/[cvs]/nfo/perl/libs/Data/Storage/Handler/Tangram.pm
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revision 1.39 by jonen, Fri Jun 6 11:40:40 2003 UTC revision 1.42 by joko, Tue Jul 1 23:24:17 2003 UTC
# Line 3  Line 3 
3  #  $Id$  #  $Id$
4  #  #
5  #  $Log$  #  $Log$
6    #  Revision 1.42  2003/07/01 23:24:17  joko
7    #  now using package before using function
8    #
9    #  Revision 1.41  2003/06/29 02:03:45  joko
10    #  fix:? initialize schema on startup
11    #
12    #  Revision 1.40  2003/06/25 22:57:54  joko
13    #  major rework of "sub sendQuery / sub getListFiltered": now should be capable of "sorting"
14    #
15  #  Revision 1.39  2003/06/06 11:40:40  jonen  #  Revision 1.39  2003/06/06 11:40:40  jonen
16  #  fixed bug at 'getFilteredList'  #  fixed bug at 'getFilteredList'
17  #  #
# Line 160  use base ("Data::Storage::Handler::Abstr Line 169  use base ("Data::Storage::Handler::Abstr
169    
170  use Data::Dumper;  use Data::Dumper;
171  use Tangram;  use Tangram;
172    use Class::Tangram;
173    
174  use DesignPattern::Object;  use DesignPattern::Object;
175  use Data::Storage::Result::Tangram;  use Data::Storage::Result::Tangram;
# Line 187  sub _initSchema { Line 197  sub _initSchema {
197    #if (!$schema_tangram) {    #if (!$schema_tangram) {
198      #my $obj = getNewPerlObjectByPkgName($self->{locator}->{schema}, { EXPORT_OBJECTS => $self->{locator}->{classnames}, want_transactions => $self->{locator}->{want_transactions} } );      #my $obj = getNewPerlObjectByPkgName($self->{locator}->{schema}, { EXPORT_OBJECTS => $self->{locator}->{classnames}, want_transactions => $self->{locator}->{want_transactions} } );
199      my $obj = DesignPattern::Object->fromPackage($self->{locator}->{schema}, { 'EXPORT_OBJECTS' => $self->{locator}->{classnames}, 'want_transactions' => $self->{locator}->{want_transactions} } );      my $obj = DesignPattern::Object->fromPackage($self->{locator}->{schema}, { 'EXPORT_OBJECTS' => $self->{locator}->{classnames}, 'want_transactions' => $self->{locator}->{want_transactions} } );
200      $schema_tangram = $obj->getSchema();      $schema_tangram = $obj->getSchema() if $obj;
201    #}    #}
202    if (!$schema_tangram) {    if (!$schema_tangram) {
203      $logger->error( __PACKAGE__ . "->_initSchema: No Schema available for $self->{schema}" );      $logger->error( __PACKAGE__ . "->_initSchema: No Schema available for $self->{locator}->{schema}." );
204      return 0;      return 0;
205    }    }
206    #$self->_patchSchema();    #$self->_patchSchema();
# Line 236  sub connect { Line 246  sub connect {
246  #      return;  #      return;
247  #    }  #    }
248    
249      #return unless $self->_initSchema();      return unless $self->_initSchema();
250      $self->_initSchema();      #$self->_initSchema();
251    
252      # create the main tangram storage object      # create the main tangram storage object
253      #$self->{COREHANDLE} = Tangram::Relational->connect( $schema, $dsn );      #$self->{COREHANDLE} = Tangram::Relational->connect( $schema, $dsn );
# Line 499  sub getListFiltered { Line 509  sub getListFiltered {
509    # redirect to unfiltered mode    # redirect to unfiltered mode
