Storage/Handler/Tangram.pm

############################################
#
#  $Id: Tangram.pm,v 1.5 2002/11/17 06:35:18 joko Exp $
#
#  $Log: Tangram.pm,v $
#  Revision 1.5  2002/11/17 06:35:18  joko
#  + locator metadata can now be reached via ->{locator}
#  - getChildNodes is now wrapped via COREHANDLE
#
#  Revision 1.4  2002/10/25 11:44:44  joko
#  + sub _initSchema
#  + sub existsChildNode
#  + sub testIntegrity
#  + sub rebuildDbAndSchema
#
#  Revision 1.3  2002/10/17 03:56:55  joko
#  + bugfix: trapped eval error
#
#  Revision 1.2  2002/10/17 00:10:05  joko
#  + removed dependency from tsobj.pm, schema is now independent
#  + sub getNewPerlObjectByPkgName
#  + sub deploySchema
#  + sub retreatSchema
#
#  Revision 1.1  2002/10/10 03:44:07  cvsjoko
#  + new
#
############################################


package Data::Storage::Handler::Tangram;

use strict;
use warnings;

use base ("Data::Storage::Handler::Abstract");

use Tangram;
use Data::Dumper;
use libp qw( getNewPerlObjectByPkgName );
use Data::Storage::Result::Tangram;
use Data::Compare::Struct qw( isEmpty );

# get logger instance
my $logger = Log::Dispatch::Config->instance;


sub getMetaInfo {
  my $self = shift;
  $logger->debug( __PACKAGE__ . "->getMetaInfo()"  );
  return {
    'disconnectMethod' => 'disconnect',
  };
}

sub _initSchema {
  my $self = shift;
  $logger->debug( __PACKAGE__ . "->_initSchema()" );
  #if (!$self->{schema_tangram}) {
    my $obj = getNewPerlObjectByPkgName($self->{locator}->{schema}, { EXPORT_OBJECTS => $self->{locator}->{classnames}, want_transactions => $self->{locator}->{want_transactions} } );
    $self->{schema_tangram} = $obj->getSchema();
  #}
  if (!$self->{schema_tangram}) {
    $logger->error( __PACKAGE__ . "->_initSchema: No Schema available for $self->{schema}" );
    return 0;
  }
  return 1;
}

sub connect {

    my $self = shift;
    
    my $dsn = shift;
    $dsn ||= $self->{locator}->{dbi}->{dsn};
    
    $logger->debug( __PACKAGE__ . "->connect( dsn $dsn )" );
    
    #my $storage = Tangram::Relational->connect( $schema, $dsn );
    #my $storage = Tangram::mysql->connect( $schema, $dsn );
    #$storage = Tangram::Relational->connect( Project->schema, $dsn );
    
#    if (!testDsn($dsn)) {
#      croak("Database at \"$dsn\" is not available");
#      return;
#    }

    return unless $self->_initSchema();

    # create the main tangram storage object
    #$self->{COREHANDLE} = Tangram::Relational->connect( $schema, $dsn );
    $self->{COREHANDLE} = Tangram::Relational->connect( $self->{schema_tangram}, $dsn );
  
    # some attempts for configuring the wrapped underlying dbi.....
    #$self->{STORAGEHANDLE_UNDERLYING} = $self->getUnderlyingStorage();
    #$self->{STORAGEHANDLE_UNDERLYING}->_configureCOREHANDLE();
    #$self->_configureUnderlyingStorage;
    
    # ..... encapsulation wins!
    $self->configureCOREHANDLE();

  $self->{locator}->{status}->{connected} = 1;

  return 1;

}

sub getChildNodes {

  my $self = shift;
  my @nodes;

  $logger->debug( __PACKAGE__ . "->getChildNodes()" );

  # create new DBI - Data::Storage - object from already connected DBI::db - handle inside the current COREHANDLE
  #my $loc = new Data::Storage::Locator( type => "DBI", dbi => { db => $self->{COREHANDLE}->{db} });
  #my $loc = new Data::Storage::Locator( type => "DBI", COREHANDLE => $self->{COREHANDLE}->{db} );
  
