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

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Revision 50 - (hide annotations)
Sun Jun 1 13:46:42 2003 UTC (16 years, 3 months ago) by dpavlin
File size: 5559 byte(s)
move database arguments to .conf file

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 dpavlin 45 my %sth_cache; # cache prepared statements
14 dpavlin 10
15     sub new {
16     my $class = shift;
17     my $self = {};
18     bless($self, $class);
19    
20 dpavlin 50 my $dbd = shift || die "need dbi_dbd= in [global] section of configuration file";
21     my $dsn = shift || die "need dbi_dsn= in [global] section of configuration file";
22     my $user = shift || die "need dbi_user= in [global] section of configuration file";
23     my $passwd = shift || die "need dbi_passwd= in [global] section of configuration file";
24    
25     $self->{dbh} = DBI->connect("DBI:$dbd:$dsn",$user,$passwd) || die $DBI::errstr;
26 dpavlin 10 # begin transaction
27     $self->{dbh}->begin_work || die $self->{dbh}->errstr();
28    
29     $Count++;
30    
31     return $self;
32     }
33    
34     sub delete_and_create {
35     my $self = shift;
36    
37     my $field = shift;
38    
39 dpavlin 19 #print "#### delete_and_create($field)\n";
40    
41 dpavlin 10 $self->{dbh}->commit;
42    
43     my $sql = "select count(*) from $field";
44     my $sth = $self->{dbh}->prepare($sql) || die $self->{dbh}->errstr();
45     # FIX: this is not a good way to check if table exists!
46 dpavlin 18 if ($sth->execute() && $sth->fetchrow_hashref) {
47 dpavlin 10 my $sql = "drop table $field";
48 dpavlin 19 $self->{dbh}->begin_work;
49 dpavlin 18 my $sth = $self->{dbh}->do($sql) || die "SQL: $sql ".$self->{dbh}->errstr();
50 dpavlin 19 $self->{dbh}->commit;
51 dpavlin 10 }
52     $sql = "create table $field (
53     item varchar(255),
54     ident varchar(255),
55     count int,
56 dpavlin 12 ord int,
57 dpavlin 10 primary key (item,ident)
58     )";
59 dpavlin 19
60     $self->{dbh}->begin_work;
61 dpavlin 18 $sth = $self->{dbh}->do($sql); # || warn "SQL: $sql ".$self->{dbh}->errstr();
62 dpavlin 19 $self->{dbh}->commit;
63 dpavlin 10
64     $self->{dbh}->begin_work;
65     }
66    
67     sub insert {
68     my $self = shift;
69    
70     my $field = shift;
71 dpavlin 18 my $index_data = shift || print STDERR "\$index->insert($field,NULL,...)";
72     my $ident = shift || ''; # e.g. library id
73 dpavlin 10
74     if (! $index_data) {
75     print STDERR "\$index->insert() -- no value to insert\n";
76     return;
77     }
78    
79     if (! $Table{$field}) {
80     $self->delete_and_create($field);
81 dpavlin 45
82     my $sql = "select item from $field where upper(item)=upper(?)";
83     $sth_cache{$field."select"} = $self->{dbh}->prepare($sql) || die $self->{dbh}->errstr();
84    
85     $sql = "insert into $field (item,ident,count) values (?,?,?)";
86     $sth_cache{$field."insert"} = $self->{dbh}->prepare($sql) || die $self->{dbh}->errstr();
87    
88     $sql = "update $field set count = count + 1 where item = ? and ident = ?";
89     $sth_cache{$field."update"} = $self->{dbh}->prepare($sql) || die $self->{dbh}->errstr();
90 dpavlin 10 }
91     $Table{$field}++;
92    
93 dpavlin 45 $sth_cache{$field."select"}->execute($index_data) || die "cache: $field select; ".$self->{dbh}->errstr();
94     if (! $sth_cache{$field."select"}->fetchrow_hashref) {
95 dpavlin 28 $index_data = substr($index_data,0,255);
96 dpavlin 45 $sth_cache{$field."insert"}->execute($index_data,$ident,1) || die "cache: $field insert; ".$self->{dbh}->errstr();
97 dpavlin 11 #print stderr "in index: $index_data\n";
98 dpavlin 10 } else {
