version 1.42, 2001/03/20 11:45:21
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version 1.45, 2001/03/21 00:32:33
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Line 31
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Line 31
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# server reference, |
# server reference, |
# environment reference, |
# environment reference, |
# reply list reference) : outputs results from search |
# reply list reference) : outputs results from search |
# build_SQL_query() : builds a SQL query string from a logical expression |
# build_SQL_query(field name, logic) : builds a SQL query string from a |
# with AND/OR keywords |
# logical expression with AND/OR keywords |
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# recursive_SQL_query_build(field name, reverse notation expression) : |
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# builds a SQL query string from a reverse notation expression |
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# logical expression with AND/OR keywords |
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package Apache::lonsearchcat; |
package Apache::lonsearchcat; |
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Line 445 sub selectbox {
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Line 448 sub selectbox {
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return $selout.'</select>'; |
return $selout.'</select>'; |
} |
} |
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# ------------------------------------------------ Performing a advanced search |
# ----------------------------------------------- Performing an advanced search |
sub advancedsearch { |
sub advancedsearch { |
my ($r,$envhash)=@_; |
my ($r,$envhash)=@_; |
my %ENV=%{$envhash}; |
my %ENV=%{$envhash}; |
Line 465 sub advancedsearch {
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Line 468 sub advancedsearch {
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} |
} |
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my $query=''; |
my $query=''; |
# my $concatarg=join('," ",', |
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# ('title', 'author', 'subject', 'notes', 'abstract')); |
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$query="select * from metadata where concat(title) like '\%$ENV{'form.title'}\%'"; |
my @queries; |
my $reply=&Apache::lonnet::metadata_query($query); |
# Go through logical expression AND/OR/NOT phrase fields. |
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foreach my $field ('title','author','subject','notes','abstract') { |
&output_results($r,$envhash,$reply); |
if ($ENV{'form.'.$field}) { |
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push @queries,&build_SQL_query($field,$ENV{'form.'.$field}); |
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} |
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} |
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if (@queries) { |
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$query="(" . (join(") and ("),@queries) . ")"; |
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$query="select * from metadata where $testquery"; |
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my $reply=&Apache::lonnet::metadata_query($query); |
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&output_results('Advanced',$r,$envhash,$query,$reply); |
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} |
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else { |
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&output_results('Advanced',$r,$envhash,$query); |
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} |
return OK; |
return OK; |
} |
} |
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Line 502 sub basicsearch {
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Line 515 sub basicsearch {
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$query="select * from metadata where concat($concatarg) like '\%$ENV{'form.basicexp'}\%'"; |
$query="select * from metadata where concat($concatarg) like '\%$ENV{'form.basicexp'}\%'"; |
my $reply=&Apache::lonnet::metadata_query($query); |
my $reply=&Apache::lonnet::metadata_query($query); |
&output_results($r,$envhash,$reply); |
&output_results('Basic',$r,$envhash,$query,$reply); |
return OK; |
return OK; |
} |
} |
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# ---------------- Message to output when there are not enough fields filled in |
sub output_blank_field_error { |
sub output_blank_field_error { |
my ($r)=@_; |
my ($r)=@_; |
# make query information persistent to allow for subsequent revision |
# make query information persistent to allow for subsequent revision |
Line 552 RESULTS
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Line 566 RESULTS
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# ----------------------------- format and output results based on a reply list |
# ----------------------------- format and output results based on a reply list |
sub output_results { |
sub output_results { |
my ($r,$envhash,@replylist)=@_; |
my ($mode,$r,$envhash,$query,@replylist)=@_; |
my %ENV=%{$envhash}; |
my %ENV=%{$envhash}; |
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my $compiledresult=''; |
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foreach my $reply (@replylist) { |
foreach my $reply (@replylist) { |
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my @results; |
my @results; |
Line 576 sub output_results {
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Line 592 sub output_results {
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@results=<$fh>; |
@results=<$fh>; |
} |
} |
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my $compiledresult=''; |
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foreach my $result (@results) { |
foreach my $result (@results) { |
my ($title,$author,$subject,$url,$keywords,$version, |
my ($title,$author,$subject,$url,$keywords,$version, |
$notes,$abstract,$mime,$lang, |
$notes,$abstract,$mime,$lang, |
Line 667 onClick='self.close();'>
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Line 681 onClick='self.close();'>
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$persistent |
$persistent |
<hr> |
<hr> |
<h3>Search Query</h3> |
<h3>Search Query</h3> |
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RESULTS |
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if ($mode eq 'Basic') { |
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$r->print(<<RESULTS); |
<p> |
<p> |
<b>Basic search:</b> $ENV{'form.basicexp'} |
<b>Basic search:</b> $ENV{'form.basicexp'} |
</p> |
</p> |
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RESULTS |
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} |
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elsif ($mode eq 'Advanced') { |
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$r->print(<<RESULTS); |
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<p> |
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<b>Advanced search</b> |
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$query |
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</p> |
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RESULTS |
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} |
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$r->print(<<RESULTS); |
<h3>Search Results</h3> |
<h3>Search Results</h3> |
$compiledresult |
$compiledresult |
</body> |
</body> |
Line 680 RESULTS
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Line 708 RESULTS
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# ------------------------------------------------------------- build_SQL_query |
# ------------------------------------------------------------- build_SQL_query |
sub build_SQL_query { |
sub build_SQL_query { |
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my ($field_name,$logic_statement)=@_; |
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my $q=new Text::Query('abc', |
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-parse => 'Text::Query::ParseAdvanced', |
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-build => 'Text::Query::Build'); |
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$q->prepare($logic_statement); |
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my $matchexp=${$q}{'matchexp'}; chomp $matchexp; |
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my $sql_query=&recursive_SQL_query_build($field_name,$matchexp); |
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return $sql_query; |
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} |
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# - Recursively parse a reverse notation expression into a SQL query expression |
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sub recursive_SQL_query_build { |
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my ($dkey,$pattern)=@_; |
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my @matches=($pattern=~/(\[[^\]|\[]*\])/g); |
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return $pattern unless @matches; |
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foreach my $match (@matches) { |
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$match=~/\[ (\w+)\s(.*) \]/; |
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my ($key,$value)=($1,$2); |
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my $replacement=''; |
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if ($key eq 'literal') { |
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$replacement="($dkey like \"\%$value\%\")"; |
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} |
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elsif ($key eq 'and') { |
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$value=~/(.*[\"|\)]) ([|\(|\^].*)/; |
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$replacement="($1 AND $2)"; |
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} |
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elsif ($key eq 'or') { |
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$value=~/(.*[\"|\)]) ([|\(|\^].*)/; |
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$replacement="($1 OR $2)"; |
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} |
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substr($pattern, |
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index($pattern,$match), |
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length($match), |
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$replacement |
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); |
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} |
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&recursive_SQL_query_build($dkey,$pattern); |
} |
} |
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1; |
1; |