Storage/Handler/DBI.pm

#################################
#
#  $Id: DBI.pm,v 1.5 2002/11/29 05:00:26 joko Exp $
#
#  $Log: DBI.pm,v $
#  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);
}

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