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dpavlin |
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# this file implements index functions using DBI |
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# |
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package index_DBI; |
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use strict qw(vars); |
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use vars qw($Count); |
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use DBI; |
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my %Table; # index tables which where visited in this run |
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sub new { |
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my $class = shift; |
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my $self = {}; |
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bless($self, $class); |
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# FIX: config params |
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dpavlin |
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$self->{dbh} = DBI->connect("DBI:Pg:dbname=webpac","dpavlin","") || die $DBI::errstr; |
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dpavlin |
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# begin transaction |
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$self->{dbh}->begin_work || die $self->{dbh}->errstr(); |
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$Count++; |
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return $self; |
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} |
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sub delete_and_create { |
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my $self = shift; |
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my $field = shift; |
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$self->{dbh}->commit; |
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$self->{dbh}->begin_work; |
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my $sql = "select count(*) from $field"; |
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my $sth = $self->{dbh}->prepare($sql) || die $self->{dbh}->errstr(); |
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# FIX: this is not a good way to check if table exists! |
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if (1 || $sth->execute() && $sth->fetchrow_hashref) { |
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my $sql = "drop table $field"; |
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# my $sth = $self->{dbh}->do($sql) || die "SQL: $sql ".$self->{dbh}->errstr(); |
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} |
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$sql = "create table $field ( |
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item varchar(255), |
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ident varchar(255), |
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count int, |
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primary key (item,ident) |
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)"; |
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# $sth = $self->{dbh}->do($sql) || die "SQL: $sql ".$self->{dbh}->errstr(); |
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$sth = $self->{dbh}->do($sql) || warn "SQL: $sql ".$self->{dbh}->errstr(); |
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$self->{dbh}->commit; |
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$self->{dbh}->begin_work; |
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} |
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sub insert { |
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my $self = shift; |
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my $field = shift; |
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my $index_data = shift; |
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dpavlin |
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my $ident = shift; # e.g. library id |
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dpavlin |
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if (! $index_data) { |
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print STDERR "\$index->insert() -- no value to insert\n"; |
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return; |
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} |
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if (! $Table{$field}) { |
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$self->delete_and_create($field); |
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} |
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$Table{$field}++; |
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my $sql = "select item from $field where upper(item)=upper(?)"; |
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my $sth = $self->{dbh}->prepare($sql) || die $self->{dbh}->errstr(); |
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dpavlin |
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$sth->execute($index_data) || die "sql: $sql; ".$self->{dbh}->errstr(); |
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dpavlin |
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if (! $sth->fetchrow_hashref) { |
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my $sql = "insert into $field (item,ident,count) values (?,?,?)"; |
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my $sth = $self->{dbh}->prepare($sql) || die $self->{dbh}->errstr(); |
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dpavlin |
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$sth->execute($index_data,$ident,1) || die "sql: $sql; ".$self->{dbh}->errstr(); |
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#print stderr "in index: $index_data\n"; |
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dpavlin |
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} else { |
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my $sql = "update $field set count = count + 1 where item = ? and ident = ?"; |
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my $sth = $self->{dbh}->prepare($sql) || die $self->{dbh}->errstr(); |
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dpavlin |
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$sth->execute($index_data,$ident) || die "sql: $sql; ".$self->{dbh}->errstr(); |
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dpavlin |
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} |
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} |
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dpavlin |
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sub check { |
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my $self = shift; |
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my $field = shift; |
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my $sql = "select count(*) from $field"; |
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return $self->{dbh}->do($sql); |
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} |
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sub fetch { |
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my $self = shift; |
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my $field = shift; |
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my $what = shift || 'item'; # 'item,ident' |
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my $where = shift; |
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my @sql_args; |
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my $sql = "select $what from $field"; |
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if ($where) { |
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$sql .= " where upper(item) like upper(?)||'%'"; |
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push @sql_args,$where; |
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} |
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$sql .= " order by item"; |
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my $sth = $self->{dbh}->prepare($sql) || die "sql: $sql; ".$self->{dbh}->errstr(); |
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$sth->execute(@sql_args) || die "sql: $sql; ".$self->{dbh}->errstr(); |
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my @arr; |
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while (my $row = $sth->fetchrow_hashref) { |
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push @arr,$row; |
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} |
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return @arr; |
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} |
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dpavlin |
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sub close { |
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my $self = shift; |
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if ($self->{dbh}) { |
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$self->{dbh}->commit || die $self->{dbh}->errstr(); |
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$self->{dbh}->disconnect; |
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undef $self->{dbh}; |
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} |
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} |
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END { |
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$Count--; |
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dpavlin |
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print STDERR "index_DBI fatal error: \$index->close() not called... $Count references left!\n" if ($Count > 0); |
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dpavlin |
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# FIX: debug output |
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dpavlin |
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# print STDERR "usage\ttable\n"; |
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# foreach (keys %Table) { |
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# print STDERR $Table{$_},"\t$_\n"; |
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# } |
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dpavlin |
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} |
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1; |