Storage/Handler/Abstract.pm

##    --------------------------------------------------------------------------------
##    $Id: Abstract.pm,v 1.7 2002/12/05 07:57:48 joko Exp $
##    --------------------------------------------------------------------------------
##    $Log: Abstract.pm,v $
##    Revision 1.7  2002/12/05 07:57:48  joko
##    + now using Tie::SecureHash as a base for the COREHANDLE
##    + former public COREHANDLE becomes private _COREHANDLE now
##
##    Revision 1.6  2002/12/03 15:52:24  joko
##    + fix/feature: if dispatching to deep core method fails (is not declared), try method at Data::Storage - level
##
##    Revision 1.5  2002/12/01 22:19:33  joko
##    + just disconnect if COREHANDLE exists
##
##    Revision 1.4  2002/12/01 04:45:38  joko
##    + sub eraseAll
##    + sub createDb
##
##    Revision 1.3  2002/11/29 04:58:20  joko
##    + Storage::Result now uses the same dispatching mechanism like Storage::Handler
##
##    Revision 1.2  2002/10/17 00:08:07  joko
##    + bugfixes regarding "deep recursion" stuff
##
##    Revision 1.1  2002/10/10 03:44:07  cvsjoko
##    + new
##    --------------------------------------------------------------------------------


package Data::Storage::Handler::Abstract;

use strict;
use warnings;

use base qw( DesignPattern::Object );

use Data::Dumper;
use Tie::SecureHash;
#use Data::Storage::Handler;

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

#our $lock_info;

sub new {
  my $invocant = shift;
  my $class = ref($invocant) || $invocant;
  
  # logging info about the actual handler called
    $logger->debug( "$invocant->new( @_ )" );
    #$logger->debug( __PACKAGE__ . "->" . "new()" );

  # V1 - arguments become properties automagically / normal perl mode blessing
=pod
  # autovivify passed-in arguments as future object attributes into to-be-blessed hash
  my $self = { @_ };
  # create object from blessed hash-reference
  bless $self, $class;
=cut


  # V2 - maybe more convenient/secure? utilizing Damian Conway's Tie::SecureHash...
  my $self = Tie::SecureHash->new(
    $class,
    # that's it:
      'metainfo' => undef,
      'lock_info' => undef,
      '_COREHANDLE' => undef,
      'meta' => undef,
      'locator' => undef,
      'dataStorageLayer' => undef,
      'dbi' => undef,
    # tries:
      #'Data::Storage::Handler::Abstract::metainfo' => undef,
      #'dataStorageLayer'
      #'Data::Storage::Handler::Abstract::dataStorageLayer' => undef,
      #'Data::Storage::Handler::Tangram::dataStorageLayer' => undef,
      #'Data::Dumper::locator' => undef,
      #$class . '::locator' => undef,
      #'Data::Storage::Handler::Tangram::locator' => undef,
      #'Data::Storage::Handler::DBI::locator' => undef,
      #_protected => ,
      #__private => ,
  );


  # merge passed-in arguments to constructor as properties into already blessed secure object
    
    # mungle arguments from array into hash - perl does the job  ;)
    my %args = @_;
  
    # merge attributes one-by-one
    # TODO: deep_copy? / merge_deep?
    foreach (keys %args) {
      #print "key: $_", "\n";
      $self->{$_} = $args{$_};
    }
  
  # V3 - rolling our own security (just for {COREHANDLE} - nothing else)  -  nope, Tie::SecureHash works wonderful
  #my $self = { @_ };
  #bless $self, $class;
  
  
  # handle meta data
    #my $metainfo = $self->getMetaInfo($class);
    my $metainfo = $self->getMetaInfo();
    if (!$metainfo->{disconnectMethod}) { $metainfo->{disconnectMethod} = 'disconnect'; }
    # type?
    $invocant =~ s/Data::Storage::Handler:://;
    $metainfo->{type} = $invocant;

    # direct accessible (non-protected) properties         ( was: my $self = { }; )
    $self->{metainfo} = $metainfo;

  return $self;
}


sub AUTOLOAD {

  # recursion problem to be avoided here!!!
  
    # - problem: we get recursion-hangs!!!   =>  perl stops with ...
    # "Deep recursion on subroutine "Data::Storage::Handler::Abstract::AUTOLOAD" at [...]/libs/Data/Storage.pm line 38."
    
