/[cvs]/nfo/perl/libs/Data/Storage/Handler/Tangram.pm
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revision 1.4 by joko, Fri Oct 25 11:44:44 2002 UTC revision 1.22 by jonen, Wed Dec 18 22:28:16 2002 UTC
# Line 1  Line 1 
1  #################################  ############################################
2  #  #
3  #  $Id$  #  $Id$
4  #  #
5  #  $Log$  #  $Log$
6    #  Revision 1.22  2002/12/18 22:28:16  jonen
7    #  + added extended logging at 'getObjectByGuid()'
8    #
9    #  Revision 1.21  2002/12/16 22:20:49  jonen
10    #  + fixed bug at 'getObjectByGuid()'
11    #
12    #  Revision 1.20  2002/12/16 20:49:17  jonen
13    #  + added sub 'getObjectByGuid()'
14    #  + added functionality to use 'getObjectByGuid' at 'getObjectAsHash()'
15    #
16    #  Revision 1.19  2002/12/16 06:46:09  joko
17    #  + attempt to introduce a generic '_patchSchema' - cancelled!
18    #
19    #  Revision 1.18  2002/12/13 21:48:07  joko
20    #  + fix to 'sub sendQuery'
21    #
22    #  Revision 1.17  2002/12/12 02:51:09  joko
23    #  + cosmetics
24    #
25    #  Revision 1.16  2002/12/11 06:54:10  joko
26    #  + fix: encapsulated object-loading inside an 'eval'
27    #
28    #  Revision 1.15  2002/12/05 13:55:21  joko
29    #  + now utilizing 'object2hash' instead of 'var_deref'
30    #  + played around with having fresh-objects - no progress....
31    #
32    #  Revision 1.14  2002/12/05 09:40:30  jonen
33    #  + added option->{destroy} at getObject for unloading all instance
34    #
35    #  Revision 1.13  2002/12/05 07:59:04  joko
36    #  + now using Tie::SecureHash as a base for the COREHANDLE
37    #  + former public COREHANDLE becomes private _COREHANDLE now
38    #  + sub getCOREHANDLE
39    #
40    #  Revision 1.12  2002/12/04 11:34:49  joko
41    #  - $schema_tangram doesn't have to be in class?
42    #
43    #  Revision 1.11  2002/12/04 08:54:08  jonen
44    #  + untested bugfix: undef($object) after transform to hash at getObjectAsHash
45    #
46    #  Revision 1.10  2002/12/03 15:53:23  joko
47    #  + small bugfix regarding object hierarchy
48    #
49    #  Revision 1.9  2002/12/03 05:29:40  joko
50    #  + sub getObject
51    #  + sub getObjectAsHash
52    #
53    #  Revision 1.8  2002/12/01 22:25:51  joko
54    #  + now utilizing metadata from storage locator when connecting to DBI in "raw"-mode
55    #
56    #  Revision 1.7  2002/12/01 04:46:19  joko
57    #  + sub eraseAll
58    #
59    #  Revision 1.6  2002/11/29 05:02:30  joko
60    #  - sub getNewPerlObjectByPkgName (moved to libp.pm)
61    #  + sub getMetaInfo
62    #  - sub existsChildNode (moved to Abstract.pm)
63    #  + sub getListUnfiltered
64    #  + sub getListFiltered
65    #  + sub createCursor
66    #  + sub createSet
67    #  + sub sendQuery
68    #
69    #  Revision 1.5  2002/11/17 06:35:18  joko
70    #  + locator metadata can now be reached via ->{locator}
71    #  - getChildNodes is now wrapped via COREHANDLE
72    #
73  #  Revision 1.4  2002/10/25 11:44:44  joko  #  Revision 1.4  2002/10/25 11:44:44  joko
74  #  + sub _initSchema  #  + sub _initSchema
75  #  + sub existsChildNode  #  + sub existsChildNode
# Line 21  Line 88 
88  #  Revision 1.1  2002/10/10 03:44:07  cvsjoko  #  Revision 1.1  2002/10/10 03:44:07  cvsjoko
89  #  + new  #  + new
90  #  #
91  #  ############################################
92  #################################  
93    
94  package Data::Storage::Handler::Tangram;  package Data::Storage::Handler::Tangram;
95    
96  use strict;  use strict;
97  use warnings;  use warnings;
98    
99    use base ("Data::Storage::Handler");
100  use base ("Data::Storage::Handler::Abstract");  use base ("Data::Storage::Handler::Abstract");
101    
102  use Tangram;  use Tangram;
103  use Data::Dumper;  use Data::Dumper;
104    use libp qw( getNewPerlObjectByPkgName );
105    use Data::Storage::Result::Tangram;
106    use Data::Compare::Struct qw( isEmpty );
