C4/VirtualShelves.pm

   1 # -*- tab-width: 8 -*-
   2 # Please use 8-character tabs for this file (indents are every 4 characters)
   3
   4 package C4::VirtualShelves;
   5
   6
   7 # Copyright 2000-2002 Katipo Communications
   8 #
   9 # This file is part of Koha.
  10 #
  11 # Koha is free software; you can redistribute it and/or modify it under the
  12 # terms of the GNU General Public License as published by the Free Software
  13 # Foundation; either version 2 of the License, or (at your option) any later
  14 # version.
  15 #
  16 # Koha is distributed in the hope that it will be useful, but WITHOUT ANY
  17 # WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
  18 # A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
  19 #
  20 # You should have received a copy of the GNU General Public License along with
  21 # Koha; if not, write to the Free Software Foundation, Inc., 59 Temple Place,
  22 # Suite 330, Boston, MA  02111-1307 USA
  23
  24 use strict;
  25 use warnings;
  26
  27 use Carp;
  28 use C4::Context;
  29 use C4::Circulation;
  30 use C4::Debug;
  31 use C4::Members;
  32 require C4::Auth;
  33
  34 use vars qw($VERSION @ISA @EXPORT @EXPORT_OK);
  35
  36 BEGIN {
  37         # set the version for version checking
  38         $VERSION = 3.02;
  39         require Exporter;
  40         @ISA    = qw(Exporter);
  41         @EXPORT = qw(
  42             &GetShelves &GetShelfContents &GetShelf
  43             &AddToShelf &AddToShelfFromBiblio &AddShelf
  44             &ModShelf
  45             &ShelfPossibleAction
  46             &DelFromShelf &DelShelf
  47             &GetBibliosShelves
  48         );
  49         @EXPORT_OK = qw(
  50             &GetShelvesSummary &GetRecentShelves
  51             &RefreshShelvesSummary &SetShelvesLimit
  52         );
  53 }
  54
  55
  56 my $dbh = C4::Context->dbh;
  57
  58 =head1 NAME
  59
  60 C4::VirtualShelves - Functions for manipulating Koha virtual virtualshelves
  61
  62 =head1 SYNOPSIS
  63
  64   use C4::VirtualShelves;
  65
  66 =head1 DESCRIPTION
  67
  68 This module provides functions for manipulating virtual virtualshelves,
  69 including creating and deleting virtualshelves, and adding and removing
  70 items to and from virtualshelves.
  71
  72 =head1 FUNCTIONS
  73
  74 =over 2
  75
  76 =item GetShelves
  77
  78   ($shelflist, $totshelves) = &GetShelves($mincategory, $row_count, $offset, $owner);
  79   ($shelfnumber, $shelfhash) = each %{$shelflist};
  80
  81 Returns the number of shelves specified by C<$row_count> and C<$offset> as well as the total
  82 number of shelves that meet the C<$owner> and C<$mincategory> criteria.  C<$mincategory>,
  83 C<$row_count>, and C<$offset> are required. C<$owner> must be supplied when C<$mincategory> == 1.
  84 When C<$mincategory> is 2 or 3, supply undef as argument for C<$owner>.
  85 C<$shelflist>is a reference-to-hash. The keys are the virtualshelves numbers (C<$shelfnumber>, above),
  86 and the values (C<$shelfhash>, above) are themselves references-to-hash, with the following keys:
  87
  88 =over 4
  89
  90 =item C<$shelfhash-E<gt>{shelfname}>
  91
  92 A string. The name of the shelf.
  93
  94 =item C<$shelfhash-E<gt>{count}>
  95
  96 The number of virtuals on that virtualshelves.
  97
  98 =back
  99
 100 =cut
 101
 102 sub GetShelves ($$$$) {
 103     my ($mincategory, $row_count, $offset, $owner) = @_;
 104         my @params = ($owner, $mincategory, ($offset ? $offset : 0), $row_count);
 105         my @params1 = ($owner, $mincategory);
 106         if ($mincategory > 1) {
 107                 shift @params;
 108                 shift @params1;
 109         }
 110         my $total = _shelf_count($owner, $mincategory);
 111     # grab only the shelves meeting the row_count/offset spec...
