Storage/Handler/DBI.pm

#################################
#
#  $Id: DBI.pm,v 1.10 2002/12/15 02:02:22 joko Exp $
#
#  $Log: DBI.pm,v $
#  Revision 1.10  2002/12/15 02:02:22  joko
#  + fixed logging-message
#
#  Revision 1.9  2002/12/05 07:58:20  joko
#  + now using Tie::SecureHash as a base for the COREHANDLE
#  + former public COREHANDLE becomes private _COREHANDLE now
#
#  Revision 1.8  2002/12/01 22:20:43  joko
#  + sub createDb (from Storage.pm)
#
#  Revision 1.7  2002/12/01 07:09:09  joko
#  + sub getListFiltered (dummy redirecting to getListUnfiltered)
#
#  Revision 1.6  2002/12/01 04:46:01  joko
#  + sub eraseAll
#
#  Revision 1.5  2002/11/29 05:00:26  joko
#  + sub getListUnfiltered
#  + sub sendQuery
#
#  Revision 1.4  2002/11/17 08:46:42  jonen
#  + wrapped eval around DBI->connect to prevent deaths
#
#  Revision 1.3  2002/11/17 06:34:39  joko
#  + locator metadata can now be reached via ->{locator}
#  - sub hash2sql now taken from libdb
#
#  Revision 1.2  2002/10/25 11:43:27  joko
#  + enhanced robustness
#  + more logging for debug-levels
#
#  Revision 1.1  2002/10/10 03:44:07  cvsjoko
#  + new
#
#
#################################

package Data::Storage::Handler::DBI;

use strict;
use warnings;

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

use DBI;
use Data::Dumper;
use libdb qw( getDbNameByDsn hash2Sql );
use Data::Storage::Result::DBI;

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


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

sub connect {

    my $self = shift;
    
    # create handle
      if ( my $dsn = $self->{locator}->{dbi}->{dsn} ) {
      #if ( my $dsn = $self->{locator}->{dsn} ) {
        $logger->debug( __PACKAGE__ . "->connect( dsn $dsn )" );
        
        # HACK:
        # set errorhandler before actually calling DBI->connect 
        # in order to catch errors from the very beginning
        #DBI->{HandleError} = $self->{dbi}->{HandleError};
        
        #use Data::Dumper; print Dumper($self->{dbi});
        
        eval {
          $self->{_COREHANDLE} = DBI->connect( $dsn, '', '', $self->{locator}->{dbi} );
          if (!$self->{_COREHANDLE}) {
            $logger->warning( __PACKAGE__ . "->connect failed: " . DBI::errstr );
            return;
          }
        };
        $logger->warning( __PACKAGE__ . "->connect failed: " . $@ ) if $@;

      }
      $self->configureCOREHANDLE();

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

    return 1;
    
}

sub configureCOREHANDLE {

  my $self = shift;

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

  return if !$self->{_COREHANDLE};

  # apply configured modifications to DBI-handle
    if (exists $self->{locator}->{dbi}->{trace_level} && exists $self->{locator}->{dbi}->{trace_file}) {
      $self->{_COREHANDLE}->trace($self->{locator}->{dbi}->{trace_level}, $self->{locator}->{dbi}->{trace_file});
    }
    if (exists $self->{locator}->{dbi}->{RaiseError}) {
      $self->{_COREHANDLE}->{RaiseError} = $self->{locator}->{dbi}->{RaiseError};
    }
    if (exists $self->{locator}->{dbi}->{PrintError}) {
      $self->{_COREHANDLE}->{PrintError} = $self->{locator}->{dbi}->{PrintError};
    }
    if (exists $self->{locator}->{dbi}->{HandleError}) {
      $self->{_COREHANDLE}->{HandleError} = $self->{locator}->{dbi}->{HandleError};
    }

}

sub _sendSql {
  my $self = shift;
  my $sql = shift;
  
  # two-level handling for implicit connect:
  # if there's no corehandle ...
  if (!$self->{_COREHANDLE}) {
    # ... try to connect, but ...
    $self->connect();
    # ... if this still fails, there's something wrong probably, so we won't continue
    if (!$self->{_COREHANDLE}) {
      return;
    }
  }
  