  # todo: should we retrieve information from the schema here
  # rather than poorly getting table names from underlying dbi?
  my $storage = $self->_getSubLayerHandle();
  @nodes = @{$storage->getChildNodes()};
  #$storage->_configureCOREHANDLE();
#print "getchildnodes\n";
#print Dumper($self);
  #if (my $result = $self->sendCommand( 'SHOW TABLES;' ) ) {
  
  $storage->disconnect();
  
  $self->{meta}->{childnodes} = \@nodes;
  
  return \@nodes;

}


sub testIntegrity {

  my $self = shift;

  $logger->debug( __PACKAGE__ . "->testIntegrity()" );

  # 1st test: are there tables?
  if (!$self->getChildNodes()) {
    $logger->warning( __PACKAGE__ . "->testIntegrity no childnodes exist" );
    return;
  }

  # 2nd test: is there a table named "Tangram"?
  if (!$self->existsChildNode("Tangram")) {
    $logger->warning( __PACKAGE__ . "->testIntegrity childnode \"Tangram\" doesn't exist" );
    return;
  }

  $self->{locator}->{status}->{integrity} = 1;
  return 1;

}


sub _getSubLayerHandle {
  
  my $self = shift;
  
  $logger->debug( __PACKAGE__ . "->_getSubLayerHandle()" );

  #print Dumper($self);

  # hack, make more generic!
  if (!$self->{dataStorageLayer}) {
    $logger->debug( __PACKAGE__ . "->_getSubLayerHandle() creating new dataStorageLayer" );
    #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->{locator}->{dbi} } );
    $self->{dataStorageLayer} = Data::Storage->new( $loc, { protected => 1 } );
    #$self->{STORAGE_UNDER_THE_HOOD}->{STORAGEHANDLE}->_configureCOREHANDLE();
    #$self->{STORAGE_UNDER_THE_HOOD}->_configureCOREHANDLE();
  }
  
  #print Dumper($self->{STORAGE_UNDER_THE_HOOD});
  
  return $self->{dataStorageLayer};
  
}

sub _configureUnderlyingStorage {
  
  my $self = shift;

  $logger->debug( __PACKAGE__ . "->_configureUnderlyingStorage" );

  $self->_configureCOREHANDLE_DBI();
  return;
  
  foreach my $key (keys %{$self->{dbi}}) {
    my $val = $self->{dbi}->{$key};
    print "entry: $key; $val", "\n";
    $self->{COREHANDLE}->{db}->{$key} = $val;
  }
  #print Dumper($self->{COREHANDLE}->{db});
}


sub configureCOREHANDLE {

  my $self = shift;

  $logger->debug( __PACKAGE__ . "->configureCOREHANDLE" );

  #my $subLayer = $self->_getSubLayerHandle();

  # apply configured modifications
    if (exists $self->{dbi}->{trace_level} && exists $self->{dbi}->{trace_file}) {
      $self->{COREHANDLE}->{db}->trace($self->{dbi}->{trace_level}, $self->{dbi}->{trace_file});
    }
    if (exists $self->{dbi}->{RaiseError}) {
      $self->{COREHANDLE}->{db}->{RaiseError} = $self->{dbi}->{RaiseError};
    }
    if (exists $self->{dbi}->{PrintError}) {
      $self->{COREHANDLE}->{db}->{PrintError} = $self->{dbi}->{PrintError};
    }
    if (exists $self->{dbi}->{HandleError}) {
      $self->{COREHANDLE}->{db}->{HandleError} = $self->{dbi}->{HandleError};
    }

}

sub deploySchema {
  my $self = shift;
  my $args = shift;
  
  my $dsn = $self->{locator}->{dbi}->{dsn};
  #my $dsn = $self->{dbi}->{dsn};

  $logger->debug( __PACKAGE__ . "->deploySchema( dsn $dsn )" );

  my $ok;
  # TODO: is this DBI->connect okay here like it is? regarding errors.....???
  if ( my $dbh = DBI->connect($dsn, '', '', {
                                                      PrintError => 0,
                                                    } ) ) {

    return unless $self->_initSchema();
    