 112     my $query = qq(
 113         SELECT virtualshelves.shelfnumber, virtualshelves.shelfname,owner,surname,firstname,virtualshelves.category,virtualshelves.sortfield,
 114                count(virtualshelfcontents.biblionumber) as count
 115         FROM   virtualshelves
 116             LEFT JOIN   virtualshelfcontents ON virtualshelves.shelfnumber = virtualshelfcontents.shelfnumber
 117             LEFT JOIN   borrowers ON virtualshelves.owner = borrowers.borrowernumber );
 118     $query .= ($mincategory == 1) ? "WHERE  owner=? AND category=?" : "WHERE category>=?";
 119         $query .= qq(
 120         GROUP BY virtualshelves.shelfnumber
 121         ORDER BY virtualshelves.category
 122                 DESC
 123                 LIMIT ?, ?);
 124     my $sth2 = $dbh->prepare($query);
 125     $sth2->execute(@params);
 126     my %shelflist;
 127     while ( my ( $shelfnumber, $shelfname, $owner, $surname,
 128                 $firstname,   $category,  $sortfield, $count ) = $sth2->fetchrow ) {
 129         $shelflist{$shelfnumber}->{'shelfname'} = $shelfname;
 130         $shelflist{$shelfnumber}->{'count'}     = $count;
 131         $shelflist{$shelfnumber}->{'sortfield'} = $sortfield;
 132         $shelflist{$shelfnumber}->{'category'}  = $category;
 133         $shelflist{$shelfnumber}->{'owner'}     = $owner;
 134         $shelflist{$shelfnumber}->{'surname'}   = $surname;
 135         $shelflist{$shelfnumber}->{'firstname'} = $firstname;
 136     }
 137     return ( \%shelflist, $total );
 138 }
 139
 140 =item GetShelvesSummary
 141
 142         ($shelves, $total) = GetShelvesSummary($mincategory, $row_count, $offset, $owner)
 143
 144 Returns the number of shelves specified by C<$row_count> and C<$offset> as well as the total
 145 number of shelves that meet the C<$owner> and/or C<$mincategory> criteria. C<$mincategory>,
 146 C<$row_count>, and C<$offset> are required. C<$owner> must be supplied when C<$mincategory> == 1.
 147 When C<$mincategory> is 2 or 3, supply undef as argument for C<$owner>.
 148
 149 =cut
 150
 151 sub GetShelvesSummary ($$$$) {
 152     my ($mincategory, $row_count, $offset, $owner) = @_;
 153         my @params = ($owner, $mincategory, ($offset ? $offset : 0), $row_count);
 154         my @params1 = ($owner, $mincategory);
 155         if ($mincategory > 1) {
 156                 shift @params;
 157                 shift @params1;
 158         }
 159         my $total = _shelf_count($owner, $mincategory);
 160     # grab only the shelves meeting the row_count/offset spec...
 161         my $query = qq(
 162                 SELECT
 163                         virtualshelves.shelfnumber,
 164                         virtualshelves.shelfname,
 165                         owner,
 166                         CONCAT(firstname, ' ', surname) AS name,
 167                         virtualshelves.category,
 168                         count(virtualshelfcontents.biblionumber) AS count
 169                 FROM   virtualshelves
 170                         LEFT JOIN  virtualshelfcontents ON virtualshelves.shelfnumber = virtualshelfcontents.shelfnumber
 171                         LEFT JOIN             borrowers ON virtualshelves.owner = borrowers.borrowernumber );
 172     $query .= ($mincategory == 1) ? "WHERE  owner=? AND category=?" : "WHERE category>=?";
 173         $query .= qq(
 174                 GROUP BY virtualshelves.shelfnumber
 175                 ORDER BY virtualshelves.category
 176                 DESC
 177                 LIMIT ?, ?);
 178         my $sth2 = $dbh->prepare($query);
 179         $sth2->execute(@params);
 180     my $shelves = $sth2->fetchall_arrayref({});
 181     return ($shelves, $total);
 182
 183         # Probably NOT the final implementation since it is still bulky (repeated hash keys).
 184         # might like an array of rows of delimited values:
 185         # 1|2||0|blacklist|112
 186         # 2|6|Josh Ferraro|51|en_fuego|106
 187 }
 188
 189 =item GetRecentShelves
 190
 191         ($shelflist) = GetRecentShelves(1, $limit, $owner)
 192
 193 This function returns a references to an array of hashrefs containing specified shelves sorted
 194 by the date the shelf was last modified in descending order limited to the number of records
 195 specified by C<$row_count>. If calling with C<$mincategory> other than 1, use undef as C<$owner>.
 196
 197 This function is intended to return a dataset reflecting the most recently active shelves for
 198 the submitted parameters.
 199
 200 =cut
 201
 202 sub GetRecentShelves ($$$) {
 203         my ($mincategory, $row_count, $owner) = @_;
 204     my (@shelflist);
 205         my $total = _shelf_count($owner, $mincategory);
 206         my @params = ($owner, $mincategory, 0, $row_count);      #FIXME: offset is hardcoded here, but could be passed in for enhancements
 207         shift @params if (not defined $owner);
 208         my $query = "SELECT * FROM virtualshelves";
 209         $query .= ((defined $owner) ? " WHERE owner = ? AND category = ?" : " WHERE category >= ? ");
 210         $query .= " ORDER BY lastmodified DESC LIMIT ?, ?";
 211         my $sth = $dbh->prepare($query);
 212         $sth->execute(@params);
 213         @shelflist = $sth->fetchall_arrayref({});
 214         return ( \@shelflist, $total );
 215 }
 216
 217 =item GetShelf
 218
 219   (shelfnumber,shelfname,owner,category,sortfield) = &GetShelf($shelfnumber);
 220
 221 Looks up information about the contents of virtual virtualshelves number
 222 C<$shelfnumber>
 223
 224 Returns the database's information on 'virtualshelves' table.
 225
 226 =cut
 227
 228 sub GetShelf ($) {
 229     my ($shelfnumber) = @_;
 230     my $query = qq(
 231         SELECT shelfnumber, shelfname, owner, category, sortfield
 232         FROM   virtualshelves
 233         WHERE  shelfnumber=?
 234     );
 235     my $sth = $dbh->prepare($query);
 236     $sth->execute($shelfnumber);
 237     return $sth->fetchrow;
 238 }
 239
 240 =item GetShelfContents
 241
 242   $itemlist = &GetShelfContents($shelfnumber);
 243
 244 Looks up information about the contents of virtual virtualshelves number
 245 C<$shelfnumber>.  Sorted by a field in the biblio table.  copyrightdate
 246 gives a desc sort.
 247
 248 Returns a reference-to-array, whose elements are references-to-hash,
 249 as returned by C<C4::Biblio::GetBiblioFromItemNumber>.
 250
 251 Note: the notforloan status comes from the itemtype, and where it equals 0
 252 it does not ensure that related items.notforloan status is likewise 0. The
 253 caller has to check any items on their own, possibly with CanBookBeIssued
 254 from C4::Circulation.
 255
 256 =cut
 257
 258 sub GetShelfContents ($;$$$) {
 259     my ($shelfnumber, $row_count, $offset, $sortfield) = @_;
 260     my $dbh=C4::Context->dbh();
 261         my $sth1 = $dbh->prepare("SELECT count(*) FROM virtualshelfcontents WHERE shelfnumber = ?");
 262         $sth1->execute($shelfnumber);
 263         my $total = $sth1->fetchrow;
 264         if(!$sortfield) {
 265                 my $sth2 = $dbh->prepare('SELECT sortfield FROM virtualshelves WHERE shelfnumber=?');
 266                 $sth2->execute($shelfnumber);
 267                 ($sortfield) = $sth2->fetchrow_array;
 268         }
 269     my $query =
 270        " SELECT vc.biblionumber, vc.shelfnumber, vc.dateadded, itemtypes.*,
 271                                 biblio.*, biblioitems.itemtype, biblioitems.publicationyear
 272          FROM   virtualshelfcontents vc
 273                  LEFT JOIN biblio      ON      vc.biblionumber =      biblio.biblionumber
 274                  LEFT JOIN biblioitems ON  biblio.biblionumber = biblioitems.biblionumber
 275                  LEFT JOIN itemtypes   ON biblioitems.itemtype = itemtypes.itemtype
 276          WHERE  vc.shelfnumber=? ";
 277         my @params = ($shelfnumber);
 278         if($sortfield) {
 279                 $query .= " ORDER BY ? ";
 280                 $query .= " DESC " if ($sortfield eq 'copyrightdate');
 281                 push (@params, $sortfield);
 282         }
 283     if($row_count){
 284            $query .= " LIMIT ?, ? ";
 285            push (@params, ($offset ? $offset : 0));
 286            push (@params, $row_count);
 287     }
 288     my $sth3 = $dbh->prepare($query);
 289         $sth3->execute(@params);
 290         return ($sth3->fetchall_arrayref({}), $total);
 291         # Like the perldoc says,
 292         # returns reference-to-array, where each element is reference-to-hash of the row:
 293         #   like [ $sth->fetchrow_hashref(), $sth->fetchrow_hashref() ... ]
 294         # Suitable for use in TMPL_LOOP.
 295         # See http://search.cpan.org/~timb/DBI-1.601/DBI.pm#fetchall_arrayref
 296         # or newer, for your version of DBI.
 297 }
 298
 299 =item AddShelf
 300
 301   $shelfnumber = &AddShelf( $shelfname, $owner, $category);
 302
 303 Creates a new virtual virtualshelves with name C<$shelfname>, owner C<$owner> and category
 304 C<$category>.
 305
 306 Returns a code to know what's happen.
 307     * -1 : if this virtualshelves already exist.
 308     * $shelfnumber : if success.
 309
 310 =cut
 311
 312 sub AddShelf {
 313     my ( $shelfname, $owner, $category, $sortfield ) = @_;
 314     my $query = qq(
 315         SELECT *
 316         FROM   virtualshelves
 317         WHERE  shelfname=? AND owner=?
 318     );
 319     my $sth = $dbh->prepare($query);
 320     $sth->execute($shelfname,$owner);
 321     ( $sth->rows ) and return (-1);
 322     $query = qq(
 323         INSERT INTO virtualshelves
 324             (shelfname,owner,category,sortfield)
 325         VALUES (?,?,?,?)
 326     );
 327     $sth = $dbh->prepare($query);
 328     $sth->execute( $shelfname, $owner, $category, $sortfield );
 329     my $shelfnumber = $dbh->{'mysql_insertid'};
 330     return ($shelfnumber);
 331 }
 332
 333 =item AddToShelf
 334
 335   &AddToShelf($biblionumber, $shelfnumber);
 336
 337 Adds item number C<$biblionumber> to virtual virtualshelves number
 338 C<$shelfnumber>, unless that item is already on that shelf.
 339
 340 =cut
 341
 342 #'
 343 sub AddToShelf {
 344     my ( $biblionumber, $shelfnumber ) = @_;
 345     return unless $biblionumber;
 346     my $query = qq(
 347         SELECT *
 348         FROM   virtualshelfcontents
 349         WHERE  shelfnumber=? AND biblionumber=?
 350     );
 351     my $sth = $dbh->prepare($query);
 352
 353     $sth->execute( $shelfnumber, $biblionumber );
 354     ($sth->rows) and return undef;      # already on shelf
 355         $query = qq(
 356                 INSERT INTO virtualshelfcontents
 357                         (shelfnumber, biblionumber, flags)
 358                 VALUES
 359                         (?, ?, 0)
 360         );
 361         $sth = $dbh->prepare($query);
 362         $sth->execute( $shelfnumber, $biblionumber );
 363         $query = qq(UPDATE virtualshelves
 364                                 SET lastmodified = CURRENT_TIMESTAMP
 365                                 WHERE shelfnumber = ?);
 366         $sth = $dbh->prepare($query);
 367         $sth->execute( $shelfnumber );
 368 }
 369
 370 =item AddToShelfFromBiblio
 371
 372     &AddToShelfFromBiblio($biblionumber, $shelfnumber)
 373
 374     this function allow to add a virtual into the shelf number $shelfnumber
 375     from biblionumber.
 376
 377 =cut
 378
 379 sub AddToShelfFromBiblio {
 380     my ( $biblionumber, $shelfnumber ) = @_;
 381     return unless $biblionumber;
 382     my $query = qq(
 383         SELECT *
 384         FROM   virtualshelfcontents
 385         WHERE  shelfnumber=? AND biblionumber=?
 386     );
 387     my $sth = $dbh->prepare($query);
 388     $sth->execute( $shelfnumber, $biblionumber );
 389     unless ( $sth->rows ) {
 390         my $query =qq(
 391             INSERT INTO virtualshelfcontents
 392                 (shelfnumber, biblionumber, flags)
 393             VALUES
 394                 (?, ?, 0)
 395         );
 396         $sth = $dbh->prepare($query);
 397         $sth->execute( $shelfnumber, $biblionumber );
 398                 $query = qq(UPDATE virtualshelves
 399                                         SET lastmodified = CURRENT_TIMESTAMP
 400                                         WHERE shelfnumber = ?);
 401                 $sth = $dbh->prepare($query);
 402                 $sth->execute( $shelfnumber );
 403     }
 404 }
 405
 406 =item ModShelf
 407
 408 ModShelf($shelfnumber, $hashref)
 409
 410 Where $hashref->{column} = param
 411
 412 Modify the value into virtualshelves table with values given
 413 from hashref, which each key of the hashref should be
 414 the name of a column of virtualshelves.