    # - when: if we log to ourselves as a storage-implementation (e.g. via Log::Dispatch::Tangram)
    # - why:  debug-messages are on a very low level including every data-operation to "Data::Storage(::Handler::X)",
    #             so e.g. a "$storage->insert" would trigger another "$storage->insert" itself 
    #             which leads to a infinite recursion loop (deep recursion)
    # - solution: locks! (by Hack or (maybe) via Perl "local"s)

  my $self = shift;

  our $AUTOLOAD;
  #return if $AUTOLOAD =~ m/::DESTROY$/;

  # find out methodname
  my $methodname = $AUTOLOAD;
  $methodname =~ s/^.*:://;
  
#print "method: $methodname", "\n";
  
  # TODO: document this! handler-private methods listed here will not be triggered (internal use)
  # in this case, "exists" is a method reserved for Tie::SecureHash,
  # which encapsulates the perl data structure (HASH) under this object
  # this is to prevent deep recursion's
  return if lc $methodname eq 'exists';

#print "$methodname - 1", "\n";

  # TODO: enhance logging/debugging
  #if (!$self->exists('COREHANDLE')) { return; }

  # handle locking (hack)
  if ($self->exists('lock_info') && $self->{lock_info}->{last_method} && $methodname eq $self->{lock_info}->{last_method}) {
    $self->{lock_info}->{log_lock} = 1;
  } else {
    $self->{lock_info}->{log_lock} = 0;
  }
  $self->{lock_info}->{last_method} = $methodname;
  
#print "$methodname - 2", "\n";

#print Dumper($self);
#exit;

  # get corehandle instance from underlying handler
  my $core = $self->getCOREHANDLE();

  # test for COREHANDLE
  #if (!$self->{_COREHANDLE}) {
#=pod
  #if (!$self->exists('_COREHANDLE')) {
  #if (!$self->{_COREHANDLE}) {
  if (!$core) {
    my $err_msg_core = __PACKAGE__ . "[$self->{metainfo}->{type}]" . ": " . "COREHANDLE is undefined while trying to execute method \"$methodname\"";
print $err_msg_core, "\n";
    if ($self->exists('lock_info') && !$self->{lock_info}->{log_lock}) {
      $logger->error( $err_msg_core );
    }
    return;
  }
#=cut

#print "$methodname - 3", "\n";

  # try to dispatch method-call to Storage::Handler::*
  #if ($self->can($methodname)) {
    #$logger->debug( __PACKAGE__ . "[$self->{metainfo}->{type}]" . "->" . $methodname . "(@_)" );
    #my $res = $self->$methodname(@_);
    #if ($res) { return $res; }
  #}

#print "$methodname - 4", "\n";

  # try to dispatch method-call to COREHANDLE
  # was:
  #my $core = $self->{_COREHANDLE};
  # is:
  #my $core = $self->getCOREHANDLE();

#print Dumper($core);
#exit;

  # was:
  #if ($self->{_COREHANDLE}->can($methodname) || $self->{_COREHANDLE}->can("AUTOLOAD")) {
  # is:
  if ($core->can($methodname) || $core->can("AUTOLOAD")) {
    #$logger->debug( __PACKAGE__ . "->" . $methodname . " (AUTOLOAD)" );
    #$lock_AUTOLOAD = 1 if ($methodname eq 'insert');
    if (!$self->{lock_info}->{log_lock}) {
      #print "method: $methodname", "\n";
      $logger->debug( __PACKAGE__ . "[$self->{metainfo}->{type}]" . "->" . $methodname . "(@_)" );
    } else {
      # AUTOLOAD - sub is locked to prevent deep recursions if (e.g.) db-inserts cause log-actions to same db itself
    }
    #$lock_AUTOLOAD = 0;
    #$logger->log( level => 'debug', message => __PACKAGE__ . "->" . $methodname . " (AUTOLOAD)" );
    
#print "calling: $methodname", "\n";
    
    # method calls doing it until here will get dispatched to the proper handler
    return $core->$methodname(@_);
  
  } elsif ($self->can($methodname)) {
    return $self->$methodname(@_);
  }

}

sub DESTROY {
  my $self = shift;
  #if ($self->{COREHANDLE}) {
  if ($self->exists('_COREHANDLE')) {
    $logger->debug( __PACKAGE__ . "[$self->{metainfo}->{type}]" . "->DESTROY" );

    my $disconnectMethod = $self->{metainfo}->{disconnectMethod};

