new feature : image for itemtypes.

[koha_fer] / updater / updatedatabase

#!/usr/bin/perl

# $Id$

# Database Updater
# This script checks for required updates to the database.

# Part of the Koha Library Software www.koha.org
# Licensed under the GPL.

# Bugs/ToDo:
# - Would also be a good idea to offer to do a backup at this time...

# NOTE:  If you do something more than once in here, make it table driven.
use strict;

# CPAN modules
use DBI;
use Getopt::Long;
# Koha modules
use C4::Context;

use MARC::Record;
use MARC::File::XML;

# FIXME - The user might be installing a new database, so can't rely
# on /etc/koha.conf anyway.

my $debug = 0;

my (
    $sth, $sti,
    $query,
    %existingtables,    # tables already in database
    %types,
    $table,
    $column,
    $type, $null, $key, $default, $extra,
    $prefitem,          # preference item in systempreferences table
);

my $silent;
GetOptions(
        's' =>\$silent
        );
my $dbh = C4::Context->dbh;
print "connected to your DB. Checking & modifying it\n" unless $silent;
$|=1; # flushes output

#-------------------
# Defines

# Tables to add if they don't exist
my %requiretables = (
    categorytable       => "(categorycode char(5) NOT NULL default '',
                             description text default '',
                             itemtypecodes text default '',
                             PRIMARY KEY (categorycode)
                            )",
    subcategorytable       => "(subcategorycode char(5) NOT NULL default '',
                             description text default '',
                             itemtypecodes text default '',
                             PRIMARY KEY (subcategorycode)
                            )",
    mediatypetable       => "(mediatypecode char(5) NOT NULL default '',
                             description text default '',
                             itemtypecodes text default '',
                             PRIMARY KEY (mediatypecode)
                            )",
    action_logs         => "(
                                    `timestamp` TIMESTAMP NOT NULL ,
                                    `user` INT( 11 ) NOT NULL ,
                                    `module` TEXT default '',
                                    `action` TEXT default '' ,
                                    `object` INT(11) default '' ,
                                    `info` TEXT default '' ,
                                    PRIMARY KEY ( `timestamp` , `user` )
                            )",
        letter          => "(
                                        module varchar(20) NOT NULL default '',
                                        code varchar(20) NOT NULL default '',
                                        name varchar(100) NOT NULL default '',
                                        title varchar(200) NOT NULL default '',
                                        content text,
                                        PRIMARY KEY  (module,code)
                                )",
        alert           =>"(
                                        alertid int(11) NOT NULL auto_increment,
                                        borrowernumber int(11) NOT NULL default '0',
                                        type varchar(10) NOT NULL default '',
                                        externalid varchar(20) NOT NULL default '',
                                        PRIMARY KEY  (alertid),
                                        KEY borrowernumber (borrowernumber),
                                        KEY type (type,externalid)
                                )",

);

my %requirefields = (
        subscription => { 'letter' => 'char(20) NULL'},
        itemtypes => { 'imageurl' => 'char(200) NULL'},
#    tablename        => { 'field' => 'fieldtype' },
);

my %dropable_table = (
# tablename => 'tablename',
);

my %uselessfields = (
# tablename => "field1,field2",
        );
# the other hash contains other actions that can't be done elsewhere. they are done
# either BEFORE of AFTER everything else, depending on "when" entry (default => AFTER)

# The tabledata hash contains data that should be in the tables.
# The uniquefieldrequired hash entry is used to determine which (if any) fields
# must not exist in the table for this row to be inserted.  If the
# uniquefieldrequired entry is already in the table, the existing data is not
# modified, unless the forceupdate hash entry is also set.  Fields in the
# anonymous "forceupdate" hash will be forced to be updated to the default
# values given in the %tabledata hash.

my %tabledata = (
# tablename => [
#       {       uniquefielrequired => 'fieldname', # the primary key in the table
#               fieldname => fieldvalue,
#               fieldname2 => fieldvalue2,
#       },
# ],
    systempreferences => [
                {
            uniquefieldrequired => 'variable',
            variable            => 'Activate_Log',
            value               => 'On',
            forceupdate         => { 'explanation' => 1,
                                     'type' => 1},
            explanation         => 'Turn Log Actions on DB On an Off',
            type                => 'YesNo',
        },
        {
            uniquefieldrequired => 'variable',
            variable            => 'IndependantBranches',
            value               => 0,
            forceupdate         => { 'explanation' => 1,
                                     'type' => 1},
            explanation         => 'Turn Branch independancy management On an Off',
            type                => 'YesNo',
        },
                {
            uniquefieldrequired => 'variable',
            variable            => 'ReturnBeforeExpiry',
            value               => 'Off',
            forceupdate         => { 'explanation' => 1,
                                     'type' => 1},
            explanation         => 'If Yes, Returndate on issuing can\'t be after borrower card expiry',
            type                => 'YesNo',
        },
    ],