107    use Data::Transform::Deep qw( object2hash );
108    use Data::Transform::Encode qw( var2utf8 );
109    
110    
111  # get logger instance  # get logger instance
112  my $logger = Log::Dispatch::Config->instance;  my $logger = Log::Dispatch::Config->instance;
113    
114    
115  our $metainfo = {  # this holds the complete instantiated schema from tangram
116    'disconnectMethod' => 'disconnect',  my $schema_tangram;
 };  
117    
118  sub getNewPerlObjectByPkgName {  sub getMetaInfo {
119    my $pkgname = shift;    my $self = shift;
120    my $args = shift;    $logger->debug( __PACKAGE__ . "->getMetaInfo()"  );
121    $logger->debug( __PACKAGE__ . "->getNewPerlObjectByPkgName( pkgname $pkgname args $args )" );    return {
122    my $evstring = "use $pkgname;";      'disconnectMethod' => 'disconnect',
123    eval($evstring);    };
   $@ && $logger->error( __PACKAGE__ . ':' . __LINE__ . " Error in eval: " .  $@ );  
   return $pkgname->new($args);  
124  }  }
125    
126  sub _initSchema {  sub _initSchema {
127    my $self = shift;    my $self = shift;
128    $logger->debug( __PACKAGE__ . "->_initSchema()" );    $logger->debug( __PACKAGE__ . "->_initSchema()" );
129    #if (!$self->{schema_tangram}) {    #if (!$schema_tangram) {
130      my $obj = getNewPerlObjectByPkgName($self->{schema}, { EXPORT_OBJECTS => $self->{classnames} } );      my $obj = getNewPerlObjectByPkgName($self->{locator}->{schema}, { EXPORT_OBJECTS => $self->{locator}->{classnames}, want_transactions => $self->{locator}->{want_transactions} } );
131      $self->{schema_tangram} = $obj->getSchema();      $schema_tangram = $obj->getSchema();
132    #}    #}
133    if (!$self->{schema_tangram}) {    if (!$schema_tangram) {
134      $logger->error( __PACKAGE__ . "->_initSchema: No Schema available for $self->{schema}" );      $logger->error( __PACKAGE__ . "->_initSchema: No Schema available for $self->{schema}" );
135      return 0;      return 0;
136    }    }
137      #$self->_patchSchema();
138    return 1;    return 1;
139  }  }
140    
141    sub _patchSchema {
142      my $self = shift;
143      foreach (keys %{$schema_tangram->{classes}}) {
144        next if $schema_tangram->{classes}->{$_}->{abstract};
145        #next if ($_ ne 'TsBankAccount');
146        #$_ ne 'AbstractAccount' &&
147        print "class: $_", "\n";
148    #print Dumper($schema_tangram->{classes}->{$_});
149        # create new string property named 'guid'
150        my $tstring = Tangram::String->new();
151        $tstring->{name} = $tstring->{col} = 'guid';
152        # inject property into schema
153        #$schema_tangram->{classes}->{$_}->{root}->{SPECS}->[0]->{fields}->{string}->{$tstring->{name}} = $tstring;
154        print Dumper($schema_tangram->{classes}->{$_}->{root}->{SPECS}->[0]->{fields});
155      }
156    }
157    
158  sub connect {  sub connect {
159    
160      my $self = shift;      my $self = shift;
161            
162      my $dsn = shift;      my $dsn = shift;
163      $dsn ||= $self->{dbi}->{dsn};      $dsn ||= $self->{locator}->{dbi}->{dsn};
164            
165      $logger->debug( __PACKAGE__ . "->connect( dsn $dsn )" );      $logger->debug( __PACKAGE__ . "->connect( dsn $dsn )" );
166            
# Line 86  sub connect { Line 175  sub connect {
175    
176      return unless $self->_initSchema();      return unless $self->_initSchema();
177    
178        # create the main tangram storage object
179      #$self->{COREHANDLE} = Tangram::Relational->connect( $schema, $dsn );      #$self->{COREHANDLE} = Tangram::Relational->connect( $schema, $dsn );
180      $self->{COREHANDLE} = Tangram::Relational->connect( $self->{schema_tangram}, $dsn );      $self->{_COREHANDLE} = Tangram::Relational->connect( $schema_tangram, $dsn );
181    
182    #print "connect", "\n";
183    #my $core = $self->{_COREHANDLE};
184    #print Dumper($core);
185        
186        # some attempts for configuring the wrapped underlying dbi.....
