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Jeffrey Cohen > Genezzo > Genezzo::Index::btHash

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NAME ^

Genezzo::Index::btHash - btree Hash tied hash class. Makes a persistent btree based upon Genezzo::Block::RDBlock look like a conventional hash.

SYNOPSIS ^

 use Genezzo::Index::btHash;

 my %tied_hash = ();

 my $tie_val = 
     tie %tied_hash, 'Genezzo::Index::btHash';

DESCRIPTION ^

btHash is a wrapper for Genezzo::Index::bt2, a btree class based upon Genezzo::Block::RDBlock. The tied hash is functionally complete, but not particularly efficient in some cases due to the "impedance mismatch" between the hash, btree and underlying RDBlock implementation.

FUNCTIONS ^

EXPORT

TODO ^

figure out whether should be a pushhash, hash, or rowsource
SQLPrepare/Execute/Fetch: clean up. Shouldn't need to manage a distinction between using btHash as a row source and the old bt2 api. bt2 is wrong - should only have one Fetch style. Should be able to use the index start/stop key vs filtering.
NEXTKEY: broken in "dump tsidx" for case where create 2 tables, insert some rows, then drop the first table (and don't COMMIT) and call dump tsidx. Loops in NEXTKEY - never terminates for allfileused index.
Add ReadOnly mode so can view indexes, but not insert/update/delete.

AUTHOR ^

Jeffrey I. Cohen, jcohen@genezzo.com

SEE ALSO ^

perl(1).

Copyright (c) 2003, 2004 Jeffrey I Cohen. All rights reserved.

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program; if not, write to the Free Software
    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA

Address bug reports and comments to: jcohen@genezzo.com

For more information, please visit the Genezzo homepage at http://www.genezzo.com

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