version 1.4, 2004/04/08 14:50:44
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version 1.10, 2004/06/11 19:52:12
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Line 133 my @Metadata_Table_Description =
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Line 133 my @Metadata_Table_Description =
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{ name => 'avetries_list', type=>'TEXT'}, |
{ name => 'avetries_list', type=>'TEXT'}, |
{ name => 'difficulty', type=>'FLOAT'}, |
{ name => 'difficulty', type=>'FLOAT'}, |
{ name => 'difficulty_list',type=>'TEXT'}, |
{ name => 'difficulty_list',type=>'TEXT'}, |
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{ name => 'disc', type=>'FLOAT'}, |
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{ name => 'disc_list', type=>'TEXT'}, |
{ name => 'clear', type=>'FLOAT'}, |
{ name => 'clear', type=>'FLOAT'}, |
{ name => 'technical', type=>'FLOAT'}, |
{ name => 'technical', type=>'FLOAT'}, |
{ name => 'correct', type=>'FLOAT'}, |
{ name => 'correct', type=>'FLOAT'}, |
Line 283 sub create_statement_handler {
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Line 285 sub create_statement_handler {
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sub clear_sth { $sth=undef; $sth_table=undef;} |
sub clear_sth { $sth=undef; $sth_table=undef;} |
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sub store_metadata { |
sub store_metadata { |
my $dbh = shift(); |
my ($dbh,$tablename,@Metadata)=@_; |
my $tablename = shift(); |
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my $errors = ''; |
my $errors = ''; |
if (! defined($sth) || |
if (! defined($sth) || |
( defined($tablename) && ($sth_table ne $tablename)) || |
( defined($tablename) && ($sth_table ne $tablename)) || |
Line 292 sub store_metadata {
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Line 293 sub store_metadata {
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&create_statement_handler($dbh,$tablename); |
&create_statement_handler($dbh,$tablename); |
} |
} |
my $successcount = 0; |
my $successcount = 0; |
while (my $mdata = shift()) { |
foreach my $mdata (@Metadata) { |
next if (ref($mdata) ne "HASH"); |
next if (ref($mdata) ne "HASH"); |
my @MData; |
my @MData; |
foreach my $field (@Metadata_Table_Description) { |
foreach my $field (@Metadata_Table_Description) { |
if (exists($mdata->{$field->{'name'}})) { |
my $fname = $field->{'name'}; |
push(@MData,$mdata->{$field->{'name'}}); |
if (exists($mdata->{$fname}) && |
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defined($mdata->{$fname}) && |
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$mdata->{$fname} ne '') { |
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if ($mdata->{$fname} eq 'nan' || |
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$mdata->{$fname} eq '') { |
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push(@MData,'NULL'); |
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} else { |
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push(@MData,$mdata->{$fname}); |
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} |
} else { |
} else { |
push(@MData,undef); |
push(@MData,undef); |
} |
} |
Line 308 sub store_metadata {
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Line 317 sub store_metadata {
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} else { |
} else { |
$errors = join(',',$errors,$sth->errstr); |
$errors = join(',',$errors,$sth->errstr); |
} |
} |
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$errors =~ s/^,//; |
} |
} |
if (wantarray()) { |
if (wantarray()) { |
return ($successcount,$errors); |
return ($successcount,$errors); |
Line 336 The array reference is the same one retu
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Line 346 The array reference is the same one retu
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###################################################################### |
###################################################################### |
###################################################################### |
###################################################################### |
sub lookup_metadata { |
sub lookup_metadata { |
my ($dbh,$condition,$fetchparameter) = @_; |
my ($dbh,$condition,$fetchparameter,$tablename) = @_; |
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$tablename = 'metadata' if (! defined($tablename)); |
my $error; |
my $error; |
my $returnvalue=[]; |
my $returnvalue=[]; |
my $request = 'SELECT * FROM metadata'; |
my $request = 'SELECT * FROM '.$tablename; |
if (defined($condition)) { |
if (defined($condition)) { |
$request .= ' WHERE '.$condition; |
$request .= ' WHERE '.$condition; |
} |
} |
Line 368 sub lookup_metadata {
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Line 379 sub lookup_metadata {
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=item delete_metadata() |
=item delete_metadata() |
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Removes a single metadata record, based on its url. |
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Inputs: $dbh, the database handler. |
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$tablename, the name of the metadata table to remove from. default: 'metadata' |
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$url, the url of the resource to remove from the metadata database. |
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Returns: undef on success, dbh errorstr on failure. |
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=cut |
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###################################################################### |
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###################################################################### |
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sub delete_metadata { |
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my ($dbh,$tablename,$url) = @_; |
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$tablename = 'metadata' if (! defined($tablename)); |
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my $error; |
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my $delete_command = 'DELETE FROM '.$tablename.' WHERE url='. |
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$dbh->quote($url); |
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$dbh->do($delete_command); |
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if ($dbh->err) { |
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$error = $dbh->errstr(); |
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} |
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return $error; |
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} |
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###################################################################### |
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###################################################################### |
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=pod |
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=item update_metadata |
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Updates metadata record in mysql database. It does not matter if the record |
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currently exists. Fields not present in the new metadata will be taken |
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from the current record, if it exists. To delete an entry for a key, set |
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it to "" or undef. |
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Inputs: |
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$dbh, database handle |
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$newmetadata, hash reference containing the new metadata |
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$tablename, metadata table name. Defaults to 'metadata'. |
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Returns: |
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$error on failure. undef on success. |
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=cut |
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###################################################################### |
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###################################################################### |
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sub update_metadata { |
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my ($dbh,$tablename,$newmetadata)=@_; |
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my $error; |
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$tablename = 'metadata' if (! defined($tablename)); |
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if (! exists($newmetadata->{'url'})) { |
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$error = 'Unable to update: no url specified'; |
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} |
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return $error if (defined($error)); |
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# |
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# Retrieve current values |
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my $row; |
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($error,$row) = &lookup_metadata($dbh, |
