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Annotation of loncom/cgi/metadata_keywords.pl, revision 1.7

1.1       harris41    1: #!/usr/bin/perl
1.6       albertel    2: # Gets keywords from metadata database.
1.7     ! raeburn     3: # $Id: metadata_keywords.pl,v 1.6 2003/09/01 03:37:27 albertel Exp $
1.6       albertel    4: #
                      5: # Copyright Michigan State University Board of Trustees
                      6: #
                      7: # This file is part of the LearningOnline Network with CAPA (LON-CAPA).
1.1       harris41    8: #
1.6       albertel    9: # LON-CAPA is free software; you can redistribute it and/or modify
                     10: # it under the terms of the GNU General Public License as published by
                     11: # the Free Software Foundation; either version 2 of the License, or
                     12: # (at your option) any later version.
1.1       harris41   13: #
1.6       albertel   14: # LON-CAPA is distributed in the hope that it will be useful,
                     15: # but WITHOUT ANY WARRANTY; without even the implied warranty of
                     16: # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
                     17: # GNU General Public License for more details.
                     18: #
                     19: # You should have received a copy of the GNU General Public License
                     20: # along with LON-CAPA; if not, write to the Free Software
                     21: # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
1.1       harris41   22: #
1.6       albertel   23: # /home/httpd/html/adm/gpl.txt
1.1       harris41   24: #
1.6       albertel   25: # http://www.lon-capa.org/
1.3       harris41   26: #
1.6       albertel   27: 
1.1       harris41   28: 
                     29: ###############################################################################
                     30: ##                                                                           ##
                     31: ## ORGANIZATION OF THIS PERL CGI SCRIPT                                      ##
                     32: ##                                                                           ##
                     33: ## 1. Status of this code                                                    ##
                     34: ## 2. Purpose and description of program                                     ##
                     35: ## 3. Modules used by this script                                            ##
                     36: ## 4. Print MIME Content-type and other initialization                       ##
                     37: ## 5. Make sure database can be accessed and that this is a library server   ##
                     38: ## 6. Loop through database records and print out keywords                   ##
                     39: ##                                                                           ##
                     40: ###############################################################################
                     41: 
                     42: # --------------------------------------------------------- Status of this code
                     43: #
                     44: # 1=horrible 2=poor 3=fair 4=good 5=excellent
                     45: # Organization 5
                     46: # Functionality 4
1.3       harris41   47: # Has it been tested? 4
1.1       harris41   48: #
                     49: 
                     50: # ------------------------------------------ Purpose and description of program
                     51: #
                     52: # This program outputs one line per database entry.
                     53: # The line is to be a list of keywords separated by commas.
                     54: # The file is to be output as a text file on a browser (text/plain).
                     55: # This provides initial data by which to study common and uncommon
                     56: # keywords being used.
                     57: # Note that the authoritative copy of metadata "keywords" is in the
                     58: # .meta files that are native to the library server.  We rely
                     59: # on the assumption that it is okay to use the MySQL server (which
                     60: # should reflect this information) instead.  This is a speedier approach.
                     61: 
                     62: # ------------------------------------------------- Modules used by this script
1.3       harris41   63: 
                     64: 
1.7     ! raeburn    65: $|=1;
1.1       harris41   66: use strict;
                     67: use DBI;
1.7     ! raeburn    68: use lib '/home/httpd/lib/perl/';
        !            69: use Apache::lonlocal;
        !            70: use LONCAPA::Configuration;
        !            71: use LONCAPA::loncgi;
1.1       harris41   72: 
                     73: # ---------------------------- Print MIME Content-type and other initialization
                     74: print 'Content-type: text/plain'."\n\n";
                     75: 
1.7     ! raeburn    76: &main();
        !            77: 
        !            78: sub main {
        !            79:     if (!&LONCAPA::loncgi::check_ipbased_access('metadatakeywords')) {
        !            80:         if (!&LONCAPA::loncgi::check_cookie_and_load_env()) {
        !            81:             &Apache::lonlocal::get_language_handle();
        !            82:             print(&LONCAPA::loncgi::missing_cookie_msg());
        !            83:             return;
        !            84:         }
        !            85: 
        !            86:         if (!&LONCAPA::loncgi::can_view('metadata_keywords')) {
        !            87:             &Apache::lonlocal::get_language_handle();
        !            88:             print(&LONCAPA::loncgi::unauthorized_msg('metadata_keywords'));
        !            89:             return;
        !            90:         }
        !            91:     }
        !            92: 
        !            93:     &Apache::lonlocal::get_language_handle();
        !            94: 
1.1       harris41   95: # --- Make sure that database can be accessed and that this is a library server
                     96: # library server test
1.4       harris41   97: 
                     98: # By default, loncapa_apache.conf is also read by the read_conf subroutine.
1.7     ! raeburn    99:     my $perlvarref=LONCAPA::Configuration::read_conf('loncapa.conf');
        !           100:     my %perlvar=%{$perlvarref};
        !           101:     undef($perlvarref);
        !           102: 
        !           103:     unless ($perlvar{'lonRole'} eq 'library') {
        !           104:          print(&Apache::lonlocal::mt('This can only be run on a library server!)."\n");
        !           105:          return;
        !           106:     }
        !           107: 
1.1       harris41  108: # database test
1.7     ! raeburn   109:     my $dbh;
        !           110:     {
        !           111:         unless (
        !           112:     	        $dbh = DBI->connect("DBI:mysql:loncapa","www",
        !           113: 				    $perlvar{'lonSqlAccess'},
        !           114: 				    { RaiseError =>0,PrintError=>0})
        !           115: 	       ) { 
        !           116: 	    print "Cannot connect to database!\n";
        !           117: 	    return;
        !           118:         }
1.1       harris41  119:     }
1.7     ! raeburn   120:     %perlvar=(); # undefine it
1.1       harris41  121: 
                    122: # ------------------------ Loop through database records and print out keywords
1.7     ! raeburn   123:     my $sth=$dbh->prepare("select * from metadata");
        !           124:     $sth->execute();
        !           125:     my @row;
        !           126:     while (@row=$sth->fetchrow_array) {
        !           127:         print $row[4]."\n";
        !           128:     }
1.1       harris41  129: 
                    130: # --------------------------------------------------- Close database connection
1.7     ! raeburn   131:     $dbh->disconnect();
        !           132:     return;
        !           133: }