);

my %fielddefinitions = (
# fieldname => [
#       {                 field => 'fieldname',
#             type    => 'fieldtype',
#             null    => '',
#             key     => '',
#             default => ''
#         },
#     ],
        serial => [
        {
            field   => 'notes',
            type    => 'TEXT',
            null    => 'NULL',
            key     => '',
            default => '',
            extra   => ''
        },
    ],
);

#-------------------
# Initialize

# Start checking

# Get version of MySQL database engine.
my $mysqlversion = `mysqld --version`;
$mysqlversion =~ /Ver (\S*) /;
$mysqlversion = $1;
if ( $mysqlversion ge '3.23' ) {
    print "Could convert to MyISAM database tables...\n" unless $silent;
}

#---------------------------------
# Tables

# Collect all tables into a list
$sth = $dbh->prepare("show tables");
$sth->execute;
while ( my ($table) = $sth->fetchrow ) {
    $existingtables{$table} = 1;
}


# Now add any missing tables
foreach $table ( keys %requiretables ) {
    unless ( $existingtables{$table} ) {
        print "Adding $table table...\n" unless $silent;
        my $sth = $dbh->prepare("create table $table $requiretables{$table}");
        $sth->execute;
        if ( $sth->err ) {
            print "Error : $sth->errstr \n";
            $sth->finish;
        }    # if error
    }    # unless exists
}    # foreach

# now drop useless tables
foreach $table ( keys %dropable_table ) {
        if ( $existingtables{$table} ) {
                print "Dropping unused table $table\n" if $debug and not $silent;
                $dbh->do("drop table $table");
                if ( $dbh->err ) {
                        print "Error : $dbh->errstr \n";
                }
        }
}

#---------------------------------
# Columns

foreach $table ( keys %requirefields ) {
    print "Check table $table\n" if $debug and not $silent;
    $sth = $dbh->prepare("show columns from $table");
    $sth->execute();
    undef %types;
    while ( ( $column, $type, $null, $key, $default, $extra ) = $sth->fetchrow )
    {
        $types{$column} = $type;
    }    # while
    foreach $column ( keys %{ $requirefields{$table} } ) {
        print "  Check column $column  [$types{$column}]\n" if $debug and not $silent;
        if ( !$types{$column} ) {

            # column doesn't exist
            print "Adding $column field to $table table...\n" unless $silent;
            $query = "alter table $table
                        add column $column " . $requirefields{$table}->{$column};
            print "Execute: $query\n" if $debug;
            my $sti = $dbh->prepare($query);
            $sti->execute;
            if ( $sti->err ) {
                print "**Error : $sti->errstr \n";
                $sti->finish;
            }    # if error
        }    # if column
    }    # foreach column
}    # foreach table

foreach $table ( keys %fielddefinitions ) {
        print "Check table $table\n" if $debug;
        $sth = $dbh->prepare("show columns from $table");
        $sth->execute();
        my $definitions;
        while ( ( $column, $type, $null, $key, $default, $extra ) = $sth->fetchrow )
        {
                $definitions->{$column}->{type}    = $type;
                $definitions->{$column}->{null}    = $null;
                $definitions->{$column}->{key}     = $key;
                $definitions->{$column}->{default} = $default;
                $definitions->{$column}->{extra}   = $extra;
        }    # while
        my $fieldrow = $fielddefinitions{$table};
        foreach my $row (@$fieldrow) {
                my $field   = $row->{field};
                my $type    = $row->{type};
                my $null    = $row->{null};
#               $null    = 'YES' if $row->{null} eq 'NULL';
                my $key     = $row->{key};
                my $default = $row->{default};
                $default="''" unless $default;
                my $extra   = $row->{extra};
                my $def     = $definitions->{$field};
                unless ( $type eq $def->{type}
                        && $null eq $def->{null}
                        && $key eq $def->{key}
                        && $default eq $def->{default}
                        && $extra eq $def->{extra} )
                {