187      #$self->{STORAGEHANDLE_UNDERLYING} = $self->getUnderlyingStorage();      #$self->{STORAGEHANDLE_UNDERLYING} = $self->getUnderlyingStorage();
188      #$self->{STORAGEHANDLE_UNDERLYING}->_configureCOREHANDLE();      #$self->{STORAGEHANDLE_UNDERLYING}->_configureCOREHANDLE();
189      #$self->_configureUnderlyingStorage;      #$self->_configureUnderlyingStorage;
190        
191        # ..... encapsulation wins!
192      $self->configureCOREHANDLE();      $self->configureCOREHANDLE();
193    
194      $self->{locator}->{status}->{connected} = 1;
195    
196    return 1;    return 1;
197    
198  }  }
# Line 108  sub getChildNodes { Line 207  sub getChildNodes {
207    # create new DBI - Data::Storage - object from already connected DBI::db - handle inside the current COREHANDLE    # create new DBI - Data::Storage - object from already connected DBI::db - handle inside the current COREHANDLE
208    #my $loc = new Data::Storage::Locator( type => "DBI", dbi => { db => $self->{COREHANDLE}->{db} });    #my $loc = new Data::Storage::Locator( type => "DBI", dbi => { db => $self->{COREHANDLE}->{db} });
209    #my $loc = new Data::Storage::Locator( type => "DBI", COREHANDLE => $self->{COREHANDLE}->{db} );    #my $loc = new Data::Storage::Locator( type => "DBI", COREHANDLE => $self->{COREHANDLE}->{db} );
210      
211      # todo: should we retrieve information from the schema here
212      # rather than poorly getting table names from underlying dbi?
213    my $storage = $self->_getSubLayerHandle();    my $storage = $self->_getSubLayerHandle();
214      @nodes = @{$storage->getChildNodes()};
215    #$storage->_configureCOREHANDLE();    #$storage->_configureCOREHANDLE();
216    #print "getchildnodes\n";
217    #print Dumper($self);
218    #if (my $result = $self->sendCommand( 'SHOW TABLES;' ) ) {    #if (my $result = $self->sendCommand( 'SHOW TABLES;' ) ) {
   if (my $result = $storage->sendCommand( 'SHOW TABLES;' ) ) {  
     while ( my $row = $result->_getNextEntry() ) {  
       push @nodes, $row;  
     }  
   }  
219        
220    $storage->disconnect();    # TODO: REVIEW
221      #$storage->disconnect();
222        
223    $self->{meta}->{childnodes} = \@nodes;    $self->{meta}->{childnodes} = \@nodes;
224        
# Line 127  sub getChildNodes { Line 227  sub getChildNodes {
227  }  }
228    
229    
 sub existsChildNode {  
   my $self = shift;  
   my $nodename = shift;  
   $logger->debug( __PACKAGE__ . "->getChildNode( nodename $nodename )" );  
   $self->getChildNodes() unless $self->{meta}->{childnodes};  
   return grep $nodename, @{$self->{meta}->{childnodes}};  
 }  
   
   
230  sub testIntegrity {  sub testIntegrity {
231    
232    my $self = shift;    my $self = shift;
# Line 154  sub testIntegrity { Line 245  sub testIntegrity {
245      return;      return;
246    }    }
247    
248      $self->{locator}->{status}->{integrity} = 1;
249    return 1;    return 1;
250    
251  }  }
# Line 165  sub _getSubLayerHandle { Line 257  sub _getSubLayerHandle {
257        
258    $logger->debug( __PACKAGE__ . "->_getSubLayerHandle()" );    $logger->debug( __PACKAGE__ . "->_getSubLayerHandle()" );
259    
   use Data::Dumper;  
260    #print Dumper($self);    #print Dumper($self);
261    #exit;  
     
262    # hack, make more generic!    # hack, make more generic!
