Question

我有一个用string UserID和int EventID定义的UserCalendar模型。我的ApplicationDbContext类包含一个名为DbSet的{{1}} UserCalendars声明。不知何故，Calendars表的create-table语句如下：

Calendars

我认为这些多余的栏目阻止我在表格中添加任何记录，因为绝大多数都没有意义;日历是用户和事件之间的链接，因此只需要外键。

是什么导致create-table语句包含多余的列，以及如何解析？

CREATE TABLE [dbo].[Calendars] (
    [Id]                   NVARCHAR (450)     NOT NULL,
    [AccessFailedCount]    INT                NOT NULL,
    [ConcurrencyStamp]     NVARCHAR (MAX)     NULL,
    [Email]                NVARCHAR (MAX)     NULL,
    [EmailConfirmed]       BIT                NOT NULL,
    [EventID]              INT                NOT NULL,
    [LockoutEnabled]       BIT                NOT NULL,
    [LockoutEnd]           DATETIMEOFFSET (7) NULL,
    [NormalizedEmail]      NVARCHAR (MAX)     NULL,
    [NormalizedUserName]   NVARCHAR (MAX)     NULL,
    [PasswordHash]         NVARCHAR (MAX)     NULL,
    [PhoneNumber]          NVARCHAR (MAX)     NULL,
    [PhoneNumberConfirmed] BIT                NOT NULL,
    [SecurityStamp]        NVARCHAR (MAX)     NULL,
    [TwoFactorEnabled]     BIT                NOT NULL,
    [UserID]               NVARCHAR (MAX)     NOT NULL,
    [UserName]             NVARCHAR (MAX)     NULL,
    CONSTRAINT [PK_Calendars] PRIMARY KEY CLUSTERED ([Id] ASC)
);

UPDATE：UserCalendar类最初继承自IdentityUser。这已经修复了。尝试使用全新迁移运行Update-Database时，现在会创建以下错误消息：

public class UserCalendar
{
    [Required]
    public int UserCalendarID { get; set; }

    [Required]
    public string UserID { get; set; }

    [Required]
    public int EventID { get; set; }
}


public class ApplicationDbContext : IdentityDbContext<ApplicationUser>
{
    public ApplicationDbContext(DbContextOptions<ApplicationDbContext> options)
        : base(options)
    {
    }
    protected override void OnModelCreating(ModelBuilder builder)
    {
        base.OnModelCreating(builder);
    }
    public DbSet<Genre> Genres { get; set; }
    public DbSet<Event> Events { get; set; }
    public DbSet<ApplicationUser> Artists { get; set; }
    public DbSet<UserCalendar> Calendars { get; set; }
}

使用以下迁移尝试删除表，但这会产生相同的错误：

System.Data.SqlClient.SqlException: The object 'PK_Calendars' is dependent on column 'ID'.
ALTER TABLE ALTER COLUMN ID failed because one or more objects access this column.
   at System.Data.SqlClient.SqlConnection.OnError(SqlException exception, Boolean breakConnection, Action`1 wrapCloseInAction)
   at System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning(TdsParserStateObject stateObj, Boolean callerHasConnectionLock, Boolean asyncClose)
   at System.Data.SqlClient.TdsParser.TryRun(RunBehavior runBehavior, SqlCommand cmdHandler, SqlDataReader dataStream, BulkCopySimpleResultSet bulkCopyHandler, TdsParserStateObject stateObj, Boolean& dataReady)
   at System.Data.SqlClient.SqlCommand.RunExecuteNonQueryTds(String methodName, Boolean async, Int32 timeout, Boolean asyncWrite)
   at System.Data.SqlClient.SqlCommand.InternalExecuteNonQuery(TaskCompletionSource`1 completion, Boolean sendToPipe, Int32 timeout, Boolean asyncWrite, String methodName)
   at System.Data.SqlClient.SqlCommand.ExecuteNonQuery()
   at Microsoft.EntityFrameworkCore.Storage.Internal.RelationalCommand.Execute(IRelationalConnection connection, String executeMethod, IReadOnlyDictionary`2 parameterValues, Boolean closeConnection)
   at Microsoft.EntityFrameworkCore.Storage.Internal.RelationalCommand.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.UpdateDatabase.<>c__DisplayClass0_1.<.ctor>b__0()
   at Microsoft.EntityFrameworkCore.Design.OperationExecutor.OperationBase.Execute(Action action)
ClientConnectionId:90d49e6f-8365-4355-9470-fcf2745bb91b
Error Number:5074,State:1,Class:16
The object 'PK_Calendars' is dependent on column 'ID'.
ALTER TABLE ALTER COLUMN ID failed because one or more objects access this column.

ASP.NET MVC - 为什么我的表有这么多列？

0 个答案: