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use Data::Dumper; |
use Data::Dumper; |
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our $VERSION = '0.03'; |
our $VERSION = '0.05'; |
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=head1 NAME |
=head1 NAME |
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use Fuse::DBI; |
use Fuse::DBI; |
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Fuse::DBI->mount( ... ); |
Fuse::DBI->mount( ... ); |
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See C<run> below for examples how to set parametars. |
See C<run> below for examples how to set parameters. |
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=head1 DESCRIPTION |
=head1 DESCRIPTION |
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This module will use C<Fuse> module, part of C<FUSE (Filesystem in USErspace)> |
This module will use C<Fuse> module, part of C<FUSE (Filesystem in USErspace)> |
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available at L<http://sourceforge.net/projects/avf> to mount |
available at L<http://fuse.sourceforge.net/> to mount |
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your database as file system. |
your database as file system. |
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That will give you posibility to use normal file-system tools (cat, grep, vi) |
That will give you possibility to use normal file-system tools (cat, grep, vi) |
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to manipulate data in database. |
to manipulate data in database. |
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It's actually opposite of Oracle's intention to put everything into database. |
It's actually opposite of Oracle's intention to put everything into database. |
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Mount your database as filesystem. |
Mount your database as filesystem. |
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Let's suppose that your database have table C<files> with following structure: |
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id: int |
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filename: text |
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size: int |
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content: text |
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writable: boolean |
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Following is example how to mount table like that to C</mnt>: |
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my $mnt = Fuse::DBI->mount({ |
my $mnt = Fuse::DBI->mount({ |
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filenames => 'select name from files_table as filenames', |
'filenames' => 'select id,filename,size,writable from files', |
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read => 'sql read', |
'read' => 'select content from files where id = ?', |
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update => 'sql update', |
'update' => 'update files set content = ? where id = ?', |
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dsn => 'DBI:Pg:dbname=webgui', |
'dsn' => 'DBI:Pg:dbname=test_db', |
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user => 'database_user', |
'user' => 'database_user', |
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password => 'database_password' |
'password' => 'database_password', |
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'invalidate' => sub { ... }, |
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}); |
}); |
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Options: |
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=over 5 |
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=item filenames |
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SQL query which returns C<id> (unique id for that row), C<filename>, |
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C<size> and C<writable> boolean flag. |
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=item read |
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SQL query which returns only one column with content of file and has |
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placeholder C<?> for C<id>. |
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=item update |
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SQL query with two pace-holders, one for new content and one for C<id>. |
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=item dsn |
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C<DBI> dsn to connect to (contains database driver and name of database). |
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=item user |
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User with which to connect to database |
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=item password |
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Password for connecting to database |
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=item invalidate |
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Optional anonymous code reference which will be executed when data is updated in |
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database. It can be used as hook to delete cache (for example on-disk-cache) |
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which is created from data edited through C<Fuse::DBI>. |
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=item fork |
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Optional flag which forks after mount so that executing script will continue |
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running. Implementation is experimental. |
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=back |
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=cut |
=cut |
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my $dbh; |
my $dbh; |
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my $pid; |
my $pid; |
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if ($arg->{'fork'}) { |
if ($arg->{'fork'}) { |
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$self->{'mounted'} = 1; |
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$pid = fork(); |
$pid = fork(); |
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die "fork() failed: $!" unless defined $pid; |
die "fork() failed: $!" unless defined $pid; |
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# child will return to caller |
# child will return to caller |
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$self->{'read_filenames'} = sub { $self->read_filenames }; |
$self->{'read_filenames'} = sub { $self->read_filenames }; |
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$self->read_filenames; |
$self->read_filenames; |
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$self->{'mounted'} = 1; |
$self->{'mounted'} = 1 unless ($arg->{'fork'}); |
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$fuse_self = \$self; |
$fuse_self = \$self; |
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my $self = shift; |
my $self = shift; |
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if ($self->{'mounted'}) { |
if ($self->{'mounted'}) { |
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system "fusermount -u ".$self->{'mount'} || croak "umount error: $!"; |
system "fusermount -u ".$self->{'mount'} || warn "umount error: $!" && return 0; |
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} |
} |
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return 1; |
return 1; |
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die "no fuse module loaded in kernel" |
die "no fuse module loaded in kernel" |
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unless (Fuse::DBI::fuse_module_loaded); |
unless (Fuse::DBI::fuse_module_loaded); |
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This function in called by L<mount>, but might be useful alone also. |
This function in called by C<mount>, but might be useful alone also. |
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=cut |
=cut |
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my %out; |
my %out; |
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foreach my $f (sort keys %files) { |
foreach my $f (sort keys %files) { |
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if ($dirname) { |
if ($dirname) { |
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if ($f =~ s/^\E$dirname\Q\///) { |
if ($f =~ s/^\Q$dirname\E\///) { |
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$out{$f}++ if ($f =~ /^[^\/]+$/); |
$out{$f}++ if ($f =~ /^[^\/]+$/); |
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} |
} |
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} else { |
} else { |
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$sth->{'read'}->execute($id) || die $sth->{'read'}->errstr; |
$sth->{'read'}->execute($id) || die $sth->{'read'}->errstr; |
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$files{$file}{cont} = $sth->{'read'}->fetchrow_array; |
$files{$file}{cont} = $sth->{'read'}->fetchrow_array; |
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$files{$file}{ctime} = time(); |
# I should modify ctime only if content in database changed |
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#$files{$file}{ctime} = time() unless ($files{$file}{ctime}); |
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print "file '$file' content [",length($files{$file}{cont})," bytes] read in cache\n"; |
print "file '$file' content [",length($files{$file}{cont})," bytes] read in cache\n"; |
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} |
} |
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print "invalidate all cached content\n"; |
print "invalidate all cached content\n"; |
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foreach my $f (keys %files) { |
foreach my $f (keys %files) { |
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delete $files{$f}{cont}; |
delete $files{$f}{cont}; |
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delete $files{$f}{ctime}; |
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} |
} |
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print "begin new transaction\n"; |
print "begin new transaction\n"; |
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#$dbh->begin_work || die $dbh->errstr; |
#$dbh->begin_work || die $dbh->errstr; |
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=head1 SEE ALSO |
=head1 SEE ALSO |
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C<FUSE (Filesystem in USErspace)> website |
C<FUSE (Filesystem in USErspace)> website |
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L<http://sourceforge.net/projects/avf> |
L<http://fuse.sourceforge.net/> |
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Example for WebGUI which comes with this distribution in |
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directory C<examples/webgui.pl>. It also contains a lot of documentation |
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about design of this module, usage and limitations. |
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=head1 AUTHOR |
=head1 AUTHOR |
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