Storage/Handler/DBI.pm

#################################
#
#  $Id: DBI.pm,v 1.4 2002/11/17 08:46:42 jonen Exp $
#
#  $Log: DBI.pm,v $
#  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);
}

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