/[webpac]/trunk/index_DBI_cache.pm
This is repository of my old source code which isn't updated any more. Go to git.rot13.org for current projects!
ViewVC logotype

Annotation of /trunk/index_DBI_cache.pm

Parent Directory Parent Directory | Revision Log Revision Log


Revision 60 - (hide annotations)
Fri Jul 4 18:23:00 2003 UTC (16 years, 2 months ago) by dpavlin
File size: 5806 byte(s)
uses memory as cache

1 dpavlin 60 #
2     # this file implements index functions using DBI
3     # and huge amounts of memory for cache speedup
4     #
5    
6     package index_DBI;
7     use strict qw(vars);
8     use vars qw($Count);
9     use HTML::Entities;
10    
11     use DBI;
12    
13     my %Table; # index tables which where visited in this run
14     my %sth_cache; # cache prepared statements
15    
16     # cache var
17     my $c_table;
18     my $c_count;
19    
20     sub new {
21     my $class = shift;
22     my $self = {};
23     bless($self, $class);
24    
25     my $dbd = shift || die "need dbi_dbd= in [global] section of configuration file";
26     my $dsn = shift || die "need dbi_dsn= in [global] section of configuration file";
27     my $user = shift || die "need dbi_user= in [global] section of configuration file";
28     my $passwd = shift || die "need dbi_passwd= in [global] section of configuration file";
29    
30     $self->{dbh} = DBI->connect("DBI:$dbd:$dsn",$user,$passwd) || die $DBI::errstr;
31     # begin transaction
32     $self->{dbh}->begin_work || die $self->{dbh}->errstr();
33    
34     $Count++;
35    
36     return $self;
37     }
38    
39     sub delete_and_create {
40     my $self = shift;
41    
42     my $field = shift;
43    
44     #print "#### delete_and_create($field)\n";
45    
46     $self->{dbh}->commit;
47    
48     my $sql = "select count(*) from $field";
49     my $sth = $self->{dbh}->prepare($sql) || die $self->{dbh}->errstr();
50     # FIX: this is not a good way to check if table exists!
51     if ($sth->execute() && $sth->fetchrow_hashref) {
52     my $sql = "drop table $field";
53     $self->{dbh}->begin_work;
54     my $sth = $self->{dbh}->do($sql) || die "SQL: $sql ".$self->{dbh}->errstr();
55     $self->{dbh}->commit;
56     }
57     $sql = "create table $field (
58     item varchar(255),
59     ident varchar(255),
60     count int,
61     ord int,
62     primary key (item,ident)
63     )";
64    
65     $self->{dbh}->begin_work;
66     $sth = $self->{dbh}->do($sql); # || warn "SQL: $sql ".$self->{dbh}->errstr();
67     $self->{dbh}->commit;
68    
69     $self->{dbh}->begin_work;
70     }
71    
72     sub insert {
73     my $self = shift;
74    
75     my $field = shift;
76     my $index_data = shift || print STDERR "\$index->insert($field,NULL,...)";
77     my $ident = shift || ''; # e.g. library id
78    
79     if (! $index_data) {
80     print STDERR "\$index->insert() -- no value to insert\n";
81     return;
82     }
83    
84     if (! $Table{$field}) {
85     $self->delete_and_create($field);
86    
87     my $sql = "select item from $field where upper(item)=upper(?)";
88     $sth_cache{$field."select"} = $self->{dbh}->prepare($sql) || die $self->{dbh}->errstr();
89    
90     $sql = "insert into $field (item,ident,count) values (?,?,?)";
91     $sth_cache{$field."insert"} = $self->{dbh}->prepare($sql) || die $self->{dbh}->errstr();
92    
93     $sql = "update $field set count = count + 1 where item = ? and ident = ?";
94     $sth_cache{$field."update"} = $self->{dbh}->prepare($sql) || die $self->{dbh}->errstr();
95     }
96     $Table{$field}++;
97    
98     #$sth_cache{$field."select"}->execute($index_data) || die "cache: $field select; ".$self->{dbh}->errstr();
99     $index_data = substr($index_data,0,255);
100     my $uc = uc($index_data);
101     if (! $c_table->{$field}->{$ident}->{$uc}) {
