Use MySQL and MSSQL in Entity Framework 6

Question

I'm developing a webservice.

Behind this service are two methods: One to get entities from a MySQL Connection and the other to get entities from a MSSQL Server Connection.

I have two connection strings.

I would like to have two contexts, they are completely separated.

But i'm not able to manage this.

Any ideas?

Daniel · Accepted Answer · 2015-07-09 10:20:35Z

6

The solution was simple in the end.

Be sure to install MySql Connector/Net on all target systems! I missed this on my target platform.

web.config / app.config:

<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>
  <connectionStrings>
    <add name="MsSqlServerContext" connectionString="MSSQLCONNECTIONSTRING" providerName="System.Data.SqlClient" />
    <add name="MySqlServerContext" connectionString="MYSQLCONNECTIONSTRING" providerName="MySql.Data.MySqlClient" />
  </connectionStrings>
  <entityFramework>
    <defaultConnectionFactory type="System.Data.Entity.Infrastructure.LocalDbConnectionFactory, EntityFramework">
      <parameters>
        <parameter value="mssqllocaldb" />
      </parameters>
    </defaultConnectionFactory>
    <providers>
      <provider invariantName="System.Data.SqlClient" type="System.Data.Entity.SqlServer.SqlProviderServices, EntityFramework.SqlServer" />
      <provider invariantName="MySql.Data.MySqlClient" type="MySql.Data.MySqlClient.MySqlProviderServices, MySql.Data.Entity.EF6" />
    </providers>
  </entityFramework>
</configuration>

MsSqlServerContext.cs

public partial class MsSqlServerContext : DbContext
{
    public MsSqlServerContext()
        : base("name=MsSqlServerContext")
    {
        Database.SetInitializer<MsSqlServerContext>(null);
    }

    // Add DbSets here
    public DbSet<ClassName1> SomeName1 { get; set; }
    public DbSet<ClassName2> SomeName2 { get; set; }

    protected override void OnModelCreating(DbModelBuilder modelBuilder)
    {
        // Add Mappings here
        modelBuilder.Configurations.Add(new ClassName1Map());
        modelBuilder.Configurations.Add(new ClassName2Map());
    }
}

MySqlServerContext

public partial class MySqlServerContext : DbContext
{
    public MySqlServerContext()
        : base("name=MySqlServerContext")
    {
        Database.SetInitializer<MySqlServerContext>(null);
    }

    public DbSet<ClassName3> SomeName3 { get; set; }
    public DbSet<ClassName4> SomeName4 { get; set; }

    protected override void OnModelCreating(DbModelBuilder modelBuilder)
    {
        modelBuilder.Configurations.Add(new ClassName3Map());
        modelBuilder.Configurations.Add(new ClassName4Map());
    }
}

answered Jul 9, 2015 at 10:20

Daniel

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3 Comments

Lorin Over a year ago

I am still getting "Keyword not supported. Parametername: multipleactiveresultsets" with those configurations. Somehow EF6 tries to use MySql provider.

Daniel Over a year ago

Double check the spellings! I struggled with typing issues. See all references of MySqlServerContext and MsSqlServerContext. That was my fault in the beginning

Lorin Over a year ago

I have solved this by creating DB-First EF6 datasource with vs2010. It uses other code generator(.edmx instead of t4 .tt files) so resulting code is different. And it works.

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