Storage/Handler/DBI.pm

#################################
#
#  $Id: DBI.pm,v 1.9 2002/12/05 07:58:20 joko Exp $
#
#  $Log: DBI.pm,v $
#  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};
}

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