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=head1 NAME |
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XML::DB - emulate a native xml database using DBI |
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=head1 SYNOPSIS |
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=head1 DESCRIPTION |
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|
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Ehrm... ;) |
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=head1 FUNCTIONS |
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=head1 SEE ALSO |
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=head1 AUTHOR |
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This perl extension was written by Marc Lehmann <pcg@goof.com> |
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=head1 BUGS |
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=cut |
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package XML::DB; |
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|
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use XML::Parser; |
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use PApp::SQL; |
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|
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#require Exporter; |
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BEGIN { |
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$VERSION = 0.01; |
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|
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use base DynaLoader; |
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|
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bootstrap XML::DB $VERSION; |
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} |
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|
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sub new { |
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my $class = shift; |
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bless { @_ }, $class; |
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} |
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|
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sub seq { |
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sql_insertid sql_exec "update $_[0]_seq set n = last_insert_id(n + 1)"; |
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} |
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|
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sub name_id { |
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# not threadsafe |
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sql_ufetch $_[0]{dbh}, "select i from name where n = ? and v = ?", "$_[1]", $_[2] |
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or sql_insertid sql_exec $_[0]{dbh}, "insert into name values (NULL, ?, ?)", "$_[1]", $_[2]; |
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|
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} |
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|
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sub new_xml_insert_parser { |
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my $self = shift; |
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my $dbh = $self->{dbh}; |
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|
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my $did = 55; |
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my $max = 1 + sql_fetch $dbh, "select max(l) from node"; |
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my $n = $max; |
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my @l; |
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my @attr; |
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|
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new XML::Parser |
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Namespaces => 1, |
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NoExpand => 1, |
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Handlers => { |
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Comment => sub { |
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++$n; |
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sql_exec $dbh, "insert into node values (?, ?, 'comment', NULL)", |
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$n, $n+1; |
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sql_exec $dbh, "insert into value values (?, ?)", |
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$n, $_[1]; |
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++$n; |
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}, |
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Char => sub { |
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++$n; |
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sql_exec $dbh, "insert into node values (?, ?, 'pcdata', NULL)", |
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$n, $n+1; |
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sql_exec $dbh, "insert into value values (?, ?)", |
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$n, $_[1]; |
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++$n; |
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}, |
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Start => sub { |
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my ($parser, $element, @attrs) = @_; |
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push @l, ++$n; |
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push @attr, \@attrs; |
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}, |
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End => sub { |
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my ($parser, $element) = @_; |
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my $attr = pop @attr; |
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my $l = pop @l; |
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sql_exec $dbh, "insert into node values (?, ?, 'element', ?)", |
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$l, ++$n, $self->name_id($parser->namespace($element), $element); |
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|
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for (my $i = 0; $i < @$attr; $i += 2) { |
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sql_exec $dbh, "insert into attr values (?, ?, ?)", |
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$l, $self->name_id($parser->namespace($attr->[$i]), $attr->[$i]), |
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$attr->[$i+1]; |
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} |
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}, |
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Final => sub { |
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sql_exec $dbh, "insert into node values (?, ?, 'root', NULL)", |
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$max*1, ++$n; |
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}, |
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}, |
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@_, |
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; |
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} |
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sub get_fragment { |
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my ($self, $ol) = @_; |
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my $or = sql_fetch $self->{dbh}, "select r from node where l = ?", $ol; |
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my $st = sql_exec $self->{dbh}, \my($l, $r, $t, $ns, $name, $value), |
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"select node.l, node.r, node.t, name.n, name.v, value.v |
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from node left join name on (node.n = name.i) |
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left join value on (node.l = value.l) |
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where node.l > ? and node.r < ? order by node.l", |
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$ol, $or; |
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|
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my $ot; |
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my @stack; |
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my $doc = ""; |
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my (%nsp, $nsps, $nso); |
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my $nsp = "a"; |
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|
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my $expand_name = sub { |
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$_[0] ? ($nsp{$_[0]} ||= do { |
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$nsps .= " xmlns:$nsp='$_[0]'"; |
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$nsp++; |
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}) . ":$_[1]" |
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: $_[1]; |
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}; |
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|
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while ($st->fetch) { |
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if ($l > $or) { |
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($ol, $or, $oc) = @{pop @stack}; |
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|
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$doc .= "</$oc>"; |
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} |
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if ($t eq "element") { |
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push @stack, [$ol, $or, $name]; |
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($ol, $or) = ($l, $r); |
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$doc .= "<" . $expand_name->($ns, $name); |
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$nso ||= length $doc; |
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my $st = sql_exec $self->{dbh}, \my($ns, $name, $value), |
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"select name.n, name.v, attr.v |
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from attr inner join name on (attr.k = name.i) |
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where attr.l = ?", |
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$l; |
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while ($st->fetch) { |
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$doc .= " " . $expand_name->($ns, $name) . "='" . $value ."'"; |
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} |
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$doc .= ">"; |
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} elsif ($t eq "pcdata" or $t eq "comment") { |
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$doc .= $value; |
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} elsif ($t eq "entity") { |
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} elsif ($t eq "pi") { |
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} elsif ($t eq "doctype") { |
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} else { |
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die "FATAL: database corrupt, unexpected nodetype '$t'"; |
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} |
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} |
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substr $doc, $nso, 0, $nsps; |
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$doc; |
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} |
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1; |
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