/[cvs]/nfo/perl/libs/Data/Storage/Handler/Tangram.pm
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revision 1.34 by joko, Fri Apr 11 01:18:53 2003 UTC revision 1.41 by joko, Sun Jun 29 02:03:45 2003 UTC
# Line 3  Line 3 
3  #  $Id$  #  $Id$
4  #  #
5  #  $Log$  #  $Log$
6    #  Revision 1.41  2003/06/29 02:03:45  joko
7    #  fix:? initialize schema on startup
8    #
9    #  Revision 1.40  2003/06/25 22:57:54  joko
10    #  major rework of "sub sendQuery / sub getListFiltered": now should be capable of "sorting"
11    #
12    #  Revision 1.39  2003/06/06 11:40:40  jonen
13    #  fixed bug at 'getFilteredList'
14    #
15    #  Revision 1.38  2003/05/13 16:38:38  joko
16    #  problems with "tied" on 5.6.1/win32
17    #
18    #  Revision 1.37  2003/05/10 17:37:39  jonen
19    #  corrected last commit
20    #
21    #  Revision 1.36  2003/05/10 17:31:18  jonen
22    #  + added new functions related to 'create' item
23    #   - createNode()
24    #     # creates non-persistent 'deep dummy filled' object
25    #   - insertChildNode()
26    #     # inserts child node at given parent (child node haven't to exists,
27    #         createNode will be injected transparently)
28    #
29    #  Revision 1.35  2003/04/19 16:09:48  jonen
30    #  + added operator dispatching (currently for getting ref-type) at 'getListFiltered'
31    #
32  #  Revision 1.34  2003/04/11 01:18:53  joko  #  Revision 1.34  2003/04/11 01:18:53  joko
33  #  sendQuery:  #  sendQuery:
34  #  + introduced crud action 'DELETE'  #  + introduced crud action 'DELETE'
# Line 167  sub _initSchema { Line 193  sub _initSchema {
193    #if (!$schema_tangram) {    #if (!$schema_tangram) {
194      #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} } );
195      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} } );
196      $schema_tangram = $obj->getSchema();      $schema_tangram = $obj->getSchema() if $obj;
197    #}    #}
198    if (!$schema_tangram) {    if (!$schema_tangram) {
199      $logger->error( __PACKAGE__ . "->_initSchema: No Schema available for $self->{schema}" );      $logger->error( __PACKAGE__ . "->_initSchema: No Schema available for $self->{locator}->{schema}." );
200      return 0;      return 0;
201    }    }
202    #$self->_patchSchema();    #$self->_patchSchema();
# Line 216  sub connect { Line 242  sub connect {
242  #      return;  #      return;
243  #    }  #    }
244    
245      #return unless $self->_initSchema();      return unless $self->_initSchema();
246      $self->_initSchema();      #$self->_initSchema();
247    
248      # create the main tangram storage object      # create the main tangram storage object
249      #$self->{COREHANDLE} = Tangram::Relational->connect( $schema, $dsn );      #$self->{COREHANDLE} = Tangram::Relational->connect( $schema, $dsn );
# Line 479  sub getListFiltered { Line 505  sub getListFiltered {
505    # redirect to unfiltered mode    # redirect to unfiltered mode
506    #return $self->getListUnfiltered(@_);    #return $self->getListUnfiltered(@_);
507    
508    my $nodename = shift;    my $in = {};
509    my $filters = shift;    $in->{nodename} = shift;
510      $in->{filters} = shift;
511      $in->{sorting} = shift;
512      
513    my @results;    my @results;
514    $logger->debug( __PACKAGE__ . "->getListFiltered( nodename => '" . $nodename . "' )" );    $logger->debug( __PACKAGE__ . "->getListFiltered( nodename => '" . $in->{nodename} . "' )" );
515    
516      #print Dumper($filters);
517    
518  #print Dumper($filters);    # 1. "Remote Object Handle" - get set of objects from odbms by object name
519      my $remote = $self->{_COREHANDLE}->remote($in->{nodename});
520        
521      # 2. Transfer $in to $orm_query
522      my $orm_query = {};
523      
524      # 2.a. Filters
525    my @tfilters;    my @tfilters;
526      my $orm_filter = undef;
527        
528    foreach my $filter (@$filters) {    foreach my $filter (@{$in->{filters}}) {
529        
530      # get filter - TODO: for each filter      # get filter - TODO: for each filter
531      #my $filter = $filters->[0];      #my $filter = $filters->[0];
532      
533      # build filter      # 1. The parts of a filter source entry
534      my $lexpr = $filter->{key};      my $lexpr = $filter->{key};
535      #my $op = $filter->{op};      #my $op = $filter->{op};
536      my $op = '=';      my $op = '=';
537      my $rexpr = $filter->{val};      my $rexpr = $filter->{val};
538      my $tight = 100;      my $tight = 100;
539    
540        # 2. Build filter target entry
541            
542    #  my $tfilter = Tangram::Filter->new(      # Test 1 - didn't work out!
