相关疑难解决方法(0)

我正在使用MySql官方连接提供程序作为数据库.我正在尝试使用mac上的下一个项目示例(asp.net core 1.0):

public class BloggingContext : DbContext
{
    public BloggingContext(DbContextOptions<BloggingContext> options)
        : base(options)
    { }

    public DbSet<Blog> Blogs { get; set; }
    public DbSet<Post> Posts { get; set; }
}

public class Blog
{
    public int BlogId { get; set; }
    public string Url { get; set; }

    public List<Post> Posts { get; set; }
}

public class Post
{
    public int PostId { get; set; }
    public string Title { get; set; }
    public string Content …

设置

Asp.NET core网站2.2和EF Core 2.2
具有多个模式的Postgresql数据库，并且其中一个模式已经有__EFMigrationsHistory表

当尝试时

Add-Migration x1 -Context YodaContext 有用

但是当第一次尝试以下语句时
Update-Database -Context YodaContext（我在此架构中没有任何表，这是第一个更新数据库），我看到以下错误。

Failed executing DbCommand (85ms) [Parameters=[], CommandType='Text', CommandTimeout='30']
SELECT "MigrationId", "ProductVersion"
FROM "__EFMigrationsHistory"
ORDER BY "MigrationId";
Npgsql.PostgresException (0x80004005): 42P01: relation "__EFMigrationsHistory" does not exist
   at Npgsql.NpgsqlConnector.<>c__DisplayClass161_0.<<ReadMessage>g__ReadMessageLong|0>d.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at Npgsql.NpgsqlConnector.<>c__DisplayClass161_0.<<ReadMessage>g__ReadMessageLong|0>d.MoveNext() in C:\projects\npgsql\src\Npgsql\NpgsqlConnector.cs:line 1032
--- End of stack trace from previous location where exception was thrown ---
   at Npgsql.NpgsqlDataReader.NextResult(Boolean async, Boolean isConsuming) …

我在.net core 1.1中使用单个用户帐户标识创建新项目。我在Startup.cs中添加MySql提供程序：

services.AddDbContext<ApplicationDbContext>(options => 
        options.UseMySQL(Configuration.GetConnectionString("DefaultConnection")));

但是当我尝试时update-database会出现如下错误：

MySql.Data.MySqlClient.MySqlException: Table 'cloud.__EFMigrationsHistory' doesn't exist    at MySql.Data.MySqlClient.MySqlStream.ReadPacket()
    at MySql.Data.MySqlClient.NativeDriver.GetResult(Int32& affectedRow, Int64& insertedId)
   at MySql.Data.MySqlClient.Driver.NextResult(Int32 statementId, Boolean force)
   at MySql.Data.MySqlClient.MySqlDataReader.NextResult()
   at MySql.Data.MySqlClient.MySqlCommand.ExecuteReader(CommandBehavior behavior)
   at MySql.Data.EntityFrameworkCore.Storage.Internal.MySQLRelationalCommand.Execute(IRelationalConnection connection, String executeMethod, IReadOnlyDictionary`2 parameterValues, Boolean closeConnection)
    at Microsoft.EntityFrameworkCore.Storage.Internal.RelationalCommand.ExecuteReader(IRelationalConnection connection, IReadOnlyDictionary`2 parameterValues)
    at Microsoft.EntityFrameworkCore.Migrations.HistoryRepository.GetAppliedMigrations() 
   at Microsoft.EntityFrameworkCore.Migrations.Internal.Migrator.Migrate(String targetMigration)
    at Microsoft.EntityFrameworkCore.Design.MigrationsOperations.UpdateDatabase(String targetMigration, String contextType) 
   at Microsoft.EntityFrameworkCore.Tools.Cli.DatabaseUpdateCommand.<>c__DisplayClass0_0.<Configure>b__0()
    at Microsoft.Extensions.CommandLineUtils.CommandLineApplication.Execute(String[] args)
    at Microsoft.EntityFrameworkCore.Tools.Cli.Program.Main(String[] args)
 Table 'cloud.__EFMigrationsHistory' doesn't exist 

我该做什么？