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Re: Retriving BerkeleyDB Data

by roboticus (Chancellor)
on Aug 02, 2014 at 01:21 UTC ( #1095987=note: print w/replies, xml ) Need Help??


in reply to Retriving BerkeleyDB Data

hawk2379:

It sounds like you'll just need to use the unpack function (perldoc -f unpack) to pull the byte string apart into the fields you want. I'd guess it would be something like:

my ($datetime, $open, $high, $low, $close, $volume, $interest) = unpack "A14f5Q", $h{$key};

Note: Totally untested, but I think that if you play around with unpack you'll be able to pull it apart. (You'll want to check perldoc -f pack and perldoc perlpacktut as well.)

Update: changed variable names.

...roboticus

When your only tool is a hammer, all problems look like your thumb.

Replies are listed 'Best First'.
Re^2: Retriving BerkeleyDB Data
by hawk2379 (Novice) on Aug 02, 2014 at 02:40 UTC
    I was able to write up a rough script based on your recommendations. And it works!
    #!/usr/bin/perl use BerkeleyDB; print "start\n"; my $filename = '/home/user/Perl/AA'; #unlink $filename ; my %h ; my $dbh = tie %h, 'BerkeleyDB::Btree', -Filename => $filename, -Flags => DB_CREATE or die "Cannot open $filename $! $BerkeleyDB::Error" ; foreach $key (keys %h) { my ($open, $high, $low, $close, $volume, $interest) = unpack "dddddl", $h{$key}; print "$key: $open,$high,$low,$close,$volume,$interest\n"; # print "$h{$key}\n"; } untie %h; print "end\n";
    Thank You for your help.

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