我刚刚完成了我的应用程序的构建，并发现我创建的 azure mysql db 给了我一些错误。当我在开发过程中在本地使用普通 mysql 数据库时，一切正常且完美，当我从外部 api 将一些数据播种到 azure db 时，数据库保存了更改，但唯一的问题是它无法查看或保存我的应用程序生成的更改. 我正在使用 pomelo mysql 数据客户端 3.2.4 。当我尝试将用户注册到 azure db 时，出现此错误：
Microsoft.EntityFrameworkCore.Database.Command[20102]
Failed executing DbCommand (138ms) [Parameters=[@__normalizedUserName_0='?' (Size = 256)], CommandType='Text', CommandTimeout='30']
SELECT `a`.`Id`, `a`.`AccessFailedCount`, `a`.`Bio`, `a`.`ConcurrencyStamp`, `a`.`CreatedAt`, `a`.`Email`, `a`.`EmailConfirmed`, `a`.`Gender`, `a`.`GravatarP
rofileImage`, `a`.`Instagram`, `a`.`LockoutEnabled`, `a`.`LockoutEnd`, `a`.`NormalizedEmail`, `a`.`NormalizedUserName`, `a`.`PasswordHash`, `a`.`PhoneNumber`, `a`.
`PhoneNumberConfirmed`, `a`.`SecurityStamp`, `a`.`Twitch`, `a`.`Twitter`, `a`.`TwoFactorEnabled`, `a`.`UserName`, `a`.`Youtube`
FROM `AspNetUsers` AS `a`
WHERE `a`.`NormalizedUserName` = @__normalizedUserName_0
LIMIT 1
fail: Microsoft.EntityFrameworkCore.Query[10100]
An exception occurred while iterating over the results of a query for context type 'Persistance.DataContext'.
MySql.Data.MySqlClient.MySqlException (0x80004005): Unknown column 'a.CreatedAt' in 'field list'
---> MySql.Data.MySqlClient.MySqlException (0x80004005): Unknown column 'a.CreatedAt' in 'field list'
at MySqlConnector.Core.ServerSession.ReceiveReplyAsyncAwaited(ValueTask`1 task) in /_/src/MySqlConnector/Core/ServerSession.cs:line 806
at MySqlConnector.Core.ResultSet.ReadResultSetHeaderAsync(IOBehavior ioBehavior) in /_/src/MySqlConnector/Core/ResultSet.cs:line 51
at MySql.Data.MySqlClient.MySqlDataReader.ActivateResultSet() in /_/src/MySqlConnector/MySql.Data.MySqlClient/MySqlDataReader.cs:line 130
at MySql.Data.MySqlClient.MySqlDataReader.CreateAsync(CommandListPosition commandListPosition, ICommandPayloadCreator payloadCreator, IDictionary`2 cached
Procedures, IMySqlCommand command, CommandBehavior behavior, IOBehavior ioBehavior, CancellationToken cancellationToken) in /_/src/MySqlConnector/MySql.Data.MySqlC
lient/MySqlDataReader.cs:line 391
at MySqlConnector.Core.CommandExecutor.ExecuteReaderAsync(IReadOnlyList`1 commands, ICommandPayloadCreator payloadCreator, CommandBehavior behavior, IOBeh
avior ioBehavior, CancellationToken cancellationToken) in /_/src/MySqlConnector/Core/CommandExecutor.cs:line 62
at MySql.Data.MySqlClient.MySqlCommand.ExecuteDbDataReaderAsync(CommandBehavior behavior, CancellationToken cancellationToken) in /_/src/MySqlConnector/My
Sql.Data.MySqlClient/MySqlCommand.cs:line 257
at Microsoft.EntityFrameworkCore.Storage.RelationalCommand.ExecuteReaderAsync(RelationalCommandParameterObject parameterObject, CancellationToken cancella
tionToken)
at Microsoft.EntityFrameworkCore.Storage.RelationalCommand.ExecuteReaderAsync(RelationalCommandParameterObject parameterObject, CancellationToken cancella
tionToken)
at Microsoft.EntityFrameworkCore.Storage.RelationalCommand.ExecuteReaderAsync(RelationalCommandParameterObject parameterObject, CancellationToken cancella
tionToken)
at Microsoft.EntityFrameworkCore.Query.Internal.QueryingEnumerable`1.AsyncEnumerator.InitializeReaderAsync(DbContext _, Boolean result, CancellationToken
cancellationToken)
at Pomelo.EntityFrameworkCore.MySql.Storage.Internal.MySqlExecutionStrategy.ExecuteAsync[TState,TResult](TState state, Func`4 operation, Func`4 verifySucc
eeded, CancellationToken cancellationToken)
at Microsoft.EntityFrameworkCore.Query.Internal.QueryingEnumerable`1.AsyncEnumerator.MoveNextAsync()
MySql.Data.MySqlClient.MySqlException (0x80004005): Unknown column 'a.CreatedAt' in 'field list'
