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