543    #    expr => "t1.$lexpr $op '$rexpr'",      #  my $tfilter = Tangram::Filter->new(
544    #    tight => $tight,      #    expr => "t1.$lexpr $op '$rexpr'",
545    #    objects => $objects,      #    tight => $tight,
546    #  );      #    objects => $objects,
547          #  );
548      # HACK: build eval-string (sorry) to get filtered list - please give advice here  
549      push @tfilters, '$remote->{' . $filter->{key} . '}' . " $filter->{op} '$filter->{val}'";      my $orm_filter_tmp = undef;
550        # was:
551        # TODO: is_op?
552        # dispatch un-common operators if exists
553        if ($filter->{op} eq "ref") {
554          # do nothing, results will be filtered later cause 'tangram-filter' doesn't support 'ref' query
555          #print "Filter->op eq 'ref'.\n";
556          #push @tfilters, 'ref($remote->{' . $filter->{key} . '})' . " eq '$filter->{val}'";
557        } else {
558          # HACK: build eval-string (sorry) to get filtered list - please give advice here
559          #push @tfilters, '$remote->{' . $filter->{key} . '}' . " $filter->{op} '$filter->{val}'";
560          # better: calculate expression right here!
561          #push @tfilters, '$remote->{' . $filter->{key} . '}' . " $filter->{op} '$filter->{val}'";
562          
563          #print "key: ", $filter->{key}, "\n";
564          
565          my $left = $remote->{$filter->{key}};
566          #my $r = Tangram::Expr->new( 'string' => "'" . $filter->{val} . "'" );
567          my $right = $filter->{val};
568          my $op = $filter->{op};
569          $orm_filter_tmp = $left->$op($right);
570        }
571    
572        if (not $orm_filter) {
573          $orm_filter = $orm_filter_tmp;
574        } else {
575          $orm_filter = $orm_filter->and($orm_filter_tmp);
576        }
577    
578    }    }
579    
580    my $tfilter = join(' & ', @tfilters);    $orm_query->{filter} = $orm_filter;
581    
   # get set of objects from odbms by object name  
   my $remote = $self->{_COREHANDLE}->remote($nodename);  
     
582    # was:    # was:
583    #@results = $self->{COREHANDLE}->select($object_set, $tfilter);  
584      # 2.b. sorting [new as of 2003-06-17]
585      if ($in->{sorting}) {
586        my $sorting_rules = [];
587        my $sorting_order = 'ASC';
588        foreach my $sorting_column (keys %{$in->{sorting}}) {
589          $sorting_order = $in->{sorting}->{$sorting_column} if $in->{sorting}->{$sorting_column};
590          push @$sorting_rules, Tangram::Expr->new( 'string' => $sorting_column );
591        }
592        $orm_query->{order} = $sorting_rules;
593        if ($sorting_order eq 'DESC') {
594          $orm_query->{desc} = 1;
595        }
596      }
597    
598    
599      # 3. build and issue query - return result as Tangram::Cursor
600      
601      # coerce hash into array (This is valid in Perl)
602      my @orm_query_args = %$orm_query;
603      # send query (arguments) to orm
604      @results = $self->{_COREHANDLE}->select($remote, @orm_query_args);
605      
606      #my $cursor = $self->{_COREHANDLE}->cursor($remote, @orm_query_args);
607      #return $cursor;
608      #print Dumper(@results);
609    
610    # is:    # is:
611    # 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
612    my $evalstring = 'return $self->{_COREHANDLE}->select($remote, ' . $tfilter . ');';      #my $evalstring = 'return $self->{_COREHANDLE}->select($remote, ' . $tfilter . $sorting . ');';
613          #print "eval: $evalstring", "\n";
614    #print "eval: $evalstring", "\n";      # get filtered list/set
615          #@results = eval($evalstring);
616    # get filtered list/set      #die $@ if $@;
617    @results = eval($evalstring);  
618    die $@ if $@;  =pod
619      # filter results
620      if ($filters->[0]->{op} && ($filters->[0]->{op} eq "ref")) {
621          #print "Filter->op eq 'ref'.\n";
622          my $att_name = $filters->[0]->{key};
623          my $att_val = $filters->[0]->{val};
624          my @filtered;
625          foreach(@results) {
626            if(ref($_->{$att_name}) eq $att_val) {
