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

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Revision 19 - (hide annotations)
Sat Feb 22 23:47:15 2003 UTC (16 years, 6 months ago) by dpavlin
File size: 4848 byte(s)
re-arange transactions so that drop/create table work

1 dpavlin 10 #
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 dpavlin 12 use HTML::Entities;
9 dpavlin 10
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 dpavlin 11 $self->{dbh} = DBI->connect("DBI:Pg:dbname=webpac","dpavlin","") || die $DBI::errstr;
21 dpavlin 10 # 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 $field = shift;
33    
34 dpavlin 19 #print "#### delete_and_create($field)\n";
35    
36 dpavlin 10 $self->{dbh}->commit;
37    
38     my $sql = "select count(*) from $field";
39     my $sth = $self->{dbh}->prepare($sql) || die $self->{dbh}->errstr();
40     # FIX: this is not a good way to check if table exists!
41 dpavlin 18 if ($sth->execute() && $sth->fetchrow_hashref) {
42 dpavlin 10 my $sql = "drop table $field";
43 dpavlin 19 $self->{dbh}->begin_work;
44 dpavlin 18 my $sth = $self->{dbh}->do($sql) || die "SQL: $sql ".$self->{dbh}->errstr();
45 dpavlin 19 $self->{dbh}->commit;
46 dpavlin 10 }
47     $sql = "create table $field (
48     item varchar(255),
49     ident varchar(255),
50     count int,
51 dpavlin 12 ord int,
52 dpavlin 10 primary key (item,ident)
53     )";
54 dpavlin 19
55     $self->{dbh}->begin_work;
56 dpavlin 18 $sth = $self->{dbh}->do($sql); # || warn "SQL: $sql ".$self->{dbh}->errstr();
57 dpavlin 19 $self->{dbh}->commit;
58 dpavlin 10
59     $self->{dbh}->begin_work;
60     }
61    
62     sub insert {
63     my $self = shift;
64    
65     my $field = shift;
66 dpavlin 18 my $index_data = shift || print STDERR "\$index->insert($field,NULL,...)";
67     my $ident = shift || ''; # e.g. library id
68 dpavlin 10
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 dpavlin 11 $sth->execute($index_data) || die "sql: $sql; ".$self->{dbh}->errstr();
82 dpavlin 10 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 dpavlin 11 $sth->execute($index_data,$ident,1) || die "sql: $sql; ".$self->{dbh}->errstr();
86     #print stderr "in index: $index_data\n";
87 dpavlin 10 } 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 dpavlin 11 $sth->execute($index_data,$ident) || die "sql: $sql; ".$self->{dbh}->errstr();
91 dpavlin 10 }
92     }
93    
94 dpavlin 11 sub check {
95     my $self = shift;
96    
97     my $field = shift;
98    
99     my $sql = "select count(*) from $field";
100 dpavlin 12
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 dpavlin 11 }
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 dpavlin 12 my $from_ord = shift || 0;
118     my $rows = shift || 10;
119    
120 dpavlin 11 my @sql_args;
121    
122 dpavlin 13 my $sql = "select $what,ord from $field";
123 dpavlin 12
124 dpavlin 11 if ($where) {
125 dpavlin 12 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 dpavlin 13 $from_ord += $row->{ord} - 1;
131 dpavlin 12 }
132 dpavlin 11 }
133 dpavlin 12 $sql .= " order by ord limit $rows offset $from_ord";
134 dpavlin 11
135 dpavlin 12 my $sth = $self->{dbh}->prepare($sql) || die "prepare: $sql; ".$self->{dbh}->errstr();
136     $sth->execute() || die "execute: $sql; ".$self->{dbh}->errstr();
137 dpavlin 11 my @arr;
138     while (my $row = $sth->fetchrow_hashref) {
139 dpavlin 12 $row->{item} = HTML::Entities::encode($row->{item});
140 dpavlin 11 push @arr,$row;
141     }
142     return @arr;
143     }
144    
145 dpavlin 10 sub close {
146     my $self = shift;
147    
148 dpavlin 12
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 $self->{dbh}->errstr();
167     }
168     #--- end of sub
169    
170 dpavlin 10 if ($self->{dbh}) {
171 dpavlin 12
172     # commit
173 dpavlin 10 $self->{dbh}->commit || die $self->{dbh}->errstr();
174 dpavlin 12
175     foreach my $table (keys %Table) {
176     # FIX
177     print STDERR "creating ord for $table...\n";
178     create_ord($table);
179     }
180    
181 dpavlin 10 $self->{dbh}->disconnect;
182     undef $self->{dbh};
183     }
184     }
185    
186     END {
187     $Count--;
188 dpavlin 11 print STDERR "index_DBI fatal error: \$index->close() not called... $Count references left!\n" if ($Count > 0);
189 dpavlin 10 # FIX: debug output
190 dpavlin 11 # print STDERR "usage\ttable\n";
191     # foreach (keys %Table) {
192     # print STDERR $Table{$_},"\t$_\n";
193     # }
194 dpavlin 10 }
195    
196     1;

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