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' url='.$dbh->quote($newmetadata->{'url'}), |
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undef,$tablename); |
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return $error if ($error); |
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my %metadata = &LONCAPA::lonmetadata::metadata_col_to_hash(@{$row->[0]}); |
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# |
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# Update metadata values |
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while (my ($key,$value) = each(%$newmetadata)) { |
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$metadata{$key} = $value; |
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} |
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# |
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# Delete old data (deleting a nonexistant record does not produce an error. |
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$error = &delete_metadata($dbh,$tablename,$newmetadata->{'url'}); |
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return $error if (defined($error)); |
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# |
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# Store updated metadata |
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my $success; |
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($success,$error) = &store_metadata($dbh,$tablename,\%metadata); |
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return $error; |
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} |
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###################################################################### |
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###################################################################### |
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=pod |
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=item metdata_col_to_hash |
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Input: Array of metadata columns |
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Return: Hash with the metadata columns as keys and the array elements |
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passed in as values |
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=cut |
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###################################################################### |
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###################################################################### |
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sub metadata_col_to_hash { |
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my @cols=@_; |
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my %hash=(); |
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for (my $i=0; $i<=$#Metadata_Table_Description;$i++) { |
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$hash{$Metadata_Table_Description[$i]->{'name'}}=$cols[$i]; |
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} |
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return %hash; |
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} |
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###################################################################### |
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###################################################################### |
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=pod |
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=item nohist_resevaldata.db data structure |
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The nohist_resevaldata.db file has the following possible keys: |
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Statistics Data (values are integers, perl times, or real numbers) |
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------------------------------------------ |
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$course___$resource___avetries |
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$course___$resource___count |
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$course___$resource___difficulty |
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$course___$resource___stdno |
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$course___$resource___timestamp |
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Evaluation Data (values are on a 1 to 5 scale) |
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------------------------------------------ |
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$username@$dom___$resource___clear |
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$username@$dom___$resource___comments |
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$username@$dom___$resource___depth |
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$username@$dom___$resource___technical |
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$username@$dom___$resource___helpful |
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Course Context Data |
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------------------------------------------ |
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$course___$resource___course course id |
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$course___$resource___comefrom resource preceeding this resource |
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$course___$resource___goto resource following this resource |
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$course___$resource___usage resource containing this resource |
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New statistical data storage |
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------------------------------------------ |
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$course&$sec&$numstud___$resource___stats |
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$sec is a string describing the sections: all, 1 2, 1 2 3,... |
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Value is a '&' deliminated list of key=value pairs. |
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Possible keys are (currently) disc,course,sections,difficulty, |
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stdno, timestamp |
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=cut |
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###################################################################### |
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###################################################################### |
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=pod |
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=item &process_reseval_data |
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Process a nohist_resevaldata hash into a more complex data structure. |
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Input: Hash reference containing reseval data |
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Returns: Hash with the following structure: |
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$hash{$url}->{'statistics'}->{$courseid}->{'avetries'} = $value |
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$hash{$url}->{'statistics'}->{$courseid}->{'count'} = $value |
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$hash{$url}->{'statistics'}->{$courseid}->{'difficulty'} = $value |
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$hash{$url}->{'statistics'}->{$courseid}->{'stdno'} = $value |
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$hash{$url}->{'statistics'}->{$courseid}->{'timestamp'} = $value |
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$hash{$url}->{'evaluation'}->{$username}->{'clear'} = $value |
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$hash{$url}->{'evaluation'}->{$username}->{'comments'} = $value |
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$hash{$url}->{'evaluation'}->{$username}->{'depth'} = $value |
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$hash{$url}->{'evaluation'}->{$username}->{'technical'} = $value |
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$hash{$url}->{'evaluation'}->{$username}->{'helpful'} = $value |
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$hash{$url}->{'course'} = \@Courses |
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$hash{$url}->{'comefrom'} = \@Resources |
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$hash{$url}->{'goto'} = \@Resources |
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$hash{$url}->{'usage'} = \@Resources |
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$hash{$url}->{'stats'}->{$courseid\_$section}->{$key} = $value |
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=cut |
=cut |
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###################################################################### |
###################################################################### |
###################################################################### |
###################################################################### |
sub delete_metadata {} |
sub process_reseval_data { |
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my ($evaldata) = @_; |
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my %DynamicData; |
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# |
