f981c4c15f
* search on non marc fields : the marc field is found by a sub in Biblio.pm * ordering a search This commit shows the sql in log. Pls test it's correctly indexed (using : explain <sql_in_log>)
325 lines
11 KiB
Perl
325 lines
11 KiB
Perl
package C4::SearchMarc;
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# Copyright 2000-2002 Katipo Communications
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#
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# This file is part of Koha.
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#
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# Koha is free software; you can redistribute it and/or modify it under the
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# terms of the GNU General Public License as published by the Free Software
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# Foundation; either version 2 of the License, or (at your option) any later
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# version.
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#
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# Koha is distributed in the hope that it will be useful, but WITHOUT ANY
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# WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
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# A PARTICULAR PURPOSE. See the GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License along with
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# Koha; if not, write to the Free Software Foundation, Inc., 59 Temple Place,
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# Suite 330, Boston, MA 02111-1307 USA
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use strict;
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require Exporter;
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use DBI;
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use C4::Context;
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use C4::Biblio;
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use vars qw($VERSION @ISA @EXPORT @EXPORT_OK %EXPORT_TAGS);
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# set the version for version checking
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$VERSION = 0.02;
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=head1 NAME
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C4::Search - Functions for searching the Koha MARC catalog
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=head1 SYNOPSIS
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use C4::Search;
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my ($count, @results) = catalogsearch();
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=head1 DESCRIPTION
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This module provides the searching facilities for the Koha MARC catalog
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C<&catalogsearch> is a front end to all the other searches. Depending
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on what is passed to it, it calls the appropriate search function.
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=head1 FUNCTIONS
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=over 2
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=cut
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@ISA = qw(Exporter);
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@EXPORT = qw(&catalogsearch &findseealso);
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# make all your functions, whether exported or not;
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sub findseealso {
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my ($dbh, $fields) = @_;
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my $tagslib = MARCgettagslib ($dbh,1);
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for (my $i=0;$i<=$#{$fields};$i++) {
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my ($tag) =substr(@$fields[$i],1,3);
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my ($subfield) =substr(@$fields[$i],4,1);
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@$fields[$i].=','.$tagslib->{$tag}->{$subfield}->{seealso} if ($tagslib->{$tag}->{$subfield}->{seealso});
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}
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}
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# marcsearch : search in the MARC biblio table.
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# everything is choosen by the user : what to search, the conditions...
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sub catalogsearch {
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my ($dbh, $tags, $and_or, $excluding, $operator, $value, $offset,$length,$orderby) = @_;
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# build the sql request. She will look like :
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# select m1.bibid
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# from marc_subfield_table as m1, marc_subfield_table as m2
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# where m1.bibid=m2.bibid and
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# (m1.subfieldvalue like "Des%" and m2.subfieldvalue like "27%")
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# "Normal" statements
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my @normal_tags = ();
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my @normal_and_or = ();
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my @normal_operator = ();
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my @normal_value = ();
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# Extracts the NOT statements from the list of statements
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my @not_tags = ();
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my @not_and_or = ();
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my @not_operator = ();
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my @not_value = ();
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my $any_not = 0;
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$orderby = "biblio.title" unless $orderby;
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for(my $i = 0 ; $i <= $#{$value} ; $i++)
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{
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if(@$excluding[$i]) # NOT statements
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{
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$any_not = 1;
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if(@$operator[$i] eq "contains")
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{
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foreach my $word (split(/ /, @$value[$i])) # if operator is contains, splits the words in separate requests
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{
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unless (C4::Context->stopwords->{uc($word)}) { #it's NOT a stopword => use it. Otherwise, ignore
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push @not_tags, @$tags[$i];
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push @not_and_or, "or"; # as request is negated, finds "foo" or "bar" if final request is NOT "foo" and "bar"
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push @not_operator, @$operator[$i];
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push @not_value, $word;
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}
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}
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}
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else
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{
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push @not_tags, @$tags[$i];
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push @not_and_or, "or"; # as request is negated, finds "foo" or "bar" if final request is NOT "foo" and "bar"
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push @not_operator, @$operator[$i];
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push @not_value, @$value[$i];
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}
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}
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else # NORMAL statements
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{
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if(@$operator[$i] eq "contains") # if operator is contains, splits the words in separate requests
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{