102     $sth_cache{$field."insert"}->execute($index_data,$ident,0) || die "cache: $field insert; ".$self->{dbh}->errstr();
103     #print stderr "in index: $index_data\n";
104     $c_table->{$field}->{$ident}->{$uc} = $index_data;
105     $c_count->{$field}->{$ident}->{$uc} = 1;
106     } else {
107     $c_count->{$field}->{$ident}->{$uc}++;
108     }
109     }
110    
111     sub check {
112     my $self = shift;
113    
114     my $field = shift;
115    
116     my $sql = "select count(*) from $field";
117    
118     my $sth = $self->{dbh}->prepare($sql) || die $self->{dbh}->errstr();
119     $sth->execute() || die "sql: $sql; ".$self->{dbh}->errstr();
120    
121     my ($total) = $sth->fetchrow_array();
122    
123     return $total;
124     }
125    
126    
127     sub fetch {
128     my $self = shift;
129    
130     my $field = shift;
131     my $what = shift || 'item'; # 'item,ident'
132     my $where = shift;
133    
134     my $from_ord = shift || 0;
135     my $rows = shift || 10;
136    
137     my @sql_args;
138    
139     my $sql = "select $what,ord from $field";
140    
141     if ($where) {
142     my $sql2 = " select ord from $field where upper($what) like upper(?)||'%'";
143     my $sth = $self->{dbh}->prepare($sql2) || die "sql2: $sql2; ".$self->{dbh}->errstr();
144    
145     $sth->execute($where) || die "sql2: $sql2; ".$self->{dbh}->errstr();
146     if (my $row = $sth->fetchrow_hashref) {
147     $from_ord += $row->{ord} - 1;
148     }
149     }
150     $sql .= " order by ord limit $rows offset $from_ord";
151    
152     my $sth = $self->{dbh}->prepare($sql) || die "prepare: $sql; ".$self->{dbh}->errstr();
153     $sth->execute() || die "execute: $sql; ".$self->{dbh}->errstr();
154     my @arr;
155     while (my $row = $sth->fetchrow_hashref) {
156     $row->{item} = HTML::Entities::encode($row->{item},'<>&"');
157     push @arr,$row;
158     }
159     return @arr;
160     }
161    
162     sub close {
163     my $self = shift;
164    
165    
166     # re-create ord column (sorted order) in table
167     sub create_ord {
168    
169     my $table = shift;
170    
171     $self->{dbh}->begin_work || die $self->{dbh}->errstr();
172    
173     my $sql = "select oid from $table order by upper(item)";
174     my $sth = $self->{dbh}->prepare($sql) || die "sql: $sql; ".$self->{dbh}->errstr();
175     $sql = "update $table set ord=? where oid=?";
176     my $sth_update = $self->{dbh}->prepare($sql) || die "sql: $sql; ".$self->{dbh}->errstr();
177     $sth->execute() || die "sql: $sql; ".$self->{dbh}->errstr();
178     my $ord = 1;
179     while (my $row = $sth->fetchrow_hashref) {
180     $sth_update->execute($ord++,$row->{oid});
181     }
182    
183     $self->{dbh}->commit || die $self->{dbh}->errstr();
184     }
185     #--- end of sub
186    
187     if ($self->{dbh}) {
188    
189     # commit
190     $self->{dbh}->commit || die $self->{dbh}->errstr();
191    
192     foreach my $table (keys %Table) {
193     # FIX
194     print STDERR "creating ord for $table...\n";
195     create_ord($table);
196     undef $sth_cache{$table."select"};
197     undef $sth_cache{$table."insert"};
198     undef $sth_cache{$table."update"};
199     # XXX
200     # $sth_cache{$field."update"}->execute($index_data,$ident) || die "cache: $field update; ".$self->{dbh}->errstr();
201     }
202    
203     $self->{dbh}->disconnect;
204     undef $self->{dbh};
205     }
206     }
207    
208     END {
209     $Count--;
210     print STDERR "index_DBI fatal error: \$index->close() not called... $Count references left!\n" if ($Count > 0);
211     # FIX: debug output
212     # print STDERR "usage\ttable\n";
213     # foreach (keys %Table) {
214     # print STDERR $Table{$_},"\t$_\n";
215     # }
216     }
217    
218     1;

Properties

Name Value
cvs2svn:cvs-rev 1.1

  ViewVC Help
Powered by ViewVC 1.1.26