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# Process every stored element |
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while (my ($storedkey,$value) = each(%{$evaldata})) { |
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my ($source,$file,$type) = split('___',$storedkey); |
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$source = &unescape($source); |
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$file = &unescape($file); |
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$value = &unescape($value); |
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" got ".$file."\n ".$type." ".$source."\n"; |
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if ($type =~ /^(avetries|count|difficulty|stdno|timestamp)$/) { |
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# |
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# Statistics: $source is course id |
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$DynamicData{$file}->{'statistics'}->{$source}->{$type}=$value; |
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} elsif ($type =~ /^(clear|comments|depth|technical|helpful)$/){ |
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# |
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# Evaluation $source is username, check if they evaluated it |
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# more than once. If so, pad the entry with a space. |
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while(exists($DynamicData{$file}->{'evaluation'}->{$type}->{$source})) { |
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$source .= ' '; |
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} |
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$DynamicData{$file}->{'evaluation'}->{$type}->{$source}=$value; |
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} elsif ($type =~ /^(course|comefrom|goto|usage)$/) { |
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# |
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# Context $source is course id or resource |
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push(@{$DynamicData{$file}->{$type}},&unescape($source)); |
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} elsif ($type eq 'stats') { |
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# |
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# Statistics storage... |
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# $source is $cid\_$sec\_$stdno |
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# $value is stat1=value&stat2=value&stat3=value,.... |
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# |
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my ($cid,$sec,$stdno)=split('&',$source); |
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my $crssec = $cid.'&'.$sec; |
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my @Data = split('&',$value); |
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my %Statistics; |
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while (my ($key,$value) = split('=',pop(@Data))) { |
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$Statistics{$key} = $value; |
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} |
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$sec =~ s:("$|^")::g; |
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$Statistics{'sections'} = $sec; |
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# |
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# Only store the data if the number of students is greater |
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# than the data already stored |
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if (! exists($DynamicData{$file}->{'stats'}->{$crssec}) || |
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$DynamicData{$file}->{'stats'}->{$crssec}->{'stdno'}<$stdno){ |
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$DynamicData{$file}->{'stats'}->{$crssec}=\%Statistics; |
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} |
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} |
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} |
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return %DynamicData; |
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} |
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###################################################################### |
###################################################################### |
###################################################################### |
###################################################################### |
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=pod |
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=item &process_dynamic_metadata |
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Inputs: $url: the url of the item to process |
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$DynamicData: hash reference for the results of &process_reseval_data |
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Returns: Hash containing the following keys: |
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avetries, avetries_list, difficulty, difficulty_list, stdno, stdno_list, |
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course, course_list, goto, goto_list, comefrom, comefrom_list, |
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usage, clear, technical, correct, helpful, depth, comments |
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Each of the return keys is associated with either a number or a string |
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The *_list items are comma-seperated strings. 'comments' is a string |
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containing generically marked-up comments. |
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=cut |
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###################################################################### |
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###################################################################### |
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sub process_dynamic_metadata { |
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my ($url,$DynamicData) = @_; |
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my %data; |
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my $resdata = $DynamicData->{$url}; |
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# |
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# Get the statistical data - Use a weighted average |
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foreach my $type (qw/avetries difficulty disc/) { |
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my $studentcount; |
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my $sum; |
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my @Values; |
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my @Students; |
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# |
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# Old data |
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foreach my $coursedata (values(%{$resdata->{'statistics'}}), |
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values(%{$resdata->{'stats'}})) { |
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if (ref($coursedata) eq 'HASH' && exists($coursedata->{$type})) { |
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$studentcount += $coursedata->{'stdno'}; |
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$sum += ($coursedata->{$type}*$coursedata->{'stdno'}); |
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push(@Values,$coursedata->{$type}); |
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push(@Students,$coursedata->{'stdno'}); |
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} |
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} |
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if (exists($resdata->{'stats'})) { |
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foreach my $identifier (sort(keys(%{$resdata->{'stats'}}))) { |
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my $coursedata = $resdata->{'stats'}->{$identifier}; |
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$studentcount += $coursedata->{'stdno'}; |
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$sum += $coursedata->{$type}*$coursedata->{'stdno'}; |
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push(@Values,$coursedata->{$type}); |
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push(@Students,$coursedata->{'stdno'}); |
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} |
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} |
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# |
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# New data |
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if (defined($studentcount) && $studentcount>0) { |
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$data{$type} = $sum/$studentcount; |
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$data{$type.'_list'} = join(',',@Values); |
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} |
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} |
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# |
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# Find out the number of students who have completed the resource... |