263    if (!$self->{dataStorageLayer}) {    if (!$self->{dataStorageLayer}) {
264      $logger->debug( __PACKAGE__ . "->_getSubLayerHandle() creating new dataStorageLayer" );      $logger->debug( __PACKAGE__ . "->_getSubLayerHandle() creating new dataStorageLayer" );
265      #my $loc = Data::Storage::Locator->new( type => "DBI", dbi => $self->{dbi}, COREHANDLE => $self->{COREHANDLE}->{db} );      #my $loc = Data::Storage::Locator->new( type => "DBI", dbi => $self->{dbi}, COREHANDLE => $self->{COREHANDLE}->{db} );
266      my $loc = Data::Storage::Locator->new( type => "DBI", dbi => $self->{dbi} );      my $loc = Data::Storage::Locator->new( { type => "DBI", dbi => $self->{locator}->{dbi} } );
267      $self->{dataStorageLayer} = Data::Storage->new( $loc, { protected => 1 } );      $self->{dataStorageLayer} = Data::Storage->new( $loc, { protected => 1 } );
268      #$self->{STORAGE_UNDER_THE_HOOD}->{STORAGEHANDLE}->_configureCOREHANDLE();      #$self->{STORAGE_UNDER_THE_HOOD}->{STORAGEHANDLE}->_configureCOREHANDLE();
269      #$self->{STORAGE_UNDER_THE_HOOD}->_configureCOREHANDLE();      #$self->{STORAGE_UNDER_THE_HOOD}->_configureCOREHANDLE();
# Line 197  sub _configureUnderlyingStorage { Line 287  sub _configureUnderlyingStorage {
287    foreach my $key (keys %{$self->{dbi}}) {    foreach my $key (keys %{$self->{dbi}}) {
288      my $val = $self->{dbi}->{$key};      my $val = $self->{dbi}->{$key};
289      print "entry: $key; $val", "\n";      print "entry: $key; $val", "\n";
290      $self->{COREHANDLE}->{db}->{$key} = $val;      $self->{_COREHANDLE}->{db}->{$key} = $val;
291    }    }
292    #print Dumper($self->{COREHANDLE}->{db});    #print Dumper($self->{COREHANDLE}->{db});
293  }  }
# Line 213  sub configureCOREHANDLE { Line 303  sub configureCOREHANDLE {
303    
304    # apply configured modifications    # apply configured modifications
305      if (exists $self->{dbi}->{trace_level} && exists $self->{dbi}->{trace_file}) {      if (exists $self->{dbi}->{trace_level} && exists $self->{dbi}->{trace_file}) {
306        $self->{COREHANDLE}->{db}->trace($self->{dbi}->{trace_level}, $self->{dbi}->{trace_file});        $self->{_COREHANDLE}->{db}->trace($self->{dbi}->{trace_level}, $self->{dbi}->{trace_file});
307      }      }
308      if (exists $self->{dbi}->{RaiseError}) {      if (exists $self->{dbi}->{RaiseError}) {
309        $self->{COREHANDLE}->{db}->{RaiseError} = $self->{dbi}->{RaiseError};        $self->{_COREHANDLE}->{db}->{RaiseError} = $self->{dbi}->{RaiseError};
310      }      }
311      if (exists $self->{dbi}->{PrintError}) {      if (exists $self->{dbi}->{PrintError}) {
312        $self->{COREHANDLE}->{db}->{PrintError} = $self->{dbi}->{PrintError};        $self->{_COREHANDLE}->{db}->{PrintError} = $self->{dbi}->{PrintError};
313      }      }
314      if (exists $self->{dbi}->{HandleError}) {      if (exists $self->{dbi}->{HandleError}) {
315        $self->{COREHANDLE}->{db}->{HandleError} = $self->{dbi}->{HandleError};        $self->{_COREHANDLE}->{db}->{HandleError} = $self->{dbi}->{HandleError};
316      }      }
317    
318  }  }
319    