---> MySql.Data.MySqlClient.MySqlException (0x80004005): Unknown column 'a.CreatedAt' in 'field list'
at MySqlConnector.Core.ServerSession.ReceiveReplyAsyncAwaited(ValueTask`1 task) in /_/src/MySqlConnector/Core/ServerSession.cs:line 806
at MySqlConnector.Core.ResultSet.ReadResultSetHeaderAsync(IOBehavior ioBehavior) in /_/src/MySqlConnector/Core/ResultSet.cs:line 51
at MySql.Data.MySqlClient.MySqlDataReader.ActivateResultSet() in /_/src/MySqlConnector/MySql.Data.MySqlClient/MySqlDataReader.cs:line 130
at MySql.Data.MySqlClient.MySqlDataReader.CreateAsync(CommandListPosition commandListPosition, ICommandPayloadCreator payloadCreator, IDictionary`2 cachedProced
ures, IMySqlCommand command, CommandBehavior behavior, IOBehavior ioBehavior, CancellationToken cancellationToken) in /_/src/MySqlConnector/MySql.Data.MySqlClient/
MySqlDataReader.cs:line 391
at MySqlConnector.Core.CommandExecutor.ExecuteReaderAsync(IReadOnlyList`1 commands, ICommandPayloadCreator payloadCreator, CommandBehavior behavior, IOBehavior
ioBehavior, CancellationToken cancellationToken) in /_/src/MySqlConnector/Core/CommandExecutor.cs:line 62
at MySql.Data.MySqlClient.MySqlCommand.ExecuteDbDataReaderAsync(CommandBehavior behavior, CancellationToken cancellationToken) in /_/src/MySqlConnector/MySql.Da
ta.MySqlClient/MySqlCommand.cs:line 257
at Microsoft.EntityFrameworkCore.Storage.RelationalCommand.ExecuteReaderAsync(RelationalCommandParameterObject parameterObject, CancellationToken cancellationTo
ken)
at Microsoft.EntityFrameworkCore.Storage.RelationalCommand.ExecuteReaderAsync(RelationalCommandParameterObject parameterObject, CancellationToken cancellationTo
ken)
at Microsoft.EntityFrameworkCore.Storage.RelationalCommand.ExecuteReaderAsync(RelationalCommandParameterObject parameterObject, CancellationToken cancellationTo
ken)
at Microsoft.EntityFrameworkCore.Query.Internal.QueryingEnumerable`1.AsyncEnumerator.InitializeReaderAsync(DbContext _, Boolean result, CancellationToken cancel
lationToken)
at Pomelo.EntityFrameworkCore.MySql.Storage.Internal.MySqlExecutionStrategy.ExecuteAsync[TState,TResult](TState state, Func`4 operation, Func`4 verifySucceeded,
CancellationToken cancellationToken)
at Microsoft.EntityFrameworkCore.Query.Internal.QueryingEnumerable`1.AsyncEnumerator.MoveNextAsync()
fail: Api.Middlewares.Errors.ErrorHandlingMiddleware[0]
SERVER ERROR
MySql.Data.MySqlClient.MySqlException (0x80004005): Unknown column 'a.CreatedAt' in 'field list'
---> MySql.Data.MySqlClient.MySqlException (0x80004005): Unknown column 'a.CreatedAt' in 'field list'
at MySqlConnector.Core.ServerSession.ReceiveReplyAsyncAwaited(ValueTask`1 task) in /_/src/MySqlConnector/Core/ServerSession.cs:line 806
at MySqlConnector.Core.ResultSet.ReadResultSetHeaderAsync(IOBehavior ioBehavior) in /_/src/MySqlConnector/Core/ResultSet.cs:line 51
at MySql.Data.MySqlClient.MySqlDataReader.ActivateResultSet() in /_/src/MySqlConnector/MySql.Data.MySqlClient/MySqlDataReader.cs:line 130
at MySql.Data.MySqlClient.MySqlDataReader.CreateAsync(CommandListPosition commandListPosition, ICommandPayloadCreator payloadCreator, IDictionary`2 cachedProced
ures, IMySqlCommand command, CommandBehavior behavior, IOBehavior ioBehavior, CancellationToken cancellationToken) in /_/src/MySqlConnector/MySql.Data.MySqlClient/
MySqlDataReader.cs:line 391
at MySqlConnector.Core.CommandExecutor.ExecuteReaderAsync(IReadOnlyList`1 commands, ICommandPayloadCreator payloadCreator, CommandBehavior behavior, IOBehavior
ioBehavior, CancellationToken cancellationToken) in /_/src/MySqlConnector/Core/CommandExecutor.cs:line 62
