Re^2: can't manage to use BerkeleyDB::Env

Ok. Well, to tell the whole story I only used DB_File in this simple example.

The thing is that I already have a db which I know has an environnement in it (I've already opened it with an other perl program). What I wanted to do was to retrieve some data from its Env, so I wanted to explore a bit the structure of an BerkeleyDB::Env class.

So I tried to create a "detached" env:

use BerkeleyDB;
my $env = new BerkeleyDB::Env -Home => "/tmp"
    or die "could not create env";
[download]

And then I do raise the "could not create" exception.

Shouldn't it be possible to create a brand new environnement, detached from any database?

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Re^3: can't manage to use BerkeleyDB::Env by Anonymous Monk on Aug 23, 2012 at 10:45 UTC
Well, according to the docs, it is, provided you follow the docs (use flags) `#!/usr/bin/perl -- use strict; use warnings; use Data::Dump; use BerkeleyDB; for my $opts ( [], [-Flags => DB_CREATE\| DB_INIT_CDB \| DB_INIT_MPOOL] + ){ my $env = BerkeleyDB::Env->new( -Home => './home', @$opts, ) or warn "cannot open environment: $BerkeleyDB::Error\n"; dd $env, [ glob './home/*' ]; } __END__` [download] On first run it doesn't exist, so first try, without flags, fails -- you need flags to initialize `$ perl berkeleydb.env.pl cannot open environment: No such file or directory (undef, []) ( bless([12346044], "BerkeleyDB::Env"), [ "./home/__db.001", "./home/__db.002", "./home/__db.003", "./home/__db.004", ], )` [download] On second run both tries work, because its already initialized `$ perl berkeleydb.env.pl ( bless([10087228], "BerkeleyDB::Env"), [ "./home/__db.001", "./home/__db.002", "./home/__db.003", "./home/__db.004", ], ) ( bless([12336228], "BerkeleyDB::Env"), [ "./home/__db.001", "./home/__db.002", "./home/__db.003", "./home/__db.004", ], )` [download]	[reply] [d/l] [select]
Re^4: can't manage to use BerkeleyDB::Env by grondilu (Friar) on Aug 23, 2012 at 10:54 UTC
Ok, thanks. I was mis-leaded by the following statement in the BerkeleyDB man page: Ť All the parameters to the BerkeleyDB::Env constructor are optional. ť Well, not so true then.	[reply]
Re^5: can't manage to use BerkeleyDB::Env by Anonymous Monk on Aug 23, 2012 at 11:24 UTC
Well, not so true then. :) Well sure its true :) its just that success isn't guaranteed -- its like open, even filename is optional, but it doesn't mean you'll open a file	[reply]


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