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

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Revision 95 - (hide annotations)
Sun Jul 13 21:54:22 2003 UTC (16 years, 4 months ago) by dpavlin
File size: 5067 byte(s)
fix: first index entry should have nr. 1 not 0

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    
14     use DBI;
15    
16     my %Table; # index tables which where visited in this run
17     my %sth_cache; # cache prepared statements
18    
19     # cache var
20     my $c_table;
21     my $c_count;
22    
23 dpavlin 88 # bench time
24 dpavlin 94 my $bench_time = time();
25 dpavlin 88
26 dpavlin 94 sub bench {
27     my $self = shift;
28     my $msg = shift;
29    
30     print STDERR "last operation took ",time()-$bench_time," seconds...\n";
31     $bench_time=time();
32     print STDERR "$msg\n";
33     }
34    
35 dpavlin 60 sub new {
36     my $class = shift;
37     my $self = {};
38     bless($self, $class);
39    
40     my $dbd = shift || die "need dbi_dbd= in [global] section of configuration file";
41     my $dsn = shift || die "need dbi_dsn= in [global] section of configuration file";
42     my $user = shift || die "need dbi_user= in [global] section of configuration file";
43     my $passwd = shift || die "need dbi_passwd= in [global] section of configuration file";
44    
45     $self->{dbh} = DBI->connect("DBI:$dbd:$dsn",$user,$passwd) || die $DBI::errstr;
46     $Count++;
47    
48 dpavlin 94 $self->bench("connected to $dbd as $user");
49    
50 dpavlin 60 return $self;
51     }
52    
53     sub delete_and_create {
54     my $self = shift;
55    
56     my $field = shift;
57    
58     #print "#### delete_and_create($field)\n";
59    
60     my $sql = "select count(*) from $field";
61     my $sth = $self->{dbh}->prepare($sql) || die $self->{dbh}->errstr();
62     # FIX: this is not a good way to check if table exists!
63     if ($sth->execute() && $sth->fetchrow_hashref) {
64     my $sql = "drop table $field";
65     my $sth = $self->{dbh}->do($sql) || die "SQL: $sql ".$self->{dbh}->errstr();
66     }
67     $sql = "create table $field (
68     item varchar(255),
69     count int,
70     ord int,
71 dpavlin 94 primary key (item)
72 dpavlin 60 )";
73    
74 dpavlin 94 $sth = $self->{dbh}->do($sql) || warn "SQL: $sql ".$self->{dbh}->errstr();
75 dpavlin 60 }
76    
77     sub insert {
78     my $self = shift;
79    
80     my $field = shift;
81     my $index_data = shift || print STDERR "\$index->insert($field,NULL,...)";
82     my $ident = shift || ''; # e.g. library id
83    
84     if (! $index_data) {
85     print STDERR "\$index->insert() -- no value to insert\n";
86     return;
87     }
88    
89     $Table{$field}++;
90    
91     #$sth_cache{$field."select"}->execute($index_data) || die "cache: $field select; ".$self->{dbh}->errstr();
92 dpavlin 93
93     # XXX for some strange reason, it seems that some entries in my
94     # database produce strings which start with null byte. I suspect
95     # this to be bug in OpenIsis 0.9.0.
96     # This should fix it..
97     $index_data =~ s/^[^\w]+//;
98 dpavlin 60 $index_data = substr($index_data,0,255);
99 dpavlin 93
100 dpavlin 60 my $uc = uc($index_data);
101 dpavlin 94 if (! $c_table->{$field}->{$uc}) {
102 dpavlin 60 #print stderr "in index: $index_data\n";
103 dpavlin 94 $c_table->{$field}->{$uc} = $index_data;
104     $c_count->{$field}->{$uc} = 1;
105 dpavlin 60 } else {
106 dpavlin 94 $c_count->{$field}->{$uc}++;
107 dpavlin 60 }
108     }
109    
110     sub check {
111     my $self = shift;
112    
113     my $field = shift;
114    
115     my $sql = "select count(*) from $field";
116    
117     my $sth = $self->{dbh}->prepare($sql) || die $self->{dbh}->errstr();
118     $sth->execute() || die "sql: $sql; ".$self->{dbh}->errstr();
119    
120     my ($total) = $sth->fetchrow_array();
121    
122     return $total;
123     }
124    
125    
126     sub fetch {
127     my $self = shift;
128    
129     my $field = shift;
130     my $what = shift || 'item'; # 'item,ident'
131     my $where = shift;
132    
133     my $from_ord = shift || 0;
134     my $rows = shift || 10;
135    
136     my @sql_args;
137    
138     my $sql = "select $what,ord from $field";
139    
140     if ($where) {
141     my $sql2 = " select ord from $field where upper($what) like upper(?)||'%'";
142     my $sth = $self->{dbh}->prepare($sql2) || die "sql2: $sql2; ".$self->{dbh}->errstr();
143    
144     $sth->execute($where) || die "sql2: $sql2; ".$self->{dbh}->errstr();
145     if (my $row = $sth->fetchrow_hashref) {
146     $from_ord += $row->{ord} - 1;
147     }
148     }
149     $sql .= " order by ord limit $rows offset $from_ord";
150    
151     my $sth = $self->{dbh}->prepare($sql) || die "prepare: $sql; ".$self->{dbh}->errstr();
152     $sth->execute() || die "execute: $sql; ".$self->{dbh}->errstr();
153     my @arr;
154     while (my $row = $sth->fetchrow_hashref) {
155     $row->{item} = HTML::Entities::encode($row->{item},'<>&"');
156     push @arr,$row;
157     }
158     return @arr;
159     }
160    
161     sub close {
162     my $self = shift;
163    
164 dpavlin 94 return if (! $self->{dbh});
165 dpavlin 60
166 dpavlin 94 foreach my $table (keys %Table) {
167     $self->bench("Crating table $table");
168     $self->delete_and_create($table);
169 dpavlin 60
170     $self->{dbh}->begin_work || die $self->{dbh}->errstr();
171    
172 dpavlin 94 $self->bench("Sorting ".$Table{$table}." items in $table");
173     my @keys = sort keys %{$c_table->{$table}};
174    
175     $self->bench("Dumping data into $table");
176     my $sql = "insert into $table (ord,item,count) values (?,?,?)";
177 dpavlin 60 my $sth = $self->{dbh}->prepare($sql) || die "sql: $sql; ".$self->{dbh}->errstr();
178 dpavlin 94
179     my $ord = 0;
180     foreach my $key (@keys) {
181 dpavlin 95 $sth->execute(++$ord,
182 dpavlin 94 $c_table->{$table}->{$key},
183     $c_count->{$table}->{$key}
184     );
185 dpavlin 60 }
186    
187     $self->{dbh}->commit || die $self->{dbh}->errstr();
188     }
189 dpavlin 94 $self->bench("disconnecting from database");
190 dpavlin 60
191 dpavlin 94 $self->{dbh}->disconnect;
192     undef $self->{dbh};
193 dpavlin 60 }
194    
195     END {
196     $Count--;
197     print STDERR "index_DBI fatal error: \$index->close() not called... $Count references left!\n" if ($Count > 0);
198     # FIX: debug output
199     # print STDERR "usage\ttable\n";
200     # foreach (keys %Table) {
201     # print STDERR $Table{$_},"\t$_\n";
202     # }
203     }
204    
205     1;

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