                        if ( $null eq '' ) {
                                $null = 'NOT NULL';
                        }
                        if ( $key eq 'PRI' ) {
                                $key = 'PRIMARY KEY';
                        }
                        unless ( $extra eq 'auto_increment' ) {
                                $extra = '';
                        }
                        # if it's a new column use "add", if it's an old one, use "change".
                        my $action;
                        if ($definitions->{$field}->{type}) {
                                $action="change $field"
                        } else {
                                $action="add";
                        }
# if it's a primary key, drop the previous pk, before altering the table
                        my $sth;
                        if ($key ne 'PRIMARY KEY') {
                                $sth =$dbh->prepare("alter table $table $action $field $type $null $key $extra default ?");
                        } else {
                                $sth =$dbh->prepare("alter table $table drop primary key, $action $field $type $null $key $extra default ?");
                        }
                        $sth->execute($default);
                        print "  Alter $field in $table\n" unless $silent;
                }
        }
}


# Populate tables with required data
foreach my $table ( keys %tabledata ) {
    print "Checking for data required in table $table...\n" unless $silent;
    my $tablerows = $tabledata{$table};
    foreach my $row (@$tablerows) {
        my $uniquefieldrequired = $row->{uniquefieldrequired};
        my $uniquevalue         = $row->{$uniquefieldrequired};
        my $forceupdate         = $row->{forceupdate};
        my $sth                 =
          $dbh->prepare(
"select $uniquefieldrequired from $table where $uniquefieldrequired=?"
        );
        $sth->execute($uniquevalue);
        if ($sth->rows) {
            foreach my $field (keys %$forceupdate) {
                if ($forceupdate->{$field}) {
                    my $sth=$dbh->prepare("update systempreferences set $field=? where $uniquefieldrequired=?");
                    $sth->execute($row->{$field}, $uniquevalue);
                }
            }
        } else {
            print "Adding row to $table: " unless $silent;
            my @values;
            my $fieldlist;
            my $placeholders;
            foreach my $field ( keys %$row ) {
                next if $field eq 'uniquefieldrequired';
                next if $field eq 'forceupdate';
                my $value = $row->{$field};
                push @values, $value;
                print "  $field => $value" unless $silent;
                $fieldlist .= "$field,";
                $placeholders .= "?,";
            }
            print "\n" unless $silent;
            $fieldlist    =~ s/,$//;
            $placeholders =~ s/,$//;
            my $sth =
              $dbh->prepare(
                "insert into $table ($fieldlist) values ($placeholders)");
            $sth->execute(@values);
        }
    }
}

#
# SPECIFIC STUFF
#
#
# create frameworkcode row in biblio table & fill it with marc_biblio.frameworkcode.
#

# 1st, get how many biblio we will have to do...
$sth = $dbh->prepare('select count(*) from marc_biblio');
$sth->execute;
my ($totaltodo) = $sth->fetchrow;

$sth = $dbh->prepare("show columns from biblio");
$sth->execute();
my $definitions;
my $bibliofwexist=0;
while ( ( $column, $type, $null, $key, $default, $extra ) = $sth->fetchrow ){
        $bibliofwexist=1 if $column eq 'frameworkcode';
}
unless ($bibliofwexist) {
        print "moving biblioframework to biblio table\n";
        $dbh->do('ALTER TABLE `biblio` ADD `frameworkcode` VARCHAR( 4 ) NOT NULL AFTER `biblionumber`');
        $sth = $dbh->prepare('select biblionumber,frameworkcode from marc_biblio');
        $sth->execute;
        my $sth_update = $dbh->prepare('update biblio set frameworkcode=? where biblionumber=?');
        my $totaldone=0;
        while (my ($biblionumber,$frameworkcode) = $sth->fetchrow) {
                $sth_update->execute($frameworkcode,$biblionumber);
                $totaldone++;
                print "\r$totaldone / $totaltodo" unless ($totaldone % 100);
        }
        print "\rdone\n";
}

