实体框架代码的SQL Server Compact 4.0连接字符串首先？

Question

I am creating an application for Windows XP so I am stuck with .Net framework 4.0. I tried to use SQL Server Compact and EF code first but it make an error when update-database .

I wish to put the database in my code directory to deploy in customer machine.

This is my connection string:

<add name="QuanLyKhoContext" 
     connectionString="Data Source=MyData.sdf;Persist Security Info=False;AttachDBFileName=MyData.sdf" 
     providerName="System.Data.SqlClient" />

And the error:

This operation requires a connection to the 'master' database. Unable to create a connection to the 'master' database because the original database connection has been opened and credentials have been removed from the connection string. Supply an unopened connection.

Answer 1

In one of my projects I used SQL Server Compact 4.0 and my connection string was simple enough:

  <connectionStrings>
    <add name="MyDB" 
            connectionString="Data Source=|DataDirectory|MyDB.sdf"
            providerName="System.Data.SqlServerCe.4.0" />
  </connectionStrings>

I think that you should check your providerName . I am not sure if System.Data.SqlClient is the right one.

Have you installed EntityFramework.SqlServerCompact NuGet package ? Once it is installed System.Data.SqlServerCe.4.0 provider name is added and it should be used in the connection string.

Check if SqlServerCompact provider is added to your web.config .

  <entityFramework>
    <defaultConnectionFactory type="System.Data.Entity.Infrastructure.SqlCeConnectionFactory, EntityFramework">
      <parameters>
        <parameter value="System.Data.SqlServerCe.4.0" />
      </parameters>
    </defaultConnectionFactory>
    <providers>
      <provider invariantName="System.Data.SqlClient" type="System.Data.Entity.SqlServer.SqlProviderServices, EntityFramework.SqlServer" />
      <provider invariantName="System.Data.SqlServerCe.4.0" type="System.Data.Entity.SqlServerCompact.SqlCeProviderServices, EntityFramework.SqlServerCompact" />
    </providers>
  </entityFramework>
  <system.data>
    <DbProviderFactories>
      <remove invariant="System.Data.SqlServerCe.4.0" />
      <add name="Microsoft SQL Server Compact Data Provider 4.0" invariant="System.Data.SqlServerCe.4.0" description=".NET Framework Data Provider for Microsoft SQL Server Compact" type="System.Data.SqlServerCe.SqlCeProviderFactory, System.Data.SqlServerCe, Version=4.0.0.0, Culture=neutral, PublicKeyToken=89845dcd8080cc91" />
    </DbProviderFactories>
  </system.data>

Answer 2

To prevent this you need to change your connection string to have:

 Trusted_Connection=False;Persist Security Info=True

based on below link

http://jayhollingum.blogspot.in/2011/03/ef-codefirst-databasesetinitializser.html

Answer 3

After many search, I decide to move to a near approach of SQL compact, it's LocalDB. I change it and this work:

<add name="QuanLyKhoContext" connectionString="Data Source=(LocalDB)\v11.0;
AttachDbFilename=|DataDirectory|MyDB.mdf;Integrated Security=True;Connect Timeout=60" providerName="System.Data.SqlClient" />

I think "System.Data.SqlClient" is a valid Provider because I am using Sql Express LocalDB :) It's not my first purpose, but it work anyway. Thanks all

I just don't know when deploy in window XP, do I need to install Sql Express or Sql Compact stuffs manually?

Answer 4

According to MSDN documentation you can use the following:

<add name="ConnectionStringName"
    providerName="System.Data.SqlServerCe.4.0"
    connectionString="Data Source=|DataDirectory|\DatabaseFileName.sdf" />

PS: How to install SQL Server Compact