How to Connect to a Dynamic Database Name in Entity Framework 6 with MySQL?

Dynamic Database Connection in Entity Framework 6 for MySQL

Configuring MySQL for Entity Framework 6

To establish a connection between Entity Framework 6 and MySQL, follow these steps:

• Install MySQL .Net Connector 6.8.1 (Beta) from MySQL's official website.
• Reference Mysql.Data.dll and Mysql.Data.Entity.EF6.dll in your Visual Studio solution.
• Copy these files to your project's bin directory for accessibility during build time.
• Add a connection string to your Web.config file, ensuring it includes the providerName attribute:

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

• Add the following provider information inside the node in your Web.config file:

<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>

• Remove the nodes from the node if you have changed it from the default.

Connecting to a Dynamic Database Name

• Update the connection string in Web.config to include a placeholder for the database name:

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

• Modify the ApplicationDbContext class as follows:

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

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

• Handle database migrations by adding a MigrationsContextFactory class at the end of your context class:

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

This allows you to pass a dynamic connection string to the entity framework context, enabling you to easily switch between multiple identical database schemas based on account.

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