  #print "prepare sql: $sql\n";
  
  my $sth = $self->{_COREHANDLE}->prepare($sql);
  $sth->execute();
  return $sth;
}

sub sendCommand {
  my $self = shift;
  my $command = shift;
  # TODO: when tracing: yes, do actually log this
  #$logger->debug( __PACKAGE__ . "->sendCommand( command $command )" );
  my $cmdHandle = $self->_sendSql($command);
  my $result = Data::Storage::Result::DBI->new( RESULTHANDLE => $cmdHandle );
  return $result;
}

sub getChildNodes {
  my $self = shift;
  my @nodes;
  $logger->debug( __PACKAGE__ . "->getChildNodes()" );
  my $locator = $self->{locator};
  #print Dumper($locator); exit;
  if (my $result = $self->sendCommand( 'SHOW TABLES;' ) ) {
    my $dbname = getDbNameByDsn($self->{locator}->{dbi}->{dsn});
    my $key = "Tables_in_$dbname";
    while ( my $row = $result->getNextEntry() ) {
      push @nodes, $row->{$key};
    }
  }
  return \@nodes;
}

sub getListUnfiltered {
  my $self = shift;
  my $nodename = shift;
  my @list;
  $logger->debug( __PACKAGE__ . "->getListUnfiltered( nodename => '" . $nodename . "' )" );
  # get list of rows from rdbms by table name
  my $result = $self->sendCommand("SELECT * FROM $nodename");
  while ( my $row = $result->getNextEntry() ) {
    push @list, $row;
  }
  return \@list;
}

sub sendQuery {
  my $self = shift;
  my $query = shift;

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

  #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($sql);
  my @crits;
  foreach (@{$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);
}

sub eraseAll {
  my $self = shift;
  my $classname = shift;
  $logger->debug( __PACKAGE__ . "->eraseAll" );
  my $sql = "DELETE FROM $classname";
  $self->sendCommand($sql);
}

# TODO: actually implement the filtering functionality using $this->sendQuery
sub getListFiltered {
  my $self = shift;
  my $nodename = shift;
  return $self->getListUnfiltered($nodename);
}

# TODO: do this via a parametrized "$self->connect(<connect just to database server - don't select database>)"
sub createDb {
  
  my $self = shift;
  
  # get dsn from Data::Storage::Locator instance
  my $dsn = $self->{locator}->{dbi}->{dsn};

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

  # remove database setting from dsn-string
  $dsn =~ s/database=(.+?);//;
  
  # remember extracted database name to know what actually to create right now
  my $database_name = $1;

  # flag to indicate goodness
  my $ok;
  
  # connect to database server - don't select/use any specific database
  #if ( my $dbh = DBI->connect($dsn, '', '', { PrintError => 0 } ) ) {
  if ( my $dbh = DBI->connect($dsn, '', '', $self->{locator}->{dbi} ) ) {

    if ($database_name) {
      if ($dbh->do("CREATE DATABASE $database_name")) {
        $ok = 1;
      }
    }

    $dbh->disconnect();

  }
  
  return $ok;
  
}

sub getCOREHANDLE2 {
  my $self = shift;
  return $self->{_COREHANDLE};
}

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

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

  $dsn =~ s/database=(.+?);//;
  my $database_name = $1;

  my $ok;
  
  if ( my $dbh = DBI->connect($dsn, '', '', {
                                                      PrintError => 0,
                                                      } ) ) {
    if ($database_name) {
      if ($dbh->do("DROP DATABASE $database_name;")) {
        $ok = 1;
      }
    }

    $dbh->disconnect();

