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SearchMarc.pm
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SearchMarc.pm
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package C4::SearchMarc;
# Copyright 2000-2002 Katipo Communications
#
# This file is part of Koha.
#
# Koha is free software; you can redistribute it and/or modify it under the
# terms of the GNU General Public License as published by the Free Software
# Foundation; either version 2 of the License, or (at your option) any later
# version.
#
# Koha is distributed in the hope that it will be useful, but WITHOUT ANY
# WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
# A PARTICULAR PURPOSE. See the GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License along with
# Koha; if not, write to the Free Software Foundation, Inc., 59 Temple Place,
# Suite 330, Boston, MA 02111-1307 USA
use strict;
require Exporter;
use DBI;
use C4::Context;
use vars qw($VERSION @ISA @EXPORT @EXPORT_OK %EXPORT_TAGS);
# set the version for version checking
$VERSION = 0.02;
=head1 NAME
C4::Search - Functions for searching the Koha MARC catalog
=head1 SYNOPSIS
use C4::Search;
my ($count, @results) = catalogsearch();
=head1 DESCRIPTION
This module provides the searching facilities for the Koha MARC catalog
C<&catalogsearch> is a front end to all the other searches. Depending
on what is passed to it, it calls the appropriate search function.
=head1 FUNCTIONS
=over 2
=cut
@ISA = qw(Exporter);
@EXPORT = qw(&catalogsearch);
# make all your functions, whether exported or not;
# marcsearch : search in the MARC biblio table.
# everything is choosen by the user : what to search, the conditions...
sub catalogsearch {
my ($dbh, $tags, $subfields, $and_or, $excluding, $operator, $value, $offset,$length) = @_;
# build the sql request. She will look like :
# select m1.bibid
# from marc_subfield_table as m1, marc_subfield_table as m2
# where m1.bibid=m2.bibid and
# (m1.subfieldvalue like "Des%" and m2.subfieldvalue like "27%")
# "Normal" statements
my @normal_tags = ();
my @normal_subfields = ();
my @normal_and_or = ();
my @normal_operator = ();
my @normal_value = ();
# Extracts the NOT statements from the list of statements
my @not_tags = ();
my @not_subfields = ();
my @not_and_or = ();
my @not_operator = ();
my @not_value = ();
my $any_not = 0;
for(my $i = 0 ; $i <= $#{$value} ; $i++)
{
if(@$excluding[$i]) # NOT statements
{
$any_not = 1;
if(@$operator[$i] eq "contains")
{
foreach my $word (split(/ /, @$value[$i])) # if operator is contains, splits the words in separate requests
{
push @not_tags, @$tags[$i];
push @not_subfields, @$subfields[$i];
push @not_and_or, "or"; # as request is negated, finds "foo" or "bar" if final request is NOT "foo" and "bar"
push @not_operator, @$operator[$i];
push @not_value, $word;
}
}
else
{
push @not_tags, @$tags[$i];
push @not_subfields, @$subfields[$i];
push @not_and_or, "or"; # as request is negated, finds "foo" or "bar" if final request is NOT "foo" and "bar"
push @not_operator, @$operator[$i];
push @not_value, @$value[$i];
}
}
else # NORMAL statements
{
if(@$operator[$i] eq "contains") # if operator is contains, splits the words in separate requests
{
foreach my $word (split(/ /, @$value[$i]))
{
push @normal_tags, @$tags[$i];
push @normal_subfields, @$subfields[$i];
push @normal_and_or, "and"; # assumes "foo" and "bar" if "foo bar" is entered
push @normal_operator, @$operator[$i];
push @normal_value, $word;
}
}
else
{
push @normal_tags, @$tags[$i];
push @normal_subfields, @$subfields[$i];
push @normal_and_or, @$and_or[$i];
push @normal_operator, @$operator[$i];
push @normal_value, @$value[$i];
}
}
}
# Finds the basic results without the NOT requests
my ($sql_tables, $sql_where1, $sql_where2) = create_request(\@normal_tags, \@normal_subfields, \@normal_and_or, \@normal_operator, \@normal_value);
my $sth;
# warn "HERE (NORMAL)";
if ($sql_where2) {
$sth = $dbh->prepare("select distinct m1.bibid from $sql_tables where $sql_where2 and ($sql_where1)");
# warn("-->select m1.bibid from $sql_tables where $sql_where2 and ($sql_where1)");
} else {
$sth = $dbh->prepare("select distinct m1.bibid from $sql_tables where $sql_where1");
# warn("==>select m1.bibid from $sql_tables where $sql_where1");
}
$sth->execute();
my @result = ();
# Processes the NOT if any and there are results
my ($not_sql_tables, $not_sql_where1, $not_sql_where2);
if( ($sth->rows) && $any_not ) # some results to tune up and some NOT statements
{
($not_sql_tables, $not_sql_where1, $not_sql_where2) = create_request(\@not_tags, \@not_subfields, \@not_and_or, \@not_operator, \@not_value);
my @tmpresult;
while (my ($bibid) = $sth->fetchrow) {
push @tmpresult,$bibid;
}
my $sth_not;
# warn "HERE (NOT)";
if ($not_sql_where2) {
$sth_not = $dbh->prepare("select distinct m1.bibid from $not_sql_tables where $not_sql_where2 and ($not_sql_where1)");
# warn("-->select m1.bibid from $not_sql_tables where $not_sql_where2 and ($not_sql_where1)");
} else {
$sth_not = $dbh->prepare("select distinct m1.bibid from $not_sql_tables where $not_sql_where1");
# warn("==>select m1.bibid from $not_sql_tables where $not_sql_where1");
}
$sth_not->execute();
if($sth_not->rows)
{
my %not_bibids = ();
while(my $bibid = $sth_not->fetchrow()) {
$not_bibids{$bibid} = 1; # populates the hashtable with the bibids matching the NOT statement
}
foreach my $bibid (@tmpresult)
{
if(!$not_bibids{$bibid})
{
push @result, $bibid;
}
}
}
$sth_not->finish();
}
else # no NOT statements
{
while (my ($bibid) = $sth->fetchrow) {
push @result,$bibid;
}
}
# we have bibid list. Now, loads title and author from [offset] to [offset]+[length]
my $counter = $offset;
$sth = $dbh->prepare("select author,title from biblio,marc_biblio where biblio.biblionumber=marc_biblio.biblionumber and bibid=?");
my @finalresult = ();
while (($counter <= $#result) && ($counter <= ($offset + $length))) {
$sth->execute($result[$counter]);
my ($author,$title) = $sth->fetchrow;
my %line;
$line{bibid}=$result[$counter];
$line{author}=$author;
$line{title}=$title;
push @finalresult, \%line;
$counter++;
}
my $nbresults = $#result + 1;
return (\@finalresult, $nbresults);
}
# Creates the SQL Request
sub create_request {
my ($tags, $subfields, $and_or, $operator, $value) = @_;
my $sql_tables; # will contain marc_subfield_table as m1,...
