/[webpac]/trunk/index_DBI_filter.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_filter.pm

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Revision 642 - (show annotations)
Sun Jan 23 14:31:02 2005 UTC (15 years, 4 months ago) by dpavlin
File size: 7261 byte(s)
renamed tag to finger to avoid confusion (I tried to exmplain why I use term
tag and failed -- it too similar to tags used in import_xml)

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 index_DBI;
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 # bench time
20 my $bench_time = time();
21
22 my $debug = 1;
23
24 sub bench {
25 my $self = shift;
26 my $msg = shift;
27
28 print STDERR "last operation took ",time()-$bench_time," seconds...\n";
29 $bench_time=time();
30 print STDERR "$msg\n";
31 }
32
33 sub new {
34 my $class = shift;
35 my $self = {};
36 bless($self, $class);
37
38 my $dbd = shift || die "need dbi_dbd= in [global] section of configuration file";
39 my $dsn = shift || die "need dbi_dsn= in [global] section of configuration file";
40 my $user = shift || die "need dbi_user= in [global] section of configuration file";
41 my $passwd = shift || die "need dbi_passwd= in [global] section of configuration file";
42
43 $self->{dbd} = $dbd;
44
45 $self->{dbh} = DBI->connect("DBI:$dbd:$dsn",$user,$passwd) || die $DBI::errstr;
46 $Count++;
47
48 $self->bench("connected to $dbd as $user");
49
50 # force SQLite to support binary 0 in data (which shouldn't
51 # happend, but it did to me)
52 eval {
53 no warnings 'all';
54 $self->{dbh}->{sqlite_handle_binary_nulls} = 1;
55 };
56
57 return $self;
58 }
59
60 sub delete_and_create {
61 my $self = shift;
62
63 my $index = shift || croak "need index name!";
64 my $sql = shift || croak "need sql to create table!";
65
66 print STDERR "## delete_and_create($index)\n" if ($debug);
67
68 my $sql_delete = "delete from $index";
69 my $sth = $self->{dbh}->prepare($sql_delete) || confess "can't prepare: $sql_delete";
70
71 if ($sth->execute()) {
72 print STDERR "## deleted rows from table $index\n" if ($debug);
73 } else {
74 # can't delete from table, assume it doesn't exists!
75 $self->{dbh}->rollback;
76 $self->{dbh}->do($sql) || confess "SQL: $sql ".$self->{dbh}->errstr();
77 print STDERR "## creating table $index\n" if ($debug);
78 $self->{dbh}->begin_work;
79 }
80 }
81
82 sub insert {
83 my $self = shift;
84
85 my $field = shift;
86 my $index_data = shift || print STDERR "\$index->insert($field,NULL,...)";
87 my $display = shift || $index_data;
88 my $filter = shift;
89
90 if (! $index_data) {
91 print STDERR "\$index->insert() -- no value to insert\n";
92 return;
93 }
94
95 $index_data =~ s#&(\w)(acute|cedil|circ|grave|ring|slash|tilde|uml);#$1#gi;
96
97 # strip spaces
98 $index_data =~ s#^\s+##;
99 $index_data =~ s#\s+$##;
100 $index_data =~ s#\s\s+# #g;
101
102 my $uc = uc($index_data);
103
104 if (! $self->{c}->{$uc}->{$field}) {
105 #print stderr "in index: $index_data\n";
106 $self->{c}->{$uc}->{$field}->{item} = $index_data;
107 $self->{c}->{$uc}->{$field}->{display} = $display;
108 }
109
110 $self->{c}->{$uc}->{$field}->{count}++;
111 $self->{c}->{$uc}->{$field}->{filter}->{$filter}++ if ($filter);
112 }
113
114 sub count {
115 my $self = shift;
116
117 my $field = shift;
118 my $where = shift;
119
120 my $sql = "select count(*) from index where name = ? and upper(item) like upper(?)||'%'";
121
122 my $sth = $self->{dbh}->prepare($sql) || die $self->{dbh}->errstr();
123 $sth->execute($field,$where) || die "sql: $sql; ".$self->{dbh}->errstr();
124
125 my ($total) = $sth->fetchrow_array();
126
127 # no results, count all
128 if (! $total) {
129 my $sql = "select count(*) from index wheere name = ?";
130
131 my $sth = $self->{dbh}->prepare($sql) || die $self->{dbh}->errstr();
132 $sth->execute($field) || die "sql: $sql; ".$self->{dbh}->errstr();
133 $total = $sth->fetchrow_array();
134
135 }
136
137 return $total || 1;
138 }
139
140