#
# moving MARC data from marc_subfield_table to biblioitems.marc
#
$sth = $dbh->prepare("show columns from biblioitems");
$sth->execute();
my $definitions;
my $marcdone=0;
while ( ( $column, $type, $null, $key, $default, $extra ) = $sth->fetchrow ){
        $marcdone=1 if ($type eq 'blob' && $column eq 'marc') ;
}
unless ($marcdone) {
        print "moving MARC record to biblioitems table\n";
        # changing marc field type
        $dbh->do('ALTER TABLE `biblioitems` CHANGE `marc` `marc` BLOB NULL DEFAULT NULL ');
        # adding marc xml, just for convenience
        $dbh->do('ALTER TABLE `biblioitems` ADD `marcxml` TEXT NOT NULL');
        # moving data from marc_subfield_value to biblio
        $sth = $dbh->prepare('select bibid,biblionumber from marc_biblio');
        $sth->execute;
        my $sth_update = $dbh->prepare('update biblioitems set marc=?, marcxml=? where biblionumber=?');
        my $totaldone=0;
        while (my ($bibid,$biblionumber) = $sth->fetchrow) {
                my $record = MARCgetbiblio($dbh,$bibid);
                $sth_update->execute($record->as_usmarc(),$record->as_xml(),$biblionumber);
                $totaldone++;
                print "\r$totaldone / $totaltodo" unless ($totaldone % 100);
        }
        print "\rdone\n";
}

# at last, remove useless fields
foreach $table ( keys %uselessfields ) {
        my @fields = split /,/,$uselessfields{$table};
        my $fields;
        my $exists;
        foreach my $fieldtodrop (@fields) {
                $fieldtodrop =~ s/\t//g;
                $fieldtodrop =~ s/\n//g;
                $exists =0;
                $sth = $dbh->prepare("show columns from $table");
                $sth->execute;
                while ( my ( $column, $type, $null, $key, $default, $extra ) = $sth->fetchrow )
                {
                        $exists =1 if ($column eq $fieldtodrop);
                }
                if ($exists) {
                        print "deleting $fieldtodrop field in $table...\n" unless $silent;
                        my $sth = $dbh->prepare("alter table $table drop $fieldtodrop");
                        $sth->execute;
                }
        }
}    # foreach


$sth->finish;

#
# those 2 subs are a copy of Biblio.pm, version 2.2.4
# they are useful only once, for moving from 2.2 to 3.0
# the MARCgetbiblio & MARCgetitem subs in Biblio.pm
# are still here, but uses other tables
# (the ones that are filled by updatedatabase !)
#
sub MARCgetbiblio {

    # Returns MARC::Record of the biblio passed in parameter.
    my ( $dbh, $bibid ) = @_;
    my $record = MARC::Record->new();
#       warn "". $bidid;

    my $sth =
      $dbh->prepare(
"select bibid,subfieldid,tag,tagorder,tag_indicator,subfieldcode,subfieldorder,subfieldvalue,valuebloblink
                                 from marc_subfield_table
                                 where bibid=? order by tag,tagorder,subfieldorder
                         "
    );
    my $sth2 =
      $dbh->prepare(
        "select subfieldvalue from marc_blob_subfield where blobidlink=?");
    $sth->execute($bibid);
    my $prevtagorder = 1;
    my $prevtag      = 'XXX';
    my $previndicator;
    my $field;        # for >=10 tags
    my $prevvalue;    # for <10 tags
    while ( my $row = $sth->fetchrow_hashref ) {

        if ( $row->{'valuebloblink'} ) {    #---- search blob if there is one
            $sth2->execute( $row->{'valuebloblink'} );
            my $row2 = $sth2->fetchrow_hashref;
            $sth2->finish;
            $row->{'subfieldvalue'} = $row2->{'subfieldvalue'};
        }
        if ( $row->{tagorder} ne $prevtagorder || $row->{tag} ne $prevtag ) {
            $previndicator .= "  ";
            if ( $prevtag < 10 ) {
                                if ($prevtag ne '000') {
                        $record->add_fields( ( sprintf "%03s", $prevtag ), $prevvalue ) unless $prevtag eq "XXX";    # ignore the 1st loop
                                } else {
                                        $record->leader(sprintf("%24s",$prevvalue));
                                }
            }
            else {
                $record->add_fields($field) unless $prevtag eq "XXX";
            }
            undef $field;
            $prevtagorder  = $row->{tagorder};
            $prevtag       = $row->{tag};
            $previndicator = $row->{tag_indicator};
            if ( $row->{tag} < 10 ) {
                $prevvalue = $row->{subfieldvalue};
            }
            else {
                $field = MARC::Field->new(
                    ( sprintf "%03s", $prevtag ),
                    substr( $row->{tag_indicator} . '  ', 0, 1 ),
                    substr( $row->{tag_indicator} . '  ', 1, 1 ),
                    $row->{'subfieldcode'},
                    $row->{'subfieldvalue'}
                );
            }
        }
        else {
            if ( $row->{tag} < 10 ) {
                $record->add_fields( ( sprintf "%03s", $row->{tag} ),
                    $row->{'subfieldvalue'} );
            }
            else {
                $field->add_subfields( $row->{'subfieldcode'},
                    $row->{'subfieldvalue'} );
            }
            $prevtag       = $row->{tag};
            $previndicator = $row->{tag_indicator};
        }
    }

