How do I implement this protocol in struct

I'm new to Swift and I want to create an abstract factory for db access. Here is my protocol

protocol IDAOFactory
{
  associatedtype DAO: IDAO

  func createAccountDAO<DAO: IAccountDAO>() -> DAO
}

struct RealmFactory: IDAOFactory
{

}

protocol IDAO
{
   associatedtype T
   func save(object: T)
}

protocol IAccountDAO : IDAO
{

}

struct AccountDAORealm: IAccountDAO
{

}

How to implement the IDAOFactory in struct RealmFactory and IAccountDAO in struct AccountDAORealm? Can anybody help?