  }
  
  return $ok;
}

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

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

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

1;
1	cvsjoko	1.1	#################################
2			#
3	joko	1.11	# $Id: DBI.pm,v 1.10 2002/12/15 02:02:22 joko Exp $
4	joko	1.2	#
5			# $Log: DBI.pm,v $
6	joko	1.11	# Revision 1.10 2002/12/15 02:02:22 joko
7			# + fixed logging-message
8			#
9	joko	1.10	# Revision 1.9 2002/12/05 07:58:20 joko
10			# + now using Tie::SecureHash as a base for the COREHANDLE
11			# + former public COREHANDLE becomes private _COREHANDLE now
12			#
13	joko	1.9	# Revision 1.8 2002/12/01 22:20:43 joko
14			# + sub createDb (from Storage.pm)
15			#
16	joko	1.8	# Revision 1.7 2002/12/01 07:09:09 joko
17			# + sub getListFiltered (dummy redirecting to getListUnfiltered)
18			#
19	joko	1.7	# Revision 1.6 2002/12/01 04:46:01 joko
20			# + sub eraseAll
21			#
22	joko	1.6	# Revision 1.5 2002/11/29 05:00:26 joko
23			# + sub getListUnfiltered
24			# + sub sendQuery
25			#
26	joko	1.5	# Revision 1.4 2002/11/17 08:46:42 jonen
27			# + wrapped eval around DBI->connect to prevent deaths
28			#
29	jonen	1.4	# Revision 1.3 2002/11/17 06:34:39 joko
30			# + locator metadata can now be reached via ->{locator}
31			# - sub hash2sql now taken from libdb
32			#
33	joko	1.3	# Revision 1.2 2002/10/25 11:43:27 joko
34			# + enhanced robustness
35			# + more logging for debug-levels
36			#
37	joko	1.2	# Revision 1.1 2002/10/10 03:44:07 cvsjoko
38			# + new
39	cvsjoko	1.1	#
40			#
41			#################################
42
43			package Data::Storage::Handler::DBI;
44
45			use strict;
46			use warnings;
47
48			use base ("Data::Storage::Handler::Abstract");
49
50			use DBI;
51	joko	1.3	use Data::Dumper;
52	joko	1.5	use libdb qw( getDbNameByDsn hash2Sql );
53			use Data::Storage::Result::DBI;
54	cvsjoko	1.1
55			# get logger instance
56			my $logger = Log::Dispatch::Config->instance;
57
58
59	joko	1.5	sub getMetaInfo {
60			my $self = shift;
61			$logger->debug( __PACKAGE__ . "->getMetaInfo()" );
62			return {
63			'disconnectMethod' => 'disconnect',
64			};
65			}
66	cvsjoko	1.1
67			sub connect {
68
69			my $self = shift;
70
71			# create handle
72	joko	1.3	if ( my $dsn = $self->{locator}->{dbi}->{dsn} ) {
73			#if ( my $dsn = $self->{locator}->{dsn} ) {
74	joko	1.2	$logger->debug( __PACKAGE__ . "->connect( dsn $dsn )" );
75
76			# HACK:
77			# set errorhandler before actually calling DBI->connect
78			# in order to catch errors from the very beginning
79			#DBI->{HandleError} = $self->{dbi}->{HandleError};
80
81			#use Data::Dumper; print Dumper($self->{dbi});
82
83	jonen	1.4	eval {
84	joko	1.9	$self->{_COREHANDLE} = DBI->connect( $dsn, '', '', $self->{locator}->{dbi} );
85			if (!$self->{_COREHANDLE}) {
86	jonen	1.4	$logger->warning( __PACKAGE__ . "->connect failed: " . DBI::errstr );
87			return;
88			}
89			};
90			$logger->warning( __PACKAGE__ . "->connect failed: " . $@ ) if $@;
91
92	cvsjoko	1.1	}
93			$self->configureCOREHANDLE();
94	joko	1.3
95			$self->{locator}->{status}->{connected} = 1;
96
97	joko	1.2	return 1;
98
99	cvsjoko	1.1	}
100
101			sub configureCOREHANDLE {
102
103			my $self = shift;
104
105	joko	1.3	$logger->debug( __PACKAGE__ . "->configureCOREHANDLE" );