510    #return $self->getListUnfiltered(@_);    #return $self->getListUnfiltered(@_);
511    
512    my $nodename = shift;    my $in = {};
513    my $filters = shift;    $in->{nodename} = shift;
514      $in->{filters} = shift;
515      $in->{sorting} = shift;
516      
517    my @results;    my @results;
518    $logger->debug( __PACKAGE__ . "->getListFiltered( nodename => '" . $nodename . "' )" );    $logger->debug( __PACKAGE__ . "->getListFiltered( nodename => '" . $in->{nodename} . "' )" );
519    
520      #print Dumper($filters);
521    
522  #print Dumper($filters);    # 1. "Remote Object Handle" - get set of objects from odbms by object name
523      my $remote = $self->{_COREHANDLE}->remote($in->{nodename});
524      
525      # 2. Transfer $in to $orm_query
526      my $orm_query = {};
527        
528      # 2.a. Filters
529    my @tfilters;    my @tfilters;
530      my $orm_filter = undef;
531        
532    foreach my $filter (@$filters) {    foreach my $filter (@{$in->{filters}}) {
533        
534      # get filter - TODO: for each filter      # get filter - TODO: for each filter
535      #my $filter = $filters->[0];      #my $filter = $filters->[0];
536      
537      # build filter      # 1. The parts of a filter source entry
538      my $lexpr = $filter->{key};      my $lexpr = $filter->{key};
539      #my $op = $filter->{op};      #my $op = $filter->{op};
540      my $op = '=';      my $op = '=';
541      my $rexpr = $filter->{val};      my $rexpr = $filter->{val};
542      my $tight = 100;      my $tight = 100;
543    
544        # 2. Build filter target entry
545            
546    #  my $tfilter = Tangram::Filter->new(      # Test 1 - didn't work out!
547    #    expr => "t1.$lexpr $op '$rexpr'",      #  my $tfilter = Tangram::Filter->new(
548    #    tight => $tight,      #    expr => "t1.$lexpr $op '$rexpr'",
549    #    objects => $objects,      #    tight => $tight,
550    #  );      #    objects => $objects,
551          #  );
552    
553        my $orm_filter_tmp = undef;
554        # was:
555      # TODO: is_op?      # TODO: is_op?
556      # dispatch un-common operators if exists      # dispatch un-common operators if exists
557      if($filter->{op} eq "ref") {      if ($filter->{op} eq "ref") {
558        # do nothing, results will be filtered later cause 'tangram-filter' doesn't support 'ref' query        # do nothing, results will be filtered later cause 'tangram-filter' doesn't support 'ref' query
559        #print "Filter->op eq 'ref'.\n";        #print "Filter->op eq 'ref'.\n";
560        #push @tfilters, 'ref($remote->{' . $filter->{key} . '})' . " eq '$filter->{val}'";        #push @tfilters, 'ref($remote->{' . $filter->{key} . '})' . " eq '$filter->{val}'";
561      } else {      } else {
562        # HACK: build eval-string (sorry) to get filtered list - please give advice here        # HACK: build eval-string (sorry) to get filtered list - please give advice here
563        push @tfilters, '$remote->{' . $filter->{key} . '}' . " $filter->{op} '$filter->{val}'";        #push @tfilters, '$remote->{' . $filter->{key} . '}' . " $filter->{op} '$filter->{val}'";
564          # better: calculate expression right here!
