[aplusdev] Mapped files

[John.Mizel at morganstanley.com]

Hello Alexei,

You can store a nested object by calling sys.exp{}, which encodes it into
a character vector.  To convert it back into the nested object use
sys.imp{}.

i.e.

$mode ascii
"data.m" beam sys.exp{nested_variable}

nested_var := sys.imp{ beam "data.m" }

Note that I am using ascii mode for the above example.  Also, nested_var
is a regular variable and not attached to the file data.m.

API's for external facilities like databases is usually done using
dynamically loaded functions and the system function _dyld{}. See "C
Subroutines" under Extensions and Tools in the manual.

Thanks,
John


On Wed, 29 Aug 2001, Alexei Zalivine wrote:

> Hello,
>
> I want to store nested matrix like this:
>
> 1 'Lesha' 10 'Mandrake'
> 2 'Sasha' 15 'SuSE'
> 3 'Dima' 5 'RedHat'
> I try to use the mapped file for it and get the "type" error. From manual I
> understand that I can store only simple character or numeric array. Is there
> the way to store nested data? Native file not acceptable for me.
>
> Regards,
> Alexei.
>
> P.S. Anybody can use the DB like Postgres or Interbase from A+?
>
>