106	cvsjoko	1.1
107	joko	1.9	return if !$self->{_COREHANDLE};
108	joko	1.8
109	joko	1.5	# apply configured modifications to DBI-handle
110	joko	1.3	if (exists $self->{locator}->{dbi}->{trace_level} && exists $self->{locator}->{dbi}->{trace_file}) {
111	joko	1.9	$self->{_COREHANDLE}->trace($self->{locator}->{dbi}->{trace_level}, $self->{locator}->{dbi}->{trace_file});
112	cvsjoko	1.1	}
113	joko	1.3	if (exists $self->{locator}->{dbi}->{RaiseError}) {
114	joko	1.9	$self->{_COREHANDLE}->{RaiseError} = $self->{locator}->{dbi}->{RaiseError};
115	cvsjoko	1.1	}
116	joko	1.3	if (exists $self->{locator}->{dbi}->{PrintError}) {
117	joko	1.9	$self->{_COREHANDLE}->{PrintError} = $self->{locator}->{dbi}->{PrintError};
118	cvsjoko	1.1	}
119	joko	1.3	if (exists $self->{locator}->{dbi}->{HandleError}) {
120	joko	1.9	$self->{_COREHANDLE}->{HandleError} = $self->{locator}->{dbi}->{HandleError};
121	cvsjoko	1.1	}
122
123			}
124
125			sub _sendSql {
126			my $self = shift;
127			my $sql = shift;
128	joko	1.2
129			# two-level handling for implicit connect:
130			# if there's no corehandle ...
131	joko	1.9	if (!$self->{_COREHANDLE}) {
132	joko	1.2	# ... try to connect, but ...
133			$self->connect();
134			# ... if this still fails, there's something wrong probably, so we won't continue
135	joko	1.9	if (!$self->{_COREHANDLE}) {
136	joko	1.2	return;
137			}
138			}
139
140	joko	1.3	#print "prepare sql: $sql\n";
141
142	joko	1.9	my $sth = $self->{_COREHANDLE}->prepare($sql);
143	cvsjoko	1.1	$sth->execute();
144			return $sth;
145			}
146
147			sub sendCommand {
148			my $self = shift;
149			my $command = shift;
150	joko	1.5	# TODO: when tracing: yes, do actually log this
151	joko	1.2	#$logger->debug( __PACKAGE__ . "->sendCommand( command $command )" );
152	cvsjoko	1.1	my $cmdHandle = $self->_sendSql($command);
153			my $result = Data::Storage::Result::DBI->new( RESULTHANDLE => $cmdHandle );
154			return $result;
155			}
156
157			sub getChildNodes {
158			my $self = shift;
159			my @nodes;
160	joko	1.3	$logger->debug( __PACKAGE__ . "->getChildNodes()" );
161	joko	1.9	my $locator = $self->{locator};
162			#print Dumper($locator); exit;
163	cvsjoko	1.1	if (my $result = $self->sendCommand( 'SHOW TABLES;' ) ) {
164	joko	1.3	my $dbname = getDbNameByDsn($self->{locator}->{dbi}->{dsn});
165			my $key = "Tables_in_$dbname";
166	joko	1.5	while ( my $row = $result->getNextEntry() ) {
167	joko	1.3	push @nodes, $row->{$key};
168	cvsjoko	1.1	}
169			}
170			return \@nodes;
171			}
172
173	joko	1.5	sub getListUnfiltered {
174	cvsjoko	1.1	my $self = shift;
175	joko	1.5	my $nodename = shift;
176			my @list;
177			$logger->debug( __PACKAGE__ . "->getListUnfiltered( nodename => '" . $nodename . "' )" );
178			# get list of rows from rdbms by table name
179			my $result = $self->sendCommand("SELECT * FROM $nodename");
180			while ( my $row = $result->getNextEntry() ) {
181			push @list, $row;
182			}
183			return \@list;
184	cvsjoko	1.1	}
185
186	joko	1.5	sub sendQuery {
187	cvsjoko	1.1	my $self = shift;
188	joko	1.5	my $query = shift;
189	joko	1.10
190			$logger->debug( __PACKAGE__ . "->sendQuery" );
191
192	joko	1.5	#my $sql = "SELECT cs FROM $self->{metainfo}->{$descent}->{node} WHERE $self->{metainfo}->{$descent}->{IdentProvider}->{arg}='$self->{entry}->{source}->{ident}';";
