MySQL实体框架连接器是否与OrderBy（）不兼容？

Question

I'm using the MySQL Entity Framework Connector to connect to my MySQL Database.

Is it compatible with any order by functionality? Whenever I remove .OrderBy() from the code below, it works fine, but with it I get an error.

using Microsoft.AspNet.Identity;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;
using uQuiz.Domain;
using uQuiz.Domain.Abstract;

namespace uQuiz.WebUI.Controllers
{
    [Authorize]
    public class DashboardController : Controller
    {
        private QuizEntities Context;

        public DashboardController(QuizEntities context)
        {
            this.Context = context;
        }

        /// <summary>
        /// The quiz dashboard
        /// </summary>
        /// <returns></returns>
        public ActionResult Index()
        {
            // Get the logged in user ID
            int userId = Convert.ToInt32(User.Identity.GetUserId());

            IEnumerable<Quiz> usersQuizzes = this.Context.Quizzes.Where(x => x.UserId == userId && x.Deleted == false).OrderBy(d => d.CreatedTime).ToList();

            return View();
        }
    }
}

An exception of type 'System.Data.Entity.Core.EntityCommandExecutionException' occurred in EntityFramework.dll but was not handled in user code

Additional information: An error occurred while executing the command definition. See the inner exception for details.

Inner Exception Message: Unknown column 'Project1.C1' in 'field list'

This works

IEnumerable<Quiz> usersQuizzes = this.Context.Quizzes.Where(x => x.UserId == userId && x.Deleted == false).ToList();

This Doesn't

IEnumerable<Quiz> usersQuizzes = this.Context.Quizzes.Where(x => x.UserId == userId && x.Deleted == false).OrderBy(d => d.CreatedTime).ToList();

Here is the Quiz class that relates to Quizzes auto generated from my EDMX:

//------------------------------------------------------------------------------
// <auto-generated>
//     This code was generated from a template.
//
//     Manual changes to this file may cause unexpected behavior in your application.
//     Manual changes to this file will be overwritten if the code is regenerated.
// </auto-generated>
//------------------------------------------------------------------------------

namespace uQuiz.Domain
{
    using System;
    using System.Collections.Generic;

    public partial class Quiz
    {
        public Quiz()
        {
            this.Answers = new HashSet<Answer>();
            this.FeaturedQuizzes = new HashSet<FeaturedQuiz>();
            this.PersonalityOutcomes = new HashSet<PersonalityOutcome>();
            this.PossibleAnswers = new HashSet<PossibleAnswer>();
            this.Questions = new HashSet<Question>();
            this.QuizLinks = new HashSet<QuizLink>();
            this.QuizPasswords = new HashSet<QuizPassword>();
            this.QuizSubmissons = new HashSet<QuizSubmission>();
            this.QuizVersions = new HashSet<QuizVersion>();
            this.ResultDescriptions = new HashSet<ResultDescriptions>();
            this.Takers = new HashSet<Taker>();
        }

        public long Id { get; set; }
        public int UserId { get; set; }
        public long QuizVersionId { get; set; }
        public string IPAddress { get; set; }
        public int IsPublic { get; set; }
        public string QuizType { get; set; }
        public long CreatedTime { get; set; }
        public Nullable<long> BackgroundId { get; set; }
        public string UrlId { get; set; }
        public long PasswordsDisabled { get; set; }
        public long SharedFacebook { get; set; }
        public long SharedTwitter { get; set; }
        public Nullable<bool> Deleted { get; set; }
        public long ShowCorrections { get; set; }
        public long ShowBreakdown { get; set; }
        public string Thumbnail { get; set; }
        public string ShareImage { get; set; }
        public Nullable<long> LinkId { get; set; }
        public long ForceShareImage { get; set; }
        public long ShareCount { get; set; }
        public string BackgroundAlign { get; set; }
        public string BackgroundColour { get; set; }
        public string TextColour { get; set; }

        public virtual ICollection<Answer> Answers { get; set; }
        public virtual ICollection<FeaturedQuiz> FeaturedQuizzes { get; set; }
        public virtual ICollection<PersonalityOutcome> PersonalityOutcomes { get; set; }
        public virtual ICollection<PossibleAnswer> PossibleAnswers { get; set; }
        public virtual ICollection<Question> Questions { get; set; }
        public virtual QuizBackground QuizBackgrounds { get; set; }
        public virtual ICollection<QuizLink> QuizLinks { get; set; }
        public virtual ICollection<QuizPassword> QuizPasswords { get; set; }
        public virtual ICollection<QuizSubmission> QuizSubmissons { get; set; }
        public virtual ICollection<QuizVersion> QuizVersions { get; set; }
        public virtual User Users { get; set; }
        public virtual ICollection<ResultDescriptions> ResultDescriptions { get; set; }
        public virtual ICollection<Taker> Takers { get; set; }
        public virtual QuizVersion QuizVersion { get; set; }
    }
}