    $ok = Tangram::Relational->deploy($self->{schema_tangram}, $dbh );
    $dbh->disconnect();
  }
  return $ok;
}

sub retreatSchema {

  my $self = shift;
  my $dsn = $self->{locator}->{dbi}->{dsn};
  #my $dsn = $self->{dbi}->{dsn};

  $logger->debug( __PACKAGE__ . "->retreatSchema( dsn $dsn )" );

  my $ok;
  if ( my $dbh = DBI->connect($dsn, '', '', {
                                                      #PrintError => 0,
                                                      #RaiseError => 0,
                                                    } ) ) {

    return unless $self->_initSchema();
    
    #use Data::Dumper; print Dumper($self);
    $self->{dataStorageLayer}->removeLogDispatchHandler("Tangram11");
    
    $ok = Tangram::Relational->retreat($self->{schema_tangram}, $dbh );
    $ok = 2;    # answer is "maybe" for now since Tangram::Relational->retreat doesn't seem to return a valid status
                    # idea: test this by checking for count of tables in database - 
                    #          problem with this: there may be some left not having been included to the schema
    $dbh->disconnect();
  }
  return $ok;
}

sub rebuildDbAndSchema {
  my $self = shift;
  $logger->info( __PACKAGE__ . "->rebuildDbAndSchema()" );
  my @results;

  # sum up results (bool (0/1)) in array
  push @results, $self->retreatSchema();
  push @results, $self->{dataStorageLayer}->dropDb();
  push @results, $self->{dataStorageLayer}->createDb();
  push @results, $self->deploySchema();

  # scan array for "bad ones"
  my $res = 1;
  map {
    $res = 0 if (!$_);
  } @results;
  
  return $res;
}

sub getListUnfiltered {
  my $self = shift;
  my $nodename = shift;
  my @results;
  $logger->debug( __PACKAGE__ . "->getListUnfiltered( nodename => '" . $nodename . "' )" );
  # get set of objects from odbms by object name
  my $object_set = $self->{COREHANDLE}->remote($nodename);
  @results = $self->{COREHANDLE}->select($object_set);
  return \@results;
}

sub getListFiltered {
  my $self = shift;

  # redirect to unfiltered mode
  #return $self->getListUnfiltered(@_);

  my $nodename = shift;
  my $filters = shift;
  my @results;
  $logger->debug( __PACKAGE__ . "->getListFiltered( nodename => '" . $nodename . "' )" );

  #print Dumper($filters);
  
  my @tfilters;
  
  foreach my $filter (@$filters) {
  
    # get filter - TODO: for each filter
    #my $filter = $filters->[0];
  
    # build filter
    my $lexpr = $filter->{key};
    #my $op = $filter->{op};
    my $op = '=';
    my $rexpr = $filter->{val};
    my $tight = 100;
    
  #  my $tfilter = Tangram::Filter->new(
  #    expr => "t1.$lexpr $op '$rexpr'",
  #    tight => $tight,
  #    objects => $objects,
  #  );
  
    # HACK: build eval-string (sorry) to get filtered list - please give advice here
    push @tfilters, '$remote->{' . $filter->{key} . '}' . " $filter->{op} '$filter->{val}'";

  }

  my $tfilter = join(' & ', @tfilters);

  # get set of objects from odbms by object name
  my $remote = $self->{COREHANDLE}->remote($nodename);
  
  # was:
  #@results = $self->{COREHANDLE}->select($object_set, $tfilter);

  # is:
  # HACK: build eval-string (sorry) to get filtered list - please give advice here
  my $evalstring = 'return $self->{COREHANDLE}->select($remote, ' . $tfilter . ');';
  