193			#my $result = $self->{metainfo}->{$descent}->{storage}->sendCommand($sql);
194			my @crits;
195			foreach (@{$query->{criterias}}) {
196			my $op = '';
197			$op = '=' if lc $_->{op} eq 'eq';
198			push @crits, "$_->{key}$op'$_->{val}'";
199			}
200			my $subnodes = {};
201			map { $subnodes->{$_}++ } @{$query->{subnodes}};
202			# HACK: this is hardcoded ;( expand possibilities!
203			my $crit = join(' AND ', @crits);
204			my $sql = hash2Sql($query->{node}, $subnodes, 'SELECT', $crit);
205			return $self->sendCommand($sql);
206	joko	1.6	}
207
208			sub eraseAll {
209			my $self = shift;
210			my $classname = shift;
211	joko	1.10	$logger->debug( __PACKAGE__ . "->eraseAll" );
212	joko	1.6	my $sql = "DELETE FROM $classname";
213			$self->sendCommand($sql);
214	joko	1.7	}
215
216			# TODO: actually implement the filtering functionality using $this->sendQuery
217			sub getListFiltered {
218			my $self = shift;
219			my $nodename = shift;
220			return $self->getListUnfiltered($nodename);
221	joko	1.8	}
222
223			# TODO: do this via a parametrized "$self->connect(<connect just to database server - don't select database>)"
224			sub createDb {
225
226			my $self = shift;
227
228			# get dsn from Data::Storage::Locator instance
229			my $dsn = $self->{locator}->{dbi}->{dsn};
230
231			$logger->debug( __PACKAGE__ . "->createDb( dsn $dsn )" );
232
233			# remove database setting from dsn-string
234			$dsn =~ s/database=(.+?);//;
235
236			# remember extracted database name to know what actually to create right now
237			my $database_name = $1;
238
239			# flag to indicate goodness
240			my $ok;
241
242			# connect to database server - don't select/use any specific database
243			#if ( my $dbh = DBI->connect($dsn, '', '', { PrintError => 0 } ) ) {
244			if ( my $dbh = DBI->connect($dsn, '', '', $self->{locator}->{dbi} ) ) {
245
246			if ($database_name) {
247			if ($dbh->do("CREATE DATABASE $database_name")) {
248			$ok = 1;
249			}
250			}
251
252			$dbh->disconnect();
253
254			}
255
256			return $ok;
257
258	joko	1.9	}
259
260			sub getCOREHANDLE2 {
261			my $self = shift;
262			return $self->{_COREHANDLE};
263	joko	1.11	}
264
265			sub dropDb {
266			my $self = shift;
267			my $dsn = $self->{locator}->{dbi}->{dsn};
268
269			$logger->debug( __PACKAGE__ . "->dropDb( dsn $dsn )" );
270
271			$dsn =~ s/database=(.+?);//;
272			my $database_name = $1;
273
274			my $ok;
275
276			if ( my $dbh = DBI->connect($dsn, '', '', {
277			PrintError => 0,
278			} ) ) {
279			if ($database_name) {
280			if ($dbh->do("DROP DATABASE $database_name;")) {
281			$ok = 1;
282			}
283			}
284
285			$dbh->disconnect();
286
287			}
288
289			return $ok;
290			}
291
292			sub rebuildDb {
293			my $self = shift;
294			$logger->info( __PACKAGE__ . "->rebuildDb()" );
295			my @results;
296
297			# sum up results (bool (0/1)) in array
298			#push @results, $self->retreatSchema();
299			push @results, $self->dropDb();
300			push @results, $self->createDb();
301			#push @results, $self->deploySchema();
302
303			# scan array for "bad ones"
304			my $res = 1;
305			map {
306			$res = 0 if (!$_);
307			} @results;
308
309			return $res;
310	cvsjoko	1.1	}
311
312	jonen	1.4	1;
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