/[webpac]/trunk/index_DBI_cache.pm
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Annotation of /trunk/index_DBI_cache.pm

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Revision 631 - (hide annotations)
Sun Jan 16 18:29:24 2005 UTC (14 years, 9 months ago) by dpavlin
File size: 6379 byte(s)
correct support for accented letters entered as html entities in input data.

1 dpavlin 60 #
2     # this file implements index functions using DBI
3     # and huge amounts of memory for cache speedup
4     #
5 dpavlin 94 # this version doesn't support ident (which sould be location in
6     # library). But, that functionality is not used anyway...
7     #
8 dpavlin 60
9     package index_DBI;
10     use strict qw(vars);
11     use vars qw($Count);
12     use HTML::Entities;
13 dpavlin 188 use URI::Escape;
14 dpavlin 192 use locale;
15 dpavlin 60
16     use DBI;
17    
18     my %Table; # index tables which where visited in this run
19     my %sth_cache; # cache prepared statements
20    
21     # cache var
22     my $c_table;
23     my $c_count;
24    
25 dpavlin 88 # bench time
26 dpavlin 94 my $bench_time = time();
27 dpavlin 88
28 dpavlin 94 sub bench {
29     my $self = shift;
30     my $msg = shift;
31    
32     print STDERR "last operation took ",time()-$bench_time," seconds...\n";
33     $bench_time=time();
34     print STDERR "$msg\n";
35     }
36    
37 dpavlin 60 sub new {
38     my $class = shift;
39     my $self = {};
40     bless($self, $class);
41    
42     my $dbd = shift || die "need dbi_dbd= in [global] section of configuration file";
43     my $dsn = shift || die "need dbi_dsn= in [global] section of configuration file";
44     my $user = shift || die "need dbi_user= in [global] section of configuration file";
45     my $passwd = shift || die "need dbi_passwd= in [global] section of configuration file";
46    
47 dpavlin 206 $self->{dbd} = $dbd;
48    
49 dpavlin 60 $self->{dbh} = DBI->connect("DBI:$dbd:$dsn",$user,$passwd) || die $DBI::errstr;
50     $Count++;
51    
52 dpavlin 94 $self->bench("connected to $dbd as $user");
53    
54 dpavlin 226 # force SQLite to support binary 0 in data (which shouldn't
55     # happend, but it did to me)
56     eval {
57     no warnings 'all';
58     $self->{dbh}->{sqlite_handle_binary_nulls} = 1;
59     };
60    
61 dpavlin 60 return $self;
62     }
63    
64     sub delete_and_create {
65     my $self = shift;
66    
67     my $field = shift;
68    
69     #print "#### delete_and_create($field)\n";
70    
71     my $sql = "select count(*) from $field";
72 dpavlin 399 my $sth = $self->{dbh}->prepare($sql);
73 dpavlin 60 # FIX: this is not a good way to check if table exists!
74 dpavlin 399 if ($sth && $sth->execute() && $sth->fetchrow_hashref) {
75 dpavlin 60 my $sql = "drop table $field";
76 dpavlin 225 my $sth = $self->{dbh}->do($sql) || warn "SQL: $sql - ".$sth->errstr();
77 dpavlin 60 }
78     $sql = "create table $field (
79     item varchar(255),
80 dpavlin 188 display text,
81 dpavlin 60 count int,
82     ord int,
83 dpavlin 94 primary key (item)
84 dpavlin 60 )";
85    
86 dpavlin 94 $sth = $self->{dbh}->do($sql) || warn "SQL: $sql ".$self->{dbh}->errstr();
87 dpavlin 60 }
88    
89     sub insert {
90     my $self = shift;
91    
92     my $field = shift;
93     my $index_data = shift || print STDERR "\$index->insert($field,NULL,...)";
94 dpavlin 188 my $display = shift || $index_data;
95 dpavlin 60
96     if (! $index_data) {
97     print STDERR "\$index->insert() -- no value to insert\n";
98     return;
99     }
100    
101     $Table{$field}++;
102    
103     #$sth_cache{$field."select"}->execute($index_data) || die "cache: $field select; ".$self->{dbh}->errstr();
104 dpavlin 93
105 dpavlin 631 $index_data =~ s#&(\w)(acute|cedil|circ|grave|ring|slash|tilde|uml);#$1#gi;
106    
107 dpavlin 60 my $uc = uc($index_data);
108 dpavlin 94 if (! $c_table->{$field}->{$uc}) {
109 dpavlin 60 #print stderr "in index: $index_data\n";
110 dpavlin 94 $c_table->{$field}->{$uc} = $index_data;
111 dpavlin 188 $c_table->{$field}->{$uc}->{display} = $display;
112 dpavlin 94 $c_count->{$field}->{$uc} = 1;
113 dpavlin 60 } else {
114 dpavlin 94 $c_count->{$field}->{$uc}++;
115 dpavlin 60 }
116     }
117    
118 dpavlin 140 sub count {
119 dpavlin 60 my $self = shift;
120    
121     my $field = shift;
122 dpavlin 140 my $where = shift;
123 dpavlin 60
124 dpavlin 140 my $sql = "select count(*) from $field where upper(item) like upper(?)||'%'";
