/[webpac]/trunk2/lib/WebPAC/Index.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 /trunk2/lib/WebPAC/Index.pm

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Revision 354 - (show annotations)
Wed Jun 16 11:31:42 2004 UTC (16 years, 3 months ago) by dpavlin
File size: 6279 byte(s)
WebPac -> WebPAC

1 #
2 # this file implements index functions using DBI
3 # and huge amounts of memory for cache speedup
4 #
5 # this version doesn't support ident (which sould be location in
6 # library). But, that functionality is not used anyway...
7 #
8
9 package WebPAC::Index;
10 use strict qw(vars);
11 use vars qw($Count);
12 use HTML::Entities;
13 use URI::Escape;
14 use locale;
15 use Carp;
16
17 use DBI;
18
19 my %Table; # index tables which where visited in this run
20 my %sth_cache; # cache prepared statements
21
22 # cache var
23 my $c_table;
24 my $c_count;
25
26 # bench time
27 my $bench_time = time();
28
29 sub bench {
30 my $self = shift;
31 my $msg = shift;
32
33 print STDERR "last operation took ",time()-$bench_time," seconds...\n";
34 $bench_time=time();
35 print STDERR "$msg\n";
36 }
37
38 sub new {
39 my $class = shift;
40 my $self = {@_};
41 bless($self, $class);
42
43 croak "need dbd" if (! $self->{dbd});
44 croak "need dsn" if (! $self->{dsn});
45 croak "need user" if (! $self->{user});
46 croak "need passwd" if (! $self->{passwd});
47
48 $self->{dbh} = DBI->connect("DBI:$self->{dbd}:$self->{dsn}",$self->{user},$self->{passwd}) || die $DBI::errstr;
49 $Count++;
50
51 $self->bench("connected to $self->{dbd} as $self->{user}");
52
53 # force SQLite to support binary 0 in data (which shouldn't
54 # happend, but it did to me)
55 eval {
56 no warnings 'all';
57 $self->{dbh}->{sqlite_handle_binary_nulls} = 1;
58 };
59
60 return $self;
61 }
62
63 sub delete_and_create {
64 my $self = shift;
65
66 my $field = shift;
67
68 #print "#### delete_and_create($field)\n";
69
70 my $sql = "select count(*) from $field";
71 my $sth = $self->{dbh}->prepare($sql) || die $self->{dbh}->errstr();
72 # FIX: this is not a good way to check if table exists!
73 if ($sth->execute() && $sth->fetchrow_hashref) {
74 my $sql = "drop table $field";
75 my $sth = $self->{dbh}->do($sql) || warn "SQL: $sql - ".$sth->errstr();
76 }
77 $sql = "create table $field (
78 item varchar(255),
79 display text,
80 count int,
81 ord int,
82 primary key (item)
83 )";
84
85 $sth = $self->{dbh}->do($sql) || warn "SQL: $sql ".$self->{dbh}->errstr();
86 }
87
88 sub insert {
89 my $self = shift;
90
91 my $field = shift;
92 my $index_data = shift || print STDERR "\$index->insert($field,NULL,...)";
93 my $display = shift || $index_data;
94
95 if (! $index_data) {
96 print STDERR "\$index->insert() -- no value to insert\n";
97 return;
98 }
99
100 $Table{$field}++;
101
102 #$sth_cache{$field."select"}->execute($index_data) || die "cache: $field select; ".$self->{dbh}->errstr();
103
104 # XXX for some strange reason, it seems that some entries in my
105 # database produce strings which start with null byte. I suspect
106 # this to be bug in OpenIsis 0.9.0.
107 # This should fix it..
108 $index_data =~ s/^[^\w]+//;
109 $index_data = substr($index_data,0,255);
110
111 my $uc = uc($index_data);
112 if (! $c_table->{$field}->{$uc}) {
113 #print stderr "in index: $index_data\n";
114 $c_table->{$field}->{$uc} = $index_data;
115 $c_table->{$field}->{$uc}->{display} = $display;
116 $c_count->{$field}->{$uc} = 1;
117 } else {
118 $c_count->{$field}->{$uc}++;
119 }
120 }
121
122 sub count {
123 my $self = shift;
124
125 my $field = shift;
126 my $where = shift;
127
128 my $sql = "select count(*) from $field where upper(item) like upper(?)||'%'";
