#
# this file implements index functions using DBI
# and huge amounts of memory for cache speedup
#
# this version doesn't support ident (which sould be location in
# library). But, that functionality is not used anyway...
#
package index_DBI;
use strict qw(vars);
use vars qw($Count);
use HTML::Entities;
use URI::Escape;
use Carp;
use DBI;
use locale;
# bench time
my $bench_time = time();
my $debug = 1;
sub bench {
my $self = shift;
my $msg = shift;
print STDERR "last operation took ",time()-$bench_time," seconds...\n";
$bench_time=time();
print STDERR "$msg\n";
}
sub new {
my $class = shift;
my $self = {};
bless($self, $class);
my $dbd = shift || die "need dbi_dbd= in [global] section of configuration file";
my $dsn = shift || die "need dbi_dsn= in [global] section of configuration file";
my $user = shift || die "need dbi_user= in [global] section of configuration file";
my $passwd = shift || die "need dbi_passwd= in [global] section of configuration file";
$self->{dbd} = $dbd;
$self->{dbh} = DBI->connect("DBI:$dbd:$dsn",$user,$passwd) || die $DBI::errstr;
$Count++;
$self->bench("connected to $dbd as $user");
# force SQLite to support binary 0 in data (which shouldn't
# happend, but it did to me)
eval {
no warnings 'all';
$self->{dbh}->{sqlite_handle_binary_nulls} = 1;
};
return $self;
}
sub delete_and_create {
my $self = shift;
my $table = shift || croak "need table name!";
my $sql = shift || croak "need sql to create table!";
print STDERR "## delete_and_create($table)\n" if ($debug);
my $sql_delete = "delete from $table";
my $sth = $self->{dbh}->prepare($sql_delete);
if ($sth && $sth->execute()) {
print STDERR "## deleted rows from table $table\n" if ($debug);
} else {
# can't delete from table, assume it doesn't exists!
$self->{dbh}->rollback;
$self->{dbh}->do($sql) || confess "SQL: $sql ".$self->{dbh}->errstr();
print STDERR "## creating table $table\n" if ($debug);
$self->{dbh}->begin_work;
}
}
sub insert {
my $self = shift;
my $field = shift;
my $index_data = shift || print STDERR "\$index->insert($field,NULL,...)";
my $display = shift || $index_data;
my $filter = shift;
if (! $index_data) {
print STDERR "\$index->insert() -- no value to insert\n";
return;
}
$index_data =~ s#&(\w)(acute|cedil|circ|grave|ring|slash|tilde|uml);#$1#gi;
# strip spaces
$index_data =~ s#^\s+##;
$index_data =~ s#\s+$##;
$index_data =~ s#\s\s+# #g;
my $uc = uc($index_data);
if (! $self->{c}->{$uc}->{$field}) {
#print stderr "in index: $index_data\n";
$self->{c}->{$uc}->{$field}->{item} = lc($index_data);
$self->{c}->{$uc}->{$field}->{display} = $display;
}
$self->{c}->{$uc}->{$field}->{count}++;
$self->{c}->{$uc}->{$field}->{filter}->{$filter}++ if ($filter);
}
sub count {
my $self = shift;
my $field = shift;
my $where = shift;
my $filter = shift;
my $tables_sql = 'data';
my $where_sql = '';
my @sql_args = ( $field, lc($where) );
if ($filter) {
$tables_sql .= ",filters";
$where_sql .= "
and data.ord = filters.ord
and filter = ?
";
push @sql_args, $filter;
}
my $sql = qq{
select count(*)
from $tables_sql
where name = ? and item like ?||'%'
$where_sql
};
my $sth = $self->{dbh}->prepare($sql) || confess $self->{dbh}->errstr();
$sth->execute(@sql_args) || confess "sql: $sql; ".$self->{dbh}->errstr();
my ($total) = $sth->fetchrow_array();
# no results, count all
if (! $total) {
my $sql = qq{
select count(*)
from $tables_sql
where data.name = ?
$where_sql
};
@sql_args = ( $field );
push @sql_args, $filter if ($filter);
my $sth = $self->{dbh}->prepare($sql) || confess $self->{dbh}->errstr();
$sth->execute(@sql_args) || confess "sql: $sql; ".$self->{dbh}->errstr();
$total = $sth->fetchrow_array();
}
return $total || '0';
}
sub fetch {
my $self = shift;
my $field = shift;
my $where = shift;
my $offset = shift || 0;
my $rows = shift || 10;
my $filter = shift;
my $from_ord = 0;
my $tables_sql = 'data';
my $where_sql = '';
my @sql_args = ( $field, lc($where) );
if ($filter) {
$tables_sql .= ",filters";
$where_sql .= "
and data.ord = filters.ord
and filter = ?