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foreach my $word (split(/ /, @$value[$i]))
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{
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unless (C4::Context->stopwords->{uc($word)}) { #it's NOT a stopword => use it. Otherwise, ignore
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my $tag = substr(@$tags[$i],0,3);
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my $subf = substr(@$tags[$i],3,1);
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push @normal_tags, @$tags[$i];
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push @normal_and_or, "and"; # assumes "foo" and "bar" if "foo bar" is entered
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push @normal_operator, @$operator[$i];
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push @normal_value, $word;
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}
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}
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}
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else
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{
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push @normal_tags, @$tags[$i];
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push @normal_and_or, @$and_or[$i];
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push @normal_operator, @$operator[$i];
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push @normal_value, @$value[$i];
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}
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}
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}
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# Finds the basic results without the NOT requests
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my ($sql_tables, $sql_where1, $sql_where2) = create_request(\@normal_tags, \@normal_and_or, \@normal_operator, \@normal_value);
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my $sth;
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if ($sql_where2) {
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$sth = $dbh->prepare("select distinct m1.bibid from biblio,biblioitems,marc_biblio,$sql_tables where biblio.biblionumber=marc_biblio.biblionumber and biblio.biblionumber=biblioitems.biblionumber and m1.bibid=marc_biblio.bibid and $sql_where2 and ($sql_where1) order by $orderby");
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warn "Q2 : select distinct m1.bibid from biblio,biblioitems,marc_biblio,$sql_tables where biblio.biblionumber=marc_biblio.biblionumber and biblio.biblionumber=biblioitems.biblionumber and m1.bibid=marc_biblio.bibid and $sql_where2 and ($sql_where1) order by $orderby";
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} else {
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$sth = $dbh->prepare("select distinct m1.bibid from biblio,biblioitems,marc_biblio,$sql_tables where biblio.biblionumber=marc_biblio.biblionumber and biblio.biblionumber=biblioitems.biblionumber and m1.bibid=marc_biblio.bibid and $sql_where1 order by $orderby");
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warn "Q : select distinct m1.bibid from biblio,biblioitems,marc_biblio,$sql_tables where biblio.biblionumber=marc_biblio.biblionumber and biblio.biblionumber=biblioitems.biblionumber and m1.bibid=marc_biblio.bibid and $sql_where1 order by $orderby";
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}
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$sth->execute();
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my @result = ();
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# Processes the NOT if any and there are results
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my ($not_sql_tables, $not_sql_where1, $not_sql_where2);
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if( ($sth->rows) && $any_not ) # some results to tune up and some NOT statements
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{
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($not_sql_tables, $not_sql_where1, $not_sql_where2) = create_request(\@not_tags, \@not_and_or, \@not_operator, \@not_value);
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my @tmpresult;
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while (my ($bibid) = $sth->fetchrow) {
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push @tmpresult,$bibid;
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}
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my $sth_not;
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warn "NOT : select distinct m1.bibid from $not_sql_tables where $not_sql_where2 and ($not_sql_where1)";
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if ($not_sql_where2) {
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$sth_not = $dbh->prepare("select distinct m1.bibid from $not_sql_tables where $not_sql_where2 and ($not_sql_where1)");
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} else {
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$sth_not = $dbh->prepare("select distinct m1.bibid from $not_sql_tables where $not_sql_where1");
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}
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$sth_not->execute();
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if($sth_not->rows)
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{
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my %not_bibids = ();
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while(my $bibid = $sth_not->fetchrow()) {
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$not_bibids{$bibid} = 1; # populates the hashtable with the bibids matching the NOT statement
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}
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foreach my $bibid (@tmpresult)
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{
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if(!$not_bibids{$bibid})
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{
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push @result, $bibid;
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}
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}
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}
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$sth_not->finish();
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}
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else # no NOT statements
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{
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while (my ($bibid) = $sth->fetchrow) {
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push @result,$bibid;
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}
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}
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# we have bibid list. Now, loads title and author from [offset] to [offset]+[length]
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my $counter = $offset;
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$sth = $dbh->prepare("select author,title from biblio,marc_biblio where biblio.biblionumber=marc_biblio.biblionumber and bibid=?");
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my @finalresult = ();
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while (($counter <= $#result) && ($counter <= ($offset + $length))) {
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$sth->execute($result[$counter]);
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my ($author,$title) = $sth->fetchrow;
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my %line;
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$line{bibid}=$result[$counter];
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$line{author}=$author;
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$line{title}=$title;
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push @finalresult, \%line;
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$counter++;
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}
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my $nbresults = $#result + 1;
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return (\@finalresult, $nbresults);
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}
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# Creates the SQL Request
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sub create_request {
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my ($tags, $and_or, $operator, $value) = @_;
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my $sql_tables; # will contain marc_subfield_table as m1,...