129
130 my $sth = $self->{dbh}->prepare($sql) || die $self->{dbh}->errstr();
131 $sth->execute($where) || die "sql: $sql; ".$self->{dbh}->errstr();
132
133 my ($total) = $sth->fetchrow_array();
134
135 # no results, count all
136 if (! $total) {
137 my $sql = "select count(*) from $field";
138
139 my $sth = $self->{dbh}->prepare($sql) || die $self->{dbh}->errstr();
140 $sth->execute() || die "sql: $sql; ".$self->{dbh}->errstr();
141 $total = $sth->fetchrow_array();
142
143 }
144
145 return $total || 1;
146 }
147
148
149 sub fetch {
150 my $self = shift;
151
152 my $field = shift;
153 my $where = shift;
154
155 my $from_ord = shift || 0;
156 my $rows = shift || 10;
157
158 my @sql_args;
159
160 my $sql = "select item,display,ord from $field";
161
162 if ($where) {
163 my $sql2 = "select ord from $field where upper(item) like upper(?)||'%'";
164 my $sth = $self->{dbh}->prepare($sql2) || die "sql2: $sql2; ".$self->{dbh}->errstr();
165
166 $sth->execute($where) || die "sql2: $sql2; ".$self->{dbh}->errstr();
167 if (my $row = $sth->fetchrow_hashref) {
168 $from_ord += $row->{ord} - 1;
169 } else {
170 # if no match is found when searching from beginning
171 # of word in index, try substring match anywhere
172 $sql2 = "select ord from $field where upper(item) like '% '||upper(?)||'%'";
173 $sth = $self->{dbh}->prepare($sql2) || die "sql2: $sql2; ".$self->{dbh}->errstr();
174 $sth->execute($where) || die "sql2: $sql2; ".$self->{dbh}->errstr();
175 if (my $row = $sth->fetchrow_hashref) {
176 $from_ord += $row->{ord} - 1;
177 }
178 }
179 }
180 $sql .= " order by ord limit $rows offset $from_ord";
181
182 my $sth = $self->{dbh}->prepare($sql) || die "prepare: $sql; ".$self->{dbh}->errstr();
183 $sth->execute() || die "execute: $sql; ".$self->{dbh}->errstr();
184 my @arr;
185 while (my $row = $sth->fetchrow_hashref) {
186 $row->{item} = HTML::Entities::encode($row->{item},' <>&"');
187 $row->{display} = HTML::Entities::encode($row->{display},'<>&"');
188 push @arr,$row;
189 }
190 return @arr;
191 }
192
193 sub close {
194 my $self = shift;
195
196 return if (! $self->{dbh});
197
198 foreach my $table (keys %Table) {
199 $self->bench("Crating table $table");
200 $self->delete_and_create($table);
201
202 $self->{dbh}->begin_work || die $self->{dbh}->errstr();
203
204 $self->bench("Sorting ".$Table{$table}." (with duplicates) items in $table");
205 my @keys = sort keys %{$c_table->{$table}};
206
207 $self->bench("Dumping ".($#keys+1)." items into $table");
208 my $sql = "insert into $table (ord,item,display,count) values (?,?,?,?)";
209 my $sth = $self->{dbh}->prepare($sql) || die "sql: $sql; ".$self->{dbh}->errstr();
210
211 my $ord = 0;
212 foreach my $key (@keys) {
213 $sth->execute(++$ord,
214 $c_table->{$table}->{$key},
215 $c_table->{$table}->{$key}->{display},
216 $c_count->{$table}->{$key}
217 );
218 }
219
220 $self->{dbh}->commit || die $self->{dbh}->errstr();
221 }
222
223 if ($self->{dbd} =~ m/(Pg|SQLite)/) {
224 $self->{dbh}->do(qq{vacuum}) || warn "vacumming failed. It shouldn't if you are using PostgreSQL or SQLite: ".$self->{dbh}->errstr();
225 }
226
227 $self->bench("disconnecting from database");
228
229 $self->{dbh}->disconnect;
230 undef $self->{dbh};
231 }
232
233 END {
234 $Count--;
235 print STDERR "index_DBI fatal error: \$index->close() not called... $Count references left!\n" if ($Count > 0);
236 # FIX: debug output
237 # print STDERR "usage\ttable\n";
238 # foreach (keys %Table) {
239 # print STDERR $Table{$_},"\t$_\n";
240 # }
241 }
242
243 1;

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