Storage/Handler/DBI.pm

#################################
#
#  $Id: DBI.pm,v 1.6 2002/12/01 04:46:01 joko Exp $
#
#  $Log: DBI.pm,v $
#  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" );

  # 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()" );
  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;
  #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;
  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);
}

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