指定的密钥太长；实体框架 6 中的最大密钥长度为 767 字节 Mysql 错误 [英] Specified key was too long; max key length is 767 bytes Mysql error in Entity Framework 6

问题描述

我已经开始使用 Visual Studio 2012 开发 Asp.net Mvc-5 应用程序.所以我从 nuget 下载了 Entity Framework-6 和 MySQL 6.8.3.0.当我尝试使用 db Context 命令创建数据库时

I have start working on Asp.net Mvc-5 application using visual studio 2012. So I have downloaded Entity Framework-6 and MySQL 6.8.3.0 from nuget. When I tried to create database by using db Context command

dbContext.Database.CreateIfNotExists();

抛出这个异常.

指定的密钥太长；最大密钥长度为 767 字节

Specified key was too long; max key length is 767 bytes

我已经对其进行了搜索，但找不到任何解决方案.我在搜索过程中得到的一件事，这可能是 Unicode 字符问题.我不知道如何处理这个问题.

I have done search on it, but cannot find any solution. One thing that I got during my search, this can be Unicode characters problem. I don't know how to deal with this issue.

更新

我正在使用以下配置

<configuration>
  <configSections>
    <section name="entityFramework" type="System.Data.Entity.Internal.ConfigFile.EntityFrameworkSection, EntityFramework, Version=6.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" requirePermission="false" />
  </configSections>
  <entityFramework>
    <providers>
      <provider invariantName="MySql.Data.MySqlClient" type="MySql.Data.MySqlClient.MySqlProviderServices, MySql.Data.Entity.EF6" />
    </providers>
  </entityFramework>
  <system.data>
    <DbProviderFactories>
      <remove invariant="MySql.Data.MySqlClient" />
      <add name="MySQL Data Provider" invariant="MySql.Data.MySqlClient" description=".Net Framework Data Provider for MySQL" type="MySql.Data.MySqlClient.MySqlClientFactory, MySql.Data, Version=6.8.3.0, Culture=neutral, PublicKeyToken=c5687fc88969c44d" />
    </DbProviderFactories>
  </system.data>
</configuration>

我的数据库上下文类.我已经删除了所有模型，只保留了一个模型

My DB Context class. I have removed all the models just keep left one model

public class MyContext : DbContext
{
    public MyContext()
        : base("myconn")
    {
        this.Configuration.ValidateOnSaveEnabled = false;
    }

    protected override void OnModelCreating(DbModelBuilder modelBuilder)
    {
        modelBuilder.Conventions.Remove<System.Data.Entity.ModelConfiguration.Conventions.PluralizingTableNameConvention>();
        base.OnModelCreating(modelBuilder);
    }

    public DbSet<ModelOne> ModelOne { get; set; }

}

模型类

public class  ModelOne
{
        [Key]
        public int CreatedId { get; set; }
        public Nullable<int> UserId { get; set; }
        public Nullable<DateTime> Date { get; set; }
        public string Description { get; set; }
  }

谁能帮我解决这个问题?

Can anyone help me with this issue?

谢谢.

推荐答案

我已经更改了 DbContext 的 DbConfigurationType.

I have changed the DbConfigurationType of DbContext.

从此链接获得 stackoverflow

现在可以正常使用了

[DbConfigurationType(typeof(MySql.Data.Entity.MySqlEFConfiguration))]
public class MyContext : DbContext
{
    public MyContext()
        : base("myconn")
    {
        this.Configuration.ValidateOnSaveEnabled = false;
    }

    static MyContext()
    {
            DbConfiguration.SetConfiguration(new MySql.Data.Entity.MySqlEFConfiguration());
    }

    protected override void OnModelCreating(DbModelBuilder modelBuilder)
    {
        modelBuilder.Conventions.Remove<System.Data.Entity.ModelConfiguration.Conventions.PluralizingTableNameConvention>();
        base.OnModelCreating(modelBuilder);
    }

    public DbSet<ModelOne> ModelOne { get; set; }

}

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