627              push @filtered, $_;
628            }
629          }
630          @results = @filtered;
631      }
632    =cut
633    
634      #print "results: " . Dumper(\@results);
635        
636    return \@results;    return \@results;
637  }  }
# Line 557  sub createSet { Line 661  sub createSet {
661    return $result;    return $result;
662  }  }
663    
664    sub createResult {
665      my $self = shift;
666      my $rh = shift;
667      my $result = Data::Storage::Result::Tangram->new( RESULTHANDLE => $rh );
668      return $result;
669    }
670    
671  sub sendQuery {  sub sendQuery {
672    my $self = shift;    my $self = shift;
673    my $query = shift;    my $query = shift;
# Line 590  sub sendQuery { Line 701  sub sendQuery {
701            
702      } elsif (my $guid = $query->{options}->{GUID}) {      } elsif (my $guid = $query->{options}->{GUID}) {
703        $type = 'TRANSPARENT';        $type = 'TRANSPARENT';
704        $query->{criterias} = [ { key => 'guid', op => 'eq', val => $guid } ];        $query->{criterias} = [ { key => 'guid', op => 'eq', val => $guid } ];    
705        
706        # if operator is different (dispatcher for 'getListFiltered')
707        } elsif (my $op = $query->{options}->{op}) {
708          $type = 'TRANSPARENT';
709          $query->{criterias} = [ { key => $query->{options}->{meta_label}, op => $op, val => $query->{options}->{meta_value} } ];    
710    
711      }      }
712        
713      # HACK: special case: querying by id does not translate into a common tangram query      # HACK: special case: querying by id does not translate into a common tangram query
# Line 643  sub sendQuery { Line 759  sub sendQuery {
759    
760      if ($crud eq 'RETRIEVE') {      if ($crud eq 'RETRIEVE') {
761    
762        my $list = $self->getListFiltered($query->{node}, $query->{criterias});        my $list = $self->getListFiltered($query->{node}, $query->{criterias}, $query->{sorting});
763          #return $list;
764          return $self->createResult($list);
765          
766        #return $self->createSet($object);        #return $self->createSet($object);
767        #return $self->createSet($list);        #return $self->createSet($list);
768        return $self->createSet(@$list);        return $self->createSet(@$list);
# Line 700  sub sendQuery { Line 819  sub sendQuery {
819    
820        $self->erase($object);        $self->erase($object);
821    
822        } elsif ($crud eq 'CREATE') {
823          
824          my $nodename = $query->{node};      
825          my $newnode = $self->createNode($nodename);
826          my $id = $self->{_COREHANDLE}->insert($newnode);
827      
828          print "Saved new node $nodename with GUID $newnode->{guid}, OID '$id': " . Dumper($newnode) . "\n";
829          
830          return $newnode;
831    
832      }      }
833    
834    }    }
# Line 854  sub disconnect2 { Line 983  sub disconnect2 {
983    $self->{dataStorageLayer}->disconnect();    $self->{dataStorageLayer}->disconnect();
984  }  }
985    
986    
987    sub createNode {
988      my $self = shift;
989      my $classname = shift;
990    
991      my $obj = $classname->new();
992      
993      my $attr_options = Class::Tangram::attribute_options($classname);
994      #print "Attribute Options: " . Dumper($attr_options);
995    
996      my $attr_types = Class::Tangram::attribute_types($classname);
997      #print "Attribute Types: " . Dumper($attr_types);
998      
999      foreach(keys %{$attr_types}) {
1000        if($attr_types->{$_} eq 'string') {
1001          $obj->{$_} = '';
1002        } elsif($attr_types->{$_} eq 'int') {
1003          $obj->{$_} = 0;
1004        } elsif($attr_types->{$_} eq 'real') {
1005          $obj->{$_} = 0;
1006        } elsif($attr_types->{$_} eq 'rawdatetime') {
1007          $obj->{$_} = '0000-00-00 00:00:00';
1008        } elsif($attr_types->{$_} eq 'ref') {
1009          if($attr_options->{$_}->{class}) {
1010            $obj->{$_} = $self->createNode($attr_options->{$_}->{class});
