/[webpac]/trunk/index_DBI.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.pm

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Revision 18 - (show annotations)
Sat Feb 22 21:37:25 2003 UTC (16 years, 9 months ago) by dpavlin
File size: 4751 byte(s)
make drop/create table actually work

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

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