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

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Revision 226 - (hide annotations)
Wed Feb 11 08:33:51 2004 UTC (15 years, 8 months ago) by dpavlin
File size: 6414 byte(s)
added SQLite parametar sqlite_handle_binary_nulls

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     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 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     # 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 dpavlin 60 $index_data = substr($index_data,0,255);
111 dpavlin 93
112 dpavlin 60 my $uc = uc($index_data);
113 dpavlin 94 if (! $c_table->{$field}->{$uc}) {
114 dpavlin 60 #print stderr "in index: $index_data\n";
115 dpavlin 94 $c_table->{$field}->{$uc} = $index_data;
116 dpavlin 188 $c_table->{$field}->{$uc}->{display} = $display;
117 dpavlin 94 $c_count->{$field}->{$uc} = 1;
118 dpavlin 60 } else {
119 dpavlin 94 $c_count->{$field}->{$uc}++;
120 dpavlin 60 }
121     }
122    
123 dpavlin 140 sub count {
124 dpavlin 60 my $self = shift;
125    
126     my $field = shift;
127 dpavlin 140 my $where = shift;
128 dpavlin 60
129 dpavlin 140 my $sql = "select count(*) from $field where upper(item) like upper(?)||'%'";
130 dpavlin 60
131     my $sth = $self->{dbh}->prepare($sql) || die $self->{dbh}->errstr();
132 dpavlin 140 $sth->execute($where) || die "sql: $sql; ".$self->{dbh}->errstr();
133 dpavlin 60
134     my ($total) = $sth->fetchrow_array();
135    
136 dpavlin 142 # 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 dpavlin 60 }
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 dpavlin 188 my $sql = "select item,display,ord from $field";
162 dpavlin 60
163     if ($where) {
164 dpavlin 140 my $sql2 = "select ord from $field where upper(item) like upper(?)||'%'";
165 dpavlin 60 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 dpavlin 127 } else {
171     # if no match is found when searching from beginning
172     # of word in index, try substring match anywhere
173 dpavlin 201 $sql2 = "select ord from $field where upper(item) like '% '||upper(?)||'%'";
174 dpavlin 127 $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 dpavlin 60 }
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 dpavlin 188 $row->{item} = HTML::Entities::encode($row->{item},' <>&"');
188     $row->{display} = HTML::Entities::encode($row->{display},'<>&"');
189 dpavlin 60 push @arr,$row;
190     }
191     return @arr;
192     }
193    
194     sub close {
195     my $self = shift;
196    
197 dpavlin 94 return if (! $self->{dbh});
198 dpavlin 60
199 dpavlin 94 foreach my $table (keys %Table) {
200     $self->bench("Crating table $table");
201     $self->delete_and_create($table);
202 dpavlin 60
203     $self->{dbh}->begin_work || die $self->{dbh}->errstr();
204    
205 dpavlin 219 $self->bench("Sorting ".$Table{$table}." (with duplicates) items in $table");
206 dpavlin 94 my @keys = sort keys %{$c_table->{$table}};
207    
208 dpavlin 219 $self->bench("Dumping ".($#keys+1)." items into $table");
209 dpavlin 188 my $sql = "insert into $table (ord,item,display,count) values (?,?,?,?)";
210 dpavlin 60 my $sth = $self->{dbh}->prepare($sql) || die "sql: $sql; ".$self->{dbh}->errstr();
211 dpavlin 94
212     my $ord = 0;
213     foreach my $key (@keys) {
214 dpavlin 95 $sth->execute(++$ord,
215 dpavlin 94 $c_table->{$table}->{$key},
216 dpavlin 188 $c_table->{$table}->{$key}->{display},
217 dpavlin 94 $c_count->{$table}->{$key}
218     );
219 dpavlin 60 }
220    
221     $self->{dbh}->commit || die $self->{dbh}->errstr();
222     }
223 dpavlin 206
224     if ($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 dpavlin 94 $self->bench("disconnecting from database");
229 dpavlin 60
230 dpavlin 94 $self->{dbh}->disconnect;
231     undef $self->{dbh};
232 dpavlin 60 }
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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