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	#################################
2	#
3	# $Id: DBI.pm,v 1.8 2002/12/01 22:20:43 joko Exp $
4	#
5	# $Log: DBI.pm,v $
6	# Revision 1.8 2002/12/01 22:20:43 joko
7	# + sub createDb (from Storage.pm)
8	#
9	# Revision 1.7 2002/12/01 07:09:09 joko
10	# + sub getListFiltered (dummy redirecting to getListUnfiltered)
11	#
12	# Revision 1.6 2002/12/01 04:46:01 joko
13	# + sub eraseAll
14	#
15	# Revision 1.5 2002/11/29 05:00:26 joko
16	# + sub getListUnfiltered
17	# + sub sendQuery
18	#
19	# Revision 1.4 2002/11/17 08:46:42 jonen
20	# + wrapped eval around DBI->connect to prevent deaths
21	#
22	# 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	# Revision 1.2 2002/10/25 11:43:27 joko
27	# + enhanced robustness
28	# + more logging for debug-levels
29	#
30	# Revision 1.1 2002/10/10 03:44:07 cvsjoko
31	# + new
32	#
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	use Data::Dumper;
45	use libdb qw( getDbNameByDsn hash2Sql );
46	use Data::Storage::Result::DBI;
47
48	# get logger instance
49	my $logger = Log::Dispatch::Config->instance;
50
51
52	sub getMetaInfo {
53	my $self = shift;
54	$logger->debug( __PACKAGE__ . "->getMetaInfo()" );
55	return {
56	'disconnectMethod' => 'disconnect',
57	};
58	}
59
60	sub connect {
61
62	my $self = shift;
63
64	# create handle
65	if ( my $dsn = $self->{locator}->{dbi}->{dsn} ) {
66	#if ( my $dsn = $self->{locator}->{dsn} ) {
67	$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	eval {
77	$self->{_COREHANDLE} = DBI->connect( $dsn, '', '', $self->{locator}->{dbi} );
78	if (!$self->{_COREHANDLE}) {
79	$logger->warning( __PACKAGE__ . "->connect failed: " . DBI::errstr );
80	return;
81	}
82	};
83	$logger->warning( __PACKAGE__ . "->connect failed: " . $@ ) if $@;
84
85	}
86	$self->configureCOREHANDLE();
87
88	$self->{locator}->{status}->{connected} = 1;
89
90	return 1;
91
92	}
93
94	sub configureCOREHANDLE {
95
96	my $self = shift;
97
98	$logger->debug( __PACKAGE__ . "->configureCOREHANDLE" );
99
100	return if !$self->{_COREHANDLE};
101
102	# apply configured modifications to DBI-handle
103	if (exists $self->{locator}->{dbi}->{trace_level} && exists $self->{locator}->{dbi}->{trace_file}) {
104	$self->{_COREHANDLE}->trace($self->{locator}->{dbi}->{trace_level}, $self->{locator}->{dbi}->{trace_file});
105	}
106	if (exists $self->{locator}->{dbi}->{RaiseError}) {
107	$self->{_COREHANDLE}->{RaiseError} = $self->{locator}->{dbi}->{RaiseError};
108	}
109	if (exists $self->{locator}->{dbi}->{PrintError}) {
110	$self->{_COREHANDLE}->{PrintError} = $self->{locator}->{dbi}->{PrintError};
111	}
112	if (exists $self->{locator}->{dbi}->{HandleError}) {
113	$self->{_COREHANDLE}->{HandleError} = $self->{locator}->{dbi}->{HandleError};
114	}
115
116	}
117
118	sub _sendSql {
119	my $self = shift;
120	my $sql = shift;
121
122	# two-level handling for implicit connect:
123	# if there's no corehandle ...
124	if (!$self->{_COREHANDLE}) {
125	# ... try to connect, but ...
126	$self->connect();
127	# ... if this still fails, there's something wrong probably, so we won't continue
128	if (!$self->{_COREHANDLE}) {
129	return;
130	}
131	}
132
133	#print "prepare sql: $sql\n";
134
135	my $sth = $self->{_COREHANDLE}->prepare($sql);
136	$sth->execute();
137	return $sth;
138	}
139
140	sub sendCommand {
141	my $self = shift;
142	my $command = shift;
143	# TODO: when tracing: yes, do actually log this
144	#$logger->debug( __PACKAGE__ . "->sendCommand( command $command )" );
145	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	$logger->debug( __PACKAGE__ . "->getChildNodes()" );
154	my $locator = $self->{locator};
155	#print Dumper($locator); exit;
156	if (my $result = $self->sendCommand( 'SHOW TABLES;' ) ) {
157	my $dbname = getDbNameByDsn($self->{locator}->{dbi}->{dsn});
158	my $key = "Tables_in_$dbname";
159	while ( my $row = $result->getNextEntry() ) {
160	push @nodes, $row->{$key};
161	}
162	}
163	return \@nodes;
164	}
165
166	sub getListUnfiltered {
167	my $self = shift;
168	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	}
178
179	sub sendQuery {
180	my $self = shift;
181	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	}
197
198	sub eraseAll {
199	my $self = shift;
200	my $classname = shift;
201	my $sql = "DELETE FROM $classname";
202	$self->sendCommand($sql);
203	}
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	}
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	}
248
249	sub getCOREHANDLE2 {
250	my $self = shift;
251	return $self->{_COREHANDLE};
252	}
253
254	1;
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