2 # this file implements index functions using DBI
12 my %Table; # index tables which where visited in this run
13 my %sth_cache; # cache prepared statements
21 $self->{dbh} = DBI->connect("DBI:Pg:dbname=webpac","dpavlin","") || die $DBI::errstr;
23 $self->{dbh}->begin_work || die $self->{dbh}->errstr();
30 sub delete_and_create {
35 #print "#### delete_and_create($field)\n";
39 my $sql = "select count(*) from $field";
40 my $sth = $self->{dbh}->prepare($sql) || die $self->{dbh}->errstr();
41 # FIX: this is not a good way to check if table exists!
42 if ($sth->execute() && $sth->fetchrow_hashref) {
43 my $sql = "drop table $field";
44 $self->{dbh}->begin_work;
45 my $sth = $self->{dbh}->do($sql) || die "SQL: $sql ".$self->{dbh}->errstr();
48 $sql = "create table $field (
53 primary key (item,ident)
56 $self->{dbh}->begin_work;
57 $sth = $self->{dbh}->do($sql); # || warn "SQL: $sql ".$self->{dbh}->errstr();
60 $self->{dbh}->begin_work;
67 my $index_data = shift || print STDERR "\$index->insert($field,NULL,...)";
68 my $ident = shift || ''; # e.g. library id
71 print STDERR "\$index->insert() -- no value to insert\n";
75 if (! $Table{$field}) {
76 $self->delete_and_create($field);
78 my $sql = "select item from $field where upper(item)=upper(?)";
79 $sth_cache{$field."select"} = $self->{dbh}->prepare($sql) || die $self->{dbh}->errstr();
81 $sql = "insert into $field (item,ident,count) values (?,?,?)";
82 $sth_cache{$field."insert"} = $self->{dbh}->prepare($sql) || die $self->{dbh}->errstr();
84 $sql = "update $field set count = count + 1 where item = ? and ident = ?";
85 $sth_cache{$field."update"} = $self->{dbh}->prepare($sql) || die $self->{dbh}->errstr();
89 $sth_cache{$field."select"}->execute($index_data) || die "cache: $field select; ".$self->{dbh}->errstr();
90 if (! $sth_cache{$field."select"}->fetchrow_hashref) {
91 $index_data = substr($index_data,0,255);
92 $sth_cache{$field."insert"}->execute($index_data,$ident,1) || die "cache: $field insert; ".$self->{dbh}->errstr();
93 #print stderr "in index: $index_data\n";
95 $sth_cache{$field."update"}->execute($index_data,$ident) || die "cache: $field update; ".$self->{dbh}->errstr();
104 my $sql = "select count(*) from $field";
106 my $sth = $self->{dbh}->prepare($sql) || die $self->{dbh}->errstr();
107 $sth->execute() || die "sql: $sql; ".$self->{dbh}->errstr();
109 my ($total) = $sth->fetchrow_array();
119 my $what = shift || 'item'; # 'item,ident'
122 my $from_ord = shift || 0;
123 my $rows = shift || 10;
127 my $sql = "select $what,ord from $field";
130 my $sql2 = " select ord from $field where upper($what) like upper(?)||'%'";
131 my $sth = $self->{dbh}->prepare($sql2) || die "sql2: $sql2; ".$self->{dbh}->errstr();
133 $sth->execute($where) || die "sql2: $sql2; ".$self->{dbh}->errstr();
134 if (my $row = $sth->fetchrow_hashref) {
135 $from_ord += $row->{ord} - 1;
138 $sql .= " order by ord limit $rows offset $from_ord";
140 my $sth = $self->{dbh}->prepare($sql) || die "prepare: $sql; ".$self->{dbh}->errstr();
141 $sth->execute() || die "execute: $sql; ".$self->{dbh}->errstr();
143 while (my $row = $sth->fetchrow_hashref) {
144 $row->{item} = HTML::Entities::encode($row->{item},'<>&"');
154 # re-create ord column (sorted order) in table
159 $self->{dbh}->begin_work || die $self->{dbh}->errstr();
161 my $sql = "select oid from $table order by upper(item)";
162 my $sth = $self->{dbh}->prepare($sql) || die "sql: $sql; ".$self->{dbh}->errstr();
163 $sql = "update $table set ord=? where oid=?";
164 my $sth_update = $self->{dbh}->prepare($sql) || die "sql: $sql; ".$self->{dbh}->errstr();
165 $sth->execute() || die "sql: $sql; ".$self->{dbh}->errstr();
167 while (my $row = $sth->fetchrow_hashref) {
168 $sth_update->execute($ord++,$row->{oid});
171 $self->{dbh}->commit || die $self->{dbh}->errstr();
178 $self->{dbh}->commit || die $self->{dbh}->errstr();
180 foreach my $table (keys %Table) {
182 print STDERR "creating ord for $table...\n";
186 $self->{dbh}->disconnect;
193 print STDERR "index_DBI fatal error: \$index->close() not called... $Count references left!\n" if ($Count > 0);
195 # print STDERR "usage\ttable\n";
196 # foreach (keys %Table) {
197 # print STDERR $Table{$_},"\t$_\n";