320  sub deploySchema {  sub deploySchema {
321    my $self = shift;    my $self = shift;
322    #my $dsn = $self->{locator}->{dbi}->{dsn};    my $args = shift;
323    my $dsn = $self->{dbi}->{dsn};    
324      my $dsn = $self->{locator}->{dbi}->{dsn};
325    
326    $logger->debug( __PACKAGE__ . "->deploySchema( dsn $dsn )" );    $logger->debug( __PACKAGE__ . "->deploySchema( dsn $dsn )" );
327    
328    my $ok;    my $ok;
329    if ( my $dbh = DBI->connect($dsn, '', '', {    if ( my $dbh = DBI->connect($dsn, '', '', $self->{locator}->{dbi} ) ) {
                                                       PrintError => 0,  
                                                     } ) ) {  
   
330      return unless $self->_initSchema();      return unless $self->_initSchema();
331            $ok = Tangram::Relational->deploy($schema_tangram, $dbh );
     $ok = Tangram::Relational->deploy($self->{schema_tangram}, $dbh );  
332      $dbh->disconnect();      $dbh->disconnect();
333    }    }
334    return $ok;    return $ok;
# Line 250  sub deploySchema { Line 337  sub deploySchema {
337  sub retreatSchema {  sub retreatSchema {
338    
339    my $self = shift;    my $self = shift;
340    #my $dsn = $self->{locator}->{dbi}->{dsn};    my $dsn = $self->{locator}->{dbi}->{dsn};
   my $dsn = $self->{dbi}->{dsn};  
341    
342    $logger->debug( __PACKAGE__ . "->retreatSchema( dsn $dsn )" );    $logger->debug( __PACKAGE__ . "->retreatSchema( dsn $dsn )" );
343    
344    my $ok;    my $ok;
345    if ( my $dbh = DBI->connect($dsn, '', '', {    if ( my $dbh = DBI->connect($dsn, '', '', $self->{locator}->{dbi} ) ) {
                                                       #PrintError => 0,  
                                                       #RaiseError => 0,  
                                                     } ) ) {  
346    
347      return unless $self->_initSchema();      return unless $self->_initSchema();
348            
349      #use Data::Dumper; print Dumper($self);      #use Data::Dumper; print Dumper($self);
350      $self->{dataStorageLayer}->removeLogDispatchHandler("Tangram11");      $self->{dataStorageLayer}->removeLogDispatchHandler("Tangram11");
351            
352      $ok = Tangram::Relational->retreat($self->{schema_tangram}, $dbh );      $ok = Tangram::Relational->retreat($schema_tangram, $dbh );
353      $ok = 2;    # answer is "maybe" for now since Tangram::Relational->retreat doesn't seem to return a valid status  
354                      # idea: test this by checking for count of tables in database -      # answer "$ok=2" means "maybe" for now - we have to patch this to a constant here because...
355                      #          problem with this: there may be some left not having been included to the schema      # - ... Tangram::Relational->retreat doesn't seem to return a valid status
356        # - possible improvement:
357        #   - test this by checking for count of tables in database
358        #   - problem with this: there may be some left not having been included to the schema
359        #   - maybe better: use "->getChildNodes"?
