/[webpac]/branches/tehnika/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 /branches/tehnika/index_DBI_filter.pm

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Revision 697 - (show annotations)
Sun Mar 13 02:03:30 2005 UTC (15 years, 8 months ago) by dpavlin
File size: 8283 byte(s)
updated branches to head

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 Carp;
15 use DBI;
16 use locale;
17
18 # bench time
19 my $bench_time = time();
20
21 my $debug = 1;
22
23 sub bench {
24 my $self = shift;
25 my $msg = shift;
26
27 print STDERR "last operation took ",time()-$bench_time," seconds...\n";
28 $bench_time=time();
29 print STDERR "$msg\n";
30 }
31
32 sub new {
33 my $class = shift;
34 my $self = {};
35 bless($self, $class);
36
37 my $dbd = shift || die "need dbi_dbd= in [global] section of configuration file";
38 my $dsn = shift || die "need dbi_dsn= in [global] section of configuration file";
39 my $user = shift || die "need dbi_user= in [global] section of configuration file";
40 my $passwd = shift || die "need dbi_passwd= in [global] section of configuration file";
41
42 $self->{dbd} = $dbd;
43
44 $self->{dbh} = DBI->connect("DBI:$dbd:$dsn",$user,$passwd) || die $DBI::errstr;
45 $Count++;
46
47 $self->bench("connected to $dbd as $user");
48
49 # force SQLite to support binary 0 in data (which shouldn't
50 # happend, but it did to me)
51 eval {
52 no warnings 'all';
53 $self->{dbh}->{sqlite_handle_binary_nulls} = 1;
54 };
55
56 return $self;
57 }
58
59 sub delete_and_create {
60 my $self = shift;
61
62 my $table = shift || croak "need table name!";
63 my $sql = shift || croak "need sql to create table!";
64
65 print STDERR "## delete_and_create($table)\n" if ($debug);
66
67 my $sql_delete = "delete from $table";
68 my $sth = $self->{dbh}->prepare($sql_delete);
69
70 if ($sth && $sth->execute()) {
71 print STDERR "## deleted rows from table $table\n" if ($debug);
72 } else {
73 # can't delete from table, assume it doesn't exists!
74 $self->{dbh}->rollback;
75 $self->{dbh}->do($sql) || confess "SQL: $sql ".$self->{dbh}->errstr();
76 print STDERR "## creating table $table\n" if ($debug);
77 $self->{dbh}->begin_work;
78 }
79 }
80
81 sub insert {
82 my $self = shift;
83
84 my $field = shift;
85 my $index_data = shift || print STDERR "\$index->insert($field,NULL,...)";
86 my $display = shift || $index_data;
87 my $filter = shift;
88
89 if (! $index_data) {
90 print STDERR "\$index->insert() -- no value to insert\n";
91 return;
92 }
93
94 $index_data =~ s#&(\w)(acute|cedil|circ|grave|ring|slash|tilde|uml);#$1#gi;
95
96 # strip spaces
97 $index_data =~ s#^\s+##;
98 $index_data =~ s#\s+$##;
99 $index_data =~ s#\s\s+# #g;
100
101 my $uc = uc($index_data);
102
103 if (! $self->{c}->{$uc}->{$field}) {
104 #print stderr "in index: $index_data\n";
105 $self->{c}->{$uc}->{$field}->{item} = lc($index_data);
106 $self->{c}->{$uc}->{$field}->{display} = $display;
107 }
108
109 $self->{c}->{$uc}->{$field}->{count}++;
110 $self->{c}->{$uc}->{$field}->{filter}->{$filter}++ if ($filter);
111 }
112
113 sub count {
114 my $self = shift;
115
116 my $field = shift;
117 my $where = shift;
118
119 my $filter = shift;
120
121 my $tables_sql = 'data';
122 my $where_sql = '';
123 my @sql_args = ( $field, lc($where) );
124
125 if ($filter) {
126 $tables_sql .= ",filters";
127 $where_sql .= "
128 and data.ord = filters.ord
129 and filter = ?
130 ";
131 push @sql_args, $filter;
132 }
133
134 my $sql = qq{
135 select count(*)
136 from $tables_sql
137 where name = ? and item like ?||'%'
138 $where_sql
139 };
140
141 my $sth = $self->{dbh}->prepare($sql) || confess $self->{dbh}->errstr();
142 $sth->execute(@sql_args) || confess "sql: $sql; ".$self->{dbh}->errstr();
143
144 my ($total) = $sth->fetchrow_array();
145
146 # no results, count all
147 if (! $total) {
148 my $sql = qq{
149 select count(*)
150 from $tables_sql
151 where data.name = ?
152 $where_sql
153 };
154
155 @sql_args = ( $field );
156 push @sql_args, $filter if ($filter);
157
158 my $sth = $self->{dbh}->prepare($sql) || confess $self->{dbh}->errstr();
159 $sth->execute(@sql_args) || confess "sql: $sql; ".$self->{dbh}->errstr();
160 $total = $sth->fetchrow_array();
161
162 }
163
164 return $total || '0';
165 }
166
167
168 sub fetch {
169 my $self = shift;
170
171 my $field = shift;
172 my $where = shift;
173
174 my $offset = shift || 0;
175 my $rows = shift || 10;
176 my $filter = shift;
177
178 my $from_ord = 0;
179
180 my $tables_sql = 'data';
181 my $where_sql = '';
182
183 my @sql_args = ( $field, lc($where) );
184
185 if ($filter) {
