Storage/Handler/DBI.pm

#################################
#
#  $Id: DBI.pm,v 1.7 2002/12/01 07:09:09 joko Exp $
#
#  $Log: DBI.pm,v $
#  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()" );
  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;
  
}

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