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

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Revision 226 - (show annotations)
Wed Feb 11 08:33:51 2004 UTC (15 years, 10 months ago) by dpavlin
File size: 6414 byte(s)
added SQLite parametar sqlite_handle_binary_nulls

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
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 # bench time
26 my $bench_time = time();
27
28 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 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 $self->{dbd} = $dbd;
48
49 $self->{dbh} = DBI->connect("DBI:$dbd:$dsn",$user,$passwd) || die $DBI::errstr;
50 $Count++;
51
52 $self->bench("connected to $dbd as $user");
53
54 # 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 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 my $sth = $self->{dbh}->prepare($sql) || die $self->{dbh}->errstr();
73 # FIX: this is not a good way to check if table exists!
74 if ($sth->execute() && $sth->fetchrow_hashref) {
75 my $sql = "drop table $field";
76 my $sth = $self->{dbh}->do($sql) || warn "SQL: $sql - ".$sth->errstr();
77 }
78 $sql = "create table $field (
79 item varchar(255),
80 display text,
81 count int,
82 ord int,
83 primary key (item)
84 )";
85
86 $sth = $self->{dbh}->do($sql) || warn "SQL: $sql ".$self->{dbh}->errstr();
87 }
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 my $display = shift || $index_data;
95
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
105 # XXX for some strange reason, it seems that some entries in my
106 # database produce strings which start with null byte. I suspect
107 # this to be bug in OpenIsis 0.9.0.
108 # This should fix it..
109 $index_data =~ s/^[^\w]+//;
110 $index_data = substr($index_data,0,255);
111
112 my $uc = uc($index_data);
113 if (! $c_table->{$field}->{$uc}) {
114 #print stderr "in index: $index_data\n";
115 $c_table->{$field}->{$uc} = $index_data;
116 $c_table->{$field}->{$uc}->{display} = $display;
117 $c_count->{$field}->{$uc} = 1;
118 } else {
119 $c_count->{$field}->{$uc}++;
120 }
121 }
122
123 sub count {
124 my $self = shift;
125
126 my $field = shift;
127 my $where = shift;
128
129 my $sql = "select count(*) from $field where upper(item) like upper(?)||'%'";
130
131 my $sth = $self->{dbh}->prepare($sql) || die $self->{dbh}->errstr();
132 $sth->execute($where) || die "sql: $sql; ".$self->{dbh}->errstr();
133
134 my ($total) = $sth->fetchrow_array();
135
136 # no results, count all
137 if (! $total) {
138 my $sql = "select count(*) from $field";
139
140 my $sth = $self->{dbh}->prepare($sql) || die $self->{dbh}->errstr();
141 $sth->execute() || die "sql: $sql; ".$self->{dbh}->errstr();
142 $total = $sth->fetchrow_array();
143
144 }
145
146 return $total || 1;
147 }
148
149
150 sub fetch {
151 my $self = shift;
152
153 my $field = shift;
154 my $where = shift;
155
156 my $from_ord = shift || 0;
157 my $rows = shift || 10;
158
159 my @sql_args;
160
161 my $sql = "select item,display,ord from $field";
162
163 if ($where) {
164 my $sql2 = "select ord from $field where upper(item) like upper(?)||'%'";
165 my $sth = $self->{dbh}->prepare($sql2) || die "sql2: $sql2; ".$self->{dbh}->errstr();
166
167 $sth->execute($where) || die "sql2: $sql2; ".$self->{dbh}->errstr();
168 if (my $row = $sth->fetchrow_hashref) {
169 $from_ord += $row->{ord} - 1;
170 } else {
171 # if no match is found when searching from beginning
172 # of word in index, try substring match anywhere
173 $sql2 = "select ord from $field where upper(item) like '% '||upper(?)||'%'";
174 $sth = $self->{dbh}->prepare($sql2) || die "sql2: $sql2; ".$self->{dbh}->errstr();
175 $sth->execute($where) || die "sql2: $sql2; ".$self->{dbh}->errstr();
176 if (my $row = $sth->fetchrow_hashref) {
177 $from_ord += $row->{ord} - 1;
178 }
179 }
180 }
181 $sql .= " order by ord limit $rows offset $from_ord";
182
183 my $sth = $self->{dbh}->prepare($sql) || die "prepare: $sql; ".$self->{dbh}->errstr();
184 $sth->execute() || die "execute: $sql; ".$self->{dbh}->errstr();
185 my @arr;
186 while (my $row = $sth->fetchrow_hashref) {
187 $row->{item} = HTML::Entities::encode($row->{item},' <>&"');
188 $row->{display} = HTML::Entities::encode($row->{display},'<>&"');
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 foreach my $table (keys %Table) {
200 $self->bench("Crating table $table");
201 $self->delete_and_create($table);
202
203 $self->{dbh}->begin_work || die $self->{dbh}->errstr();
204
205 $self->bench("Sorting ".$Table{$table}." (with duplicates) items in $table");
206 my @keys = sort keys %{$c_table->{$table}};
207
208 $self->bench("Dumping ".($#keys+1)." items into $table");
209 my $sql = "insert into $table (ord,item,display,count) values (?,?,?,?)";
210 my $sth = $self->{dbh}->prepare($sql) || die "sql: $sql; ".$self->{dbh}->errstr();
211
212 my $ord = 0;
213 foreach my $key (@keys) {
214 $sth->execute(++$ord,
215 $c_table->{$table}->{$key},
216 $c_table->{$table}->{$key}->{display},
217 $c_count->{$table}->{$key}
218 );
219 }
220
221 $self->{dbh}->commit || die $self->{dbh}->errstr();
222 }
223
224 if ($self->{dbd} =~ m/(Pg|SQLite)/) {
225 $self->{dbh}->do(qq{vacuum}) || warn "vacumming failed. It shouldn't if you are using PostgreSQL or SQLite: ".$self->{dbh}->errstr();
226 }
227
228 $self->bench("disconnecting from database");
229
230 $self->{dbh}->disconnect;
231 undef $self->{dbh};
232 }
233
234 END {
235 $Count--;
236 print STDERR "index_DBI fatal error: \$index->close() not called... $Count references left!\n" if ($Count > 0);
237 # FIX: debug output
238 # print STDERR "usage\ttable\n";
239 # foreach (keys %Table) {
240 # print STDERR $Table{$_},"\t$_\n";
241 # }
242 }
243
244 1;

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