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

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Revision 201 - (hide annotations)
Sat Jan 17 14:00:26 2004 UTC (15 years, 10 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 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     $self->{dbh} = DBI->connect("DBI:$dbd:$dsn",$user,$passwd) || die $DBI::errstr;
48     $Count++;
49    
50 dpavlin 94 $self->bench("connected to $dbd as $user");
51    
52 dpavlin 60 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 dpavlin 188 display text,
72 dpavlin 60 count int,
73     ord int,
74 dpavlin 94 primary key (item)
75 dpavlin 60 )";
76    
77 dpavlin 94 $sth = $self->{dbh}->do($sql) || warn "SQL: $sql ".$self->{dbh}->errstr();
78 dpavlin 60 }
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 dpavlin 188 my $display = shift || $index_data;
86 dpavlin 60
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 dpavlin 93
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 dpavlin 60 $index_data = substr($index_data,0,255);
102 dpavlin 93
103 dpavlin 60 my $uc = uc($index_data);
104 dpavlin 94 if (! $c_table->{$field}->{$uc}) {
105 dpavlin 60 #print stderr "in index: $index_data\n";
106 dpavlin 94 $c_table->{$field}->{$uc} = $index_data;
107 dpavlin 188 $c_table->{$field}->{$uc}->{display} = $display;
108 dpavlin 94 $c_count->{$field}->{$uc} = 1;
109 dpavlin 60 } else {
110 dpavlin 94 $c_count->{$field}->{$uc}++;
111 dpavlin 60 }
112     }
113    
114 dpavlin 140 sub count {
115 dpavlin 60 my $self = shift;
116    
117     my $field = shift;
118 dpavlin 140 my $where = shift;
119 dpavlin 60
120 dpavlin 140 my $sql = "select count(*) from $field where upper(item) like upper(?)||'%'";
121 dpavlin 60
122     my $sth = $self->{dbh}->prepare($sql) || die $self->{dbh}->errstr();
123 dpavlin 140 $sth->execute($where) || die "sql: $sql; ".$self->{dbh}->errstr();
124 dpavlin 60
125     my ($total) = $sth->fetchrow_array();
126    
127 dpavlin 142 # 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 dpavlin 60 }
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 dpavlin 188 my $sql = "select item,display,ord from $field";
153 dpavlin 60
154     if ($where) {
155 dpavlin 140 my $sql2 = "select ord from $field where upper(item) like upper(?)||'%'";
156 dpavlin 60 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 dpavlin 127 } else {
162     # if no match is found when searching from beginning
163     # of word in index, try substring match anywhere
164 dpavlin 201 $sql2 = "select ord from $field where upper(item) like '% '||upper(?)||'%'";
165 dpavlin 127 $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 dpavlin 60 }
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 dpavlin 188 $row->{item} = HTML::Entities::encode($row->{item},' <>&"');
179     $row->{display} = HTML::Entities::encode($row->{display},'<>&"');
180 dpavlin 60 push @arr,$row;
181     }
182     return @arr;
183     }
184    
185     sub close {
186     my $self = shift;
187    
188 dpavlin 94 return if (! $self->{dbh});
189 dpavlin 60
190 dpavlin 94 foreach my $table (keys %Table) {
191     $self->bench("Crating table $table");
192     $self->delete_and_create($table);
193 dpavlin 60
194     $self->{dbh}->begin_work || die $self->{dbh}->errstr();
195    
196 dpavlin 94 $self->bench("Sorting ".$Table{$table}." items in $table");
197     my @keys = sort keys %{$c_table->{$table}};
198    
199     $self->bench("Dumping data into $table");
200 dpavlin 188 my $sql = "insert into $table (ord,item,display,count) values (?,?,?,?)";
201 dpavlin 60 my $sth = $self->{dbh}->prepare($sql) || die "sql: $sql; ".$self->{dbh}->errstr();
202 dpavlin 94
203     my $ord = 0;
204     foreach my $key (@keys) {
205 dpavlin 95 $sth->execute(++$ord,
206 dpavlin 94 $c_table->{$table}->{$key},
207 dpavlin 188 $c_table->{$table}->{$key}->{display},
208 dpavlin 94 $c_count->{$table}->{$key}
209     );
210 dpavlin 60 }
211    
212     $self->{dbh}->commit || die $self->{dbh}->errstr();
213     }
214 dpavlin 94 $self->bench("disconnecting from database");
215 dpavlin 60
216 dpavlin 94 $self->{dbh}->disconnect;
217     undef $self->{dbh};
218 dpavlin 60 }
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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