  # get filtered list/set
  @results = eval($evalstring);
  die $@ if $@;
  
  return \@results;
}

sub createCursor {
  my $self = shift;
  my $node = shift;
  my $cmdHandle = $self->{COREHANDLE}->cursor($node);
  my $result = Data::Storage::Result::Tangram->new( RESULTHANDLE => $cmdHandle );
  return $result;
}

sub createSet {
  my $self = shift;
  my @objects = @_;
  my $rh = Set::Object->new();
  foreach (@objects) {
    #print Dumper($_);
    $rh->insert($_) if !isEmpty($_);
  }
  #print Dumper($rh->members());
  my $result = Data::Storage::Result::Tangram->new( RESULTHANDLE => $rh );
  return $result;
}

sub sendQuery {
  my $self = shift;
  my $query = shift;
  #my $sql = "SELECT cs FROM $self->{metainfo}->{$descent}->{node} WHERE $self->{metainfo}->{$descent}->{IdentProvider}->{arg}='$self->{entry}->{source}->{ident}';";
  #my $result = $self->{metainfo}->{$descent}->{storage}->sendCommand($sql);

  #print Dumper($query);

  # HACK: special case: querying by id does not translate into a common tangram query
  # just load the object by given id(ent)
  if ($query->{criterias}->[0]->{key} eq 'id' && $query->{criterias}->[0]->{op} eq 'eq') {
    #print "LOAD!!!", "\n";
    #exit;
    #return Set::Object->new( $self->{COREHANDLE}->load($query->{criterias}->[0]->{val}) );
    my $ident = $query->{criterias}->[0]->{val};
#print "load obj", "\n";
    #return $self->createSet() if $ident == 5;
    my $object = $self->{COREHANDLE}->load($ident);
#print "get id", "\n";
    my $oid = $self->{COREHANDLE}->id($object);
    return $self->createSet($object);
    #return $self->createSet( $self->{COREHANDLE}->load('300090018') );
  }

  die("This should not be reached for now - redirect to \$self->getListFiltered() here!");

  # TODO: do a common tangram query here

  my @crits;
  foreach (@{$query->{criterias}}) {
    my $op = '';
    $op = '=' if lc $_->{op} eq 'eq';
    push @crits, "$_->{key}$op'$_->{val}'";
  }
  my $subnodes = {};
  map { $subnodes->{$_}++ } @{$query->{subnodes}};
  # HACK: this is hardcoded ;(    expand possibilities!
  #my $crit = join(' AND ', @crits);
  #my $sql = hash2Sql($query->{node}, $subnodes, 'SELECT', $crit);
  #return $self->sendCommand($sql);
  #my $h = $self->{COREHANDLE}->remote($query->{node});
  #my $res = $self->{COREHANDLE}->select($h, $h->{);
  return $self->createCursor($query->{node});
}

