anchor.diff:  %%            Sock   = term() "gen_tcp socket"
   %%            Packet = binary()
   %%            SeqNum = integer() "packet sequence number"
  -%%            LogFun = undefined | function() with arity 3
  +%%            LogFun = undefined | mysql_log_fun()
   %%
   %% @doc     Send a packet to the MySQL server.
   %% @end
  
positive.code: %%            User     = string()
  %%            Password = string()
  %%            Database = string()
  %%            LogFun   = undefined | function() of arity 3
  %%            Parent   = pid() of process starting this mysql_conn
  %%
  %% @doc     Connect to a MySQL server, log in and chooses a database.
  
negative.code: %%            {ok, FieldInfo} |
  %%            {error, Reason}
  %%
  %%            LogFun  = undefined | mysql_log_fun()
  %%            RecvPid = pid() "mysql_recv process"
  %%
  %%            FieldInfo = [term()]
  