| 1 | ###########################################################################
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| 2 | #
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| 3 | # DBPlugin.pm -- plugin to import records from a database
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| 4 | #
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| 5 | # A component of the Greenstone digital library software
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| 6 | # from the New Zealand Digital Library Project at the
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| 7 | # University of Waikato, New Zealand.
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| 8 | #
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| 9 | # Copyright (C) 2003 New Zealand Digital Library Project
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| 10 | #
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| 11 | # This program is free software; you can redistribute it and/or modify
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| 12 | # it under the terms of the GNU General Public License as published by
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| 13 | # the Free Software Foundation; either version 2 of the License, or
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| 14 | # (at your option) any later version.
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| 15 | #
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| 16 | # This program is distributed in the hope that it will be useful,
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| 17 | # but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 18 | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 19 | # GNU General Public License for more details.
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| 20 | #
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| 21 | # You should have received a copy of the GNU General Public License
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| 22 | # along with this program; if not, write to the Free Software
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| 23 | # Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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| 24 | #
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| 25 | ###########################################################################
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| 26 |
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| 27 | # A plugin that imports records from a database. This uses perl's DBI module,
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| 28 | # which includes back-ends for mysql, postgresql, comma separated values (CSV),
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| 29 | # MS Excel, ODBC, sybase, etc... Extra modules may need to be installed to
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| 30 | # use this. See <GSDLHOME>/etc/packages/example.dbi for an example config file.
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| 31 | #
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| 32 |
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| 33 | # Written by John McPherson for the NZDL project
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| 34 | # Mar, Apr 2003
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| 35 |
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| 36 | package DBPlugin;
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| 37 |
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| 38 | use strict;
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| 39 | no strict 'refs'; # allow variable as a filehandle
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| 40 |
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| 41 | use AutoExtractMetadata;
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| 42 | use unicode;
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| 43 |
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| 44 | sub BEGIN {
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| 45 | @DBPlugin::ISA = ('AutoExtractMetadata');
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| 46 | }
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| 47 |
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| 48 | my $arguments =
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| 49 | [ { 'name' => "process_exp",
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| 50 | 'desc' => "{AutoExtractMetadata.process_exp}",
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| 51 | 'type' => "regexp",
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| 52 | 'deft' => &get_default_process_exp(),
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| 53 | 'reqd' => "no" }];
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| 54 |
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| 55 | my $options = { 'name' => "DBPlugin",
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| 56 | 'desc' => "{DBPlugin.desc}",
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| 57 | 'abstract' => "no",
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| 58 | 'inherits' => "yes",
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| 59 | 'args' => $arguments };
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| 60 |
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| 61 | sub new {
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| 62 | my ($class) = shift (@_);
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| 63 | my ($pluginlist,$inputargs,$hashArgOptLists) = @_;
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| 64 | push(@$pluginlist, $class);
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| 65 |
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| 66 | push(@{$hashArgOptLists->{"ArgList"}},@{$arguments});
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| 67 | push(@{$hashArgOptLists->{"OptList"}},$options);
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| 68 |
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| 69 | my $self = new AutoExtractMetadata($pluginlist, $inputargs, $hashArgOptLists);
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| 70 |
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| 71 | return bless $self, $class;
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| 72 | }
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| 73 |
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| 74 | sub get_default_process_exp {
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| 75 | my $self = shift (@_);
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| 76 |
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| 77 | return q^(?i)\.dbi$^;
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| 78 | }
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| 79 |
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| 80 | sub read {
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| 81 | my $self = shift (@_);
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| 82 | my ($pluginfo, $base_dir, $file, $metadata, $processor, $maxdocs,$total_count,$gli) = @_;
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| 83 |
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| 84 | #see if we can handle the passed file...
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| 85 | my ($block_status,$filename) = $self->read_block(@_);
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| 86 | return $block_status if ((!defined $block_status) || ($block_status==0));
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| 87 |
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| 88 | my $outhandle = $self->{'outhandle'};
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| 89 | my $verbosity = $self->{'verbosity'};
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| 90 |
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| 91 | print $outhandle "DBPlugin: processing $file\n"
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| 92 | if $self->{'verbosity'} > 1;
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| 93 |
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| 94 | require DBI; # database independent stuff
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| 95 |
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| 96 | # calculate the document hash, for document ids
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| 97 | my $hash="0";
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| 98 |
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| 99 |
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| 100 | # default options - may be overridden by config file
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| 101 | my $language=undef;
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| 102 | my $encoding=undef;
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| 103 | my $dbplug_debug=0;
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| 104 | my $username='';
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| 105 | my $password='';
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| 106 |
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| 107 | # these settings must be set by the config file:
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| 108 | my $db=undef;
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| 109 |
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| 110 | # get id of pages from "nonempty", get latest version number from
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| 111 | # "recent", and then get pagename from "page" and content from "version" !
