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

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Revision 652 - (show annotations)
Thu Jan 27 21:17:47 2005 UTC (14 years, 10 months ago) by dpavlin
File size: 8274 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 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 $table = shift || croak "need table name!";
64 my $sql = shift || croak "need sql to create table!";
65
66 print STDERR "## delete_and_create($table)\n" if ($debug);
67
68 my $sql_delete = "delete from $table";
69 my $sth = $self->{dbh}->prepare($sql_delete);
70
71 if ($sth && $sth->execute()) {
72 print STDERR "## deleted rows from table $table\n" if ($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 $table\n" if ($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 $filter = shift;
121
122 my $tables_sql = 'data';
123 my $where_sql = '';
124 my @sql_args = ( $field, $where );
125
126 if ($filter) {
127 $tables_sql .= ",filters";
128 $where_sql .= "
129 and data.ord = filters.ord
130 and filter = ?
131 ";
132 push @sql_args, $filter;
133 }
134
135 my $sql = qq{
136 select count(*)
137 from $tables_sql
138 where name = ? and upper(item) like upper(?)||'%'
139 $where_sql
140 };
141
142 my $sth = $self->{dbh}->prepare($sql) || confess $self->{dbh}->errstr();
143 $sth->execute(@sql_args) || confess "sql: $sql; ".$self->{dbh}->errstr();
144
145 my ($total) = $sth->fetchrow_array();
146
147 # no results, count all
148 if (! $total) {
149 my $sql = qq{
150 select count(*)
151 from $tables_sql
152 where data.name = ?
153 $where_sql
154 };
155
156 @sql_args = ( $field );
157 push @sql_args, $filter if ($filter);
158
159 my $sth = $self->{dbh}->prepare($sql) || confess $self->{dbh}->errstr();
160 $sth->execute(@sql_args) || confess "sql: $sql; ".$self->{dbh}->errstr();
161 $total = $sth->fetchrow_array();
162
163 }
164
165 return $total || '0';
166 }
167
168
169 sub fetch {
170 my $self = shift;
171
172 my $field = shift;
173 my $where = shift;
174
175 my $offset = shift || 0;
176 my $rows = shift || 10;
177 my $filter = shift;
178
179 my $from_ord = 0;
180
181 my $tables_sql = 'data';
182 my $where_sql = '';
183
184 my @sql_args = ( $field, $where );
185
186 if ($filter) {
187 $tables_sql .= ",filters";
188 $where_sql .= "
189 and data.ord = filters.ord
190 and filter = ?
191 ";
192 push @sql_args, $filter;
193 }
194
195 if ($where) {
196 my $sql2 = qq{
197 select data.ord as ord
198 from $tables_sql
199 where name = ? and upper(item) like upper(?)||'%'
200 $where_sql
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 upper(item) like '% '||upper(?)||'%'
214 $where_sql
215 };
216
217 $sth = $self->{dbh}->prepare($sql2) || confess "sql2: $sql2; ".$self->{dbh}->errstr();
218 $sth->execute(@sql_args) || confess "sql2: $sql2; ".$self->{dbh}->errstr();
219
220 if (my $row = $sth->fetchrow_hashref) {
221 $from_ord += $row->{ord} - 1;
222 }
223 }
224 }
225
226 @sql_args = ( $field, $from_ord );
227 push @sql_args, $filter if ($filter);
228
229 my $sql = qq{
230 select item,display,data.count as count
231 from $tables_sql
232 where name = ?
233 and data.ord > ?
234 $where_sql
235 order by data.ord
236 };
237
238 # fix SQLite problem which doesn't allow placeholders in limit and offset
239 # http://thread.gmane.org/gmane.comp.db.sqlite.general/9707
240 $sql .= "limit $rows offset $offset";
241
242 my $sth = $self->{dbh}->prepare($sql) || confess "prepare: $sql; ".$self->{dbh}->errstr();
243 $sth->execute(@sql_args) || confess "execute: $sql; ".join("|",@sql_args)." ".$self->{dbh}->errstr();
244 my @arr;
245 while (my $row = $sth->fetchrow_hashref) {
246 $row->{item} = HTML::Entities::encode($row->{item},' <>&"');
247 $row->{display} = HTML::Entities::encode($row->{display},'<>&"');
248 $row->{item} =~ s#&amp;(\w)(acute|cedil|circ|grave|ring|slash|tilde|uml);#$1#gi;
249 $row->{display} =~ s#&amp;(\w)(acute|cedil|circ|grave|ring|slash|tilde|uml);#&$1$2;#gi;
250 push @arr,$row;
251 }
252 return @arr;
253 }
254
255 sub close {
256 my $self = shift;
257
258 return if (! $self->{dbh});
259
260 $self->{dbh}->begin_work || confess $self->{dbh}->errstr();
261
262 $self->delete_and_create('data', qq{
263 create table data (
264 name varchar(255),
265 ord int,
266 item text,
267 display text,
268 count int,
269 primary key (name,ord)
270 );
271 });
272
273 $self->delete_and_create('filters', qq{
274 create table filters (
275 filter varchar(255),
276 ord int,
277 count int,
278 primary key (filter,ord)
279 );
280 });
281
282 $self->bench("getting all entries");
283 my @items = keys %{$self->{c}};
284 $self->bench("got ".($#items+1)." items, now sorting");
285 @items = sort @items;
286
287 my $sql = "insert into data (name,ord,item,display,count) values (?,?,?,?,?)";
288 my $sth_index = $self->{dbh}->prepare($sql) || confess "$sql: ".$self->{dbh}->errstr();
289
290 $sql = "insert into filters (filter, ord, count) values (?,?,?)";
291 my $sth_filter = $self->{dbh}->prepare($sql) || confess "$sql: ".$self->{dbh}->errstr();
292
293 my $ord = 0;
294 foreach my $key (@items) {
295
296 foreach my $field (keys %{$self->{c}->{$key}}) {
297 # store items
298 $sth_index->execute(
299 $field,
300 ++$ord,
301 $self->{c}->{$key}->{$field}->{item},
302 $self->{c}->{$key}->{$field}->{display},
303 $self->{c}->{$key}->{$field}->{count},
304 );
305
306 # store filters
307 next unless ($self->{c}->{$key}->{$field}->{filter});
308
309 foreach my $filter (keys %{$self->{c}->{$key}->{$field}->{filter}}) {
310 $sth_filter->execute( $filter, $ord, $self->{c}->{$key}->{$field}->{filter}->{$filter} );
311 }
312 }
313
314
315 }
316
317 $self->{dbh}->commit || confess $self->{dbh}->errstr();
318
319 $self->bench("vacuuming");
320
321 if ($self->{dbd} =~ m/(Pg|SQLite)/) {
322 $self->{dbh}->do(qq{vacuum}) || carp "vacumming failed. It shouldn't if you are using PostgreSQL or SQLite: ".$self->{dbh}->errstr();
323 }
324
325 $self->bench("disconnecting from database");
326
327 $self->{dbh}->disconnect;
328 undef $self->{dbh};
329 }
330
331 END {
332 $Count--;
333 print STDERR "index_DBI fatal error: \$index->close() not called... $Count references left!\n" if ($Count > 0);
334 # FIX: debug output
335 # print STDERR "usage\ttable\n";
336 # foreach (keys %Table) {
337 # print STDERR $Table{$_},"\t$_\n";
338 # }
339 }
340
341 1;

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