Update 1

I have generated a new EDMX from the same database within the same project called QuizEntities2 and this works fine, the only difference being that I haven't been through and changed the names for the mappings... here's the code I have within my controller. One works and the other doesn't it comes up with the error.

using (QuizEntities context1 = new QuizEntities())
{
    // ERROR: Unknown column 'Project1.C1' in 'field list'
    var quizzes1 = context1.Quizzes.Where(x => x.UserId == 1 && x.Deleted == false).OrderByDescending(x => x.CreatedTime).Skip(5).Take(5).ToList();
}

using (QuizEntities2 context2 = new QuizEntities2())
{
    // Works completely fine
    var quizzes = context2.quizzes.Where(x => x.user_id == 1 && x.deleted == false).OrderByDescending(x => x.created_time).Skip(5).Take(5).ToList();
}

Web.config

<?xml version="1.0" encoding="utf-8"?>
<!--
  For more information on how to configure your ASP.NET application, please visit
  http://go.microsoft.com/fwlink/?LinkId=169433
  -->
<configuration>
  <configSections>
    <!-- For more information on Entity Framework configuration, visit http://go.microsoft.com/fwlink/?LinkID=237468 -->
    <section name="entityFramework" type="System.Data.Entity.Internal.ConfigFile.EntityFrameworkSection, EntityFramework, Version=6.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" requirePermission="false" />
  </configSections>
  <connectionStrings>
    <add name="QuizEntities" connectionString="metadata=res://*/QuizModel.csdl|res://*/QuizModel.ssdl|res://*/QuizModel.msl;provider=MySql.Data.MySqlClient;provider connection string=&quot;server=localhost;user id=root;database=uquiznew&quot;" providerName="System.Data.EntityClient" />
    <add name="QuizEntities2" connectionString="metadata=res://*/ModelModel.Model1.csdl|res://*/ModelModel.Model1.ssdl|res://*/ModelModel.Model1.msl;provider=MySql.Data.MySqlClient;provider connection string=&quot;server=localhost;user id=root;database=uquiznew2&quot;" providerName="System.Data.EntityClient" />
  </connectionStrings>
  <entityFramework>
    <defaultConnectionFactory type="System.Data.Entity.Infrastructure.SqlConnectionFactory, EntityFramework" />
    <providers>
      <provider invariantName="MySql.Data.MySqlClient" type="MySql.Data.MySqlClient.MySqlProviderServices, MySql.Data.Entity.EF6" />
    </providers>
  </entityFramework>
  <appSettings>
    <add key="webpages:Version" value="3.0.0.0" />
    <add key="webpages:Enabled" value="false" />
    <add key="PreserveLoginUrl" value="true" />
    <add key="ClientValidationEnabled" value="true" />
    <add key="UnobtrusiveJavaScriptEnabled" value="true" />
    <add key="owin:AppStartup" value="uQuiz.OwinStart" />
  </appSettings>
  <system.web>
    <compilation debug="true" targetFramework="4.5" />
    <httpRuntime targetFramework="4.5" />
    <pages>
      <namespaces>
        <add namespace="System.Web.Helpers" />
        <add namespace="System.Web.Mvc" />
        <add namespace="System.Web.Mvc.Ajax" />
        <add namespace="System.Web.Mvc.Html" />
        <add namespace="System.Web.Routing" />
        <add namespace="System.Web.WebPages" />
      </namespaces>
    </pages>
  </system.web>
  <system.webServer>
    <validation validateIntegratedModeConfiguration="false" />
    <handlers>
      <remove name="ExtensionlessUrlHandler-Integrated-4.0" />
      <remove name="OPTIONSVerbHandler" />
      <remove name="TRACEVerbHandler" />
      <add name="ExtensionlessUrlHandler-Integrated-4.0" path="*." verb="*" type="System.Web.Handlers.TransferRequestHandler" preCondition="integratedMode,runtimeVersionv4.0" />
    </handlers>
  </system.webServer>
  <runtime>
    <assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">
      <dependentAssembly>
        <assemblyIdentity name="Newtonsoft.Json" culture="neutral" publicKeyToken="30ad4fe6b2a6aeed" />
        <bindingRedirect oldVersion="0.0.0.0-6.0.0.0" newVersion="6.0.0.0" />
      </dependentAssembly>
      <dependentAssembly>
        <assemblyIdentity name="System.Web.Helpers" publicKeyToken="31bf3856ad364e35" />
        <bindingRedirect oldVersion="1.0.0.0-3.0.0.0" newVersion="3.0.0.0" />
      </dependentAssembly>
      <dependentAssembly>
        <assemblyIdentity name="System.Web.Mvc" publicKeyToken="31bf3856ad364e35" />
        <bindingRedirect oldVersion="0.0.0.0-5.2.0.0" newVersion="5.2.0.0" />
      </dependentAssembly>
      <dependentAssembly>
        <assemblyIdentity name="System.Web.Optimization" publicKeyToken="31bf3856ad364e35" />
        <bindingRedirect oldVersion="1.0.0.0-1.1.0.0" newVersion="1.1.0.0" />
      </dependentAssembly>
      <dependentAssembly>
        <assemblyIdentity name="System.Web.WebPages" publicKeyToken="31bf3856ad364e35" />
        <bindingRedirect oldVersion="1.0.0.0-3.0.0.0" newVersion="3.0.0.0" />
      </dependentAssembly>
      <dependentAssembly>
        <assemblyIdentity name="WebGrease" publicKeyToken="31bf3856ad364e35" />
        <bindingRedirect oldVersion="0.0.0.0-1.5.2.14234" newVersion="1.5.2.14234" />
      </dependentAssembly>
      <dependentAssembly>
        <assemblyIdentity name="Microsoft.Owin" publicKeyToken="31bf3856ad364e35" culture="neutral" />
        <bindingRedirect oldVersion="0.0.0.0-3.0.0.0" newVersion="3.0.0.0" />
      </dependentAssembly>
    </assemblyBinding>
  </runtime>
</configuration>