1;
1	joko	1.6	############################################
2	cvsjoko	1.1	#
3	joko	1.6	# $Id: Tangram.pm,v 1.5 2002/11/17 06:35:18 joko Exp $
4	joko	1.2	#
5			# $Log: Tangram.pm,v $
6	joko	1.6	# Revision 1.5 2002/11/17 06:35:18 joko
7			# + locator metadata can now be reached via ->{locator}
8			# - getChildNodes is now wrapped via COREHANDLE
9			#
10	joko	1.5	# Revision 1.4 2002/10/25 11:44:44 joko
11			# + sub _initSchema
12			# + sub existsChildNode
13			# + sub testIntegrity
14			# + sub rebuildDbAndSchema
15			#
16	joko	1.4	# Revision 1.3 2002/10/17 03:56:55 joko
17			# + bugfix: trapped eval error
18			#
19	joko	1.3	# Revision 1.2 2002/10/17 00:10:05 joko
20			# + removed dependency from tsobj.pm, schema is now independent
21			# + sub getNewPerlObjectByPkgName
22			# + sub deploySchema
23			# + sub retreatSchema
24			#
25	joko	1.2	# Revision 1.1 2002/10/10 03:44:07 cvsjoko
26			# + new
27	cvsjoko	1.1	#
28	joko	1.6	############################################
29
30	cvsjoko	1.1
31			package Data::Storage::Handler::Tangram;
32
33			use strict;
34			use warnings;
35
36			use base ("Data::Storage::Handler::Abstract");
37
38			use Tangram;
39			use Data::Dumper;
40	joko	1.6	use libp qw( getNewPerlObjectByPkgName );
41			use Data::Storage::Result::Tangram;
42			use Data::Compare::Struct qw( isEmpty );
43	cvsjoko	1.1
44			# get logger instance
45			my $logger = Log::Dispatch::Config->instance;
46
47
48	joko	1.6	sub getMetaInfo {
49			my $self = shift;
50			$logger->debug( __PACKAGE__ . "->getMetaInfo()" );
51			return {
52			'disconnectMethod' => 'disconnect',
53			};
54	joko	1.2	}
55
56	joko	1.4	sub _initSchema {
57			my $self = shift;
58			$logger->debug( __PACKAGE__ . "->_initSchema()" );
59			#if (!$self->{schema_tangram}) {
60	joko	1.5	my $obj = getNewPerlObjectByPkgName($self->{locator}->{schema}, { EXPORT_OBJECTS => $self->{locator}->{classnames}, want_transactions => $self->{locator}->{want_transactions} } );
61	joko	1.4	$self->{schema_tangram} = $obj->getSchema();
62			#}
63			if (!$self->{schema_tangram}) {
64			$logger->error( __PACKAGE__ . "->_initSchema: No Schema available for $self->{schema}" );
65			return 0;
66			}
67			return 1;
68			}
69
70	cvsjoko	1.1	sub connect {
71
72			my $self = shift;
73
74			my $dsn = shift;
75	joko	1.5	$dsn \|\|= $self->{locator}->{dbi}->{dsn};
76	cvsjoko	1.1
77	joko	1.2	$logger->debug( __PACKAGE__ . "->connect( dsn $dsn )" );
78	cvsjoko	1.1
79			#my $storage = Tangram::Relational->connect( $schema, $dsn );
80			#my $storage = Tangram::mysql->connect( $schema, $dsn );
81			#$storage = Tangram::Relational->connect( Project->schema, $dsn );
82
83			# if (!testDsn($dsn)) {
84			# croak("Database at \"$dsn\" is not available");
85			# return;
86			# }
87
88	joko	1.4	return unless $self->_initSchema();
89
90	joko	1.6	# create the main tangram storage object
91	joko	1.2	#$self->{COREHANDLE} = Tangram::Relational->connect( $schema, $dsn );
92			$self->{COREHANDLE} = Tangram::Relational->connect( $self->{schema_tangram}, $dsn );
93	cvsjoko	1.1
94	joko	1.6	# some attempts for configuring the wrapped underlying dbi.....
95	cvsjoko	1.1	#$self->{STORAGEHANDLE_UNDERLYING} = $self->getUnderlyingStorage();
96			#$self->{STORAGEHANDLE_UNDERLYING}->_configureCOREHANDLE();
97			#$self->_configureUnderlyingStorage;
98	joko	1.6
99			# ..... encapsulation wins!
100	cvsjoko	1.1	$self->configureCOREHANDLE();
101
102	joko	1.5	$self->{locator}->{status}->{connected} = 1;
103
104	joko	1.4	return 1;
105
106	cvsjoko	1.1	}
107
108			sub getChildNodes {
109
110			my $self = shift;
111			my @nodes;
112