360        $ok = 2;
361    
362      $dbh->disconnect();      $dbh->disconnect();
363    
364    }    }
365    return $ok;    return $ok;
366  }  }
# Line 295  sub rebuildDbAndSchema { Line 385  sub rebuildDbAndSchema {
385    return $res;    return $res;
386  }  }
387    
388    sub getListUnfiltered {
389      my $self = shift;
390      my $nodename = shift;
391      my @results;
392      $logger->debug( __PACKAGE__ . "->getListUnfiltered( nodename => '" . $nodename . "' )" );
393      # get set of objects from odbms by object name
394      my $object_set = $self->{_COREHANDLE}->remote($nodename);
395      @results = $self->{_COREHANDLE}->select($object_set);
396      return \@results;
397    }
398    
399    sub getListFiltered {
400      my $self = shift;
401    
402      # redirect to unfiltered mode
403      #return $self->getListUnfiltered(@_);
404    
405      my $nodename = shift;
406      my $filters = shift;
407      my @results;
408      $logger->debug( __PACKAGE__ . "->getListFiltered( nodename => '" . $nodename . "' )" );
409    
410      #print Dumper($filters);
411      
412      my @tfilters;
413      
414      foreach my $filter (@$filters) {
415      
416        # get filter - TODO: for each filter
417        #my $filter = $filters->[0];
418      
419        # build filter
420        my $lexpr = $filter->{key};
421        #my $op = $filter->{op};
422        my $op = '=';
423        my $rexpr = $filter->{val};
424        my $tight = 100;
425        
426      #  my $tfilter = Tangram::Filter->new(
427      #    expr => "t1.$lexpr $op '$rexpr'",
428      #    tight => $tight,
429      #    objects => $objects,
430      #  );
431      
432        # HACK: build eval-string (sorry) to get filtered list - please give advice here
433        push @tfilters, '$remote->{' . $filter->{key} . '}' . " $filter->{op} '$filter->{val}'";
434    
435      }
436    
437      my $tfilter = join(' & ', @tfilters);
438    
439      # get set of objects from odbms by object name
440      my $remote = $self->{_COREHANDLE}->remote($nodename);
441      
442      # was:
443      #@results = $self->{COREHANDLE}->select($object_set, $tfilter);
444    
445      # is:
446      # HACK: build eval-string (sorry) to get filtered list - please give advice here
447      my $evalstring = 'return $self->{_COREHANDLE}->select($remote, ' . $tfilter . ');';
448      
449      # get filtered list/set
450      @results = eval($evalstring);
451      die $@ if $@;
452      
453      return \@results;
454    }
455    
456    sub createCursor {
457      my $self = shift;
458      my $node = shift;
459      my $cmdHandle = $self->{_COREHANDLE}->cursor($node);
460      my $result = Data::Storage::Result::Tangram->new( RESULTHANDLE => $cmdHandle );
461      return $result;
462    }
463    
464    sub createSet {
465      my $self = shift;
466    #print "-" x 80, "\n";
467    #print Dumper(@_);
468      my @objects = @_;
469      my $rh = Set::Object->new();
470      foreach (@objects) {
471        if (!isEmpty($_)) {
472    #print Dumper($_);
473          $rh->insert($_);
474        }
475      }
476      #print Dumper($rh->members());
477      my $result = Data::Storage::Result::Tangram->new( RESULTHANDLE => $rh );
478      return $result;
479    }
480    
481    sub sendQuery {
482      my $self = shift;
483      my $query = shift;
484      #my $sql = "SELECT cs FROM $self->{metainfo}->{$descent}->{node} WHERE $self->{metainfo}->{$descent}->{IdentProvider}->{arg}='$self->{entry}->{source}->{ident}';";
485      #my $result = $self->{metainfo}->{$descent}->{storage}->sendCommand($sql);
486    
487      #print Dumper($query);
488    
489      # HACK: special case: querying by id does not translate into a common tangram query
490      # just load the object by given id(ent)
491      if ($query->{criterias}->[0]->{key} eq 'id' && $query->{criterias}->[0]->{op} eq 'eq') {
492        #print "LOAD!!!", "\n";
493        #exit;
494        #return Set::Object->new( $self->{COREHANDLE}->load($query->{criterias}->[0]->{val}) );
495        my $ident = $query->{criterias}->[0]->{val};
496    #print "load obj", "\n";
497        #return $self->createSet() if $ident == 5;
498        $self->{_COREHANDLE}->unload($ident);
499        my $object = $self->{_COREHANDLE}->load($ident);
500    #print "get id", "\n";
501        my $oid = $self->{_COREHANDLE}->id($object);
502    #print Dumper($object);
503    #print "oid: $oid", "\n";
504        return $self->createSet($object);
505        #return $self->createSet( $self->{COREHANDLE}->load('300090018') );
506      }
507    
508      die("This should not be reached for now - redirect to \$self->getListFiltered() here!");
509    
510      # TODO: do a common tangram query here
511    
512      my @crits;
513      foreach (@{$query->{criterias}}) {
514        my $op = '';
515        $op = '=' if lc $_->{op} eq 'eq';
516        push @crits, "$_->{key}$op'$_->{val}'";
517      }
518      my $subnodes = {};
519      map { $subnodes->{$_}++ } @{$query->{subnodes}};
520      # HACK: this is hardcoded ;(    expand possibilities!
