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

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Revision 201 - (show annotations)
Sat Jan 17 14:00:26 2004 UTC (15 years, 8 months ago) by dpavlin
File size: 6007 byte(s)
changed behaviour when searching index and no entry beginning with string is
found: until now, it found first substring, and now it find substring from
beginning of word (it has to have space before it)

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 $self->{dbh} = DBI->connect("DBI:$dbd:$dsn",$user,$passwd) || die $DBI::errstr;
48 $Count++;
49
50 $self->bench("connected to $dbd as $user");
51
52 return $self;
53 }
54
55 sub delete_and_create {
56 my $self = shift;
57
58 my $field = shift;
59
60 #print "#### delete_and_create($field)\n";
61
62 my $sql = "select count(*) from $field";
63 my $sth = $self->{dbh}->prepare($sql) || die $self->{dbh}->errstr();
64 # FIX: this is not a good way to check if table exists!
65 if ($sth->execute() && $sth->fetchrow_hashref) {
66 my $sql = "drop table $field";
67 my $sth = $self->{dbh}->do($sql) || die "SQL: $sql ".$self->{dbh}->errstr();
68 }
69 $sql = "create table $field (
70 item varchar(255),
71 display text,
72 count int,
73 ord int,
74 primary key (item)
75 )";
76
77 $sth = $self->{dbh}->do($sql) || warn "SQL: $sql ".$self->{dbh}->errstr();
78 }
79
80 sub insert {
81 my $self = shift;
82
83 my $field = shift;
84 my $index_data = shift || print STDERR "\$index->insert($field,NULL,...)";
85 my $display = shift || $index_data;
86
87 if (! $index_data) {
88 print STDERR "\$index->insert() -- no value to insert\n";
89 return;
90 }
91
92 $Table{$field}++;
93
94 #$sth_cache{$field."select"}->execute($index_data) || die "cache: $field select; ".$self->{dbh}->errstr();
95
96 # XXX for some strange reason, it seems that some entries in my
97 # database produce strings which start with null byte. I suspect
98 # this to be bug in OpenIsis 0.9.0.
99 # This should fix it..
100 $index_data =~ s/^[^\w]+//;
101 $index_data = substr($index_data,0,255);
102
103 my $uc = uc($index_data);
104 if (! $c_table->{$field}->{$uc}) {
105 #print stderr "in index: $index_data\n";
106 $c_table->{$field}->{$uc} = $index_data;
107 $c_table->{$field}->{$uc}->{display} = $display;
108 $c_count->{$field}->{$uc} = 1;
109 } else {
110 $c_count->{$field}->{$uc}++;
111 }
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 $field where upper(item) like upper(?)||'%'";
121
122 my $sth = $self->{dbh}->prepare($sql) || die $self->{dbh}->errstr();
123 $sth->execute($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 $field";
130
131 my $sth = $self->{dbh}->prepare($sql) || die $self->{dbh}->errstr();
132 $sth->execute() || 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 $from_ord = shift || 0;
148 my $rows = shift || 10;
149
150 my @sql_args;
151
152 my $sql = "select item,display,ord from $field";
153
154 if ($where) {
155 my $sql2 = "select ord from $field where upper(item) like upper(?)||'%'";
156 my $sth = $self->{dbh}->prepare($sql2) || die "sql2: $sql2; ".$self->{dbh}->errstr();
157
158 $sth->execute($where) || die "sql2: $sql2; ".$self->{dbh}->errstr();
159 if (my $row = $sth->fetchrow_hashref) {
160 $from_ord += $row->{ord} - 1;
161 } else {
162 # if no match is found when searching from beginning
163 # of word in index, try substring match anywhere
164 $sql2 = "select ord from $field where upper(item) like '% '||upper(?)||'%'";
165 $sth = $self->{dbh}->prepare($sql2) || die "sql2: $sql2; ".$self->{dbh}->errstr();
166 $sth->execute($where) || die "sql2: $sql2; ".$self->{dbh}->errstr();
167 if (my $row = $sth->fetchrow_hashref) {
168 $from_ord += $row->{ord} - 1;
169 }
170 }
171 }
172 $sql .= " order by ord limit $rows offset $from_ord";
173
174 my $sth = $self->{dbh}->prepare($sql) || die "prepare: $sql; ".$self->{dbh}->errstr();
175 $sth->execute() || die "execute: $sql; ".$self->{dbh}->errstr();
176 my @arr;
177 while (my $row = $sth->fetchrow_hashref) {
178 $row->{item} = HTML::Entities::encode($row->{item},' <>&"');
179 $row->{display} = HTML::Entities::encode($row->{display},'<>&"');
180 push @arr,$row;
181 }
182 return @arr;
183 }
184
185 sub close {
186 my $self = shift;
187
188 return if (! $self->{dbh});
189
190 foreach my $table (keys %Table) {
191 $self->bench("Crating table $table");
192 $self->delete_and_create($table);
193
194 $self->{dbh}->begin_work || die $self->{dbh}->errstr();
195
196 $self->bench("Sorting ".$Table{$table}." items in $table");
197 my @keys = sort keys %{$c_table->{$table}};
198
199 $self->bench("Dumping data into $table");
200 my $sql = "insert into $table (ord,item,display,count) values (?,?,?,?)";
201 my $sth = $self->{dbh}->prepare($sql) || die "sql: $sql; ".$self->{dbh}->errstr();
202
203 my $ord = 0;
204 foreach my $key (@keys) {
205 $sth->execute(++$ord,
206 $c_table->{$table}->{$key},
207 $c_table->{$table}->{$key}->{display},
208 $c_count->{$table}->{$key}
209 );
210 }
211
212 $self->{dbh}->commit || die $self->{dbh}->errstr();
213 }
214 $self->bench("disconnecting from database");
215
216 $self->{dbh}->disconnect;
217 undef $self->{dbh};
218 }
219
220 END {
221 $Count--;
222 print STDERR "index_DBI fatal error: \$index->close() not called... $Count references left!\n" if ($Count > 0);
223 # FIX: debug output
224 # print STDERR "usage\ttable\n";
225 # foreach (keys %Table) {
226 # print STDERR $Table{$_},"\t$_\n";
227 # }
228 }
229
230 1;

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