Equivalent Quiz Class for Working DbContext

The auto pluralizer has mucked up the name and called it Quizze and I haven't changed it because I have just been testing a new EDMX...

//------------------------------------------------------------------------------
// <auto-generated>
//     This code was generated from a template.
//
//     Manual changes to this file may cause unexpected behavior in your application.
//     Manual changes to this file will be overwritten if the code is regenerated.
// </auto-generated>
//------------------------------------------------------------------------------

namespace uQuiz.Domain.ModelModel
{
    using System;
    using System.Collections.Generic;

    public partial class quizze
    {
        public quizze()
        {
            this.answers = new HashSet<answer>();
            this.featured_quizzes = new HashSet<featured_quizzes>();
            this.personality_outcomes = new HashSet<personality_outcomes>();
            this.possible_answers = new HashSet<possible_answers>();
            this.questions = new HashSet<question>();
            this.quiz_links = new HashSet<quiz_links>();
            this.quiz_passwords = new HashSet<quiz_passwords>();
            this.quiz_submissions = new HashSet<quiz_submissions>();
            this.quiz_versions = new HashSet<quiz_versions>();
            this.result_descriptions = new HashSet<result_descriptions>();
            this.takers = new HashSet<taker>();
        }

        public long quiz_ID { get; set; }
        public long user_id { get; set; }
        public long quiz_version_id { get; set; }
        public string ip_address { get; set; }
        public int @public { get; set; }
        public string quiz_type { get; set; }
        public long created_time { get; set; }
        public Nullable<long> background_id { get; set; }
        public string url_id { get; set; }
        public long passwords_disabled { get; set; }
        public long shared_facebook { get; set; }
        public long shared_twitter { get; set; }
        public Nullable<bool> deleted { get; set; }
        public long show_corrections { get; set; }
        public long show_breakdown { get; set; }
        public string thumbnail { get; set; }
        public string share_image { get; set; }
        public Nullable<long> link_id { get; set; }
        public long force_share_image { get; set; }
        public long share_count { get; set; }
        public string background_align { get; set; }
        public string background_colour { get; set; }
        public string text_colour { get; set; }

        public virtual ICollection<answer> answers { get; set; }
        public virtual ICollection<featured_quizzes> featured_quizzes { get; set; }
        public virtual ICollection<personality_outcomes> personality_outcomes { get; set; }
        public virtual ICollection<possible_answers> possible_answers { get; set; }
        public virtual ICollection<question> questions { get; set; }
        public virtual quiz_backgrounds quiz_backgrounds { get; set; }
        public virtual ICollection<quiz_links> quiz_links { get; set; }
        public virtual quiz_links quiz_links1 { get; set; }
        public virtual ICollection<quiz_passwords> quiz_passwords { get; set; }
        public virtual ICollection<quiz_submissions> quiz_submissions { get; set; }
        public virtual ICollection<quiz_versions> quiz_versions { get; set; }
        public virtual quiz_versions quiz_versions1 { get; set; }
        public virtual user user { get; set; }
        public virtual ICollection<result_descriptions> result_descriptions { get; set; }
        public virtual ICollection<taker> takers { get; set; }
    }
}

Answer 1

Apart from the . appearing twice in d..CreatedTime, (but that probably didn't fix it) CreatedTime must also be a field property and not a method. (I suspect it can be a method). Linq tries to convert your command to SQL, and SQL knows fields, but not your C# methods.

Also, ordering by a timestamp is suspicious, since values will all likely be unique, and it won't add ordering.

Otherwise, we'd have to inspect your class definition and compare it to the sql table definition.

Answer 2

I've worked out what the issue was. I had changed the type of the primary key Id on my Users table to Int32 so that I could use it with Identity Framework.

When I first generate my EDMX file, it generated it as Int64 .

I changed the data type back to Int64 as it was originally generated and it worked again.

Answer 3

我也遇到了这个错误，从数据库更新实体模型解决了该问题。