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my $stdno; |
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foreach my $coursedata (values(%{$resdata->{'statistics'}}), |
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values(%{$resdata->{'stats'}})) { |
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if (ref($coursedata) eq 'HASH' && exists($coursedata->{'stdno'})) { |
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$stdno += $coursedata->{'stdno'}; |
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} |
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} |
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if (exists($resdata->{'stats'})) { |
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# |
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# For the number of students, take the maximum found for the class |
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my $current_course; |
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my $coursemax=0; |
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foreach my $identifier (sort(keys(%{$resdata->{'stats'}}))) { |
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my $coursedata = $resdata->{'stats'}->{$identifier}; |
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if (! defined($current_course)) { |
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$current_course = $coursedata->{'course'}; |
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} |
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if ($current_course ne $coursedata->{'course'}) { |
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$stdno += $coursemax; |
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$coursemax = 0; |
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$current_course = $coursedata->{'course'}; |
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} |
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if ($coursemax < $coursedata->{'stdno'}) { |
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$coursemax = $coursedata->{'stdno'}; |
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} |
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} |
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$stdno += $coursemax; # pick up the final course in the list |
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} |
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$data{'stdno'}=$stdno; |
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# |
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# Get the context data |
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foreach my $type (qw/course goto comefrom/) { |
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if (defined($resdata->{$type}) && |
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ref($resdata->{$type}) eq 'ARRAY') { |
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$data{$type} = scalar(@{$resdata->{$type}}); |
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$data{$type.'_list'} = join(',',@{$resdata->{$type}}); |
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} |
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} |
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if (defined($resdata->{'usage'}) && |
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ref($resdata->{'usage'}) eq 'ARRAY') { |
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$data{'sequsage'} = scalar(@{$resdata->{'usage'}}); |
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$data{'sequsage_list'} = join(',',@{$resdata->{'usage'}}); |
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} |
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# |
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# Get the evaluation data |
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foreach my $type (qw/clear technical correct helpful depth/) { |
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my $count; |
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my $sum; |
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foreach my $evaluator (keys(%{$resdata->{'evaluation'}->{$type}})){ |
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$sum += $resdata->{'evaluation'}->{$type}->{$evaluator}; |
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$count++; |
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} |
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if ($count > 0) { |
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$data{$type}=$sum/$count; |
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} |
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} |
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# |
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# put together comments |
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my $comments = '<div class="LCevalcomments">'; |
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foreach my $evaluator (keys(%{$resdata->{'evaluation'}->{'comments'}})){ |
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$comments .= |
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'<p>'. |
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'<b>'.$evaluator.'</b>:'. |
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$resdata->{'evaluation'}->{'comments'}->{$evaluator}. |
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'</p>'; |
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} |
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$comments .= '</div>'; |
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$data{'comments'} = $comments; |
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# |
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if (exists($resdata->{'stats'})) { |
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$data{'stats'} = $resdata->{'stats'}; |
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} |
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# |
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return %data; |
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} |
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sub dynamic_metadata_storage { |
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my ($data) = @_; |
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my %Store; |
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my $courseid = $data->{'course'}; |
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my $sections = $data->{'sections'}; |
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my $numstu = $data->{'num_students'}; |
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my $urlres = $data->{'urlres'}; |
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my $key = $courseid.'&'.$sections.'&'.$numstu.'___'.$urlres.'___stats'; |
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$Store{$key} = |
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'course='.$courseid.'&'. |
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'sections='.$sections.'&'. |
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'timestamp='.time.'&'. |
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'stdno='.$data->{'num_students'}.'&'. |
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'avetries='.$data->{'mean_tries'}.'&'. |
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'difficulty='.$data->{'deg_of_diff'}; |
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if (exists($data->{'deg_of_disc'})) { |
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$Store{$key} .= '&'.'disc='.$data->{'deg_of_disc'}; |
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} |
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return %Store; |
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} |
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###################################################################### |
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###################################################################### |
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## |
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## The usual suspects, repeated here to reduce dependency hell |
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## |
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###################################################################### |
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###################################################################### |
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sub unescape { |
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my $str=shift; |
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$str =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg; |
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return $str; |
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} |
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sub escape { |
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my $str=shift; |
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$str =~ s/(\W)/"%".unpack('H2',$1)/eg; |
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return $str; |
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} |
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1; |
1; |
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__END__; |
__END__; |