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

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Revision 93 - (hide annotations)
Sun Jul 13 14:44:03 2003 UTC (16 years, 5 months ago) by dpavlin
File size: 6155 byte(s)
fix OpenIsis 0.9.0 perl bug

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 dpavlin 88 # bench time
21     my $t = time();
22    
23 dpavlin 60 sub new {
24     my $class = shift;
25     my $self = {};
26     bless($self, $class);
27    
28     my $dbd = shift || die "need dbi_dbd= in [global] section of configuration file";
29     my $dsn = shift || die "need dbi_dsn= in [global] section of configuration file";
30     my $user = shift || die "need dbi_user= in [global] section of configuration file";
31     my $passwd = shift || die "need dbi_passwd= in [global] section of configuration file";
32    
33     $self->{dbh} = DBI->connect("DBI:$dbd:$dsn",$user,$passwd) || die $DBI::errstr;
34     # begin transaction
35     $self->{dbh}->begin_work || die $self->{dbh}->errstr();
36    
37     $Count++;
38    
39     return $self;
40     }
41    
42     sub delete_and_create {
43     my $self = shift;
44    
45     my $field = shift;
46    
47     #print "#### delete_and_create($field)\n";
48    
49     $self->{dbh}->commit;
50    
51     my $sql = "select count(*) from $field";
52     my $sth = $self->{dbh}->prepare($sql) || die $self->{dbh}->errstr();
53     # FIX: this is not a good way to check if table exists!
54     if ($sth->execute() && $sth->fetchrow_hashref) {
55     my $sql = "drop table $field";
56     $self->{dbh}->begin_work;
57     my $sth = $self->{dbh}->do($sql) || die "SQL: $sql ".$self->{dbh}->errstr();
58     $self->{dbh}->commit;
59     }
60     $sql = "create table $field (
61     item varchar(255),
62     ident varchar(255),
63     count int,
64     ord int,
65     primary key (item,ident)
66     )";
67    
68     $self->{dbh}->begin_work;
69     $sth = $self->{dbh}->do($sql); # || warn "SQL: $sql ".$self->{dbh}->errstr();
70     $self->{dbh}->commit;
71    
72     $self->{dbh}->begin_work;
73     }
74    
75     sub insert {
76     my $self = shift;
77    
78     my $field = shift;
79     my $index_data = shift || print STDERR "\$index->insert($field,NULL,...)";
80     my $ident = shift || ''; # e.g. library id
81    
82     if (! $index_data) {
83     print STDERR "\$index->insert() -- no value to insert\n";
84     return;
85     }
86    
87     if (! $Table{$field}) {
88     $self->delete_and_create($field);
89    
90     my $sql = "select item from $field where upper(item)=upper(?)";
91     $sth_cache{$field."select"} = $self->{dbh}->prepare($sql) || die $self->{dbh}->errstr();
92    
93     $sql = "insert into $field (item,ident,count) values (?,?,?)";
94     $sth_cache{$field."insert"} = $self->{dbh}->prepare($sql) || die $self->{dbh}->errstr();
95    
96     $sql = "update $field set count = count + 1 where item = ? and ident = ?";
97     $sth_cache{$field."update"} = $self->{dbh}->prepare($sql) || die $self->{dbh}->errstr();
98     }
99     $Table{$field}++;
100    
101     #$sth_cache{$field."select"}->execute($index_data) || die "cache: $field select; ".$self->{dbh}->errstr();
102 dpavlin 93
103     # XXX for some strange reason, it seems that some entries in my
104     # database produce strings which start with null byte. I suspect
105     # this to be bug in OpenIsis 0.9.0.
106     # This should fix it..
