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

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Revision 88 - (hide annotations)
Sat Jul 12 16:02:15 2003 UTC (16 years, 5 months ago) by dpavlin
File size: 5932 byte(s)
print timings of last operation

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     $index_data = substr($index_data,0,255);
103     my $uc = uc($index_data);
104     if (! $c_table->{$field}->{$ident}->{$uc}) {
105 dpavlin 83 $sth_cache{$field."insert"}->execute($index_data,$ident,0) || warn "cache: $field insert ($index_data,$ident); ".$self->{dbh}->errstr();
106 dpavlin 60 #print stderr "in index: $index_data\n";
107     $c_table->{$field}->{$ident}->{$uc} = $index_data;
108     $c_count->{$field}->{$ident}->{$uc} = 1;
109     } else {
110     $c_count->{$field}->{$ident}->{$uc}++;
111     }
112     }
113    
114     sub check {
115     my $self = shift;
116    
117     my $field = shift;
118    
119     my $sql = "select count(*) from $field";
120    
121     my $sth = $self->{dbh}->prepare($sql) || die $self->{dbh}->errstr();
122     $sth->execute() || die "sql: $sql; ".$self->{dbh}->errstr();
123    
124     my ($total) = $sth->fetchrow_array();
125    
126     return $total;
127     }
128    
129    
130     sub fetch {
131     my $self = shift;
132    
133     my $field = shift;
134     my $what = shift || 'item'; # 'item,ident'
135     my $where = shift;
136    
137     my $from_ord = shift || 0;
138     my $rows = shift || 10;
139    
140     my @sql_args;
141    
142     my $sql = "select $what,ord from $field";
143    
144     if ($where) {
145     my $sql2 = " select ord from $field where upper($what) like upper(?)||'%'";
146     my $sth = $self->{dbh}->prepare($sql2) || die "sql2: $sql2; ".$self->{dbh}->errstr();
147    
148     $sth->execute($where) || die "sql2: $sql2; ".$self->{dbh}->errstr();
149     if (my $row = $sth->fetchrow_hashref) {
150     $from_ord += $row->{ord} - 1;
151     }
152     }
153     $sql .= " order by ord limit $rows offset $from_ord";
154    
155     my $sth = $self->{dbh}->prepare($sql) || die "prepare: $sql; ".$self->{dbh}->errstr();
156     $sth->execute() || die "execute: $sql; ".$self->{dbh}->errstr();
157     my @arr;
158     while (my $row = $sth->fetchrow_hashref) {
159     $row->{item} = HTML::Entities::encode($row->{item},'<>&"');
160     push @arr,$row;
161     }
162     return @arr;
163     }
164    
165     sub close {
166     my $self = shift;
167    
168    
169     # re-create ord column (sorted order) in table
170     sub create_ord {
171    
172     my $table = shift;
173    
174     $self->{dbh}->begin_work || die $self->{dbh}->errstr();
175    
176     my $sql = "select oid from $table order by upper(item)";
177     my $sth = $self->{dbh}->prepare($sql) || die "sql: $sql; ".$self->{dbh}->errstr();
178     $sql = "update $table set ord=? where oid=?";
179     my $sth_update = $self->{dbh}->prepare($sql) || die "sql: $sql; ".$self->{dbh}->errstr();
180     $sth->execute() || die "sql: $sql; ".$self->{dbh}->errstr();
181     my $ord = 1;
182     while (my $row = $sth->fetchrow_hashref) {
183     $sth_update->execute($ord++,$row->{oid});
184     }
185    
186     $self->{dbh}->commit || die $self->{dbh}->errstr();
187     }
188     #--- end of sub
189    
190     if ($self->{dbh}) {
191    
192     # commit
193     $self->{dbh}->commit || die $self->{dbh}->errstr();
194    
195     foreach my $table (keys %Table) {
196     # FIX
197 dpavlin 88 print STDERR "last operation took ",time()-$t," seconds...\n";
198     $t=time();
199 dpavlin 60 print STDERR "creating ord for $table...\n";
200     create_ord($table);
201     undef $sth_cache{$table."select"};
202     undef $sth_cache{$table."insert"};
203     undef $sth_cache{$table."update"};
204     # XXX
205     # $sth_cache{$field."update"}->execute($index_data,$ident) || die "cache: $field update; ".$self->{dbh}->errstr();
206     }
207    
208     $self->{dbh}->disconnect;
209     undef $self->{dbh};
210     }
211     }
212    
213     END {
214     $Count--;
215     print STDERR "index_DBI fatal error: \$index->close() not called... $Count references left!\n" if ($Count > 0);
216     # FIX: debug output
217     # print STDERR "usage\ttable\n";
218     # foreach (keys %Table) {
219     # print STDERR $Table{$_},"\t$_\n";
220     # }
221     }
222    
223     1;

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