my $sql_where1; # will contain the "true" where
my $sql_where2 = "("; # will contain m1.bibid=m2.bibid
my $nb_active=0; # will contain the number of "active" entries. and entry is active is a value is provided.
my $nb_table=1; # will contain the number of table. ++ on each entry EXCEPT when an OR is provided.
for(my $i=0; $i<=@$value;$i++) {
if (@$value[$i]) {
$nb_active++;
if ($nb_active==1) {
if (@$operator[$i] eq "start") {
$sql_tables .= "marc_subfield_table as m$nb_table,";
$sql_where1 .= "(m1.subfieldvalue like '@$value[$i]%'";
if (@$tags[$i]) {
$sql_where1 .=" and m1.tag=@$tags[$i] and m1.subfieldcode='@$subfields[$i]'";
}
$sql_where1.=")";
} elsif (@$operator[$i] eq "contains") {
$sql_tables .= "marc_word as m$nb_table,";
$sql_where1 .= "(m1.word like '@$value[$i]%'";
if (@$tags[$i]) {
$sql_where1 .=" and m1.tag=@$tags[$i] and m1.subfieldid='@$subfields[$i]'";
}
$sql_where1.=")";
} else {
$sql_tables .= "marc_subfield_table as m$nb_table,";
$sql_where1 .= "(m1.subfieldvalue @$operator[$i] '@$value[$i]' ";
if (@$tags[$i]) {
$sql_where1 .=" and m1.tag=@$tags[$i] and m1.subfieldcode='@$subfields[$i]'";
}
$sql_where1.=")";
}
} else {
if (@$operator[$i] eq "start") {
$nb_table++;
$sql_tables .= "marc_subfield_table as m$nb_table,";
$sql_where1 .= "@$and_or[$i] (m$nb_table.subfieldvalue like '@$value[$i]%'";
if (@$tags[$i]) {
$sql_where1 .=" and m$nb_table.tag=@$tags[$i] and m$nb_table.subfieldcode='@$subfields[$i]'";
}
$sql_where1.=")";
$sql_where2 .= "m1.bibid=m$nb_table.bibid and ";
} elsif (@$operator[$i] eq "contains") {
if (@$and_or[$i] eq 'and') {
$nb_table++;
$sql_tables .= "marc_word as m$nb_table,";
$sql_where1 .= "@$and_or[$i] (m$nb_table.word like '@$value[$i]%'";
if (@$tags[$i]) {
$sql_where1 .=" and m$nb_table.tag=@$tags[$i] and m$nb_table.subfieldid='@$subfields[$i]'";
}
$sql_where1.=")";
$sql_where2 .= "m1.bibid=m$nb_table.bibid and ";
} else {
$sql_where1 .= "@$and_or[$i] (m$nb_table.word like '@$value[$i]%'";
if (@$tags[$i]) {
$sql_where1 .=" and m$nb_table.tag=@$tags[$i] and m$nb_table.subfieldid='@$subfields[$i]'";
}
$sql_where1.=")";
$sql_where2 .= "m1.bibid=m$nb_table.bibid and ";
}
} else {
$nb_table++;
$sql_tables .= "marc_subfield_table as m$nb_table,";
$sql_where1 .= "@$and_or[$i] (m$nb_table.subfieldvalue @$operator[$i] '@$value[$i]'";
if (@$tags[$i]) {
$sql_where1 .=" and m$nb_table.tag=@$tags[$i] and m$nb_table.subfieldcode='@$subfields[$i]'";
}
$sql_where2 .= "m1.bibid=m$nb_table.bibid and ";
$sql_where1.=")";
}
}
}
}
if($sql_where2 ne "(") # some datas added to sql_where2, processing
{
$sql_where2 = substr($sql_where2, 0, (length($sql_where2)-5)); # deletes the trailing ' and '
$sql_where2 .= ")";
}
else # no sql_where2 statement, deleting '('
{
$sql_where2 = "";
}
chop $sql_tables; # deletes the trailing ','
return ($sql_tables, $sql_where1, $sql_where2);
}
END { } # module clean-up code here (global destructor)
1;
__END__
=back
=head1 AUTHOR
Koha Developement team <info@koha.org>
=cut