113	joko	1.4	$logger->debug( __PACKAGE__ . "->getChildNodes()" );
114
115	cvsjoko	1.1	# create new DBI - Data::Storage - object from already connected DBI::db - handle inside the current COREHANDLE
116			#my $loc = new Data::Storage::Locator( type => "DBI", dbi => { db => $self->{COREHANDLE}->{db} });
117			#my $loc = new Data::Storage::Locator( type => "DBI", COREHANDLE => $self->{COREHANDLE}->{db} );
118	joko	1.6
119			# todo: should we retrieve information from the schema here
120			# rather than poorly getting table names from underlying dbi?
121	cvsjoko	1.1	my $storage = $self->_getSubLayerHandle();
122	joko	1.5	@nodes = @{$storage->getChildNodes()};
123	cvsjoko	1.1	#$storage->_configureCOREHANDLE();
124	joko	1.5	#print "getchildnodes\n";
125			#print Dumper($self);
126	cvsjoko	1.1	#if (my $result = $self->sendCommand( 'SHOW TABLES;' ) ) {
127
128			$storage->disconnect();
129
130	joko	1.4	$self->{meta}->{childnodes} = \@nodes;
131
132	cvsjoko	1.1	return \@nodes;
133
134			}
135
136
137	joko	1.4	sub testIntegrity {
138
139			my $self = shift;
140
141			$logger->debug( __PACKAGE__ . "->testIntegrity()" );
142
143			# 1st test: are there tables?
144			if (!$self->getChildNodes()) {
145			$logger->warning( __PACKAGE__ . "->testIntegrity no childnodes exist" );
146			return;
147			}
148
149			# 2nd test: is there a table named "Tangram"?
150			if (!$self->existsChildNode("Tangram")) {
151			$logger->warning( __PACKAGE__ . "->testIntegrity childnode \"Tangram\" doesn't exist" );
152			return;
153			}
154
155	joko	1.5	$self->{locator}->{status}->{integrity} = 1;
156	joko	1.4	return 1;
157
158			}
159
160
161	cvsjoko	1.1	sub _getSubLayerHandle {
162
163			my $self = shift;
164
165	joko	1.4	$logger->debug( __PACKAGE__ . "->_getSubLayerHandle()" );
166
167	cvsjoko	1.1	#print Dumper($self);
168	joko	1.5
169	cvsjoko	1.1	# hack, make more generic!
170	joko	1.4	if (!$self->{dataStorageLayer}) {
171			$logger->debug( __PACKAGE__ . "->_getSubLayerHandle() creating new dataStorageLayer" );
172			#my $loc = Data::Storage::Locator->new( type => "DBI", dbi => $self->{dbi}, COREHANDLE => $self->{COREHANDLE}->{db} );
173	joko	1.5	my $loc = Data::Storage::Locator->new( { type => "DBI", dbi => $self->{locator}->{dbi} } );
174	joko	1.4	$self->{dataStorageLayer} = Data::Storage->new( $loc, { protected => 1 } );
175	cvsjoko	1.1	#$self->{STORAGE_UNDER_THE_HOOD}->{STORAGEHANDLE}->_configureCOREHANDLE();
176			#$self->{STORAGE_UNDER_THE_HOOD}->_configureCOREHANDLE();
177			}
178
179			#print Dumper($self->{STORAGE_UNDER_THE_HOOD});
180
181	joko	1.4	return $self->{dataStorageLayer};
182	cvsjoko	1.1
183			}
184
185			sub _configureUnderlyingStorage {
186
187			my $self = shift;
188	joko	1.4
189			$logger->debug( __PACKAGE__ . "->_configureUnderlyingStorage" );
190
191	cvsjoko	1.1	$self->_configureCOREHANDLE_DBI();
192			return;
193
194			foreach my $key (keys %{$self->{dbi}}) {
195			my $val = $self->{dbi}->{$key};
196			print "entry: $key; $val", "\n";
197			$self->{COREHANDLE}->{db}->{$key} = $val;
198			}
199			#print Dumper($self->{COREHANDLE}->{db});
200			}
201
202
203			sub configureCOREHANDLE {
204
205			my $self = shift;
206
207	joko	1.4	$logger->debug( __PACKAGE__ . "->configureCOREHANDLE" );
208	cvsjoko	1.1
209			#my $subLayer = $self->_getSubLayerHandle();
210
211			# apply configured modifications
212			if (exists $self->{dbi}->{trace_level} && exists $self->{dbi}->{trace_file}) {
213			$self->{COREHANDLE}->{db}->trace($self->{dbi}->{trace_level}, $self->{dbi}->{trace_file});
214			}
215			if (exists $self->{dbi}->{RaiseError}) {