99 dpavlin 45 $sth_cache{$field."update"}->execute($index_data,$ident) || die "cache: $field update; ".$self->{dbh}->errstr();
100 dpavlin 10 }
101     }
102    
103 dpavlin 11 sub check {
104     my $self = shift;
105    
106     my $field = shift;
107    
108     my $sql = "select count(*) from $field";
109 dpavlin 12
110     my $sth = $self->{dbh}->prepare($sql) || die $self->{dbh}->errstr();
111     $sth->execute() || die "sql: $sql; ".$self->{dbh}->errstr();
112    
113     my ($total) = $sth->fetchrow_array();
114    
115     return $total;
116 dpavlin 11 }
117    
118    
119     sub fetch {
120     my $self = shift;
121    
122     my $field = shift;
123     my $what = shift || 'item'; # 'item,ident'
124     my $where = shift;
125    
126 dpavlin 12 my $from_ord = shift || 0;
127     my $rows = shift || 10;
128    
129 dpavlin 11 my @sql_args;
130    
131 dpavlin 13 my $sql = "select $what,ord from $field";
132 dpavlin 12
133 dpavlin 11 if ($where) {
134 dpavlin 12 my $sql2 = " select ord from $field where upper($what) like upper(?)||'%'";
135     my $sth = $self->{dbh}->prepare($sql2) || die "sql2: $sql2; ".$self->{dbh}->errstr();
136    
137     $sth->execute($where) || die "sql2: $sql2; ".$self->{dbh}->errstr();
138     if (my $row = $sth->fetchrow_hashref) {
139 dpavlin 13 $from_ord += $row->{ord} - 1;
140 dpavlin 12 }
141 dpavlin 11 }
142 dpavlin 12 $sql .= " order by ord limit $rows offset $from_ord";
143 dpavlin 11
144 dpavlin 12 my $sth = $self->{dbh}->prepare($sql) || die "prepare: $sql; ".$self->{dbh}->errstr();
145     $sth->execute() || die "execute: $sql; ".$self->{dbh}->errstr();
146 dpavlin 11 my @arr;
147     while (my $row = $sth->fetchrow_hashref) {
148 dpavlin 37 $row->{item} = HTML::Entities::encode($row->{item},'<>&"');
149 dpavlin 11 push @arr,$row;
150     }
151     return @arr;
152     }
153    
154 dpavlin 10 sub close {
155     my $self = shift;
156    
157 dpavlin 12
158     # re-create ord column (sorted order) in table
159     sub create_ord {
160    
161     my $table = shift;
162    
163     $self->{dbh}->begin_work || die $self->{dbh}->errstr();
164    
165 dpavlin 28 my $sql = "select oid from $table order by upper(item)";
166 dpavlin 12 my $sth = $self->{dbh}->prepare($sql) || die "sql: $sql; ".$self->{dbh}->errstr();
167     $sql = "update $table set ord=? where oid=?";
168     my $sth_update = $self->{dbh}->prepare($sql) || die "sql: $sql; ".$self->{dbh}->errstr();
169     $sth->execute() || die "sql: $sql; ".$self->{dbh}->errstr();
170     my $ord = 1;
171     while (my $row = $sth->fetchrow_hashref) {
172     $sth_update->execute($ord++,$row->{oid});
173     }
174    
175     $self->{dbh}->commit || die $self->{dbh}->errstr();
176     }
177     #--- end of sub
178    
179 dpavlin 10 if ($self->{dbh}) {
180 dpavlin 12
181     # commit
182 dpavlin 10 $self->{dbh}->commit || die $self->{dbh}->errstr();
183 dpavlin 12
184     foreach my $table (keys %Table) {
185     # FIX
186     print STDERR "creating ord for $table...\n";
187     create_ord($table);
188 dpavlin 50 undef $sth_cache{$table."select"};
189     undef $sth_cache{$table."insert"};
190     undef $sth_cache{$table."update"};
191 dpavlin 12 }
192    
193 dpavlin 10 $self->{dbh}->disconnect;
194     undef $self->{dbh};
195     }
196     }
197    
198     END {
199     $Count--;
200 dpavlin 11 print STDERR "index_DBI fatal error: \$index->close() not called... $Count references left!\n" if ($Count > 0);
201 dpavlin 10 # FIX: debug output
202 dpavlin 11 # print STDERR "usage\ttable\n";
203     # foreach (keys %Table) {
204     # print STDERR $Table{$_},"\t$_\n";
205     # }
206 dpavlin 10 }
207    
208     1;

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