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  $status = $accessor->query('query string');

Send the query string to the server and return a true value if
successful.  You must then call read() repeatedly in order to fetch
the query result.

=head2 read()

Read the result from the last query sent to the server and return it
as a string.  ACE may return the result in pieces, breaking between
whole objects.  You may need to read repeatedly in order to fetch the
entire result.  Canonical example:

  $accessor->query("find Sequence D*");
  die "Got an error ",$accessor->error() if $accessor->status == STATUS_ERROR;
  while ($accessor->status == STATUS_PENDING) {
     $result .= $accessor->read;
  }

=head2 low_read()

Read whatever data's available, or undef if none.  This is only used
by the ace.pl replacement for giface/tace.

=head2 status()

Return the status code from the last operation.  Status codes are
exported by default when you B<use> Ace.pm.  The status codes you may
see are:

  STATUS_WAITING    The server is waiting for a query.
  STATUS_PENDING    A query has been sent and Ace is waiting for
                    you to read() the result.
  STATUS_ERROR      A communications or syntax error has occurred

=head2 error()

May return a more detailed error code supplied by Ace.  Error checking
is not fully implemented.

=head2 encore()

This method will return true after you have performed one or more
read() operations, and indicates that there is more data to read.
B<encore()> is functionally equivalent to:

   $encore = $accessor->status == STATUS_PENDING;

In fact, this is how it's implemented.

=head2 auto_save()

Sets or queries the I<auto_save> variable.  If true, the "save"
command will be issued automatically before the connection to the
database is severed.  The default is true.

Examples:

   $accessor->auto_save(1);
   $flag = $accessor->auto_save;

=head1 SEE ALSO

L<Ace>, L<Ace::Object>, L<Ace::Iterator>, L<Ace::Model>

=head1 AUTHOR

Lincoln Stein <lstein@w3.org> with extensive help from Jean
Thierry-Mieg <mieg@kaa.crbm.cnrs-mop.fr>

Copyright (c) 1997-1998, Lincoln D. Stein

This library is free software; you can redistribute it and/or modify
it under the same terms as Perl itself.  See DISCLAIMER.txt for
disclaimers of warranty.

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