SQLite Forum: Converting from sqlite to sqlite3

Hi,

I'm converting a piece of code from sqlite to sqlite3.
I have a few questions:

1) When creating a db you use to be able to pass a setup string. Is this no longer a thing in sqlite3?:
For example, 
    sql::db database (db_file, setup_str);

2) What happened to transactions? I use to have to call begin_transaction().
For example,
    auto transaction (database.begin_transaction());
    transaction.commit();

Thanks,
-Phil