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dpavlin |
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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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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 DBI; |
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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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# cache var |
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my $c_table; |
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my $c_count; |
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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->{dbh} = DBI->connect("DBI:$dbd:$dsn",$user,$passwd) || die $DBI::errstr; |
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# begin transaction |
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$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 $field = shift; |
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#print "#### delete_and_create($field)\n"; |
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$self->{dbh}->commit; |
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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 $field"; |
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$self->{dbh}->begin_work; |
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my $sth = $self->{dbh}->do($sql) || die "SQL: $sql ".$self->{dbh}->errstr(); |
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$self->{dbh}->commit; |
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} |
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$sql = "create table $field ( |
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item varchar(255), |
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ident varchar(255), |
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count int, |
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ord int, |
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primary key (item,ident) |
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)"; |
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$self->{dbh}->begin_work; |
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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 $index_data = shift || print STDERR "\$index->insert($field,NULL,...)"; |
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my $ident = shift || ''; # e.g. library id |
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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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my $sql = "select item from $field where upper(item)=upper(?)"; |
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$sth_cache{$field."select"} = $self->{dbh}->prepare($sql) || die $self->{dbh}->errstr(); |
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$sql = "insert into $field (item,ident,count) values (?,?,?)"; |
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$sth_cache{$field."insert"} = $self->{dbh}->prepare($sql) || die $self->{dbh}->errstr(); |
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$sql = "update $field set count = count + 1 where item = ? and ident = ?"; |
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$sth_cache{$field."update"} = $self->{dbh}->prepare($sql) || die $self->{dbh}->errstr(); |
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} |
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$Table{$field}++; |
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#$sth_cache{$field."select"}->execute($index_data) || die "cache: $field select; ".$self->{dbh}->errstr(); |
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$index_data = substr($index_data,0,255); |
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my $uc = uc($index_data); |
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if (! $c_table->{$field}->{$ident}->{$uc}) { |
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dpavlin |
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$sth_cache{$field."insert"}->execute($index_data,$ident,0) || warn "cache: $field insert ($index_data,$ident); ".$self->{dbh}->errstr(); |
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dpavlin |
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#print stderr "in index: $index_data\n"; |
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$c_table->{$field}->{$ident}->{$uc} = $index_data; |
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$c_count->{$field}->{$ident}->{$uc} = 1; |
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} else { |
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$c_count->{$field}->{$ident}->{$uc}++; |
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} |
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} |
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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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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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my ($total) = $sth->fetchrow_array(); |
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return $total; |
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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 $from_ord = shift || 0; |
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my $rows = shift || 10; |
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my @sql_args; |
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my $sql = "select $what,ord from $field"; |
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if ($where) { |
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my $sql2 = " select ord from $field where upper($what) like upper(?)||'%'"; |
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my $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 += $row->{ord} - 1; |
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} |
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} |
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$sql .= " order by ord limit $rows offset $from_ord"; |
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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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sub close { |
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my $self = shift; |
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# re-create ord column (sorted order) in table |
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sub create_ord { |
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my $table = shift; |
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$self->{dbh}->begin_work || die $self->{dbh}->errstr(); |
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my $sql = "select oid from $table order by upper(item)"; |
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my $sth = $self->{dbh}->prepare($sql) || die "sql: $sql; ".$self->{dbh}->errstr(); |
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$sql = "update $table set ord=? where oid=?"; |
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my $sth_update = $self->{dbh}->prepare($sql) || die "sql: $sql; ".$self->{dbh}->errstr(); |
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$sth->execute() || die "sql: $sql; ".$self->{dbh}->errstr(); |
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my $ord = 1; |
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while (my $row = $sth->fetchrow_hashref) { |
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$sth_update->execute($ord++,$row->{oid}); |
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} |
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$self->{dbh}->commit || die $self->{dbh}->errstr(); |
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} |
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#--- end of sub |
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if ($self->{dbh}) { |
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# commit |
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$self->{dbh}->commit || die $self->{dbh}->errstr(); |
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foreach my $table (keys %Table) { |
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# FIX |
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print STDERR "creating ord for $table...\n"; |
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create_ord($table); |
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undef $sth_cache{$table."select"}; |
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undef $sth_cache{$table."insert"}; |
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undef $sth_cache{$table."update"}; |
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# XXX |
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# $sth_cache{$field."update"}->execute($index_data,$ident) || die "cache: $field update; ".$self->{dbh}->errstr(); |
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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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1; |