| 1 |
=head1 NAME |
| 2 |
|
| 3 |
XML::DB - emulate a native xml database using DBI |
| 4 |
|
| 5 |
=head1 SYNOPSIS |
| 6 |
|
| 7 |
=head1 DESCRIPTION |
| 8 |
|
| 9 |
Ehrm... ;) |
| 10 |
|
| 11 |
=head1 FUNCTIONS |
| 12 |
|
| 13 |
=head1 SEE ALSO |
| 14 |
|
| 15 |
=head1 AUTHOR |
| 16 |
|
| 17 |
This perl extension was written by Marc Lehmann <pcg@goof.com> |
| 18 |
|
| 19 |
=head1 BUGS |
| 20 |
|
| 21 |
=cut |
| 22 |
|
| 23 |
package XML::DB; |
| 24 |
|
| 25 |
use XML::Parser; |
| 26 |
use PApp::SQL; |
| 27 |
|
| 28 |
#require Exporter; |
| 29 |
BEGIN { |
| 30 |
$VERSION = 0.01; |
| 31 |
|
| 32 |
use base DynaLoader; |
| 33 |
|
| 34 |
bootstrap XML::DB $VERSION; |
| 35 |
} |
| 36 |
|
| 37 |
sub new { |
| 38 |
my $class = shift; |
| 39 |
bless { @_ }, $class; |
| 40 |
} |
| 41 |
|
| 42 |
sub seq { |
| 43 |
sql_insertid sql_exec "update $_[0]_seq set n = last_insert_id(n + 1)"; |
| 44 |
} |
| 45 |
|
| 46 |
sub name_id { |
| 47 |
# not threadsafe |
| 48 |
sql_ufetch $_[0]{dbh}, "select i from name where n = ? and v = ?", "$_[1]", $_[2] |
| 49 |
or sql_insertid sql_exec $_[0]{dbh}, "insert into name values (NULL, ?, ?)", "$_[1]", $_[2]; |
| 50 |
|
| 51 |
} |
| 52 |
|
| 53 |
sub new_value { |
| 54 |
sql_insertid sql_exec $_[0]{dbh}, "insert into value values (NULL, ?)", $_[1]; |
| 55 |
} |
| 56 |
|
| 57 |
sub new_xml_insert_parser { |
| 58 |
my $self = shift; |
| 59 |
my $dbh = $self->{dbh}; |
| 60 |
|
| 61 |
my $did = 55; |
| 62 |
my $n = 1; |
| 63 |
|
| 64 |
my @l; |
| 65 |
my @attr; |
| 66 |
|
| 67 |
new XML::Parser |
| 68 |
Namespaces => 1, |
| 69 |
NoExpand => 1, |
| 70 |
Handlers => { |
| 71 |
Char => sub { |
| 72 |
sql_exec $dbh, "insert into node values (?, ?, ?, 'pcdata', ?)", |
| 73 |
$did, $n+1, $n+2, $self->new_value($_[1]); |
| 74 |
$n += 2; |
| 75 |
}, |
| 76 |
Start => sub { |
| 77 |
my ($parser, $element, @attrs) = @_; |
| 78 |
push @l, ++$n; |
| 79 |
push @attr, \@attrs; |
| 80 |
}, |
| 81 |
End => sub { |
| 82 |
my ($parser, $element) = @_; |
| 83 |
my $attr = pop @attr; |
| 84 |
my $l = pop @l; |
| 85 |
sql_exec $dbh, "insert into node values (?, ?, ?, 'element', ?)", |
| 86 |
$did, $l, ++$n, $self->name_id($parser->namespace($element), $element); |
| 87 |
|
| 88 |
for (my $i = 0; $i < @$attr; $i += 2) { |
| 89 |
sql_exec $dbh, "insert into attr values (?, ?, ?, ?)", |
| 90 |
$did, $l, $self->name_id($parser->namespace($attr->[$i]), $attr->[$i]), |
| 91 |
$self->new_value($attr->[$i+1]); |
| 92 |
} |
| 93 |
}, |
| 94 |
Final => sub { |
| 95 |
sql_exec $dbh, "insert into node values (?, ?, ?, 'root', 0)", |
| 96 |
$did, 1, ++$n; |
| 97 |
}, |
| 98 |
}, |
| 99 |
@_, |
| 100 |
; |
| 101 |
} |
| 102 |
|
| 103 |
sub get_fragment { |
| 104 |
my ($self, $did, $ol) = @_; |
| 105 |
|
| 106 |
$ol ||= 1; |
| 107 |
|
| 108 |
my $or = sql_fetch $self->{dbh}, "select r from node where did = ? and l = ?", $did, $ol; |
| 109 |
my $st = sql_exec $self->{dbh}, \my($l, $r, $t, $c), |
| 110 |
"select l, r, t, c from node where did = ? and l > ? and r < ? order by l", |
| 111 |
$did, $ol, $or; |
| 112 |
|
| 113 |
my $ot; |
| 114 |
my @stack; |
| 115 |
my $doc = ""; |
| 116 |
my %ns; |
| 117 |
my $nso; |
| 118 |
my $nsp = "a"; |
| 119 |
|
| 120 |
my $expand_name = sub { |
| 121 |
$ns{$_[0]} ||= $nsp++; |
| 122 |
}; |
| 123 |
|
| 124 |
while ($st->fetch) { |
| 125 |
if ($l > $or) { |
| 126 |
($ol, $or, $oc) = @{pop @stack}; |
| 127 |
|
| 128 |
$doc .= "</$oc>"; |
| 129 |
} |
| 130 |
|
| 131 |
if ($t eq "element") { |
| 132 |
my ($ns, $name) = $expand_name->(sql_ufetch $self->{dbh}, "select ns, v from name where i = ?", $c); |
| 133 |
push @stack, [$ol, $or, $ns]; |
| 134 |
($ol, $or) = ($l, $r); |
| 135 |
|
| 136 |
$doc .= "<$ns"; |
| 137 |
|
| 138 |
my $st = sql_exec $self->{dbh}, "select name.n, , v from |
| 139 |
} elsif ($t eq "pcdata") { |
| 140 |
$c = sql_ufetch $self->{dbh}, "select v from value where i = ?", $c; |
| 141 |
|
| 142 |
$doc .= "$c"; |
| 143 |
|
| 144 |
} elsif ($t eq "entity") { |
| 145 |
} elsif ($t eq "pi") { |
| 146 |
} elsif ($t eq "doctype") { |
| 147 |
} else { |
| 148 |
die "FATAL: database corrupt, unexpected nodetype '$t'"; |
| 149 |
} |
| 150 |
} |
| 151 |
|
| 152 |
$doc; |
| 153 |
} |
| 154 |
|
| 155 |
1; |
| 156 |
|
| 157 |
|
| 158 |
|
| 159 |
|
| 160 |
|