216			$self->{COREHANDLE}->{db}->{RaiseError} = $self->{dbi}->{RaiseError};
217			}
218			if (exists $self->{dbi}->{PrintError}) {
219			$self->{COREHANDLE}->{db}->{PrintError} = $self->{dbi}->{PrintError};
220			}
221			if (exists $self->{dbi}->{HandleError}) {
222			$self->{COREHANDLE}->{db}->{HandleError} = $self->{dbi}->{HandleError};
223			}
224
225	joko	1.2	}
226
227			sub deploySchema {
228			my $self = shift;
229	joko	1.5	my $args = shift;
230
231			my $dsn = $self->{locator}->{dbi}->{dsn};
232			#my $dsn = $self->{dbi}->{dsn};
233	joko	1.4
234			$logger->debug( __PACKAGE__ . "->deploySchema( dsn $dsn )" );
235
236	joko	1.2	my $ok;
237	joko	1.5	# TODO: is this DBI->connect okay here like it is? regarding errors.....???
238	joko	1.2	if ( my $dbh = DBI->connect($dsn, '', '', {
239			PrintError => 0,
240			} ) ) {
241	joko	1.4
242			return unless $self->_initSchema();
243
244			$ok = Tangram::Relational->deploy($self->{schema_tangram}, $dbh );
245	joko	1.2	$dbh->disconnect();
246			}
247			return $ok;
248			}
249
250			sub retreatSchema {
251	joko	1.4
252	joko	1.2	my $self = shift;
253	joko	1.5	my $dsn = $self->{locator}->{dbi}->{dsn};
254			#my $dsn = $self->{dbi}->{dsn};
255	joko	1.4
256			$logger->debug( __PACKAGE__ . "->retreatSchema( dsn $dsn )" );
257
258	joko	1.2	my $ok;
259			if ( my $dbh = DBI->connect($dsn, '', '', {
260	joko	1.4	#PrintError => 0,
261			#RaiseError => 0,
262	joko	1.2	} ) ) {
263	joko	1.4
264			return unless $self->_initSchema();
265
266			#use Data::Dumper; print Dumper($self);
267			$self->{dataStorageLayer}->removeLogDispatchHandler("Tangram11");
268
269			$ok = Tangram::Relational->retreat($self->{schema_tangram}, $dbh );
270			$ok = 2; # answer is "maybe" for now since Tangram::Relational->retreat doesn't seem to return a valid status
271			# idea: test this by checking for count of tables in database -
272			# problem with this: there may be some left not having been included to the schema
273	joko	1.2	$dbh->disconnect();
274			}
275			return $ok;
276	joko	1.4	}
277
278			sub rebuildDbAndSchema {
279			my $self = shift;
280			$logger->info( __PACKAGE__ . "->rebuildDbAndSchema()" );
281			my @results;
282
283			# sum up results (bool (0/1)) in array
284			push @results, $self->retreatSchema();
285			push @results, $self->{dataStorageLayer}->dropDb();
286			push @results, $self->{dataStorageLayer}->createDb();
287			push @results, $self->deploySchema();
288
289			# scan array for "bad ones"
290			my $res = 1;
291			map {
292			$res = 0 if (!$_);
293			} @results;
294
295			return $res;
296	joko	1.6	}
297
298			sub getListUnfiltered {
299			my $self = shift;
300			my $nodename = shift;
301			my @results;
302			$logger->debug( __PACKAGE__ . "->getListUnfiltered( nodename => '" . $nodename . "' )" );
303			# get set of objects from odbms by object name
304			my $object_set = $self->{COREHANDLE}->remote($nodename);
305			@results = $self->{COREHANDLE}->select($object_set);
306			return \@results;
307			}
308
309			sub getListFiltered {
310			my $self = shift;
311
312			# redirect to unfiltered mode
313			#return $self->getListUnfiltered(@_);
314
315			my $nodename = shift;
316			my $filters = shift;
317			my @results;
318			$logger->debug( __PACKAGE__ . "->getListFiltered( nodename => '" . $nodename . "' )" );
319
320			#print Dumper($filters);
321
322			my @tfilters;
323
324			foreach my $filter (@$filters) {
325
326			# get filter - TODO: for each filter
327			#my $filter = $filters->[0];
328
329			# build filter
330			my $lexpr = $filter->{key};
331			#my $op = $filter->{op};