at MySql.Data.MySqlClient.MySqlCommand.ExecuteDbDataReaderAsync(CommandBehavior behavior, CancellationToken cancellationToken) in /_/src/MySqlConnector/MySql.Da
ta.MySqlClient/MySqlCommand.cs:line 257
at Microsoft.EntityFrameworkCore.Storage.RelationalCommand.ExecuteReaderAsync(RelationalCommandParameterObject parameterObject, CancellationToken cancellationTo
ken)
at Microsoft.EntityFrameworkCore.Storage.RelationalCommand.ExecuteReaderAsync(RelationalCommandParameterObject parameterObject, CancellationToken cancellationTo
ken)
at Microsoft.EntityFrameworkCore.Storage.RelationalCommand.ExecuteReaderAsync(RelationalCommandParameterObject parameterObject, CancellationToken cancellationTo
ken)
at Microsoft.EntityFrameworkCore.Query.Internal.QueryingEnumerable`1.AsyncEnumerator.InitializeReaderAsync(DbContext _, Boolean result, CancellationToken cancel
lationToken)
at Pomelo.EntityFrameworkCore.MySql.Storage.Internal.MySqlExecutionStrategy.ExecuteAsync[TState,TResult](TState state, Func`4 operation, Func`4 verifySucceeded,
CancellationToken cancellationToken)
at Microsoft.EntityFrameworkCore.Query.Internal.QueryingEnumerable`1.AsyncEnumerator.MoveNextAsync()
at Microsoft.EntityFrameworkCore.Query.ShapedQueryCompilingExpressionVisitor.SingleOrDefaultAsync[TSource](IAsyncEnumerable`1 asyncEnumerable, CancellationToken
cancellationToken)
at Microsoft.EntityFrameworkCore.Query.ShapedQueryCompilingExpressionVisitor.SingleOrDefaultAsync[TSource](IAsyncEnumerable`1 asyncEnumerable, CancellationToken
cancellationToken)
at Microsoft.AspNetCore.Identity.UserManager`1.FindByNameAsync(String userName)
at Microsoft.AspNetCore.Identity.UserValidator`1.ValidateUserName(UserManager`1 manager, TUser user, ICollection`1 errors)
at Microsoft.AspNetCore.Identity.UserValidator`1.ValidateAsync(UserManager`1 manager, TUser user)
at Microsoft.AspNetCore.Identity.UserManager`1.ValidateUserAsync(TUser user)
at Microsoft.AspNetCore.Identity.UserManager`1.CreateAsync(TUser user)
at Microsoft.AspNetCore.Identity.UserManager`1.CreateAsync(TUser user, String password)
at Application.Auth.Register.Handler.Handle(Command request, CancellationToken cancellationToken) in C:\Users\Asus\Desktop\c#\Qlip\Application\Auth\Register.cs:
line 73
at MediatR.Pipeline.RequestExceptionProcessorBehavior`2.Handle(TRequest request, CancellationToken cancellationToken, RequestHandlerDelegate`1 next)
at MediatR.Pipeline.RequestExceptionProcessorBehavior`2.Handle(TRequest request, CancellationToken cancellationToken, RequestHandlerDelegate`1 next)
at MediatR.Pipeline.RequestExceptionActionProcessorBehavior`2.Handle(TRequest request, CancellationToken cancellationToken, RequestHandlerDelegate`1 next)
at MediatR.Pipeline.RequestExceptionActionProcessorBehavior`2.Handle(TRequest request, CancellationToken cancellationToken, RequestHandlerDelegate`1 next)
at MediatR.Pipeline.RequestPostProcessorBehavior`2.Handle(TRequest request, CancellationToken cancellationToken, RequestHandlerDelegate`1 next)
at MediatR.Pipeline.RequestPreProcessorBehavior`2.Handle(TRequest request, CancellationToken cancellationToken, RequestHandlerDelegate`1 next)
at Api.Controllers.UserController.Register(Command command) in C:\Users\Asus\Desktop\c#\Qlip\api\Controllers\UserController.cs:line 22
at lambda_method(Closure , Object )
at Microsoft.Extensions.Internal.ObjectMethodExecutorAwaitable.Awaiter.GetResult()
at Microsoft.AspNetCore.Mvc.Infrastructure.ActionMethodExecutor.AwaitableObjectResultExecutor.Execute(IActionResultTypeMapper mapper, ObjectMethodExecutor execu
tor, Object controller, Object[] arguments)
at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.<InvokeActionMethodAsync>g__Awaited|12_0(ControllerActionInvoker invoker, ValueTask`1 actionR
