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Re: use SDBM_File like a database

by hiseldl (Priest)
on Dec 03, 2003 at 21:20 UTC ( #312016=note: print w/replies, xml ) Need Help??

in reply to use SDBM_File like a database

If you can use Storable you can try the following:

#!/usr/local/bin/perl -w use strict; use Fcntl; # For O_RDWR, O_CREAT, etc. use SDBM_File; use Storable qw/freeze thaw/; ... sub insert { my $table_name = shift; my $col_vals = shift; # ref to hash my %h; tie(%h, 'SDBM_File', $table_name, O_WRONLY , 0666) or die "Couldn't tie SDBM file $table_name: $!; aborting"; $h{$col_vals->{REQ}} = freeze $col_vals; untie %h; } sub select_all { my $table_name = shift; my %h; tie(%h, 'SDBM_File', $table_name, O_RDONLY , 0666) or die "Couldn't tie SDBM file $table_name: $!; aborting"; for my $i ( keys %h ) { my $row = thaw $h{$i}; print $i," -> "; while (my ($key,$val) = each %$row) { $val = 'undef' unless $val; print "\t", $key, ' = ', $val, "\n"; } } } ...
this uses the value of the key 'REQ' as the primary key, and then freezes the hash so it can be stored in the SDBM_File. The select_all sub uses thaw to deserialize the hash into a hash ref containing the 'row' of values.


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[Corion]: Two-way data binding means that if you change something in a text box, the corresponding variable in your Javascript gets updated immediately as well, and if you then change the variable, the corresponding text box also gets updated
[Corion]: That is a horrible approach that was also taken by Access, but if you have hooks that prevent automatic saving to the database, it is incredibly handy

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