332			my $op = '=';
333			my $rexpr = $filter->{val};
334			my $tight = 100;
335
336			# my $tfilter = Tangram::Filter->new(
337			# expr => "t1.$lexpr $op '$rexpr'",
338			# tight => $tight,
339			# objects => $objects,
340			# );
341
342			# HACK: build eval-string (sorry) to get filtered list - please give advice here
343			push @tfilters, '$remote->{' . $filter->{key} . '}' . " $filter->{op} '$filter->{val}'";
344
345			}
346
347			my $tfilter = join(' & ', @tfilters);
348
349			# get set of objects from odbms by object name
350			my $remote = $self->{COREHANDLE}->remote($nodename);
351
352			# was:
353			#@results = $self->{COREHANDLE}->select($object_set, $tfilter);
354
355			# is:
356			# HACK: build eval-string (sorry) to get filtered list - please give advice here
357			my $evalstring = 'return $self->{COREHANDLE}->select($remote, ' . $tfilter . ');';
358
359			# get filtered list/set
360			@results = eval($evalstring);
361			die $@ if $@;
362
363			return \@results;
364			}
365
366			sub createCursor {
367			my $self = shift;
368			my $node = shift;
369			my $cmdHandle = $self->{COREHANDLE}->cursor($node);
370			my $result = Data::Storage::Result::Tangram->new( RESULTHANDLE => $cmdHandle );
371			return $result;
372			}
373
374			sub createSet {
375			my $self = shift;
376			my @objects = @_;
377			my $rh = Set::Object->new();
378			foreach (@objects) {
379			#print Dumper($_);
380			$rh->insert($_) if !isEmpty($_);
381			}
382			#print Dumper($rh->members());
383			my $result = Data::Storage::Result::Tangram->new( RESULTHANDLE => $rh );
384			return $result;
385			}
386
387			sub sendQuery {
388			my $self = shift;
389			my $query = shift;
390			#my $sql = "SELECT cs FROM $self->{metainfo}->{$descent}->{node} WHERE $self->{metainfo}->{$descent}->{IdentProvider}->{arg}='$self->{entry}->{source}->{ident}';";
391			#my $result = $self->{metainfo}->{$descent}->{storage}->sendCommand($sql);
392
393			#print Dumper($query);
394
395			# HACK: special case: querying by id does not translate into a common tangram query
396			# just load the object by given id(ent)
397			if ($query->{criterias}->[0]->{key} eq 'id' && $query->{criterias}->[0]->{op} eq 'eq') {
398			#print "LOAD!!!", "\n";
399			#exit;
400			#return Set::Object->new( $self->{COREHANDLE}->load($query->{criterias}->[0]->{val}) );
401			my $ident = $query->{criterias}->[0]->{val};
402			#print "load obj", "\n";
403			#return $self->createSet() if $ident == 5;
404			my $object = $self->{COREHANDLE}->load($ident);
405			#print "get id", "\n";
406			my $oid = $self->{COREHANDLE}->id($object);
407			return $self->createSet($object);
408			#return $self->createSet( $self->{COREHANDLE}->load('300090018') );
409			}
410
411			die("This should not be reached for now - redirect to \$self->getListFiltered() here!");
412
413			# TODO: do a common tangram query here
414
415			my @crits;
416			foreach (@{$query->{criterias}}) {
417			my $op = '';
418			$op = '=' if lc $_->{op} eq 'eq';
419			push @crits, "$_->{key}$op'$_->{val}'";
420			}
421			my $subnodes = {};
422			map { $subnodes->{$_}++ } @{$query->{subnodes}};
423			# HACK: this is hardcoded ;( expand possibilities!
424			#my $crit = join(' AND ', @crits);
425			#my $sql = hash2Sql($query->{node}, $subnodes, 'SELECT', $crit);
426			#return $self->sendCommand($sql);
427			#my $h = $self->{COREHANDLE}->remote($query->{node});
428			#my $res = $self->{COREHANDLE}->select($h, $h->{);
429			return $self->createCursor($query->{node});
430	cvsjoko	1.1	}
431
432			1;
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