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| 112 |
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| 113 | my $sql_query_prime = undef ;
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| 114 | my $sql_query = undef ;
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| 115 |
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| 116 | my %db_to_greenstone_fields=();
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| 117 | my %callbacks=();
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| 118 |
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| 119 |
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| 120 | # read in config file.
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| 121 | if (!open (CONF, $filename)) {
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| 122 | print $outhandle "DBPlugin: can't read $filename: $!\n";
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| 123 | return 0;
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| 124 | }
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| 125 |
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| 126 | my $line;
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| 127 | my $statement="";
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| 128 | my $callback="";
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| 129 | while (defined($line=<CONF>)) {
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| 130 | chomp $line;
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| 131 | $line .= " "; # for multi-line statements - don't conjoin!
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| 132 | $line =~ s/\s*\#.*$//mg; # remove comments
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| 133 | $statement .= $line;
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| 134 |
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| 135 | if ($line =~ /^\}\s*$/ && $callback) { # ends the callback
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| 136 | $callback .= $statement ; $statement = "";
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| 137 | # try to check that the function is "safe"
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| 138 | if ($callback =~ /\b(?:system|open|pipe|readpipe|qx|kill|eval|do|use|require|exec|fork)\b/ ||
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| 139 | $callback =~ /[\`]|\|\-/) {
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| 140 | # no backticks or functions that start new processes allowed
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| 141 | print $outhandle "DBPlugin: bad function in callback\n";
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| 142 | return 0;
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| 143 | }
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| 144 | $callback =~ s/sub (\w+?)_callback/sub/;
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| 145 | my $fieldname = $1;
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| 146 | my $ret = eval "\$callbacks{'$fieldname'} = $callback ; 1";
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| 147 | if (!defined($ret)) {
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| 148 | print $outhandle "DBPlugin: error eval'ing callback: $@\n";
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| 149 | exit(1);
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| 150 | }
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| 151 | $callback="";
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| 152 | print $outhandle "DBPlugin: callback registered for '$fieldname'\n"
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| 153 | if $dbplug_debug;
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| 154 | } elsif ($callback) {
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| 155 | # add this line to the callback function
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| 156 | $callback .= $statement;
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| 157 | $statement = "";
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| 158 | } elsif ($statement =~ m/;\s*$/) { # ends with ";"
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| 159 | # check that it is safe
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| 160 | # assignment
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| 161 | if ($statement =~ m~(\$\w+)\s* = \s*
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| 162 | (\d # digits
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| 163 | | ".*?(?<!\\)" # " up to the next " not preceded by a \
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| 164 | | '.*?(?<!\\)' # ' up to the next ' not preceded by a \
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| 165 | )\s*;~x || # /x means ignore comments and whitespace in rx
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| 166 | $statement =~ m~(\%\w+)\s*=\s*(\([\w\s\"\',:=>]+\))\s*;~ ) {
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| 167 | # evaluate the assignment, return 1 on success "
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| 168 | if (!eval "$1=$2; 1") {
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| 169 | my $err=$@;
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| 170 | chomp $err;
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| 171 | $err =~ s/\.$//; # remove a trailing .