    # call "disconnect" or alike on COREHANDLE
    # was: $self->{COREHANDLE}->disconnect();
    $disconnectMethod && $self->{_COREHANDLE} && ( $self->{_COREHANDLE}->$disconnectMethod() );

    undef $self->{_COREHANDLE};
  }
}

sub _typeCheck2 {
  my $type = shift;
  print "type: $type";
  eval("use Data::Storage::$type;");
}


# ====================================================
#   PUBLIC METHODS
# ====================================================

  sub existsChildNode {
    my $self = shift;
    my $nodename = shift;
    #$nodename = 'TransactionRoutingTable';
    $logger->debug( __PACKAGE__ . "->getChildNode( nodename $nodename )" );
    $self->getChildNodes() unless $self->{meta}->{childnodes};
    my $result = grep(m/$nodename/i, @{$self->{meta}->{childnodes}});     # TODO: use "/i" only on win32-systems!
    return $result;
  }

  sub connect_tmp {
    
#    my $self = shift;
#    my $connectionString = shift;
#    # todo: patch connectionString to $args
#    _typeCheck($self->{args}{type});

  }
  

# ====================================================
#   CONCRETE METHOD DUMMIES (croaking via "$logger" by calling "_abstract_function")
# ====================================================

  # TODO:
  #   - abstract "abstract methods" to list/hash to be used in AUTOLOAD
  #      e.g.: my @ABSTRACT_METHODS = (qw( connect sendCommand getChildNodes ));
  #      use Class::XYZ (Construct)
  #   - build them via anonymous subs 
  #   - introduce them via symbols

  sub getCOREHANDLE {
    my $self = shift;
    $self->_abstract_function('getCOREHANDLE');
  }

  sub sendCommand {
    my $self = shift;
    $self->_abstract_function('sendCommand');
  }

  sub existsChildNode_tmp {
    my $self = shift;
    $self->_abstract_function('existsChildNode');
  }

  sub getChildNodes {
    my $self = shift;
    $self->_abstract_function('getChildNodes');
  }

  sub configureCOREHANDLE {
    my $self = shift;
    $self->_abstract_function('configureCOREHANDLE');
  }

  sub getMetaInfo {
    my $self = shift;
    $self->_abstract_function('getMetaInfo');
    return;
  }

  sub getListUnfiltered {
    my $self = shift;
    $self->_abstract_function('getListUnfiltered');
    return;
  }

  sub getListFiltered {
    my $self = shift;
    $self->_abstract_function('getListFiltered');
    return;
  }

  sub sendQuery {
    my $self = shift;
    $self->_abstract_function('sendQuery');
    return;
  }

  sub connect {
    my $self = shift;
    $self->_abstract_function('connect');
    return;
  }

  sub testIntegrity {
    my $self = shift;
    $self->_abstract_function('testIntegrity');
    return;
  }

  sub quoteSql {
    my $self = shift;
    $self->_abstract_function('quoteSql');
    return;
  }

  sub eraseAll {
    my $self = shift;
    $self->_abstract_function('eraseAll');
    return;
  }

  sub createDb {
    my $self = shift;
    $self->_abstract_function('createDb');
    return;
  }