125 dpavlin 60
126     my $sth = $self->{dbh}->prepare($sql) || die $self->{dbh}->errstr();
127 dpavlin 140 $sth->execute($where) || die "sql: $sql; ".$self->{dbh}->errstr();
128 dpavlin 60
129     my ($total) = $sth->fetchrow_array();
130    
131 dpavlin 142 # no results, count all
132     if (! $total) {
133     my $sql = "select count(*) from $field";
134    
135     my $sth = $self->{dbh}->prepare($sql) || die $self->{dbh}->errstr();
136     $sth->execute() || die "sql: $sql; ".$self->{dbh}->errstr();
137     $total = $sth->fetchrow_array();
138    
139     }
140    
141     return $total || 1;
142 dpavlin 60 }
143    
144    
145     sub fetch {
146     my $self = shift;
147    
148     my $field = shift;
149     my $where = shift;
150    
151     my $from_ord = shift || 0;
152     my $rows = shift || 10;
153    
154     my @sql_args;
155    
156 dpavlin 188 my $sql = "select item,display,ord from $field";
157 dpavlin 60
158     if ($where) {
159 dpavlin 140 my $sql2 = "select ord from $field where upper(item) like upper(?)||'%'";
160 dpavlin 60 my $sth = $self->{dbh}->prepare($sql2) || die "sql2: $sql2; ".$self->{dbh}->errstr();
161    
162     $sth->execute($where) || die "sql2: $sql2; ".$self->{dbh}->errstr();
163     if (my $row = $sth->fetchrow_hashref) {
164     $from_ord += $row->{ord} - 1;
165 dpavlin 127 } else {
166     # if no match is found when searching from beginning
167     # of word in index, try substring match anywhere
168 dpavlin 201 $sql2 = "select ord from $field where upper(item) like '% '||upper(?)||'%'";
169 dpavlin 127 $sth = $self->{dbh}->prepare($sql2) || die "sql2: $sql2; ".$self->{dbh}->errstr();
170     $sth->execute($where) || die "sql2: $sql2; ".$self->{dbh}->errstr();
171     if (my $row = $sth->fetchrow_hashref) {
172     $from_ord += $row->{ord} - 1;
173     }
174 dpavlin 60 }
175     }
176     $sql .= " order by ord limit $rows offset $from_ord";
177    
178     my $sth = $self->{dbh}->prepare($sql) || die "prepare: $sql; ".$self->{dbh}->errstr();
179     $sth->execute() || die "execute: $sql; ".$self->{dbh}->errstr();
180     my @arr;
181     while (my $row = $sth->fetchrow_hashref) {
182 dpavlin 188 $row->{item} = HTML::Entities::encode($row->{item},' <>&"');
183     $row->{display} = HTML::Entities::encode($row->{display},'<>&"');
184 dpavlin 631 $row->{item} =~ s#&amp;(\w)(acute|cedil|circ|grave|ring|slash|tilde|uml);#$1#gi;
185     $row->{display} =~ s#&amp;(\w)(acute|cedil|circ|grave|ring|slash|tilde|uml);#&$1$2;#gi;
186 dpavlin 60 push @arr,$row;
187     }
188     return @arr;
189     }
190    
191     sub close {
192     my $self = shift;
193    
194 dpavlin 94 return if (! $self->{dbh});
195 dpavlin 60
196 dpavlin 94 foreach my $table (keys %Table) {
197     $self->bench("Crating table $table");
198     $self->delete_and_create($table);
199 dpavlin 60
200     $self->{dbh}->begin_work || die $self->{dbh}->errstr();
201    
202 dpavlin 219 $self->bench("Sorting ".$Table{$table}." (with duplicates) items in $table");
203 dpavlin 94 my @keys = sort keys %{$c_table->{$table}};
204    
205 dpavlin 219 $self->bench("Dumping ".($#keys+1)." items into $table");
206 dpavlin 188 my $sql = "insert into $table (ord,item,display,count) values (?,?,?,?)";
207 dpavlin 60 my $sth = $self->{dbh}->prepare($sql) || die "sql: $sql; ".$self->{dbh}->errstr();
208 dpavlin 94
209     my $ord = 0;
210     foreach my $key (@keys) {
211 dpavlin 95 $sth->execute(++$ord,
212 dpavlin 94 $c_table->{$table}->{$key},
213 dpavlin 188 $c_table->{$table}->{$key}->{display},
214 dpavlin 94 $c_count->{$table}->{$key}
215     );
216 dpavlin 60 }
217    
218     $self->{dbh}->commit || die $self->{dbh}->errstr();
219     }
220 dpavlin 206
221     if ($self->{dbd} =~ m/(Pg|SQLite)/) {
222     $self->{dbh}->do(qq{vacuum}) || warn "vacumming failed. It shouldn't if you are using PostgreSQL or SQLite: ".$self->{dbh}->errstr();
223     }
224    
225 dpavlin 94 $self->bench("disconnecting from database");
226 dpavlin 60
227 dpavlin 94 $self->{dbh}->disconnect;
228     undef $self->{dbh};
229 dpavlin 60 }
230    
231     END {
232     $Count--;
233     print STDERR "index_DBI fatal error: \$index->close() not called... $Count references left!\n" if ($Count > 0);
234     # FIX: debug output
235     # print STDERR "usage\ttable\n";
236     # foreach (keys %Table) {
237     # print STDERR $Table{$_},"\t$_\n";
238     # }
239     }
240    
241     1;

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