimeout='30']
BEGIN
DECLARE @db_name NVARCHAR(MAX) = DB_NAME();
EXEC(N'ALTER DATABASE ' + @db_name + ' MODIFY (
EDITION = ''Basic'', SERVICE_OBJECTIVE = ''Basic'' );');
END
Microsoft.Data.SqlClient.SqlException (0x80131904): Incorrect syntax near '.'.
at Microsoft.Data.SqlClient.SqlConnection.OnError(SqlException exception, Boolean breakConnection, Action`1 wrapCloseInAction)
at Microsoft.Data.SqlClient.SqlInternalConnection.OnError(SqlException exception, Boolean breakConnection, Action`1 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(TaskCompletionSource`1 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, IReadOnlyDictionary`2 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:d9f92b81-9916-48ee-9686-6d0f567ab86f
Error Number:102,State:1,Class:15
Incorrect syntax near '.'.
Presumo che i comandi non siano validi per i DB non di Azure. Quindi la domanda è: come posso impedire che questi comandi vengano eseguiti su DB non di Azure?