1011          } else {
1012            #$obj->{$_} = undef();
1013          }
1014        } elsif($attr_types->{$_} eq 'iarray') {
1015            $obj->{$_} = [ ];
1016        } elsif($attr_types->{$_} eq 'hash') {
1017            $obj->{$_} = {  };
1018        } elsif($attr_types->{$_} eq 'flat_hash') {
1019            $obj->{$_} = { };
1020        }
1021      }
1022      
1023      #print "New Object: " . Dumper($obj);
1024      
1025      return $obj;
1026    }
1027    
1028    
1029      sub insertChildNode {
1030        my $self = shift;
1031        my $child_entry = shift;
1032        my $query_args = shift;
1033        
1034        my $core = $self->{_COREHANDLE};
1035        my $nodename = $query_args->{nodename};
1036        
1037        # get parent object
1038        my $query = {
1039              node => $query_args->{parent}->{nodename},
1040              options => { GUID => $query_args->{parent}->{guid}, },
1041              };
1042        my $cursor = $self->sendQuery($query);
1043        my $parent = $cursor->getNextEntry();
1044    
1045        # debug
1046        #print "Parent_org: " . Dumper($parent);
1047            
1048        # Create child node object if isn't already done
1049        # ($child_entry have to be the class name then...)
1050        if(!ref($child_entry)) {
1051          $child_entry = $self->createNode($child_entry);
1052          # it could be insert 'manually' or will be insert 'transparent' if parent will be updated
1053          #$core->insert($child_entry);
1054          #print "Create child object [$nodename]: " . Dumper($child_entry);
1055        }
1056    
1057        # get reference of tied node (seems, only on Linux node's are tied!!)
1058        my $tied_node = tied $parent->{$nodename};
1059    
1060        # insert/change child entry at parent
1061        #print "reference: " . ref($parent->{$nodename}) . "\n";
1062        if(ref($parent->{$nodename}) eq 'ARRAY') {
1063          # (seems, only on Linux node's are tied!!)
1064          if($tied_node) {
1065            # all tangram types are tied as 'SCALAR' with special 'FETCH', 'STORE' methods per type,
1066            # so a 'PUSH' is not implemented (which could be then done transparently)
1067            my $array = $tied_node->FETCH;
1068            push @$array, $child_entry;
1069            $tied_node->STORE($array);
1070            # node will be normaly untied at 'STORE'
1071            if(tied $parent->{$nodename}) { print "already tied !!\n"; }
1072            else { undef $tied_node; }
1073          } else {
1074            push @{$parent->{$nodename}}, $child_entry;
1075          }
1076        }
1077        elsif(ref($parent->{$nodename}) eq 'HASH') {
1078          if(my $key = $query_args->{hash_key}) {
1079            # (seems, only on Linux node's are tied!!)
1080            if($tied_node) {
1081              # same problem as with 'ARRAY':
1082              # all tangram types are tied as 'SCALAR' with special 'FETCH', 'STORE' methods per type.
1083              my $hash = $tied_node->FETCH;
1084              $hash->{$key} = $child_entry;
1085              $tied_node->STORE($hash);
1086              # node will be normaly untied at 'STORE'
1087              if(tied $parent->{$nodename}) { print "already tied !!\n"; }
1088              else { undef $tied_node; }
1089            } else {
1090              $parent->{$nodename}->{$key} = $child_entry;
1091            }
1092          } else {
1093           print "ERROR: No HASH KEY given, so not able to insert hash entry!";
1094          }
1095        }
1096        else {
1097          $parent->{$nodename} = $child_entry;
1098        }
1099    
1100        # debug
1101        #print "Parent_new: " . Dumper($parent);
1102        
1103        # save parent
1104        $core->update($parent);
1105        
1106        # debug
1107        #print "Saved Parent: ". Dumper($parent);
1108        
1109        return $child_entry;
1110      }
1111    
1112    
1113  1;  1;
1114  __END__  __END__
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