/[webpac]/trunk/index_DBI.pm
This is repository of my old source code which isn't updated any more. Go to git.rot13.org for current projects!
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Contents of /trunk/index_DBI.pm

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Revision 10 - (show annotations)
Thu Jan 16 17:35:54 2003 UTC (16 years, 10 months ago) by dpavlin
File size: 2717 byte(s)
bunch of changes: make design more modular, implement index (partial
implementation) and other small and big changes

1 #
2 # this file implements index functions using DBI
3 #
4
5 package index_DBI;
6 use strict qw(vars);
7 use vars qw($Count);
8
9 use DBI;
10
11 my %Table; # index tables which where visited in this run
12
13 sub new {
14 my $class = shift;
15 my $self = {};
16 bless($self, $class);
17
18 # FIX: config params
19 $self->{dbh} = DBI->connect("DBI:Pg:dbname=webpac","","") || die $DBI::errstr;
20 # begin transaction
21 $self->{dbh}->begin_work || die $self->{dbh}->errstr();
22
23 $Count++;
24
25 return $self;
26 }
27
28 sub delete_and_create {
29 my $self = shift;
30
31 my $field = shift;
32
33 $self->{dbh}->commit;
34 $self->{dbh}->begin_work;
35
36 my $sql = "select count(*) from $field";
37 my $sth = $self->{dbh}->prepare($sql) || die $self->{dbh}->errstr();
38 # FIX: this is not a good way to check if table exists!
39 if (1 || $sth->execute() && $sth->fetchrow_hashref) {
40 my $sql = "drop table $field";
41 # my $sth = $self->{dbh}->do($sql) || die "SQL: $sql ".$self->{dbh}->errstr();
42 }
43 $sql = "create table $field (
44 item varchar(255),
45 ident varchar(255),
46 count int,
47 primary key (item,ident)
48 )";
49 # $sth = $self->{dbh}->do($sql) || die "SQL: $sql ".$self->{dbh}->errstr();
50 $sth = $self->{dbh}->do($sql) || warn "SQL: $sql ".$self->{dbh}->errstr();
51
52 $self->{dbh}->commit;
53 $self->{dbh}->begin_work;
54 }
55
56 sub insert {
57 my $self = shift;
58
59 my $field = shift;
60 my $index_data = shift;
61 my $ident = shift; # e.g. Library ID
62
63 if (! $index_data) {
64 print STDERR "\$index->insert() -- no value to insert\n";
65 return;
66 }
67
68 if (! $Table{$field}) {
69 $self->delete_and_create($field);
70 }
71 $Table{$field}++;
72
73 my $sql = "select item from $field where upper(item)=upper(?)";
74 my $sth = $self->{dbh}->prepare($sql) || die $self->{dbh}->errstr();
75 $sth->execute($index_data) || die "SQL: $sql; ".$self->{dbh}->errstr();
76 if (! $sth->fetchrow_hashref) {
77 my $sql = "insert into $field (item,ident,count) values (?,?,?)";
78 my $sth = $self->{dbh}->prepare($sql) || die $self->{dbh}->errstr();
79 $sth->execute($index_data,$ident,1) || die "SQL: $sql; ".$self->{dbh}->errstr();
80 #print STDERR "in index: $index_data\n";
81 } else {
82 my $sql = "update $field set count = count + 1 where item = ? and ident = ?";
83 my $sth = $self->{dbh}->prepare($sql) || die $self->{dbh}->errstr();
84 $sth->execute($index_data,$ident) || die "SQL: $sql; ".$self->{dbh}->errstr();
85 }
86 }
87
88 sub close {
89 my $self = shift;
90
91 if ($self->{dbh}) {
92 $self->{dbh}->commit || die $self->{dbh}->errstr();
93 $self->{dbh}->disconnect;
94 undef $self->{dbh};
95 }
96 }
97
98 END {
99 $Count--;
100 print STDERR "index_DBI fatal error: \$index->close() not called... $Count references left!\n" if ($Count != 0);
101 # FIX: debug output
102 print STDERR "usage\ttable\n";
103 foreach (keys %Table) {
104 print STDERR $Table{$_},"\t$_\n";
105 }
106 }
107
108 1;

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