如何首先使用MySql和Entity Framework 4.1代码 [英] How to use MySql and Entity Framework 4.1 code first

问题描述

我正在尝试在MVCMusicStore中使用MySQL数据库
http://mvcmusicstore.codeplex.com/而不是MSSQL.
我想学习使用MySQL进行代码优先开发.
我已经将这些代码添加到web.config

I am trying to use MySQL database in MVCMusicStore
http://mvcmusicstore.codeplex.com/ instead of MSSQL.
I would like to learn Code first development with MySQL.
I had added these code to web.config

<connectionStrings>
  <add name="MusicStoreEntities"
       connectionString="Server=localhost; Database=MvcMusicStore; Uid=root; Pwd=;"
       providerName="MySql.Data.MySqlClient"/>
</connectionStrings>
<system.data>
  <DbProviderFactories>
    <add name="MySQL Data Provider"
         invariant="MySql.Data.MySqlClient"  
         description=".Net Framework Data Provider for MySQL"  
         type="MySql.Data.MySqlClient.MySqlClientFactory, MySql.Data, Version=6.3.6.0, Culture=neutral, PublicKeyToken=c5687fc88969c44d" />
  </DbProviderFactories>   
</system.data>

MySQL数据库已创建，但未创建表. 我刚刚在项目中添加了Mysql.Data.MySQLClient.dll引用. 而且我有这种例外情况:

MySQL database is already created but tables are not created. I have just added Mysql.Data.MySQLClient.dll reference to my project. And I have this kind of exception:

为system.data创建配置节处理程序时发生错误:
列'InvariantName'被限制为唯一.
值'MySql.Data.MySqlClient'已经存在.
(C:\ Users \ Dauren \ Downloads \ MvcMusicStore-v3.0 \ MvcMusicStore-v3.0 \ MvcMusicStore-Completed \ MvcMusicStore \ web.config第47行)

An error occurred creating the configuration section handler for system.data:
Column 'InvariantName' is constrained to be unique.
Value 'MySql.Data.MySqlClient' is already present.
(C:\Users\Dauren\Downloads\MvcMusicStore-v3.0\MvcMusicStore-v3.0\MvcMusicStore-Completed\MvcMusicStore\web.config line 47)

推荐答案

尝试以下代码:

 <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=6.3.6.0, Culture=neutral, PublicKeyToken=c5687fc88969c44d" />  
  </DbProviderFactories>

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