521      #my $crit = join(' AND ', @crits);
522      #my $sql = hash2Sql($query->{node}, $subnodes, 'SELECT', $crit);
523      #return $self->sendCommand($sql);
524      #my $h = $self->{COREHANDLE}->remote($query->{node});
525      #my $res = $self->{COREHANDLE}->select($h, $h->{);
526      return $self->createCursor($query->{node});
527    }
528    
529    sub eraseAll {
530      my $self = shift;
531      my $classname = shift;
532      my $remote = $self->{_COREHANDLE}->remote($classname);
533      my @objs = $self->{_COREHANDLE}->select($remote);
534      $self->{_COREHANDLE}->erase(@objs);
535    }
536    
537    sub createDb {
538      my $self = shift;
539      my $storage = $self->_getSubLayerHandle();
540      return $storage->createDb();
541    }
542    
543    sub getObject {
544      my $self = shift;
545      my $oid = shift;
546      my $options = shift;
547    
548      # TODO: create a deep_unload method (currently _all_ objects are unloaded)
549      # unload($oid) will only unload object, not deep object hashes
550      $self->{_COREHANDLE}->unload() if ($options->{destroy});
551    
552      # TODO: review this
553      #if (!$self->{COREHANDLE}) { return; }
554    
555      # TODO: review this
556      my $object = eval('$self->{_COREHANDLE}->load($oid);');
557      print $@, "\n" if $@;
558    
559      return $object if $object;
560    }
561    
562    sub getObjectByGuid {
563      my $self = shift;
564      my $guid = shift;
565      my $options = shift;
566      
567      # Guid and Classname is needed
568      if(!$guid || !$options->{classname}) {
569       $logger->error( __PACKAGE__ . "->getObjectByGuid: No 'guid' OR no Classname in options hash was given but needed!" );
570        return;
571      }
572      
573      # TODO: create a deep_unload method (currently _all_ objects are unloaded)
574      # unload($oid) will only unload object, not deep object hashes
575      $self->{_COREHANDLE}->unload() if ($options->{destroy});
576    
577      # search for object with given Classname and Guid
578      my $obj_tmp = $self->{_COREHANDLE}->remote($options->{classname});
579      my @result = $self->{_COREHANDLE}->select($obj_tmp, $obj_tmp->{guid} eq $guid);
580      
581      # we searched for global unique identifer of some object,
582      # so I think we can trust there would be only one result
583      if($result[0]) {
584        return $result[0];
585      } else {
586        $logger->error( __PACKAGE__ . "->getObjectByGuid: No Object with Classname $options->{classname} and GUID $guid found!" );
587        return;
588      }
589      
590    }
591    
592    sub getObjectAsHash {
593      my $self = shift;
594      my $oid = shift;
595      my $options = shift;  
596      my $obj;
597      
598      if($options->{guid}) {
599        $obj = $self->getObjectByGuid($oid, $options);
600      } else {
601        $obj = $self->getObject($oid, $options);
602      }
603      
604      # build options (a callback to unload autovivified objects) for 'expand'
605      # TODO: use $logger to write to debug here!
606      my $cb; # = sub {};
607    =pod
608      if ($options->{destroy}) {
609        $options->{cb}->{destroy} = sub {
610          print "================ DESTROY", "\n";
611          my $object = shift;
612          #print Dumper($object);
613          $self->{_COREHANDLE}->unload($object);
614          #undef($object);
615        };
616      }
617    =cut
618    
619      my $hash = object2hash($obj, $options);
620      #$options->{cb}->{destroy}->($obj);
621      #$self->{_COREHANDLE}->unload($obj);
622      
623      # convert values in hash to utf8 to be ready for (e.g.) encapsulation in XML
624      # now done in object2hash
625      #var2utf8($hash) if ($options->{utf8});
626      
627      # old (wrong) attempts to get rid of used instances, if requested
628        #$obj->clear_refs;
629        #$self->{COREHANDLE}->unload($obj) if($options->{destroy});
630        #$obj->DESTROY;
631        #undef($obj) if($options->{destroy});
632      
633      return $hash;
634    }
635    
636    sub getSchema {
637      return $schema_tangram;
638    }
639    
640    sub getCOREHANDLE {
641      my $self = shift;
642      return $self->{_COREHANDLE};
643    }
644    
645  1;  1;
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