186 $tables_sql .= ",filters";
187 $where_sql .= "
188 and data.ord = filters.ord
189 and filter = ?
190 ";
191 push @sql_args, $filter;
192 }
193
194 if ($where) {
195 my $sql2 = qq{
196 select data.ord as ord
197 from $tables_sql
198 where name = ? and item like ?||'%'
199 $where_sql
200 order by data.ord
201 };
202 my $sth = $self->{dbh}->prepare($sql2) || confess "sql2: $sql2; ".$self->{dbh}->errstr();
203
204 $sth->execute(@sql_args) || confess "sql2: $sql2; ".$self->{dbh}->errstr();
205 if (my $row = $sth->fetchrow_hashref) {
206 $from_ord = $row->{ord} - 1;
207 } else {
208 # if no match is found when searching from beginning
209 # of word in index, try substring match anywhere
210 $sql2 = qq{
211 select data.ord as ord
212 from $tables_sql
213 where name = ? and item like '%'||?||'%'
214 $where_sql
215 order by data.ord
216 };
217
218 $sth = $self->{dbh}->prepare($sql2) || confess "sql2: $sql2; ".$self->{dbh}->errstr();
219 $sth->execute(@sql_args) || confess "sql2: $sql2; ".$self->{dbh}->errstr();
220
221 if (my $row = $sth->fetchrow_hashref) {
222 $from_ord = $row->{ord} - 1;
223 }
224 }
225 }
226
227 @sql_args = ( $field, $from_ord );
228 push @sql_args, $filter if ($filter);
229
230 my $sql = qq{
231 select item,display,data.count as count
232 from $tables_sql
233 where name = ?
234 and data.ord > ?
235 $where_sql
236 order by data.ord
237 };
238
239 # fix SQLite problem which doesn't allow placeholders in limit and offset
240 # http://thread.gmane.org/gmane.comp.db.sqlite.general/9707
241 $sql .= "limit $rows offset $offset";
242
243 my $sth = $self->{dbh}->prepare($sql) || confess "prepare: $sql; ".$self->{dbh}->errstr();
244 $sth->execute(@sql_args) || confess "execute: $sql; ".join("|",@sql_args)." ".$self->{dbh}->errstr();
245 my @arr;
246 while (my $row = $sth->fetchrow_hashref) {
247 $row->{item} = HTML::Entities::encode($row->{item},' <>&"');
248 $row->{display} = HTML::Entities::encode($row->{display},'<>&"');
249 $row->{item} =~ s#&amp;(\w)(acute|cedil|circ|grave|ring|slash|tilde|uml);#$1#gi;
250 $row->{display} =~ s#&amp;(\w)(acute|cedil|circ|grave|ring|slash|tilde|uml);#&$1$2;#gi;
251 push @arr,$row;
252 }
253 return @arr;
254 }
255
256 sub close {
257 my $self = shift;
258
259 return if (! $self->{dbh});
260
261 $self->{dbh}->begin_work || confess $self->{dbh}->errstr();
262
263 $self->delete_and_create('data', qq{
264 create table data (
265 name varchar(255),
266 ord int,
267 item text,
268 display text,
269 count int,
270 primary key (name,ord)
271 );
272 });
273
274 $self->delete_and_create('filters', qq{
275 create table filters (
276 filter varchar(255),
277 ord int,
278 count int,
279 primary key (filter,ord)
280 );
281 });
282
283 $self->bench("getting all entries");
284 my @items = keys %{$self->{c}};
285 $self->bench("got ".($#items+1)." items, now sorting");
286 @items = sort @items;
287
288 my $sql = "insert into data (name,ord,item,display,count) values (?,?,?,?,?)";
289 my $sth_index = $self->{dbh}->prepare($sql) || confess "$sql: ".$self->{dbh}->errstr();
290
291 $sql = "insert into filters (filter, ord, count) values (?,?,?)";
292 my $sth_filter = $self->{dbh}->prepare($sql) || confess "$sql: ".$self->{dbh}->errstr();
293
294 my $ord = 0;
295 foreach my $key (@items) {
296
297 foreach my $field (keys %{$self->{c}->{$key}}) {
298 # store items
299 $sth_index->execute(
300 $field,
301 ++$ord,
302 $self->{c}->{$key}->{$field}->{item},
303 $self->{c}->{$key}->{$field}->{display},
304 $self->{c}->{$key}->{$field}->{count},
305 );
306
307 # store filters
308 next unless ($self->{c}->{$key}->{$field}->{filter});
309
310 foreach my $filter (keys %{$self->{c}->{$key}->{$field}->{filter}}) {
311 $sth_filter->execute( $filter, $ord, $self->{c}->{$key}->{$field}->{filter}->{$filter} );
312 }
313 }
314
315
316 }
317
318 $self->{dbh}->commit || confess $self->{dbh}->errstr();
319
320 $self->bench("vacuuming");
321
322 if ($self->{dbd} =~ m/(Pg|SQLite)/) {
323 $self->{dbh}->do(qq{vacuum}) || carp "vacumming failed. It shouldn't if you are using PostgreSQL or SQLite: ".$self->{dbh}->errstr();
324 }
325
326 $self->bench("disconnecting from database");
327
328 $self->{dbh}->disconnect;
329 undef $self->{dbh};
330 }
331
332 END {
333 $Count--;
334 print STDERR "index_DBI fatal error: \$index->close() not called... $Count references left!\n" if ($Count > 0);
335 # FIX: debug output
336 # print STDERR "usage\ttable\n";
337 # foreach (keys %Table) {
338 # print STDERR $Table{$_},"\t$_\n";
339 # }
340 }
341
342 1;

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