How to Establish a Dynamic MySQL Connection with Entity Framework 6?

Dynamic MySQL Connection with Entity Framework 6

Connecting to a dynamic database name using Entity Framework 6 involves certain considerations.

Getting MySQL Compatibility

• Install the MySQL .Net Connector 6.8.1.
• Reference Mysql.Data.dll and Mysql.Data.Entity.EF6.dll.
• Include the connection string and provider in Web.config:

<connectionStrings>
  <add name="mysqlCon" connectionString="Server=localhost;Database={0};Uid=username;Pwd=password" providerName="MySql.Data.MySqlClient" />
</connectionStrings>

<entityFramework>
  <defaultConnectionFactory type="MySql.Data.Entity.MySqlConnectionFactory, MySql.Data.Entity.EF6" />
  <providers>
    <provider invariantName="MySql.Data.MySqlClient" type="MySql.Data.MySqlClient.MySqlProviderServices, MySql.Data.Entity.EF6" />
  </providers>
</entityFramework>

Dynamic Database Connection

• Create a helper method to build the connection string with a placeholder for the database name:

public static string GetConnectionString(string dbName)
{
    var connString = ConfigurationManager.ConnectionStrings["mysqlCon"].ConnectionString.ToString();
    return String.Format(connString, dbName);
}

• Modify the ApplicationDbContext class:

public class ApplicationDbContext : DbContext
{
    public ApplicationDbContext(string dbName) : base(GetConnectionString(dbName))
    {
    }
}

• Usage:

ApplicationDbContext db = new ApplicationDbContext("dbName");

Note: If using database migrations, add a factory class to pass the database name in the seed method:

public class MigrationsContextFactory : IDbContextFactory<ApplicationDbContext>
{
    public ApplicationDbContext Create()
    {
        return new ApplicationDbContext("developmentdb");
    }
}

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