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Annotation of loncom/cgi/metadata_keywords.pl, revision 1.2

1.1       harris41    1: #!/usr/bin/perl
                      2: #
                      3: # The LearningOnline Network with CAPA
                      4: #
                      5: # Gets keywords from metadata database.
                      6: #
                      7: # YEAR=2001
                      8: # 9/25 Scott Harrison
                      9: #
                     10: 
                     11: ###############################################################################
                     12: ##                                                                           ##
                     13: ## ORGANIZATION OF THIS PERL CGI SCRIPT                                      ##
                     14: ##                                                                           ##
                     15: ## 1. Status of this code                                                    ##
                     16: ## 2. Purpose and description of program                                     ##
                     17: ## 3. Modules used by this script                                            ##
                     18: ## 4. Print MIME Content-type and other initialization                       ##
                     19: ## 5. Make sure database can be accessed and that this is a library server   ##
                     20: ## 6. Loop through database records and print out keywords                   ##
                     21: ##                                                                           ##
                     22: ###############################################################################
                     23: 
                     24: # --------------------------------------------------------- Status of this code
                     25: #
                     26: # 1=horrible 2=poor 3=fair 4=good 5=excellent
                     27: # Organization 5
                     28: # Functionality 4
                     29: # Has it been tested? 3
                     30: #
                     31: 
                     32: # ------------------------------------------ Purpose and description of program
                     33: #
                     34: # This program outputs one line per database entry.
                     35: # The line is to be a list of keywords separated by commas.
                     36: # The file is to be output as a text file on a browser (text/plain).
                     37: # This provides initial data by which to study common and uncommon
                     38: # keywords being used.
                     39: # Note that the authoritative copy of metadata "keywords" is in the
                     40: # .meta files that are native to the library server.  We rely
                     41: # on the assumption that it is okay to use the MySQL server (which
                     42: # should reflect this information) instead.  This is a speedier approach.
                     43: 
                     44: # ------------------------------------------------- Modules used by this script
                     45: use strict;
                     46: use DBI;
                     47: 
                     48: # ---------------------------- Print MIME Content-type and other initialization
                     49: $|=1;
                     50: print 'Content-type: text/plain'."\n\n";
                     51: 
                     52: # --- Make sure that database can be accessed and that this is a library server
                     53: # library server test
                     54: my %perlvar;
                     55: open (CONFIG,"/etc/httpd/conf/access.conf") || 
                     56:     (print "Can't read access.conf\n" && exit);
                     57: while (my $configline=<CONFIG>) {
                     58:     if ($configline =~ /PerlSetVar/) {
                     59: 	my ($dummy,$varname,$varvalue)=split(/\s+/,$configline);
                     60:         chomp($varvalue);
                     61:         $perlvar{$varname}=$varvalue;
                     62:     }
                     63: }
                     64: close(CONFIG);
                     65: unless ($perlvar{'lonRole'} eq 'library') {
                     66:     print "This can only be run on a library server!\n";
                     67:     exit;
                     68: }
                     69: # database test
                     70: my $dbh;
                     71: {
                     72:     unless (
                     73: 	    $dbh = DBI->connect("DBI:mysql:loncapa","www",
                     74: 				$perlvar{'lonSqlAccess'},
                     75: 				{ RaiseError =>0,PrintError=>0})
                     76: 	    ) { 
                     77: 	print "Cannot connect to database!\n";
                     78: 	exit;
                     79:     }
                     80: }
                     81: %perlvar=(); # undefine it
                     82: 
                     83: # ------------------------ Loop through database records and print out keywords
                     84: my $sth=$dbh->prepare("select * from metadata");
                     85: $sth->execute();
                     86: my @row;
                     87: while (@row=$sth->fetchrow_array) {
1.2     ! harris41   88:     print $row[4]."\n";
1.1       harris41   89: }
                     90: 
                     91: # --------------------------------------------------- Close database connection
                     92: $dbh->disconnect();