esultValueTask)
at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.<InvokeNextActionFilterAsync>g__Awaited|10_0(ControllerActionInvoker invoker, Task lastTask,
State next, Scope scope, Object state, Boolean isCompleted)
at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.Rethrow(ActionExecutedContextSealed context)
at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.Next(State& next, Scope& scope, Object& state, Boolean& isCompleted)
at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.<InvokeInnerFilterAsync>g__Awaited|13_0(ControllerActionInvoker invoker, Task lastTask, State
next, Scope scope, Object state, Boolean isCompleted)
at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.<InvokeFilterPipelineAsync>g__Awaited|19_0(ResourceInvoker invoker, Task lastTask, State next, Scope
scope, Object state, Boolean isCompleted)
at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.<InvokeAsync>g__Awaited|17_0(ResourceInvoker invoker, Task task, IDisposable scope)
at Microsoft.AspNetCore.Routing.EndpointMiddleware.<Invoke>g__AwaitRequestTask|6_0(Endpoint endpoint, Task requestTask, ILogger logger)
at Microsoft.AspNetCore.Authorization.AuthorizationMiddleware.Invoke(HttpContext context)
at Microsoft.AspNetCore.Authentication.AuthenticationMiddleware.Invoke(HttpContext context)
at Api.Middlewares.Errors.ErrorHandlingMiddleware.Invoke(HttpContext context) in C:\Users\Asus\Desktop\c#\Qlip\api\Middlewares\ErrorHandlingMiddleware.cs:line 3
0
如果我删除 azure mysql-db 连接字符串并将其替换为本地 mysql 连接字符串，则代码按预期工作。我的数据上下文类是：
public class DataContext : IdentityDbContext<ApplicationUser>
{
public DataContext(DbContextOptions<DataContext> options) : base(options)
{
}
public DbSet<Clip> Clips { get; set; }
public DbSet<Game> Games { get; set; }
public DbSet<UserClip> UserClips { get; set; }
public DbSet<DislikeUserClip> DislikeUserClips{ get; set; }
public DbSet<UserFollowings> Followings { get; set; }
public DbSet<Comment> Comments { get; set; }
public DbSet<View> Views { get; set; }
protected override void OnModelCreating(ModelBuilder modelBuilder)
{
base.OnModelCreating(modelBuilder);
modelBuilder.Entity<UserClip>().HasKey(uc => new {uc.ClipId, uc.ApplicationUserId});
modelBuilder.Entity<UserClip>().HasOne(au => au.ApplicationUser).WithMany(au => au.UserClips)
.HasForeignKey(au => au.ApplicationUserId);
modelBuilder.Entity<UserClip>().HasOne(c => c.Clip).WithMany(uc => uc.UserClips)
.HasForeignKey(c => c.ClipId);
modelBuilder.Entity<DislikeUserClip>().HasKey(duc => new {duc.ClipId, duc.ApplicationUserId});
modelBuilder.Entity<DislikeUserClip>().HasOne(au => au.ApplicationUser).WithMany(au => au.DislikeUserClips)
.HasForeignKey(au => au.ApplicationUserId);
modelBuilder.Entity<DislikeUserClip>().HasOne(c => c.Clip).WithMany(c => c.DislikeUserClips)
.HasForeignKey(c => c.ClipId);
modelBuilder.Entity<UserFollowings>().HasKey(uf => new {uf.ObserverId, uf.TargetId});
modelBuilder.Entity<UserFollowings>().HasOne(o => o.Observer).WithMany(uf => uf.Followings)
.HasForeignKey(o => o.ObserverId);
modelBuilder.Entity<UserFollowings>().HasOne(t => t.Target).WithMany(uf => uf.Followers)
.HasForeignKey(t => t.TargetId);
// view table
modelBuilder.Entity<View>().HasKey(v => new {v.ApplicationUserId, v.ClipId});
modelBuilder.Entity<View>().HasOne(au => au.User).WithMany(v => v.Views)
.HasForeignKey(x => x.ApplicationUserId);
modelBuilder.Entity<View>().HasOne(c => c.Clip).WithMany(v => v.Views).HasForeignKey(x => x.ClipId);
}
}
注意：当我第一次使用 azure db 启动我的应用程序时，它创建了我的应用程序所需的所有表，所以我不明白为什么会发生这种情况。由于这个错误，过去几天我一直在努力，老实说，我无法弄清楚发生了什么。请问谁能帮我解决我面临的这个问题？