";
push @sql_args, $filter;
}
if ($where) {
my $sql2 = qq{
select data.ord as ord
from $tables_sql
where name = ? and item like ?||'%'
$where_sql
order by data.ord
};
my $sth = $self->{dbh}->prepare($sql2) || confess "sql2: $sql2; ".$self->{dbh}->errstr();
$sth->execute(@sql_args) || confess "sql2: $sql2; ".$self->{dbh}->errstr();
if (my $row = $sth->fetchrow_hashref) {
$from_ord = $row->{ord} - 1;
} else {
# if no match is found when searching from beginning
# of word in index, try substring match anywhere
$sql2 = qq{
select data.ord as ord
from $tables_sql
where name = ? and item like '%'||?||'%'
$where_sql
order by data.ord
};
$sth = $self->{dbh}->prepare($sql2) || confess "sql2: $sql2; ".$self->{dbh}->errstr();
$sth->execute(@sql_args) || confess "sql2: $sql2; ".$self->{dbh}->errstr();
if (my $row = $sth->fetchrow_hashref) {
$from_ord = $row->{ord} - 1;
}
}
}
@sql_args = ( $field, $from_ord );
push @sql_args, $filter if ($filter);
my $sql = qq{
select item,display,data.count as count
from $tables_sql
where name = ?
and data.ord > ?
$where_sql
order by data.ord
};
# fix SQLite problem which doesn't allow placeholders in limit and offset
# http://thread.gmane.org/gmane.comp.db.sqlite.general/9707
$sql .= "limit $rows offset $offset";
my $sth = $self->{dbh}->prepare($sql) || confess "prepare: $sql; ".$self->{dbh}->errstr();
$sth->execute(@sql_args) || confess "execute: $sql; ".join("|",@sql_args)." ".$self->{dbh}->errstr();
my @arr;
while (my $row = $sth->fetchrow_hashref) {
$row->{item} = HTML::Entities::encode($row->{item},' <>&"');
$row->{display} = HTML::Entities::encode($row->{display},'<>&"');
$row->{item} =~ s#&(\w)(acute|cedil|circ|grave|ring|slash|tilde|uml);#$1#gi;
$row->{display} =~ s#&(\w)(acute|cedil|circ|grave|ring|slash|tilde|uml);#&$1$2;#gi;
push @arr,$row;
}
return @arr;
}
sub close {
my $self = shift;
return if (! $self->{dbh});
$self->{dbh}->begin_work || confess $self->{dbh}->errstr();
$self->delete_and_create('data', qq{
create table data (
name varchar(255),
ord int,
item text,
display text,
count int,
primary key (name,ord)
);
});
$self->delete_and_create('filters', qq{
create table filters (
filter varchar(255),
ord int,
count int,
primary key (filter,ord)
);
});
$self->bench("getting all entries");
my @items = keys %{$self->{c}};
$self->bench("got ".($#items+1)." items, now sorting");
@items = sort @items;
my $sql = "insert into data (name,ord,item,display,count) values (?,?,?,?,?)";
my $sth_index = $self->{dbh}->prepare($sql) || confess "$sql: ".$self->{dbh}->errstr();
$sql = "insert into filters (filter, ord, count) values (?,?,?)";
my $sth_filter = $self->{dbh}->prepare($sql) || confess "$sql: ".$self->{dbh}->errstr();
my $ord = 0;
foreach my $key (@items) {
foreach my $field (keys %{$self->{c}->{$key}}) {
# store items
$sth_index->execute(
$field,
++$ord,
$self->{c}->{$key}->{$field}->{item},
$self->{c}->{$key}->{$field}->{display},
$self->{c}->{$key}->{$field}->{count},
);
# store filters
next unless ($self->{c}->{$key}->{$field}->{filter});
foreach my $filter (keys %{$self->{c}->{$key}->{$field}->{filter}}) {
$sth_filter->execute( $filter, $ord, $self->{c}->{$key}->{$field}->{filter}->{$filter} );
}
}
}
$self->{dbh}->commit || confess $self->{dbh}->errstr();
$self->bench("vacuuming");
if ($self->{dbd} =~ m/(Pg|SQLite)/) {
$self->{dbh}->do(qq{vacuum}) || carp "vacumming failed. It shouldn't if you are using PostgreSQL or SQLite: ".$self->{dbh}->errstr();
}
$self->bench("disconnecting from database");
$self->{dbh}->disconnect;
undef $self->{dbh};
}
END {
$Count--;
print STDERR "index_DBI fatal error: \$index->close() not called... $Count references left!\n" if ($Count > 0);
# FIX: debug output
# print STDERR "usage\ttable\n";
# foreach (keys %Table) {
# print STDERR $Table{$_},"\t$_\n";
# }
}
1;
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