 415
 416 =cut
 417
 418 sub ModShelf {
 419     my $shelfnumber = shift;
 420     my $shelf = shift;
 421
 422     if (exists $shelf->{shelfnumber}) {
 423         carp "Should not use ModShelf to change shelfnumber";
 424         return;
 425     }
 426     unless (defined $shelfnumber and $shelfnumber =~ /^\d+$/) {
 427         carp "Invalid shelfnumber passed to ModShelf: $shelfnumber";
 428         return;
 429     }
 430
 431         my $query = "UPDATE virtualshelves SET ";
 432     my @bind_params = ();
 433     my @set_clauses = ();
 434
 435         foreach my $column (keys %$shelf) {
 436         push @set_clauses, "$column = ?";
 437         push @bind_params, $shelf->{$column};
 438     }
 439
 440     if ($#set_clauses == -1) {
 441         carp "No columns to update passed to ModShelf";
 442         return;
 443     }
 444     $query .= join(", ", @set_clauses);
 445
 446     $query .= " WHERE shelfnumber = ? ";
 447     push @bind_params, $shelfnumber;
 448
 449     $debug and warn "ModShelf query:\n $query\n",
 450                         "ModShelf query args: ", join(',', @bind_params), "\n";
 451         my $sth = $dbh->prepare($query);
 452         $sth->execute( @bind_params );
 453 }
 454
 455 =item ShelfPossibleAction
 456
 457 ShelfPossibleAction($loggedinuser, $shelfnumber, $action);
 458
 459 C<$loggedinuser,$shelfnumber,$action>
 460
 461 $action can be "view" or "manage".
 462
 463 Returns 1 if the user can do the $action in the $shelfnumber shelf.
 464 Returns 0 otherwise.
 465
 466 =cut
 467
 468 sub ShelfPossibleAction {
 469     my ( $user, $shelfnumber, $action ) = @_;
 470     my $query = qq(
 471         SELECT owner,category
 472         FROM   virtualshelves
 473         WHERE  shelfnumber=?
 474     );
 475     my $sth = $dbh->prepare($query);
 476     $sth->execute($shelfnumber);
 477     my ( $owner, $category ) = $sth->fetchrow;
 478         my $borrower = GetMemberDetails($user);
 479         return 1 if ( $category >= 3);                                                  # open list
 480     return 1 if (($category >= 2) and
 481                                 defined($action) and $action eq 'view');        # public list, anybody can view
 482     return 1 if (($category >= 2) and defined($user) and ($borrower->{authflags}->{superlibrarian} || $user == 0));     # public list, superlibrarian can edit/delete
 483     return 1 if (defined($user)  and $owner  eq $user );        # user owns this list.  Check last.
 484     return 0;
 485 }
 486
 487 =item DelFromShelf
 488
 489   &DelFromShelf( $biblionumber, $shelfnumber);
 490
 491 Removes item number C<$biblionumber> from virtual virtualshelves number
 492 C<$shelfnumber>. If the item wasn't on that virtualshelves to begin with,
 493 nothing happens.
 494
 495 =cut
 496
 497 #'
 498 sub DelFromShelf {
 499     my ( $biblionumber, $shelfnumber ) = @_;
 500     my $query = qq(
 501         DELETE FROM virtualshelfcontents
 502         WHERE  shelfnumber=? AND biblionumber=?
 503     );
 504     my $sth = $dbh->prepare($query);
 505     $sth->execute( $shelfnumber, $biblionumber );
 506 }
 507
 508 =item DelShelf (old version)
 509
 510   ($status, $msg) = &DelShelf($shelfnumber);
 511
 512 Deletes virtual virtualshelves number C<$shelfnumber>. The virtualshelves must
 513 be empty.
 514
 515 Returns a two-element array, where C<$status> is 0 if the operation
 516 was successful, or non-zero otherwise. C<$msg> is "Done" in case of
 517 success, or an error message giving the reason for failure.