1;
1	joko	1.7	## --------------------------------------------------------------------------------
2	joko	1.8	## $Id: Abstract.pm,v 1.7 2002/12/05 07:57:48 joko Exp $
3	joko	1.7	## --------------------------------------------------------------------------------
4			## $Log: Abstract.pm,v $
5	joko	1.8	## Revision 1.7 2002/12/05 07:57:48 joko
6			## + now using Tie::SecureHash as a base for the COREHANDLE
7			## + former public COREHANDLE becomes private _COREHANDLE now
8			##
9	joko	1.7	## Revision 1.6 2002/12/03 15:52:24 joko
10			## + fix/feature: if dispatching to deep core method fails (is not declared), try method at Data::Storage - level
11			##
12			## Revision 1.5 2002/12/01 22:19:33 joko
13			## + just disconnect if COREHANDLE exists
14			##
15			## Revision 1.4 2002/12/01 04:45:38 joko
16			## + sub eraseAll
17			## + sub createDb
18			##
19			## Revision 1.3 2002/11/29 04:58:20 joko
20			## + Storage::Result now uses the same dispatching mechanism like Storage::Handler
21			##
22			## Revision 1.2 2002/10/17 00:08:07 joko
23			## + bugfixes regarding "deep recursion" stuff
24			##
25			## Revision 1.1 2002/10/10 03:44:07 cvsjoko
26			## + new
27			## --------------------------------------------------------------------------------
28
29	cvsjoko	1.1
30			package Data::Storage::Handler::Abstract;
31
32			use strict;
33			use warnings;
34
35	joko	1.8	use base qw( DesignPattern::Object );
36
37	cvsjoko	1.1	use Data::Dumper;
38	joko	1.7	use Tie::SecureHash;
39			#use Data::Storage::Handler;
40	cvsjoko	1.1
41			# get logger instance
42			my $logger = Log::Dispatch::Config->instance;
43
44			#our $lock_info;
45
46			sub new {
47			my $invocant = shift;
48			my $class = ref($invocant) \|\| $invocant;
49
50			# logging info about the actual handler called
51			$logger->debug( "$invocant->new( @_ )" );
52	joko	1.2	#$logger->debug( __PACKAGE__ . "->" . "new()" );
53	cvsjoko	1.1
54	joko	1.7	# V1 - arguments become properties automagically / normal perl mode blessing
55			=pod
56			# autovivify passed-in arguments as future object attributes into to-be-blessed hash
57	joko	1.3	my $self = { @_ };
58			# create object from blessed hash-reference
59			bless $self, $class;
60	joko	1.7	=cut
61
62
63			# V2 - maybe more convenient/secure? utilizing Damian Conway's Tie::SecureHash...
64			my $self = Tie::SecureHash->new(
65			$class,
66			# that's it:
67			'metainfo' => undef,
68			'lock_info' => undef,
69			'_COREHANDLE' => undef,
70			'meta' => undef,
71			'locator' => undef,
72			'dataStorageLayer' => undef,
73			'dbi' => undef,
74			# tries:
75			#'Data::Storage::Handler::Abstract::metainfo' => undef,
76			#'dataStorageLayer'
77			#'Data::Storage::Handler::Abstract::dataStorageLayer' => undef,
78			#'Data::Storage::Handler::Tangram::dataStorageLayer' => undef,
79			#'Data::Dumper::locator' => undef,
80			#$class . '::locator' => undef,
81			#'Data::Storage::Handler::Tangram::locator' => undef,
82			#'Data::Storage::Handler::DBI::locator' => undef,
83			#_protected => ,
84			#__private => ,
85			);
86
87
88			# merge passed-in arguments to constructor as properties into already blessed secure object
89
90			# mungle arguments from array into hash - perl does the job ;)
91			my %args = @_;
92
93			# merge attributes one-by-one
94			# TODO: deep_copy? / merge_deep?
95			foreach (keys %args) {
96			#print "key: $_", "\n";
97			$self->{$_} = $args{$_};
98			}
99
100			# V3 - rolling our own security (just for {COREHANDLE} - nothing else) - nope, Tie::SecureHash works wonderful
101			#my $self = { @_ };
102			#bless $self, $class;
103
104
105	joko	1.3
106	cvsjoko	1.1	# handle meta data
107	joko	1.3	#my $metainfo = $self->getMetaInfo($class);
108			my $metainfo = $self->getMetaInfo();
109	cvsjoko	1.1	if (!$metainfo->{disconnectMethod}) { $metainfo->{disconnectMethod} = 'disconnect'; }
110			# type?
111			$invocant =~ s/Data::Storage::Handler:://;
112			$metainfo->{type} = $invocant;
113
114			# direct accessible (non-protected) properties ( was: my $self = { }; )
115	joko	1.3	$self->{metainfo} = $metainfo;
116	cvsjoko	1.1
