2 # this file implements index functions using DBI
3 # and huge amounts of memory for cache speedup
13 my %Table; # index tables which where visited in this run
14 my %sth_cache; # cache prepared statements
28 my $dbd = shift || die "need dbi_dbd= in [global] section of configuration file";
29 my $dsn = shift || die "need dbi_dsn= in [global] section of configuration file";
30 my $user = shift || die "need dbi_user= in [global] section of configuration file";
31 my $passwd = shift || die "need dbi_passwd= in [global] section of configuration file";
33 $self->{dbh} = DBI->connect("DBI:$dbd:$dsn",$user,$passwd) || die $DBI::errstr;
35 $self->{dbh}->begin_work || die $self->{dbh}->errstr();
42 sub delete_and_create {
47 #print "#### delete_and_create($field)\n";
51 my $sql = "select count(*) from $field";
52 my $sth = $self->{dbh}->prepare($sql) || die $self->{dbh}->errstr();
53 # FIX: this is not a good way to check if table exists!
54 if ($sth->execute() && $sth->fetchrow_hashref) {
55 my $sql = "drop table $field";
56 $self->{dbh}->begin_work;
57 my $sth = $self->{dbh}->do($sql) || die "SQL: $sql ".$self->{dbh}->errstr();
60 $sql = "create table $field (
65 primary key (item,ident)
68 $self->{dbh}->begin_work;
69 $sth = $self->{dbh}->do($sql); # || warn "SQL: $sql ".$self->{dbh}->errstr();
72 $self->{dbh}->begin_work;
79 my $index_data = shift || print STDERR "\$index->insert($field,NULL,...)";
80 my $ident = shift || ''; # e.g. library id
83 print STDERR "\$index->insert() -- no value to insert\n";
87 if (! $Table{$field}) {
88 $self->delete_and_create($field);
90 my $sql = "select item from $field where upper(item)=upper(?)";
91 $sth_cache{$field."select"} = $self->{dbh}->prepare($sql) || die $self->{dbh}->errstr();
93 $sql = "insert into $field (item,ident,count) values (?,?,?)";
94 $sth_cache{$field."insert"} = $self->{dbh}->prepare($sql) || die $self->{dbh}->errstr();
96 $sql = "update $field set count = count + 1 where item = ? and ident = ?";
97 $sth_cache{$field."update"} = $self->{dbh}->prepare($sql) || die $self->{dbh}->errstr();
101 #$sth_cache{$field."select"}->execute($index_data) || die "cache: $field select; ".$self->{dbh}->errstr();
103 # XXX for some strange reason, it seems that some entries in my
104 # database produce strings which start with null byte. I suspect
105 # this to be bug in OpenIsis 0.9.0.
106 # This should fix it..
107 $index_data =~ s/^[^\w]+//;
108 $index_data = substr($index_data,0,255);
110 my $uc = uc($index_data);
111 if (! $c_table->{$field}->{$ident}->{$uc}) {
112 $sth_cache{$field."insert"}->execute($index_data,$ident,0) || warn "cache: $field insert ($index_data,$ident); ".$self->{dbh}->errstr();
113 #print stderr "in index: $index_data\n";
114 $c_table->{$field}->{$ident}->{$uc} = $index_data;
115 $c_count->{$field}->{$ident}->{$uc} = 1;
117 $c_count->{$field}->{$ident}->{$uc}++;
126 my $sql = "select count(*) from $field";
128 my $sth = $self->{dbh}->prepare($sql) || die $self->{dbh}->errstr();
129 $sth->execute() || die "sql: $sql; ".$self->{dbh}->errstr();
131 my ($total) = $sth->fetchrow_array();
141 my $what = shift || 'item'; # 'item,ident'
144 my $from_ord = shift || 0;
145 my $rows = shift || 10;
149 my $sql = "select $what,ord from $field";
152 my $sql2 = " select ord from $field where upper($what) like upper(?)||'%'";
153 my $sth = $self->{dbh}->prepare($sql2) || die "sql2: $sql2; ".$self->{dbh}->errstr();
155 $sth->execute($where) || die "sql2: $sql2; ".$self->{dbh}->errstr();
156 if (my $row = $sth->fetchrow_hashref) {
157 $from_ord += $row->{ord} - 1;
160 $sql .= " order by ord limit $rows offset $from_ord";
162 my $sth = $self->{dbh}->prepare($sql) || die "prepare: $sql; ".$self->{dbh}->errstr();
163 $sth->execute() || die "execute: $sql; ".$self->{dbh}->errstr();
165 while (my $row = $sth->fetchrow_hashref) {
166 $row->{item} = HTML::Entities::encode($row->{item},'<>&"');
176 # re-create ord column (sorted order) in table
181 $self->{dbh}->begin_work || die $self->{dbh}->errstr();
183 my $sql = "select oid from $table order by upper(item)";
184 my $sth = $self->{dbh}->prepare($sql) || die "sql: $sql; ".$self->{dbh}->errstr();
185 $sql = "update $table set ord=? where oid=?";
186 my $sth_update = $self->{dbh}->prepare($sql) || die "sql: $sql; ".$self->{dbh}->errstr();
187 $sth->execute() || die "sql: $sql; ".$self->{dbh}->errstr();
189 while (my $row = $sth->fetchrow_hashref) {
190 $sth_update->execute($ord++,$row->{oid});
193 $self->{dbh}->commit || die $self->{dbh}->errstr();
200 $self->{dbh}->commit || die $self->{dbh}->errstr();
202 foreach my $table (keys %Table) {
204 print STDERR "last operation took ",time()-$t," seconds...\n";
206 print STDERR "creating ord for $table...\n";
208 undef $sth_cache{$table."select"};
209 undef $sth_cache{$table."insert"};
210 undef $sth_cache{$table."update"};
212 # $sth_cache{$field."update"}->execute($index_data,$ident) || die "cache: $field update; ".$self->{dbh}->errstr();
215 $self->{dbh}->disconnect;
222 print STDERR "index_DBI fatal error: \$index->close() not called... $Count references left!\n" if ($Count > 0);
224 # print STDERR "usage\ttable\n";
225 # foreach (keys %Table) {
226 # print STDERR $Table{$_},"\t$_\n";