Storage/Handler/DBI.pm

#################################
#
#  $Id: DBI.pm,v 1.8 2002/12/01 22:20:43 joko Exp $
#
#  $Log: DBI.pm,v $
#  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;
  #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);
}

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