141 sub fetch {
142 my $self = shift;
143
144 my $field = shift;
145 my $where = shift;
146
147 my $offset = shift || 0;
148 my $rows = shift || 10;
149 my $from_ord = 0;
150
151 my @sql_args;
152
153 my $sql = qq{
154 select item,display,count
155 from index
156 where name = ?
157 and ord > ?
158 order by ord
159 limit ? offset ?
160 };
161
162 if ($where) {
163 my $sql2 = "select ord from index where name = ? and upper(item) like upper(?)||'%'";
164 my $sth = $self->{dbh}->prepare($sql2) || die "sql2: $sql2; ".$self->{dbh}->errstr();
165
166 $sth->execute($field, $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 index where name = ? and upper(item) like '% '||upper(?)||'%'";
173 $sth = $self->{dbh}->prepare($sql2) || die "sql2: $sql2; ".$self->{dbh}->errstr();
174 $sth->execute($field, $where) || die "sql2: $sql2; ".$self->{dbh}->errstr();
175 if (my $row = $sth->fetchrow_hashref) {
176 $from_ord += $row->{ord} - 1;
177 }
178 }
179 }
180
181 my $sth = $self->{dbh}->prepare($sql) || die "prepare: $sql; ".$self->{dbh}->errstr();
182 $sth->execute($field,$from_ord,$rows,$offset) || die "execute: $sql; ".$self->{dbh}->errstr();
183 my @arr;
184 while (my $row = $sth->fetchrow_hashref) {
185 $row->{item} = HTML::Entities::encode($row->{item},' <>&"');
186 $row->{display} = HTML::Entities::encode($row->{display},'<>&"');
187 $row->{item} =~ s#&amp;(\w)(acute|cedil|circ|grave|ring|slash|tilde|uml);#$1#gi;
188 $row->{display} =~ s#&amp;(\w)(acute|cedil|circ|grave|ring|slash|tilde|uml);#&$1$2;#gi;
189 push @arr,$row;
190 }
191 return @arr;
192 }
193
194 sub close {
195 my $self = shift;
196
197 return if (! $self->{dbh});
198
199 $self->{dbh}->begin_work || die $self->{dbh}->errstr();
200
201 $self->delete_and_create('index', qq{
202 create table index (
203 name varchar(255),
204 ord int,
205 item text,
206 display text,
207 count int,
208 primary key (name,ord)
209 );
210 });
211
212 $self->delete_and_create('filters', qq{
213 create table filters (
214 filter varchar(255),
215 ord int,
216 count int,
217 primary key (filter,ord)
218 );
219 });
220
221 $self->bench("getting all entries");
222 my @items = keys %{$self->{c}};
223 $self->bench("got ".($#items+1)." items, now sorting");
224 @items = sort @items;
225
226 my $sql = "insert into index (name,ord,item,display,count) values (?,?,?,?,?)";
227 my $sth_index = $self->{dbh}->prepare($sql) || confess "$sql: ".$self->{dbh}->errstr();
228
229 $sql = "insert into filters (filter, ord, count) values (?,?,?)";
230 my $sth_filter = $self->{dbh}->prepare($sql) || confess "$sql: ".$self->{dbh}->errstr();
231
232 my $ord = 0;
233 foreach my $key (@items) {
234
235 foreach my $field (keys %{$self->{c}->{$key}}) {
236 # store items
237 $sth_index->execute(
238 $field,
239 ++$ord,
240 $self->{c}->{$key}->{$field}->{item},
241 $self->{c}->{$key}->{$field}->{display},
242 $self->{c}->{$key}->{$field}->{count},
243 );
244
245 # store filters
246 next unless ($self->{c}->{$key}->{$field}->{filter});
247
248 foreach my $filter (keys %{$self->{c}->{$key}->{$field}->{filter}}) {
249 $sth_filter->execute( $filter, $ord, $self->{c}->{$key}->{$field}->{filter}->{$filter} );
250 }
251 }
252
253
254 }
255
256 $self->{dbh}->commit || die $self->{dbh}->errstr();
257
258 $self->bench("vacuuming");
259
260 if ($self->{dbd} =~ m/(Pg|SQLite)/) {
261 $self->{dbh}->do(qq{vacuum}) || carp "vacumming failed. It shouldn't if you are using PostgreSQL or SQLite: ".$self->{dbh}->errstr();
262 }
263
264 $self->bench("disconnecting from database");
265
266 $self->{dbh}->disconnect;
267 undef $self->{dbh};
268 }
269
270 END {
271 $Count--;
272 print STDERR "index_DBI fatal error: \$index->close() not called... $Count references left!\n" if ($Count > 0);
273 # FIX: debug output
274 # print STDERR "usage\ttable\n";
275 # foreach (keys %Table) {
276 # print STDERR $Table{$_},"\t$_\n";
277 # }
278 }
279
280 1;

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