/[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 19 - (show annotations)
Sat Feb 22 23:47:15 2003 UTC (16 years, 7 months ago) by dpavlin
File size: 4848 byte(s)
re-arange transactions so that drop/create table 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 $field = shift;
33
34 #print "#### delete_and_create($field)\n";
35
36 $self->{dbh}->commit;
37
38 my $sql = "select count(*) from $field";
39 my $sth = $self->{dbh}->prepare($sql) || die $self->{dbh}->errstr();
40 # FIX: this is not a good way to check if table exists!
41 if ($sth->execute() && $sth->fetchrow_hashref) {
42 my $sql = "drop table $field";
43 $self->{dbh}->begin_work;
44 my $sth = $self->{dbh}->do($sql) || die "SQL: $sql ".$self->{dbh}->errstr();
45 $self->{dbh}->commit;
46 }
47 $sql = "create table $field (
48 item varchar(255),
49 ident varchar(255),
50 count int,
51 ord int,
52 primary key (item,ident)
53 )";
54
55 $self->{dbh}->begin_work;
56 $sth = $self->{dbh}->do($sql); # || warn "SQL: $sql ".$self->{dbh}->errstr();
57 $self->{dbh}->commit;
58
59 $self->{dbh}->begin_work;
60 }
61
62 sub insert {
63 my $self = shift;
64
65 my $field = shift;
66 my $index_data = shift || print STDERR "\$index->insert($field,NULL,...)";
67 my $ident = shift || ''; # e.g. library id
68
69 if (! $index_data) {
70 print STDERR "\$index->insert() -- no value to insert\n";
71 return;
72 }
73
74 if (! $Table{$field}) {
75 $self->delete_and_create($field);
76 }
77 $Table{$field}++;
78
79 my $sql = "select item from $field where upper(item)=upper(?)";
80 my $sth = $self->{dbh}->prepare($sql) || die $self->{dbh}->errstr();
81 $sth->execute($index_data) || die "sql: $sql; ".$self->{dbh}->errstr();
82 if (! $sth->fetchrow_hashref) {
83 my $sql = "insert into $field (item,ident,count) values (?,?,?)";
84 my $sth = $self->{dbh}->prepare($sql) || die $self->{dbh}->errstr();
85 $sth->execute($index_data,$ident,1) || die "sql: $sql; ".$self->{dbh}->errstr();
86 #print stderr "in index: $index_data\n";
87 } else {
88 my $sql = "update $field set count = count + 1 where item = ? and ident = ?";
89 my $sth = $self->{dbh}->prepare($sql) || die $self->{dbh}->errstr();
90 $sth->execute($index_data,$ident) || die "sql: $sql; ".$self->{dbh}->errstr();
91 }
92 }
93
94 sub check {
95 my $self = shift;
96
97 my $field = shift;
98
99 my $sql = "select count(*) from $field";
100
101 my $sth = $self->{dbh}->prepare($sql) || die $self->{dbh}->errstr();
102 $sth->execute() || die "sql: $sql; ".$self->{dbh}->errstr();
103
104 my ($total) = $sth->fetchrow_array();
105
106 return $total;
107 }
108
109
110 sub fetch {
111 my $self = shift;
112
113 my $field = shift;
114 my $what = shift || 'item'; # 'item,ident'
115 my $where = shift;
116
117 my $from_ord = shift || 0;
118 my $rows = shift || 10;
119
120 my @sql_args;
121
122 my $sql = "select $what,ord from $field";
123
124 if ($where) {
125 my $sql2 = " select ord from $field where upper($what) like upper(?)||'%'";
126 my $sth = $self->{dbh}->prepare($sql2) || die "sql2: $sql2; ".$self->{dbh}->errstr();
127
128 $sth->execute($where) || die "sql2: $sql2; ".$self->{dbh}->errstr();
129 if (my $row = $sth->fetchrow_hashref) {
130 $from_ord += $row->{ord} - 1;
131 }
132 }
133 $sql .= " order by ord limit $rows offset $from_ord";
134
135 my $sth = $self->{dbh}->prepare($sql) || die "prepare: $sql; ".$self->{dbh}->errstr();
136 $sth->execute() || die "execute: $sql; ".$self->{dbh}->errstr();
137 my @arr;
138 while (my $row = $sth->fetchrow_hashref) {
139 $row->{item} = HTML::Entities::encode($row->{item});
140 push @arr,$row;
141 }
142 return @arr;
143 }
144
145 sub close {
146 my $self = shift;
147
148
149 # re-create ord column (sorted order) in table
150 sub create_ord {
151
152 my $table = shift;
153
154 $self->{dbh}->begin_work || die $self->{dbh}->errstr();
155
156 my $sql = "select oid from $table order by item";
157 my $sth = $self->{dbh}->prepare($sql) || die "sql: $sql; ".$self->{dbh}->errstr();
158 $sql = "update $table set ord=? where oid=?";
159 my $sth_update = $self->{dbh}->prepare($sql) || die "sql: $sql; ".$self->{dbh}->errstr();
160 $sth->execute() || die "sql: $sql; ".$self->{dbh}->errstr();
161 my $ord = 1;
162 while (my $row = $sth->fetchrow_hashref) {
163 $sth_update->execute($ord++,$row->{oid});
164 }
165
166 $self->{dbh}->commit || die $self->{dbh}->errstr();
167 }
168 #--- end of sub
169
170 if ($self->{dbh}) {
171
172 # commit
173 $self->{dbh}->commit || die $self->{dbh}->errstr();
174
175 foreach my $table (keys %Table) {
176 # FIX
177 print STDERR "creating ord for $table...\n";
178 create_ord($table);
179 }
180
181 $self->{dbh}->disconnect;
182 undef $self->{dbh};
183 }
184 }
185
186 END {
187 $Count--;
188 print STDERR "index_DBI fatal error: \$index->close() not called... $Count references left!\n" if ($Count > 0);
189 # FIX: debug output
190 # print STDERR "usage\ttable\n";
191 # foreach (keys %Table) {
192 # print STDERR $Table{$_},"\t$_\n";
193 # }
194 }
195
196 1;

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