2 # this file implements index functions using DBI
3 # and huge amounts of memory for cache speedup
5 # this version doesn't support ident (which sould be location in
6 # library). But, that functionality is not used anyway...
18 my %Table; # index tables which where visited in this run
19 my %sth_cache; # cache prepared statements
26 my $bench_time = time();
32 print STDERR "last operation took ",time()-$bench_time," seconds...\n";
34 print STDERR "$msg\n";
42 my $dbd = shift || die "need dbi_dbd= in [global] section of configuration file";
43 my $dsn = shift || die "need dbi_dsn= in [global] section of configuration file";
44 my $user = shift || die "need dbi_user= in [global] section of configuration file";
45 my $passwd = shift || die "need dbi_passwd= in [global] section of configuration file";
49 $self->{dbh} = DBI->connect("DBI:$dbd:$dsn",$user,$passwd) || die $DBI::errstr;
52 $self->bench("connected to $dbd as $user");
54 # force SQLite to support binary 0 in data (which shouldn't
55 # happend, but it did to me)
58 $self->{dbh}->{sqlite_handle_binary_nulls} = 1;
64 sub delete_and_create {
69 #print "#### delete_and_create($field)\n";
71 my $sql = "select count(*) from $field";
72 my $sth = $self->{dbh}->prepare($sql) || die $self->{dbh}->errstr();
73 # FIX: this is not a good way to check if table exists!
74 if ($sth->execute() && $sth->fetchrow_hashref) {
75 my $sql = "drop table $field";
76 my $sth = $self->{dbh}->do($sql) || warn "SQL: $sql - ".$sth->errstr();
78 $sql = "create table $field (
86 $sth = $self->{dbh}->do($sql) || warn "SQL: $sql ".$self->{dbh}->errstr();
93 my $index_data = shift || print STDERR "\$index->insert($field,NULL,...)";
94 my $display = shift || $index_data;
97 print STDERR "\$index->insert() -- no value to insert\n";
103 #$sth_cache{$field."select"}->execute($index_data) || die "cache: $field select; ".$self->{dbh}->errstr();
105 # XXX for some strange reason, it seems that some entries in my
106 # database produce strings which start with null byte. I suspect
107 # this to be bug in OpenIsis 0.9.0.
108 # This should fix it..
109 $index_data =~ s/^[^\w]+//;
110 $index_data = substr($index_data,0,255);
112 my $uc = uc($index_data);
113 if (! $c_table->{$field}->{$uc}) {
114 #print stderr "in index: $index_data\n";
115 $c_table->{$field}->{$uc} = $index_data;
116 $c_table->{$field}->{$uc}->{display} = $display;
117 $c_count->{$field}->{$uc} = 1;
119 $c_count->{$field}->{$uc}++;
129 my $sql = "select count(*) from $field where upper(item) like upper(?)||'%'";
131 my $sth = $self->{dbh}->prepare($sql) || die $self->{dbh}->errstr();
132 $sth->execute($where) || die "sql: $sql; ".$self->{dbh}->errstr();
134 my ($total) = $sth->fetchrow_array();
136 # no results, count all
138 my $sql = "select count(*) from $field";
140 my $sth = $self->{dbh}->prepare($sql) || die $self->{dbh}->errstr();
141 $sth->execute() || die "sql: $sql; ".$self->{dbh}->errstr();
142 $total = $sth->fetchrow_array();
156 my $from_ord = shift || 0;
157 my $rows = shift || 10;
161 my $sql = "select item,display,ord from $field";
164 my $sql2 = "select ord from $field where upper(item) like upper(?)||'%'";
165 my $sth = $self->{dbh}->prepare($sql2) || die "sql2: $sql2; ".$self->{dbh}->errstr();
167 $sth->execute($where) || die "sql2: $sql2; ".$self->{dbh}->errstr();
168 if (my $row = $sth->fetchrow_hashref) {
169 $from_ord += $row->{ord} - 1;
171 # if no match is found when searching from beginning
172 # of word in index, try substring match anywhere
173 $sql2 = "select ord from $field where upper(item) like '% '||upper(?)||'%'";
174 $sth = $self->{dbh}->prepare($sql2) || die "sql2: $sql2; ".$self->{dbh}->errstr();
175 $sth->execute($where) || die "sql2: $sql2; ".$self->{dbh}->errstr();
176 if (my $row = $sth->fetchrow_hashref) {
177 $from_ord += $row->{ord} - 1;
181 $sql .= " order by ord limit $rows offset $from_ord";
183 my $sth = $self->{dbh}->prepare($sql) || die "prepare: $sql; ".$self->{dbh}->errstr();
184 $sth->execute() || die "execute: $sql; ".$self->{dbh}->errstr();
186 while (my $row = $sth->fetchrow_hashref) {
187 $row->{item} = HTML::Entities::encode($row->{item},' <>&"');
188 $row->{display} = HTML::Entities::encode($row->{display},'<>&"');
197 return if (! $self->{dbh});
199 foreach my $table (keys %Table) {
200 $self->bench("Crating table $table");
201 $self->delete_and_create($table);
203 $self->{dbh}->begin_work || die $self->{dbh}->errstr();
205 $self->bench("Sorting ".$Table{$table}." (with duplicates) items in $table");
206 my @keys = sort keys %{$c_table->{$table}};
208 $self->bench("Dumping ".($#keys+1)." items into $table");
209 my $sql = "insert into $table (ord,item,display,count) values (?,?,?,?)";
210 my $sth = $self->{dbh}->prepare($sql) || die "sql: $sql; ".$self->{dbh}->errstr();
213 foreach my $key (@keys) {
214 $sth->execute(++$ord,
215 $c_table->{$table}->{$key},
216 $c_table->{$table}->{$key}->{display},
217 $c_count->{$table}->{$key}
221 $self->{dbh}->commit || die $self->{dbh}->errstr();
224 if ($self->{dbd} =~ m/(Pg|SQLite)/) {
225 $self->{dbh}->do(qq{vacuum}) || warn "vacumming failed. It shouldn't if you are using PostgreSQL or SQLite: ".$self->{dbh}->errstr();
228 $self->bench("disconnecting from database");
230 $self->{dbh}->disconnect;
236 print STDERR "index_DBI fatal error: \$index->close() not called... $Count references left!\n" if ($Count > 0);
238 # print STDERR "usage\ttable\n";
239 # foreach (keys %Table) {
240 # print STDERR $Table{$_},"\t$_\n";