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| 172 | print $outhandle "DBPlugin: error evaluating `$statement'\n";
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| 173 | print $outhandle " $err (in $filename)\n";
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| 174 | return 0; # there was an error reading the config file
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| 175 | }
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| 176 | } elsif ($statement =~ /sub \w+_callback/) {
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| 177 | # this is the start of a callback function definition
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| 178 | $callback = $statement;
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| 179 | $statement = "";
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| 180 | } else {
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| 181 | print $outhandle "DBPlugin: skipping statement `$statement'\n";
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| 182 | }
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| 183 | $statement = "";
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| 184 | }
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| 185 | }
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| 186 | close CONF;
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| 187 |
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| 188 |
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| 189 | if (!defined($db)) {
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| 190 | print $outhandle "DBPlugin: error: $filename does not specify a db!\n";
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| 191 | return 0;
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| 192 | }
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| 193 | if (!defined($sql_query)) {
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| 194 | print $outhandle "DBPlugin: error: no SQL query specified!\n";
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| 195 | return 0;
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| 196 | }
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| 197 | # connect to database
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| 198 | my $dbhandle=DBI->connect($db, $username, $password);
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| 199 |
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| 200 | if (!defined($dbhandle)) {
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| 201 | die "DBPlugin: could not connect to database, exiting.\n";
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| 202 | }
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| 203 | if (defined($dbplug_debug) && $dbplug_debug==1) {
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| 204 | print $outhandle "DBPlugin (debug): connected ok\n";
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| 205 | }
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| 206 |
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| 207 | my $statement_hand;
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| 208 |
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| 209 | # The user gave 2 sql statements to execute?
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| 210 | if ($sql_query_prime) {
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| 211 | $statement_hand=$dbhandle->prepare($sql_query_prime);
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| 212 | $statement_hand->execute;
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| 213 | if ($statement_hand->err) {
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| 214 | print $outhandle "Error: " . $statement_hand->errstr . "\n";
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| 215 | return undef;
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| 216 | }
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| 217 | }
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| 218 |
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| 219 |
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| 220 | $statement_hand=$dbhandle->prepare($sql_query);
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| 221 | $statement_hand->execute;
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| 222 | if ($statement_hand->err) {
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| 223 | print $outhandle "Error:" . $statement_hand->errstr . "\n";
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| 224 | return undef;
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| 225 | }
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| 226 |
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| 227 | # get the array-ref for the field names and cast it to array
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| 228 | my @field_names;
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| 229 | @field_names=@{ $statement_hand->{NAME} };
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| 230 |
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| 231 | foreach my $fieldname (@field_names) {
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| 232 | if (defined($db_to_greenstone_fields{$fieldname})) {
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| 233 | if (defined($dbplug_debug) && $dbplug_debug==1) {
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| 234 | print $outhandle "DBPlugin (debug): mapping db field "
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| 235 | . "'$fieldname' to "
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| 236 | . $db_to_greenstone_fields{$fieldname} . "\n";
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| 237 | }
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| 238 | $fieldname=$db_to_greenstone_fields{$fieldname};
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| 239 | }
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| 240 | }
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| 241 |
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| 242 | # get rows
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| 243 |
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| 244 | my $count = 0;
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| 245 | my @row_array;
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| 246 |
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| 247 | @row_array=$statement_hand->fetchrow_array; # fetchrow_hashref?
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| 248 |
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| 249 | while (scalar(@row_array)) {
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| 250 | if (defined($dbplug_debug) && $dbplug_debug==1) {
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| 251 | print $outhandle "DBPlugin (debug): retrieved a row from query\n";
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| 252 | }
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| 253 |
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| 254 | # create a new document
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| 255 | my $doc_obj = new doc ($filename, "indexed_doc");
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| 256 | $doc_obj->set_OIDtype ($processor->{'OIDtype'}, $processor->{'OIDmetadata'});
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| 257 | my $cursection = $doc_obj->get_top_section();
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| 258 |
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| 259 | # if $language not set in config file, will use BasePlugin's default
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| 260 | if (defined($language)) {
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| 261 | $doc_obj->add_utf8_metadata($cursection, "Language", $language);
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| 262 | }
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| 263 | # if $encoding not set in config file, will use BasePlugin's default
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| 264 | if (defined($encoding)) {
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| 265 | # allow some common aliases
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| 266 | if ($encoding =~ m/^utf[-_]8$/i) {$encoding="utf8"}
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| 267 | $encoding =~ s/-/_/g; # greenstone uses eg iso_8859_1
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| 268 | $doc_obj->add_utf8_metadata($cursection, "Encoding", $encoding);
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| 269 | }
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| 270 | $self->set_Source_metadata($doc_obj, $db, $encoding);
