Database Specific Migration Code [duplicate]

问题

I'm creating an application that needs to run under multiple databases. I currently have some code in a migration that I only want run under specific databases (postgresql and mysql). Any way of setting this up? Thanks.

回答1:

Your migration has access to a database connection in connection and the connection has an adapter_name method so you can just ask it what sort of connection it is:

def self.up
    case connection.adapter_name
    when 'PostgreSQL'
        # Do PostgreSQL stuff
    when 'MySQL'
        # Do MySQL stuff
    else
        # Blow up and catch on fire. Or silently ignore it depending on your needs.
    end
end

I'm not sure if I have the MySQL adapter name right but the technique is sound and you can easily check the MySQL adapter name yourself.

来源：https://stackoverflow.com/questions/6178303/database-specific-migration-code

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mysql