    # the last has not been included inside the loop... do it now !
    if ( $prevtag ne "XXX" )
    { # check that we have found something. Otherwise, prevtag is still XXX and we
         # must return an empty record, not make MARC::Record fail because we try to
         # create a record with XXX as field :-(
        if ( $prevtag < 10 ) {
            $record->add_fields( $prevtag, $prevvalue );
        }
        else {

            #           my $field = MARC::Field->new( $prevtag, "", "", %subfieldlist);
            $record->add_fields($field);
        }
    }
    return $record;
}

sub MARCgetitem {

    # Returns MARC::Record of the biblio passed in parameter.
    my ( $dbh, $bibid, $itemnumber ) = @_;
    my $record = MARC::Record->new();

    # search MARC tagorder
    my $sth2 =
      $dbh->prepare(
"select tagorder from marc_subfield_table,marc_subfield_structure where marc_subfield_table.tag=marc_subfield_structure.tagfield and marc_subfield_table.subfieldcode=marc_subfield_structure.tagsubfield and bibid=? and kohafield='items.itemnumber' and subfieldvalue=?"
    );
    $sth2->execute( $bibid, $itemnumber );
    my ($tagorder) = $sth2->fetchrow_array();

    #---- TODO : the leader is missing
    my $sth =
      $dbh->prepare(
"select bibid,subfieldid,tag,tagorder,tag_indicator,subfieldcode,subfieldorder,subfieldvalue,valuebloblink
                                 from marc_subfield_table
                                 where bibid=? and tagorder=? order by subfieldcode,subfieldorder
                         "
    );
    $sth2 =
      $dbh->prepare(
        "select subfieldvalue from marc_blob_subfield where blobidlink=?");
    $sth->execute( $bibid, $tagorder );
    while ( my $row = $sth->fetchrow_hashref ) {
        if ( $row->{'valuebloblink'} ) {    #---- search blob if there is one
            $sth2->execute( $row->{'valuebloblink'} );
            my $row2 = $sth2->fetchrow_hashref;
            $sth2->finish;
            $row->{'subfieldvalue'} = $row2->{'subfieldvalue'};
        }
        if ( $record->field( $row->{'tag'} ) ) {
            my $field;

#--- this test must stay as this, because of strange behaviour of mySQL/Perl DBI with char var containing a number...
            #--- sometimes, eliminates 0 at beginning, sometimes no ;-\\\
            if ( length( $row->{'tag'} ) < 3 ) {
                $row->{'tag'} = "0" . $row->{'tag'};
            }
            $field = $record->field( $row->{'tag'} );
            if ($field) {
                my $x =
                  $field->add_subfields( $row->{'subfieldcode'},
                    $row->{'subfieldvalue'} );
                $record->delete_field($field);
                $record->add_fields($field);
            }
        }
        else {
            if ( length( $row->{'tag'} ) < 3 ) {
                $row->{'tag'} = "0" . $row->{'tag'};
            }
            my $temp =
              MARC::Field->new( $row->{'tag'}, " ", " ",
                $row->{'subfieldcode'} => $row->{'subfieldvalue'} );
            $record->add_fields($temp);
        }

    }
    return $record;
}


exit;

