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# |
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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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|
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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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|
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use DBI; |
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|
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my %Table; # index tables which where visited in this run |
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my %sth_cache; # cache prepared statements |
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|
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# cache var |
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my $c_table; |
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my $c_count; |
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|
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# bench time |
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my $bench_time = time(); |
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|
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sub bench { |
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my $self = shift; |
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my $msg = shift; |
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|
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print STDERR "last operation took ",time()-$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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|
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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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|
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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 $passwd = shift || die "need dbi_passwd= in [global] section of configuration file"; |
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|
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$self->{dbh} = DBI->connect("DBI:$dbd:$dsn",$user,$passwd) || die $DBI::errstr; |
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$Count++; |
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|
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$self->bench("connected to $dbd as $user"); |
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|
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return $self; |
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} |
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|
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sub delete_and_create { |
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my $self = shift; |
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|
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my $field = shift; |
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|
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#print "#### delete_and_create($field)\n"; |
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|
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my $sql = "select count(*) from $field"; |
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my $sth = $self->{dbh}->prepare($sql) || die $self->{dbh}->errstr(); |
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# FIX: this is not a good way to check if table exists! |
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if ($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 $field ( |
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item varchar(255), |
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count int, |
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ord int, |
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primary key (item) |
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)"; |
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|
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$sth = $self->{dbh}->do($sql) || warn "SQL: $sql ".$self->{dbh}->errstr(); |
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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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|
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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 $ident = shift || ''; # e.g. library id |
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|
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if (! $index_data) { |
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print STDERR "\$index->insert() -- no value to insert\n"; |
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return; |
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} |
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|
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$Table{$field}++; |
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|
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#$sth_cache{$field."select"}->execute($index_data) || die "cache: $field select; ".$self->{dbh}->errstr(); |
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|
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# XXX for some strange reason, it seems that some entries in my |
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# database produce strings which start with null byte. I suspect |
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# this to be bug in OpenIsis 0.9.0. |
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# This should fix it.. |
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$index_data =~ s/^[^\w]+//; |
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$index_data = substr($index_data,0,255); |
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|
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my $uc = uc($index_data); |
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if (! $c_table->{$field}->{$uc}) { |
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#print stderr "in index: $index_data\n"; |
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$c_table->{$field}->{$uc} = $index_data; |
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$c_count->{$field}->{$uc} = 1; |
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} else { |
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$c_count->{$field}->{$uc}++; |
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} |
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} |
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|
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sub count { |
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my $self = shift; |
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|
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my $field = shift; |
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my $where = shift; |
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|
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my $sql = "select count(*) from $field where upper(item) like upper(?)||'%'"; |
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|
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my $sth = $self->{dbh}->prepare($sql) || die $self->{dbh}->errstr(); |
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$sth->execute($where) || die "sql: $sql; ".$self->{dbh}->errstr(); |
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|
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my ($total) = $sth->fetchrow_array(); |
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|
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# no results, count all |
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if (! $total) { |
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my $sql = "select count(*) from $field"; |
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|
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my $sth = $self->{dbh}->prepare($sql) || die $self->{dbh}->errstr(); |
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$sth->execute() || die "sql: $sql; ".$self->{dbh}->errstr(); |
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$total = $sth->fetchrow_array(); |
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|
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} |
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|
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return $total || 1; |
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} |
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|
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|
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sub fetch { |
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my $self = shift; |
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|
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my $field = shift; |
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my $where = shift; |
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|
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my $from_ord = shift || 0; |
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my $rows = shift || 10; |
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|
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my @sql_args; |
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|
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my $sql = "select item,ord from $field"; |
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|
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if ($where) { |
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my $sql2 = "select ord from $field where upper(item) like upper(?)||'%'"; |
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my $sth = $self->{dbh}->prepare($sql2) || die "sql2: $sql2; ".$self->{dbh}->errstr(); |
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|
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$sth->execute($where) || die "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 = "select ord from $field where upper(item) like '%'||upper(?)||'%'"; |
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$sth = $self->{dbh}->prepare($sql2) || die "sql2: $sql2; ".$self->{dbh}->errstr(); |
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$sth->execute($where) || die "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 .= " order by ord limit $rows offset $from_ord"; |
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|
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my $sth = $self->{dbh}->prepare($sql) || die "prepare: $sql; ".$self->{dbh}->errstr(); |
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$sth->execute() || die "execute: $sql; ".$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($row->{item},'<>&"'); |
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push @arr,$row; |
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} |
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return @arr; |
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} |
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|
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sub close { |
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my $self = shift; |
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|
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return if (! $self->{dbh}); |
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|
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foreach my $table (keys %Table) { |
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$self->bench("Crating table $table"); |
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$self->delete_and_create($table); |
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|
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$self->{dbh}->begin_work || die $self->{dbh}->errstr(); |
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|
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$self->bench("Sorting ".$Table{$table}." items in $table"); |
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my @keys = sort keys %{$c_table->{$table}}; |
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|
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$self->bench("Dumping data into $table"); |
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my $sql = "insert into $table (ord,item,count) values (?,?,?)"; |
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my $sth = $self->{dbh}->prepare($sql) || die "sql: $sql; ".$self->{dbh}->errstr(); |
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|
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my $ord = 0; |
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foreach my $key (@keys) { |
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$sth->execute(++$ord, |
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$c_table->{$table}->{$key}, |
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$c_count->{$table}->{$key} |
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); |
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} |
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|
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$self->{dbh}->commit || die $self->{dbh}->errstr(); |
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} |
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$self->bench("disconnecting from database"); |
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|
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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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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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|
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1; |