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my $sql_where1; # will contain the "true" where
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my $sql_where2 = "("; # will contain m1.bibid=m2.bibid
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my $nb_active=0; # will contain the number of "active" entries. and entry is active is a value is provided.
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my $nb_table=1; # will contain the number of table. ++ on each entry EXCEPT when an OR is provided.
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for(my $i=0; $i<=@$value;$i++) {
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if (@$value[$i]) {
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$nb_active++;
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if ($nb_active==1) {
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if (@$operator[$i] eq "start") {
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$sql_tables .= "marc_subfield_table as m$nb_table,";
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$sql_where1 .= "(m1.subfieldvalue like '@$value[$i]%'";
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if (@$tags[$i]) {
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$sql_where1 .=" and m1.tag+m1.subfieldcode in (@$tags[$i])";
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}
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$sql_where1.=")";
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} elsif (@$operator[$i] eq "contains") {
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$sql_tables .= "marc_word as m$nb_table,";
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$sql_where1 .= "(m1.word like '@$value[$i]%'";
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if (@$tags[$i]) {
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$sql_where1 .=" and m1.tag+m1.subfieldid in (@$tags[$i])";
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}
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$sql_where1.=")";
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} else {
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$sql_tables .= "marc_subfield_table as m$nb_table,";
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$sql_where1 .= "(m1.subfieldvalue @$operator[$i] '@$value[$i]' ";
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if (@$tags[$i]) {
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$sql_where1 .=" and m1.tag+m1.subfieldcode in (@$tags[$i])";
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}
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$sql_where1.=")";
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}
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} else {
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if (@$operator[$i] eq "start") {
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$nb_table++;
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$sql_tables .= "marc_subfield_table as m$nb_table,";
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$sql_where1 .= "@$and_or[$i] (m$nb_table.subfieldvalue like '@$value[$i]%'";
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if (@$tags[$i]) {
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$sql_where1 .=" and m$nb_table.tag+m$nb_table.subfieldcode in (@$tags[$i])";
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}
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$sql_where1.=")";
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$sql_where2 .= "m1.bibid=m$nb_table.bibid and ";
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} elsif (@$operator[$i] eq "contains") {
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if (@$and_or[$i] eq 'and') {
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$nb_table++;
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$sql_tables .= "marc_word as m$nb_table,";
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$sql_where1 .= "@$and_or[$i] (m$nb_table.word like '@$value[$i]%'";
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if (@$tags[$i]) {
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$sql_where1 .=" and m$nb_table.tag+m$nb_table.subfieldid in(@$tags[$i])";
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}
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$sql_where1.=")";
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$sql_where2 .= "m1.bibid=m$nb_table.bibid and ";
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} else {
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$sql_where1 .= "@$and_or[$i] (m$nb_table.word like '@$value[$i]%'";
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if (@$tags[$i]) {
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$sql_where1 .=" and m$nb_table.tag+m$nb_table.subfieldid in (@$tags[$i])";
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}
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$sql_where1.=")";
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$sql_where2 .= "m1.bibid=m$nb_table.bibid and ";
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}
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} else {
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$nb_table++;
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$sql_tables .= "marc_subfield_table as m$nb_table,";
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$sql_where1 .= "@$and_or[$i] (m$nb_table.subfieldvalue @$operator[$i] '@$value[$i]'";
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if (@$tags[$i]) {
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$sql_where1 .=" and m$nb_table.tag+m$nb_table.subfieldcode in (@$tags[$i])";
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}
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$sql_where2 .= "m1.bibid=m$nb_table.bibid and ";
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$sql_where1.=")";
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}
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}
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}
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}
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if($sql_where2 ne "(") # some datas added to sql_where2, processing
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{
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$sql_where2 = substr($sql_where2, 0, (length($sql_where2)-5)); # deletes the trailing ' and '
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$sql_where2 .= ")";
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}
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else # no sql_where2 statement, deleting '('
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{
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$sql_where2 = "";
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}
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chop $sql_tables; # deletes the trailing ','
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return ($sql_tables, $sql_where1, $sql_where2);
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}
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END { } # module clean-up code here (global destructor)
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1;
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__END__
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=back
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=head1 AUTHOR
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Koha Developement team <info@koha.org>
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=cut
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