117			return $self;
118			}
119
120
121			sub AUTOLOAD {
122
123			# recursion problem to be avoided here!!!
124
125			# - problem: we get recursion-hangs!!! => perl stops with ...
126			# "Deep recursion on subroutine "Data::Storage::Handler::Abstract::AUTOLOAD" at [...]/libs/Data/Storage.pm line 38."
127
128			# - when: if we log to ourselves as a storage-implementation (e.g. via Log::Dispatch::Tangram)
129			# - why: debug-messages are on a very low level including every data-operation to "Data::Storage(::Handler::X)",
130			# so e.g. a "$storage->insert" would trigger another "$storage->insert" itself
131			# which leads to a infinite recursion loop (deep recursion)
132	joko	1.2	# - solution: locks! (by Hack or (maybe) via Perl "local"s)
133	cvsjoko	1.1
134			my $self = shift;
135
136			our $AUTOLOAD;
137			#return if $AUTOLOAD =~ m/::DESTROY$/;
138
139			# find out methodname
140			my $methodname = $AUTOLOAD;
141			$methodname =~ s/^.*:://;
142	joko	1.7
143			#print "method: $methodname", "\n";
144
145			# TODO: document this! handler-private methods listed here will not be triggered (internal use)
146			# in this case, "exists" is a method reserved for Tie::SecureHash,
147			# which encapsulates the perl data structure (HASH) under this object
148			# this is to prevent deep recursion's
149			return if lc $methodname eq 'exists';
150
151			#print "$methodname - 1", "\n";
152
153			# TODO: enhance logging/debugging
154			#if (!$self->exists('COREHANDLE')) { return; }
155	cvsjoko	1.1
156			# handle locking (hack)
157	joko	1.7	if ($self->exists('lock_info') && $self->{lock_info}->{last_method} && $methodname eq $self->{lock_info}->{last_method}) {
158	cvsjoko	1.1	$self->{lock_info}->{log_lock} = 1;
159			} else {
160			$self->{lock_info}->{log_lock} = 0;
161			}
162			$self->{lock_info}->{last_method} = $methodname;
163
164	joko	1.7	#print "$methodname - 2", "\n";
165
166			#print Dumper($self);
167			#exit;
168
169			# get corehandle instance from underlying handler
170			my $core = $self->getCOREHANDLE();
171
172	cvsjoko	1.1	# test for COREHANDLE
173	joko	1.7	#if (!$self->{_COREHANDLE}) {
174			#=pod
175			#if (!$self->exists('_COREHANDLE')) {
176			#if (!$self->{_COREHANDLE}) {
177			if (!$core) {
178			my $err_msg_core = __PACKAGE__ . "[$self->{metainfo}->{type}]" . ": " . "COREHANDLE is undefined while trying to execute method \"$methodname\"";
179			print $err_msg_core, "\n";
180			if ($self->exists('lock_info') && !$self->{lock_info}->{log_lock}) {
181			$logger->error( $err_msg_core );
182	joko	1.2	}
183	cvsjoko	1.1	return;
184			}
185	joko	1.7	#=cut
186
187			#print "$methodname - 3", "\n";
188	cvsjoko	1.1
189			# try to dispatch method-call to Storage::Handler::*
190			#if ($self->can($methodname)) {
191			#$logger->debug( __PACKAGE__ . "[$self->{metainfo}->{type}]" . "->" . $methodname . "(@_)" );
192			#my $res = $self->$methodname(@_);
193			#if ($res) { return $res; }
194			#}
195
196	joko	1.7	#print "$methodname - 4", "\n";
197
198	cvsjoko	1.1	# try to dispatch method-call to COREHANDLE
199	joko	1.7	# was:
200			#my $core = $self->{_COREHANDLE};
201			# is:
202			#my $core = $self->getCOREHANDLE();
203
204			#print Dumper($core);
205			#exit;
206
207			# was:
208			#if ($self->{_COREHANDLE}->can($methodname) \|\| $self->{_COREHANDLE}->can("AUTOLOAD")) {
209			# is:
210			if ($core->can($methodname) \|\| $core->can("AUTOLOAD")) {
211	cvsjoko	1.1	#$logger->debug( __PACKAGE__ . "->" . $methodname . " (AUTOLOAD)" );
212			#$lock_AUTOLOAD = 1 if ($methodname eq 'insert');
213			if (!$self->{lock_info}->{log_lock}) {
214			#print "method: $methodname", "\n";
215			$logger->debug( __PACKAGE__ . "[$self->{metainfo}->{type}]" . "->" . $methodname . "(@_)" );
216			} else {
217			# AUTOLOAD - sub is locked to prevent deep recursions if (e.g.) db-inserts cause log-actions to same db itself
218			}
219			#$lock_AUTOLOAD = 0;
220			#$logger->log( level => 'debug', message => __PACKAGE__ . "->" . $methodname . " (AUTOLOAD)" );
221	joko	1.3
222	joko	1.7	#print "calling: $methodname", "\n";
223
