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GDBM.pm
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GDBM.pm
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# Table/GDBM.pm: access a table stored in a GDBM file
#
# $Id: GDBM.pm,v 1.11 1999/02/15 08:51:50 mike Exp mike $
#
# Copyright 1995 by Andrew M. Wilcox <awilcox@world.std.com>
# Copyright 1996-1999 by Mike Heins <mikeh@minivend.com>
#
# 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
# (at your option) 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., 675 Mass Ave, Cambridge, MA 02139, USA.
package Vend::Table::GDBM;
$VERSION = substr(q$Revision: 1.11 $, 10);
use strict;
use GDBM_File;
use vars qw($Storable);
# See if we can do Storable
BEGIN {
eval {
die unless $ENV{MINIVEND_STORABLE_DB};
require Storable;
$Storable = 1;
};
}
my @Hex_string;
{
my $i;
foreach $i (0..255) {
$Hex_string[$i] = sprintf("%%%02X", $i);
}
}
sub stuff {
my ($val) = @_;
$val =~ s,([\t\%]),$Hex_string[ord($1)],eg;
return $val;
}
sub unstuff {
my ($val) = @_;
$val =~ s,%(..),chr(hex($1)),eg;
return $val;
}
# 0: filename
# 1: column names
# 2: column index
# 3: tie hash
# 4: dbm object
# 5: configuration
my ($FILENAME, $COLUMN_NAMES, $COLUMN_INDEX, $TIE_HASH, $DBM, $CONFIG) = (0 .. 5);
sub config {
my ($self, $key, $value) = @_;
return $self->[$CONFIG]{$key} unless defined $value;
$self->[$CONFIG]{$key} = $value;
}
sub create {
my ($class, $config, $columns, $filename) = @_;
$config = {} unless defined $config;
my ($File_permission_mode, $Fast_write)
= @$config{'File_permission_mode', 'Fast_write'};
$File_permission_mode = 0666 unless defined $File_permission_mode;
$Fast_write = 1 unless defined $Fast_write;
die "columns argument $columns is not an array ref\n"
unless ref($columns) eq 'ARRAY';
# my $column_file = "$filename.columns";
# my @columns = @$columns;
# open(COLUMNS, ">$column_file")
# or die "Couldn't create '$column_file': $!";
# print COLUMNS join("\t", @columns), "\n";
# close(COLUMNS);
my $column_index = {};
my $i;
for ($i = 0; $i < @$columns; ++$i) {
$column_index->{$columns->[$i]} = $i;
}
my $tie = {};
my $flags = GDBM_NEWDB;
$flags |= GDBM_FAST if $Fast_write;
my $dbm = tie(%$tie, 'GDBM_File', $filename, $flags, $File_permission_mode)
or die "Could not create '$filename': $!";
$tie->{'c'} = join("\t", @$columns);
my $self = [$filename, $columns, $column_index, $tie, $dbm, $config];
bless $self, $class;
}
sub open_table {
my ($class, $config, $filename) = @_;
my ($Fast_write, $Read_only) = @$config{'Fast_write', 'Read_only'};
my $tie = {};
my $flags = GDBM_WRITER;
if ($Read_only) {
$flags = GDBM_READER;
}
else {
$flags |= GDBM_FAST if $Fast_write;
}
my $dbm;
my $failed = 0;
while( $failed < 10 ) {
$dbm = tie(%$tie, 'GDBM_File', $filename, $flags, 0600)
and undef($failed), last;
$failed++;
select(undef,undef,undef,$failed * .100);
}
die("Could not tie to '$filename': $!")
if $failed;
my $columns = [split(/\t/, $tie->{'c'})];
my $column_index = {};
my $i;
for ($i = 0; $i < @$columns; ++$i) {
$column_index->{$columns->[$i]} = $i;
}
my $self = [$filename, $columns, $column_index, $tie, $dbm, $config];
bless $self, $class;
}
sub close_table {
my ($s) = @_;
splice(@$s, $DBM, 1);
my $ref = splice(@$s, $TIE_HASH, 1);
untie %$ref or die "Could not close GDBM table $s->[$FILENAME]: $!\n";
}
sub columns {
my ($s) = @_;
return @{$s->[$COLUMN_NAMES]};
}
sub test_column {
my ($s, $column) = @_;
return $s->[$COLUMN_INDEX]{$column};
}
sub column_index {
my ($s, $column) = @_;
my $i = $s->[$COLUMN_INDEX]{$column};
die "There is no column named '$column'" unless defined $i;
return $i;
}
sub row_hash {
my ($s, $key) = @_;
my %row;
@row{ @{$s->[$COLUMN_NAMES]} } = $s->row($key);
return \%row;
}
sub unstuff_row {
my ($s, $key) = @_;
my $line = $s->[$TIE_HASH]{"k$key"};
die "There is no row with index '$key'" unless defined $line;
return map(unstuff($_), split(/\t/, $line, 9999));
}
sub thaw_row {
my ($s, $key) = @_;
my $line = $s->[$TIE_HASH]{"k$key"};
die "There is no row with index '$key'" unless defined $line;
return @{ Storable::thaw($line) };
}
sub field_accessor {
my ($self, $column) = @_;
my $index = $self->column_index($column);
return sub {
my ($key) = @_;
return ($self->row($key))[$index];
};
}
sub field_settor {
my ($self, $column) = @_;
my $index = $self->column_index($column);
return sub {
my ($key, $value) = @_;
my @row = $self->row($key);
$row[$index] = $value;
$self->set_row($key, @row);
};
}
sub stuff_row {
my ($s, $key, @fields) = @_;
my $line = join("\t", map(stuff($_), @fields));
$s->[$TIE_HASH]{"k$key"} = $line;
}
sub freeze_row {
my ($s, $key, @fields) = @_;
$s->[$TIE_HASH]{"k$key"} = Storable::freeze(\@fields);
}
if($Storable) {
*set_row = \&freeze_row;
*row = \&thaw_row;
}
else {
*set_row = \&stuff_row;
*row = \&unstuff_row;
}
sub field {
my ($s, $key, $column) = @_;
return ($s->row($key))[$s->column_index($column)];
}
sub set_field {
my ($s, $key, $column, $value) = @_;
my @row = $s->row($key);
$row[$s->column_index($column)] = $value;
$s->set_row($key, @row);
$value;
}
sub inc_field {
my ($s, $key, $column, $adder) = @_;
my($value);
my @row = $s->row($key);
$value = $row[$s->column_index($column)] += $adder;
$s->set_row($key, @row);
$value;
}
sub touch {
my ($s) = @_;
my $now = time();
utime $now, $now, $s->[$FILENAME];
}
sub ref {
return $_[0];
}
sub each_record {
my ($s) = @_;
my $key;
for (;;) {
$key = each %{$s->[3]};
if (defined $key) {
if ($key =~ s/^k//) {
return ($key, $s->row($key));
}
}
else {
return ();
}
}
}
sub record_exists {
my ($s, $key) = @_;
# guess what? The GDBM "exists" function got renamed to "EXISTS"
# in 5.002.
my $r = $s->[$DBM]->EXISTS("k$key");
return $r;
}
*test_record = \&record_exists;
sub delete_record {
my ($s, $key) = @_;
delete $s->[$TIE_HASH]{"k$key"};
1;
}
sub version { $Vend::Table::GDBM::VERSION }
1;