指定键太长;最大密钥长度为767字节实体框架中的Mysql错误6 [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在Asp.net Mvc-5应用程序。所以我已经从nuget下载了Entity Framework-6和MySQL 6.8.3.0。当我尝试通过使用db Context命令创建数据库

  dbContext.Database.CreateIfNotExists（）; 
  

抛出此异常。

指定的键太长;最大密钥长度为767字节

我已经搜索了，但找不到任何解决方案。在我的搜索中有一件事，这可能是Unicode字符的问题。我不知道如何处理这个问题。

已更新

我正在使用以下配置

 < configuration> 
< configSections> 
< section name =entityFrameworktype =System.Data.Entity.Internal.ConfigFile.EntityFrameworkSection，EntityFramework，Version = 6.0.0.0，Culture = neutral，PublicKeyToken = b77a5c561934e089requirePermission =false/> ; 
< / configSections> 
< entityFramework> 
< providers> 
< provider invariantName =MySql.Data.MySqlClienttype =MySql.Data.MySqlClient.MySqlProviderServices，MySql.Data.Entity.EF6/> 
< / providers> 
< / entityFramework> 
< system.data> 
< DbProviderFactories> 
< remove invariant =MySql.Data.MySqlClient/> 
< add name =MySQL数据提供者invariant =MySql.Data.MySqlClientdescription =。用于MySQL的Net Framework数据提供者type =MySql.Data.MySqlClient.MySqlClientFactory，MySql.Data，Version = 6.8.3.0，Culture = neutral，PublicKeyToken = c5687fc88969c44d/> 
< / DbProviderFactories> 
< /system.data> 
< / configuration> 
  

我的DB上下文类。我已经删除了所有的模型，只剩下一个模型

  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;组; 
 
} 
  

模特类

  public class ModelOne 
 {
 [Key] 
 public int CreatedId {get;组; } 
 public Nullable< int> UserId {get;组; } 
 public Nullable< DateTime>日期{get;组; } 
 public string描述{get;组; 
} 
  

任何人都可以帮我解决这个问题？

谢谢。

解决方案

我已经改变了DbContext的DbConfigurationType。
$ b

从此链接 stackoverflow

现在正在工作

  [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;组; } 
 
} 
  

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();

This exception thrown.

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

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.

Updated

I am using following configuration

<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>

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; }

}

Model class

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; }
  }

Can anyone help me with this issue?

Thank you.

解决方案

I have changed the DbConfigurationType of DbContext.

Got from this this link stackoverflow

Now it is working

[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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