 518
 519 =item DelShelf (current version)
 520
 521   $Number = DelShelf($shelfnumber);
 522
 523 This function deletes the shelf number, and all of it's content.
 524
 525 =cut
 526
 527 sub DelShelf {
 528         unless (@_) {
 529                 carp "DelShelf called without valid argument (shelfnumber)";
 530                 return undef;
 531         }
 532         my $sth = $dbh->prepare("DELETE FROM virtualshelves WHERE shelfnumber=?");
 533         return $sth->execute(shift);
 534 }
 535
 536 =item GetBibShelves
 537
 538 This finds all the public lists that this bib record is in.
 539
 540 =cut
 541
 542 sub GetBibliosShelves {
 543     my ( $biblionumber )  = @_;
 544     my $dbh = C4::Context->dbh;
 545     my $sth = $dbh->prepare('
 546         SELECT vs.shelfname, vs.shelfnumber
 547         FROM virtualshelves vs
 548         JOIN virtualshelfcontents vc ON (vs.shelfnumber= vc.shelfnumber)
 549         WHERE vs.category != 1
 550         AND vc.biblionumber= ?
 551     ');
 552     $sth->execute( $biblionumber );
 553     return $sth->fetchall_arrayref({});
 554 }
 555
 556 =item RefreshShelvesSummary
 557
 558         ($total, $pubshelves, $barshelves) = RefreshShelvesSummary($sessionID, $loggedinuser, $row_count);
 559
 560 Updates the current session and userenv with the most recent shelves
 561
 562 Returns the total number of shelves stored in the session/userenv along with two references each to an
 563 array of hashes, one containing the C<$loggedinuser>'s private shelves and one containing all public/open shelves.
 564
 565 This function is used in conjunction with the 'Lists' button in masthead.inc.
 566
 567 =cut
 568
 569 sub RefreshShelvesSummary ($$$) {
 570
 571         my ($sessionID, $loggedinuser, $row_count) = @_;
 572         my $session = C4::Auth::get_session($sessionID);
 573         my ($total, $totshelves, $barshelves, $pubshelves);
 574
 575         ($barshelves, $totshelves) = GetRecentShelves(1, $row_count, $loggedinuser);
 576         $total->{'bartotal'} = $totshelves;
 577         ($pubshelves, $totshelves) = GetRecentShelves(2, $row_count, undef);
 578         $total->{'pubtotal'} = $totshelves;
 579
 580         # Update the current session with the latest shelves...
 581         $session->param('barshelves', $barshelves->[0]);
 582         $session->param('pubshelves', $pubshelves->[0]);
 583         $session->param('totshelves', $total);
 584
 585         # likewise the userenv...
 586         C4::Context->set_shelves_userenv('bar',$barshelves->[0]);
 587         C4::Context->set_shelves_userenv('pub',$pubshelves->[0]);
 588         C4::Context::set_shelves_userenv('tot',$total);
 589
 590         return ($total, $pubshelves, $barshelves);
 591 }
 592
 593 # internal subs
 594
 595 sub _shelf_count ($$) {
 596         my (@params) = @_;
 597         # Find out how many shelves total meet the submitted criteria...
 598         my $query = "SELECT count(*) FROM virtualshelves";
 599         $query .= ($params[1] > 1) ? " WHERE category >= ?" : " WHERE  owner=? AND category=?";
 600         shift @params if $params[1] > 1;
 601         my $sth = $dbh->prepare($query);
 602         $sth->execute(@params);
 603         my $total = $sth->fetchrow;
 604         return $total;
 605 }
 606
 607 sub _biblionumber_sth {
 608     my ($shelf) = @_;
 609     my $query = 'select biblionumber from virtualshelfcontents where shelfnumber = ?';
 610     my $dbh = C4::Context->dbh;
 611     my $sth = $dbh->prepare($query)
 612         or die $dbh->errstr;
 613     $sth->execute( $shelf )
 614         or die $sth->errstr;
 615     $sth;
 616 }
 617
 618 sub each_biblionumbers (&$) {
 619     my ($code,$shelf) = @_;
 620     my $ref =  _biblionumber_sth($shelf)->fetchall_arrayref;
 621     map {
 622         $_=$$_[0];
 623         $code->();
 624     } @$ref;
 625 }
 626
 627 1;
 628
 629 __END__
 630
 631 =back
 632
 633 =head1 AUTHOR
 634
 635 Koha Developement team <info@koha.org>
 636
 637 =head1 SEE ALSO
 638
 639 C4::Circulation::Circ2(3)
 640
 641 =cut