224	joko	1.3	# method calls doing it until here will get dispatched to the proper handler
225	joko	1.7	return $core->$methodname(@_);
226	joko	1.6
227			} elsif ($self->can($methodname)) {
228			return $self->$methodname(@_);
229	cvsjoko	1.1	}
230
231			}
232
233			sub DESTROY {
234			my $self = shift;
235	joko	1.7	#if ($self->{COREHANDLE}) {
236			if ($self->exists('_COREHANDLE')) {
237	cvsjoko	1.1	$logger->debug( __PACKAGE__ . "[$self->{metainfo}->{type}]" . "->DESTROY" );
238
239			my $disconnectMethod = $self->{metainfo}->{disconnectMethod};
240
241			# call "disconnect" or alike on COREHANDLE
242			# was: $self->{COREHANDLE}->disconnect();
243	joko	1.7	$disconnectMethod && $self->{_COREHANDLE} && ( $self->{_COREHANDLE}->$disconnectMethod() );
244	cvsjoko	1.1
245	joko	1.7	undef $self->{_COREHANDLE};
246	cvsjoko	1.1	}
247			}
248
249	joko	1.7	sub _typeCheck2 {
250	cvsjoko	1.1	my $type = shift;
251			print "type: $type";
252			eval("use Data::Storage::$type;");
253			}
254
255
256			# ====================================================
257			# PUBLIC METHODS
258			# ====================================================
259
260	joko	1.3	sub existsChildNode {
261			my $self = shift;
262			my $nodename = shift;
263			#$nodename = 'TransactionRoutingTable';
264			$logger->debug( __PACKAGE__ . "->getChildNode( nodename $nodename )" );
265			$self->getChildNodes() unless $self->{meta}->{childnodes};
266			my $result = grep(m/$nodename/i, @{$self->{meta}->{childnodes}}); # TODO: use "/i" only on win32-systems!
267			return $result;
268			}
269	cvsjoko	1.1
270	joko	1.3	sub connect_tmp {
271	cvsjoko	1.1
272			# my $self = shift;
273			# my $connectionString = shift;
274			# # todo: patch connectionString to $args
275			# _typeCheck($self->{args}{type});
276
277			}
278
279	joko	1.3
280			# ====================================================
281			# CONCRETE METHOD DUMMIES (croaking via "$logger" by calling "_abstract_function")
282			# ====================================================
283
284			# TODO:
285			# - abstract "abstract methods" to list/hash to be used in AUTOLOAD
286			# e.g.: my @ABSTRACT_METHODS = (qw( connect sendCommand getChildNodes ));
287	joko	1.4	# use Class::XYZ (Construct)
288	joko	1.3	# - build them via anonymous subs
289			# - introduce them via symbols
290
291	joko	1.7	sub getCOREHANDLE {
292			my $self = shift;
293			$self->_abstract_function('getCOREHANDLE');
294			}
295
296	cvsjoko	1.1	sub sendCommand {
297			my $self = shift;
298			$self->_abstract_function('sendCommand');
299	joko	1.7	}
300
301			sub existsChildNode_tmp {
302			my $self = shift;
303			$self->_abstract_function('existsChildNode');
304	cvsjoko	1.1	}
305
306			sub getChildNodes {
307			my $self = shift;
308			$self->_abstract_function('getChildNodes');
309			}
310
311			sub configureCOREHANDLE {
312			my $self = shift;
313			$self->_abstract_function('configureCOREHANDLE');
314			}
315
316	joko	1.3	sub getMetaInfo {
317			my $self = shift;
318			$self->_abstract_function('getMetaInfo');
319			return;
320			}
321
322			sub getListUnfiltered {
323			my $self = shift;
324			$self->_abstract_function('getListUnfiltered');
325			return;
326			}
327
328			sub getListFiltered {
329			my $self = shift;
330			$self->_abstract_function('getListFiltered');
331			return;
332			}
333
334			sub sendQuery {
335			my $self = shift;
336			$self->_abstract_function('sendQuery');
337			return;
338			}
339
340			sub connect {
341			my $self = shift;
342			$self->_abstract_function('connect');
343			return;
344			}
345
346			sub testIntegrity {
347			my $self = shift;
348			$self->_abstract_function('testIntegrity');
349			return;
350			}
351
352			sub quoteSql {
353			my $self = shift;
354			$self->_abstract_function('quoteSql');
355	joko	1.4	return;
356			}
357
358			sub eraseAll {
359			my $self = shift;
360			$self->_abstract_function('eraseAll');
361			return;
362			}
363
364			sub createDb {
365			my $self = shift;
366			$self->_abstract_function('createDb');
367	joko	1.3	return;
368			}
369
370			1;
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