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| 271 |
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| 272 | if ($self->{'cover_image'}) {
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| 273 | $self->associate_cover_image($doc_obj, $filename);
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| 274 | }
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| 275 | $doc_obj->add_utf8_metadata($doc_obj->get_top_section(), "Plugin", "$self->{'plugin_type'}");
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| 276 |
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| 277 | $doc_obj->add_metadata($doc_obj->get_top_section(), "FileFormat", "DB");
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| 278 |
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| 279 | # include any metadata passed in from previous plugins
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| 280 | # note that this metadata is associated with the top level section
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| 281 | $self->extra_metadata ($doc_obj, $cursection,
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| 282 | $metadata);
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| 283 |
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| 284 | # do any automatic metadata extraction
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| 285 | $self->auto_extract_metadata ($doc_obj);
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| 286 |
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| 287 | my $unique_id=undef;
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| 288 |
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| 289 | foreach my $fieldname (@field_names) {
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| 290 | my $fielddata=shift @row_array;
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| 291 |
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| 292 | if (! defined($fielddata) ) {
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| 293 | next; # this field was "" or NULL
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| 294 | }
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| 295 | # use the specified encoding, defaulting to utf-8
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| 296 | if (defined($encoding) && $encoding ne "ascii"
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| 297 | && $encoding ne "utf8") {
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| 298 | $fielddata=&unicode::unicode2utf8(
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| 299 | &unicode::convert2unicode($encoding, \$fielddata)
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| 300 | );
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| 301 | }
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| 302 | # see if we have a ****_callback() function defined
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| 303 | if (exists $callbacks{$fieldname}) {
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| 304 | my $funcptr = $callbacks{$fieldname};
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| 305 | $fielddata = &$funcptr($fielddata);
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| 306 | }
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| 307 |
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| 308 | if ($fieldname eq "text") {
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| 309 | # add as document text
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| 310 | $fielddata=~s@<@<@g;
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| 311 | $fielddata=~s@>@>@g; # for xml protection...
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| 312 | $fielddata=~s@_@\\_@g; # for macro language protection...
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| 313 | $doc_obj->add_utf8_text($cursection, $fielddata);
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| 314 | } elsif ($fieldname eq "Identifier") {
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| 315 | # use as greenstone's unique record id
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| 316 | if ($fielddata =~ /^\d+$/) {
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| 317 | # don't allow IDs that are completely numeric
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| 318 | $unique_id="id" . $fielddata;
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| 319 | } else {
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| 320 | $unique_id=$fielddata;
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| 321 | }
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| 322 | } else {
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| 323 | # add as document metadata
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| 324 | $fielddata=~s/\[/[/g;
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| 325 | $fielddata=~s/\]/]/g;
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| 326 | $doc_obj->add_utf8_metadata($cursection,
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| 327 | $fieldname, $fielddata);
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| 328 |
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| 329 | }
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| 330 | }
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| 331 |
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| 332 |
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| 333 | if (!defined $unique_id) {
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| 334 | $doc_obj->set_OID();
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| 335 | my $id = $doc_obj->get_OID();
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| 336 | $doc_obj->set_OID($id."s$count");
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| 337 | } else {
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| 338 | # use our id from the database...
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| 339 | $doc_obj->set_OID($unique_id);
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| 340 | }
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| 341 |
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| 342 |
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| 343 | # process the document
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| 344 | $processor->process($doc_obj);
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| 345 |
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| 346 | $count++;
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| 347 |
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| 348 | # get next row
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| 349 | @row_array=$statement_hand->fetchrow_array; # fetchrow_hashref?
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| 350 | } # end of row_array is not empty
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| 351 |
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| 352 | # check "$sth->err" if empty array for error
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| 353 | if ($statement_hand->err) {
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| 354 | print $outhandle "DBPlugin: received error: \"" .
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| 355 | $statement_hand->errstr . "\"\n";
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| 356 | }
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| 357 |
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| 358 | # clean up connection to database
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| 359 | $statement_hand->finish();
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| 360 | $dbhandle->disconnect();
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| 361 |
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| 362 | # num of input files, rather than documents created?
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| 363 | $self->{'num_processed'}++;
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| 364 |
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| 365 | if (defined($dbplug_debug) && $dbplug_debug==1) {
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| 366 | print $outhandle "DBPlugin: imported $count DB records as documents.\n";
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| 367 | }
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| 368 | $count;
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| 369 | }
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| 370 |
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| 371 | 1;
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