565          #push @tfilters, '$remote->{' . $filter->{key} . '}' . " $filter->{op} '$filter->{val}'";
566          
567          #print "key: ", $filter->{key}, "\n";
568          
569          my $left = $remote->{$filter->{key}};
570          #my $r = Tangram::Expr->new( 'string' => "'" . $filter->{val} . "'" );
571          my $right = $filter->{val};
572          my $op = $filter->{op};
573          $orm_filter_tmp = $left->$op($right);
574        }
575    
576        if (not $orm_filter) {
577          $orm_filter = $orm_filter_tmp;
578        } else {
579          $orm_filter = $orm_filter->and($orm_filter_tmp);
580      }      }
581    
582    }    }
583    
584    my $tfilter = join(' & ', @tfilters);    $orm_query->{filter} = $orm_filter;
585    
   # get set of objects from odbms by object name  
   my $remote = $self->{_COREHANDLE}->remote($nodename);  
     
586    # was:    # was:
   #@results = $self->{COREHANDLE}->select($object_set, $tfilter);  
587    
588    # is:    # 2.b. sorting [new as of 2003-06-17]
589    # HACK: build eval-string (sorry) to get filtered list - please give advice here    if ($in->{sorting}) {
590    my $evalstring = 'return $self->{_COREHANDLE}->select($remote, ' . $tfilter . ');';      my $sorting_rules = [];
591          my $sorting_order = 'ASC';
592    #print "eval: $evalstring", "\n";      foreach my $sorting_column (keys %{$in->{sorting}}) {
593          $sorting_order = $in->{sorting}->{$sorting_column} if $in->{sorting}->{$sorting_column};
594          push @$sorting_rules, Tangram::Expr->new( 'string' => $sorting_column );
595        }
596        $orm_query->{order} = $sorting_rules;
597        if ($sorting_order eq 'DESC') {
598          $orm_query->{desc} = 1;
599        }
600      }
601    
602    
603      # 3. build and issue query - return result as Tangram::Cursor
604        
605    # get filtered list/set    # coerce hash into array (This is valid in Perl)
606    @results = eval($evalstring);    my @orm_query_args = %$orm_query;
607    die $@ if $@;    # send query (arguments) to orm
608      @results = $self->{_COREHANDLE}->select($remote, @orm_query_args);
609        
610      #my $cursor = $self->{_COREHANDLE}->cursor($remote, @orm_query_args);
611      #return $cursor;
612      #print Dumper(@results);
613    
614      # is:
615      # HACK: build eval-string (sorry) to get filtered list - please give advice here
616        #my $evalstring = 'return $self->{_COREHANDLE}->select($remote, ' . $tfilter . $sorting . ');';
617        #print "eval: $evalstring", "\n";
618        # get filtered list/set
619        #@results = eval($evalstring);
620        #die $@ if $@;
621    
622    =pod
623    # filter results    # filter results
624    if($filters->[0]->{op} eq "ref") {    if ($filters->[0]->{op} && ($filters->[0]->{op} eq "ref")) {
625        #print "Filter->op eq 'ref'.\n";        #print "Filter->op eq 'ref'.\n";
626        my $att_name = $filters->[0]->{key};        my $att_name = $filters->[0]->{key};
627        my $att_val = $filters->[0]->{val};        my $att_val = $filters->[0]->{val};
# Line 571  sub getListFiltered { Line 633  sub getListFiltered {
633        }        }
634        @results = @filtered;        @results = @filtered;
635    }    }
636    =cut
637    
638    #print "results: " . Dumper(\@results);    #print "results: " . Dumper(\@results);
639        
# Line 602  sub createSet { Line 665  sub createSet {
665    return $result;    return $result;
666  }  }
667    
668    sub createResult {
669      my $self = shift;
670      my $rh = shift;
671      my $result = Data::Storage::Result::Tangram->new( RESULTHANDLE => $rh );
672      return $result;
673    }
674    
675  sub sendQuery {  sub sendQuery {
676    my $self = shift;    my $self = shift;
677    my $query = shift;    my $query = shift;
# Line 693  sub sendQuery { Line 763  sub sendQuery {
763    
764      if ($crud eq 'RETRIEVE') {      if ($crud eq 'RETRIEVE') {
765    
766        my $list = $self->getListFiltered($query->{node}, $query->{criterias});        my $list = $self->getListFiltered($query->{node}, $query->{criterias}, $query->{sorting});
767          #return $list;
768          return $self->createResult($list);
769          
770        #return $self->createSet($object);        #return $self->createSet($object);
771        #return $self->createSet($list);        #return $self->createSet($list);
772        return $self->createSet(@$list);        return $self->createSet(@$list);
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