# $Log$
# Revision 1.122  2005/09/02 14:18:38  tipaul
# new feature : image for itemtypes.
#
# * run updater/updatedatabase to create imageurl field in itemtypes.
# * go to Koha >> parameters >> itemtypes >> modify (or add) an itemtype. You will see around 20 nice images to choose between (thanks to owen). If you prefer your own image, you also can type a complete url (http://www.myserver.lib/path/to/my/image.gif)
# * go to OPAC, and search something. In the result list, you now have the picture instead of the text itemtype.
#
# Revision 1.121  2005/08/24 08:49:03  hdl
# Adding a note field in serial table.
# This will allow librarian to mention a note on a peculiar waiting serial number.
#
# Revision 1.120  2005/08/09 14:10:32  tipaul
# 1st commit to go to zebra.
# don't update your cvs if you want to have a working head...
#
# this commit contains :
# * updater/updatedatabase : get rid with marc_* tables, but DON'T remove them. As a lot of things uses them, it would not be a good idea for instance to drop them. If you really want to play, you can rename them to test head without them but being still able to reintroduce them...
# * Biblio.pm : modify MARCgetbiblio to find the raw marc record in biblioitems.marc field, not from marc_subfield_table, modify MARCfindframeworkcode to find frameworkcode in biblio.frameworkcode, modify some other subs to use biblio.biblionumber & get rid of bibid.
# * other files : get rid of bibid and use biblionumber instead.
#
# What is broken :
# * does not do anything on zebra yet.
# * if you rename marc_subfield_table, you can't search anymore.
# * you can view a biblio & bibliodetails, go to MARC editor, but NOT save any modif.
# * don't try to add a biblio, it would add data poorly... (don't try to delete either, it may work, but that would be a surprise ;-) )
#
# IMPORTANT NOTE : you need MARC::XML package (http://search.cpan.org/~esummers/MARC-XML-0.7/lib/MARC/File/XML.pm), that requires a recent version of MARC::Record
# Updatedatabase stores the iso2709 data in biblioitems.marc field & an xml version in biblioitems.marcxml Not sure we will keep it when releasing the stable version, but I think it's a good idea to have something readable in sql, at least for development stage.
#
# Revision 1.119  2005/08/04 16:07:58  tipaul
# Synch really broke this script...
#
# Revision 1.118  2005/08/04 16:02:55  tipaul
# oops... error in synch between 2.2 and head
#
# Revision 1.117  2005/08/04 14:24:39  tipaul
# synch'ing 2.2 and head
#
# Revision 1.116  2005/08/04 08:55:54  tipaul
# Letters / alert system, continuing...
#
# * adding a package Letters.pm, that manages Letters & alerts.
# * adding feature : it's now possible to define a "letter" for any subscription created. If a letter is defined, users in OPAC can put an alert on the subscription. When an issue is marked "arrived", all users in the alert will recieve a mail (as defined in the "letter"). This last part (= send the mail) is not yet developped. (Should be done this week)
# * adding feature : it's now possible to "put to an alert" in OPAC, for any serial subscription. The alert is stored in a new table, called alert. An alert can be put only if the librarian has activated them in subscription (and they activate it just by choosing a "letter" to sent to borrowers on new issues)
# * adding feature : librarian can see in borrower detail which alerts they have put, and a user can see in opac-detail which alert they have put too.
#
# Note that the system should be generic enough to manage any type of alert.
# I plan to extend it soon to virtual shelves : a borrower will be able to put an alert on a virtual shelf, to be warned when something is changed in the virtual shelf (mail being sent once a day by cron, or manually by the shelf owner. Anyway, a mail won't be sent on every change, users would be spammed by Koha ;-) )
#
# Revision 1.115  2005/08/02 16:15:34  tipaul
# adding 2 fields to letter system :
# * module (acquisition, catalogue...) : it will be usefull to show the librarian only letters he may be interested by.
# * title, that will be used as mail subject.
#
# Revision 1.114  2005/07/28 15:10:13  tipaul
# Introducing new "Letters" system : Letters will be used everytime you want to sent something to someone (through mail or paper). For example, sending a mail for overdues use letter that you can put as parameters. Sending a mail to a borrower when a suggestion is validated uses a letter too.
# the letter table contains 3 fields :
# * code => the code of the letter
# * name => the complete name of the letter
# * content => the complete text. It's a TEXT field type, so has no limits.
#
# My next goal now is to work on point 2-I "serial issue alert"
# With this feature, in serials, a user can subscribe the "issue alert". For every issue arrived/missing, a mail is sent to all subscribers of this list. The mail warns the user that the issue is arrive or missing. Will be in head.
# (see mail on koha-devel, 2005/04/07)
#
# The "serial issue alert" will be the 1st to use this letter system that probably needs some tweaking ;-)
#
# Once it will be stabilised default letters (in any languages) could be added during installer to help the library begin with this new feature.
#
# Revision 1.113  2005/07/28 08:38:41  tipaul
# For instance, the return date does not rely on the borrower expiration date. A systempref will be added in Koha, to modify return date calculation schema :
# * ReturnBeforeExpiry = yes => return date can't be after expiry date
# * ReturnBeforeExpiry = no  => return date can be after expiry date
#
# Revision 1.112  2005/07/26 08:19:47  hdl
# Adding IndependantBranches System preference variable in order to manage Branch independancy.
#
# Revision 1.111  2005/07/25 15:35:38  tipaul
# we have decided that moving to Koha 3.0 requires being already in Koha 2.2.x
# So, the updatedatabase script can highly be cleaned (90% removed).
# Let's play with the new Koha DB structure now ;-)
#