如何跳过ef core中的某些迁移？

Question

我在ef上下文中进行了som更改，并添加了新的偏头痛

dotnet ef migrations add changed98112601

然后我运行以下命令

dotnet ef database update

我的输出如下，似乎要应用初始迁移。如何防止这种情况？

开始构建...构建成功。正在应用迁移'20191225133128_Initial'。执行DbCommand失败（159ms）[Parameters = []，CommandType ='Text'，CommandTimeout = '30']创建表[诗]（[Id] int NOT NULL IDENTITY，[Number] int NOT NULL，[含义] nvarchar（max）NULL，约束[PK_Poems]主键（[Id]））;Microsoft.Data.SqlClient.SqlException（0x80131904）：数据库中已经有一个名为“ Poems”的对象。在E. agent1_work 34 s src Microsoft.Data.SqlClient netcore src Microsoft Data 中的Microsoft.Data.SqlClient.SqlConnection.OnError（SqlException异常，布尔值BreakConnection，Action1 wrapCloseInAction) in E:agent1\_work34ssrcMicrosoft.Data.SqlClient etcoresrcMicrosoftDataSqlClientSqlConnection.cs:line 1591 at Microsoft.Data.SqlClient.SqlInternalConnection.OnError(SqlException exception, Boolean breakConnection, Action1 wrapCloseInAction） SqlClient SqlInternalConnection.cs：第618行在E. agent1_work 34 s src Microsoft.Data.SqlClient netcore src Microsoft Data SqlClient TdsParser中的Microsoft.Data.SqlClient.TdsParser.ThrowExceptionAndWarning（TdsParserStateObject stateObj，Boolean callerHasConnectionLock，Boolean asyncClose）中。 cs：1169行在Microsoft.Data.SqlClient.TdsParser.TryRun（RunBehavior runBehavior，SqlCommand cmdHandler，SqlDataReader dataStream，BulkCopySimpleResultSet bulkCopyHandler，TdsParserStateObject stateObj，Boolean＆dataReady）在E： agent1_work 34 s src Microsoft.Data.SqlClient netcore Microsoft Data SqlClient TdsParser.cs：第1719行在Microsoft.Data.SqlClient.SqlCommand.RunExecuteNonQueryTds（String methodName，Boolean isAsync，Int32 timeout，Boolean asyncWrite）在E： agent1_work 34 s src Microsoft.Data.SqlClient netcore src Microsoft Data SqlClient中 SqlCommand.cs：第2857行在Microsoft.Data.SqlClient.SqlCommand.InternalExecuteNonQuery（TaskCompletionSource1 completion, Boolean sendToPipe, Int32 timeout, Boolean& usedCache, Boolean asyncWrite, Boolean inRetry, String methodName) in E:agent1\_work34ssrcMicrosoft.Data.SqlClient etcoresrcMicrosoftDataSqlClientSqlCommand.cs:line 1395 at Microsoft.Data.SqlClient.SqlCommand.ExecuteNonQuery() in E:agent1\_work34ssrcMicrosoft.Data.SqlClient etcoresrcMicrosoftDataSqlClientSqlCommand.cs:line 974 at Microsoft.EntityFrameworkCore.Storage.RelationalCommand.ExecuteNonQuery(RelationalCommandParameterObject parameterObject) at Microsoft.EntityFrameworkCore.Migrations.MigrationCommand.ExecuteNonQuery(IRelationalConnection connection, IReadOnlyDictionary2 parameterValues）在Microsoft.EntityFrameworkCore.Migrations.Internal.MigrationCommandExecutor.ExecuteNonQuery（IEnumerable`1 migrationCommands，IRelationalConnection连接）在Microsoft.EntityFrameworkCore.Migrations.Internal.Migrator.Migrate（String targetMigration）在Microsoft.EntityFrameworkCore.Design.Internal.MigrationsOperations.UpdateDatabase（String targetMigration，String contextType）在Microsoft.EntityFrameworkCore.Design.OperationExecutor.UpdateDatabaseImpl（String targetMigration，String contextType）在Microsoft.EntityFrameworkCore.Design.OperationExecutor.UpdateDatabase。<> c__DisplayClass0_0。<.ctor>b__0（）在Microsoft.EntityFrameworkCore.Design.OperationExecutor.OperationBase.Execute（Action操作）ClientConnectionId：b1027e70-d231-407a-87a0-5b53d06d2782错误号：2714，状态：6，类别：16数据库中已经有一个名为“ Poems”的对象。