107     $index_data =~ s/^[^\w]+//;
108 dpavlin 60 $index_data = substr($index_data,0,255);
109 dpavlin 93
110 dpavlin 60 my $uc = uc($index_data);
111     if (! $c_table->{$field}->{$ident}->{$uc}) {
112 dpavlin 83 $sth_cache{$field."insert"}->execute($index_data,$ident,0) || warn "cache: $field insert ($index_data,$ident); ".$self->{dbh}->errstr();
113 dpavlin 60 #print stderr "in index: $index_data\n";
114     $c_table->{$field}->{$ident}->{$uc} = $index_data;
115     $c_count->{$field}->{$ident}->{$uc} = 1;
116     } else {
117     $c_count->{$field}->{$ident}->{$uc}++;
118     }
119     }
120    
121     sub check {
122     my $self = shift;
123    
124     my $field = shift;
125    
126     my $sql = "select count(*) from $field";
127    
128     my $sth = $self->{dbh}->prepare($sql) || die $self->{dbh}->errstr();
129     $sth->execute() || die "sql: $sql; ".$self->{dbh}->errstr();
130    
131     my ($total) = $sth->fetchrow_array();
132    
133     return $total;
134     }
135    
136    
137     sub fetch {
138     my $self = shift;
139    
140     my $field = shift;
141     my $what = shift || 'item'; # 'item,ident'
142     my $where = shift;
143    
144     my $from_ord = shift || 0;
145     my $rows = shift || 10;
146    
147     my @sql_args;
148    
149     my $sql = "select $what,ord from $field";
150    
151     if ($where) {
152     my $sql2 = " select ord from $field where upper($what) like upper(?)||'%'";
153     my $sth = $self->{dbh}->prepare($sql2) || die "sql2: $sql2; ".$self->{dbh}->errstr();
154    
155     $sth->execute($where) || die "sql2: $sql2; ".$self->{dbh}->errstr();
156     if (my $row = $sth->fetchrow_hashref) {
157     $from_ord += $row->{ord} - 1;
158     }
159     }
160     $sql .= " order by ord limit $rows offset $from_ord";
161    
162     my $sth = $self->{dbh}->prepare($sql) || die "prepare: $sql; ".$self->{dbh}->errstr();
163     $sth->execute() || die "execute: $sql; ".$self->{dbh}->errstr();
164     my @arr;
165     while (my $row = $sth->fetchrow_hashref) {
166     $row->{item} = HTML::Entities::encode($row->{item},'<>&"');
167     push @arr,$row;
168     }
169     return @arr;
170     }
171    
172     sub close {
173     my $self = shift;
174    
175    
176     # re-create ord column (sorted order) in table
177     sub create_ord {
178    
179     my $table = shift;
180    
181     $self->{dbh}->begin_work || die $self->{dbh}->errstr();
182    
183     my $sql = "select oid from $table order by upper(item)";
184     my $sth = $self->{dbh}->prepare($sql) || die "sql: $sql; ".$self->{dbh}->errstr();
185     $sql = "update $table set ord=? where oid=?";
186     my $sth_update = $self->{dbh}->prepare($sql) || die "sql: $sql; ".$self->{dbh}->errstr();
187     $sth->execute() || die "sql: $sql; ".$self->{dbh}->errstr();
188     my $ord = 1;
189     while (my $row = $sth->fetchrow_hashref) {
190     $sth_update->execute($ord++,$row->{oid});
191     }
192    
193     $self->{dbh}->commit || die $self->{dbh}->errstr();
194     }
195     #--- end of sub
196    
197     if ($self->{dbh}) {
198    
199     # commit
200     $self->{dbh}->commit || die $self->{dbh}->errstr();
201    
202     foreach my $table (keys %Table) {
203     # FIX
204 dpavlin 88 print STDERR "last operation took ",time()-$t," seconds...\n";
205     $t=time();
206 dpavlin 60 print STDERR "creating ord for $table...\n";
207     create_ord($table);
208     undef $sth_cache{$table."select"};
209     undef $sth_cache{$table."insert"};
210     undef $sth_cache{$table."update"};
211     # XXX
212     # $sth_cache{$field."update"}->execute($index_data,$ident) || die "cache: $field update; ".$self->{dbh}->errstr();
213     }
214    
215     $self->{dbh}->disconnect;
216     undef $self->{dbh};
217     }
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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