/[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!
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Contents of /trunk/index_DBI_cache.pm

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Revision 83 - (show annotations)
Fri Jul 11 20:14:19 2003 UTC (16 years, 5 months ago) by dpavlin
File size: 5828 byte(s)
don't die if unable to insert into index, instead just warn

1 #
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) || warn "cache: $field insert ($index_data,$ident); ".$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;

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