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350 lines
8.3 KiB
Perl
350 lines
8.3 KiB
Perl
#!/usr/bin/perl
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# $Id: mysql.pm,v 1.5 2000/06/25 19:50:43 scip Exp scip $
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# Perl module for note
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# mysql database backend. see docu: perldoc NOTEDB::binary
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#
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use DBI;
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use strict;
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use Data::Dumper;
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package NOTEDB;
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BEGIN {
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# make sure, it works, although encryption
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# not supported on this system!
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eval { require Crypt::CBC; };
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if($@) {
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$NOTEDB::crypt_supported = 0;
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}
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else {
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$NOTEDB::crypt_supported = 1;
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}
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}
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# Globals:
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my ($DB, $table, $fnum, $fnote, $fdate, $version, $cipher);
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$table = "note";
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$fnum = "number";
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$fnote = "note";
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$fdate = "date";
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$version = "(NOTEDB::mysql, 1.4)";
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# prepare some std statements... #####################################################################
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my $sql_getsingle = "SELECT $fnote,$fdate FROM $table WHERE $fnum = ?";
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my $sql_all = "SELECT $fnum,$fnote,$fdate FROM $table";
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my $sql_nextnum = "SELECT max($fnum) FROM $table";
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my $sql_incrnum = "SELECT $fnum FROM $table ORDER BY $fnum";
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my $sql_search = "SELECT DISTINCT $fnum,$fnote,$fdate FROM $table WHERE $fnote LIKE ?";
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my $sql_setnum = "UPDATE $table SET $fnum = ? WHERE $fnum = ?";
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my $sql_edit = "UPDATE $table SET $fnote = ?, $fdate = ? WHERE $fnum = ?";
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my $sql_insertnew = "INSERT INTO $table VALUES (?, ?, ?)";
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my $sql_del = "DELETE FROM $table WHERE $fnum = ?";
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my $sql_del_all = "DELETE FROM $table";
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######################################################################################################
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sub new
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{
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# no prototype, because of the bin-version, which takes only a filename!
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my($this, $dbdriver, $dbname, $dbhost, $dbuser, $dbpasswd) = @_;
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my $class = ref($this) || $this;
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my $self = {};
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bless($self,$class);
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my $database = "DBI:$dbdriver:$dbname;host=$dbhost";
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$DB = DBI->connect($database, $dbuser, $dbpasswd) || die DBI->errstr();
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# LOCK the database!
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my $lock = $DB->prepare("LOCK TABLES $table WRITE") || die $DB->errstr();
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$lock->execute() || die $DB->errstr();
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return $self;
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}
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sub DESTROY
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{
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# clean the desk!
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my $unlock = $DB->prepare("UNLOCK TABLES") || die $DB->errstr;
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$unlock->execute() || die $DB->errstr();
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$DB->disconnect || die $DB->errstr;
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}
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sub version {
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return $version;
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}
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sub no_crypt {
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$NOTEDB::crypt_supported = 0;
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}
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sub use_crypt {
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my($this, $key, $method) = @_;
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if($NOTEDB::crypt_supported == 1) {
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eval {
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$cipher = new Crypt::CBC($key, $method);
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};
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if($@) {
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$NOTEDB::crypt_supported == 0;
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}
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}
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else{
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print "warning: Crypt::CBC not supported by system!\n";
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}
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}
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sub get_single
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{
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my($this, $num) = @_;
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my($note, $date);
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my $statement = $DB->prepare($sql_getsingle) || die $DB->errstr();
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$statement->execute($num) || die $DB->errstr();
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$statement->bind_columns(undef, \($note, $date)) || die $DB->errstr();
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while($statement->fetch) {
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return ude($note), ude($date);
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}
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}
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sub get_all
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{
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my($this, $num, $note, $date, %res);
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my $statement = $DB->prepare($sql_all) || die $DB->errstr();
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$statement->execute || die $DB->errstr();
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$statement->bind_columns(undef, \($num, $note, $date)) || die $DB->errstr();
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while($statement->fetch) {
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$res{$num}->{'note'} = ude($note);
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$res{$num}->{'date'} = ude($date);
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}
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return %res;
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}
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sub get_nextnum
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{
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my($this, $num);
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my $statement = $DB->prepare($sql_nextnum) || die $DB->errstr();
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$statement->execute || die $DB->errstr();
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$statement->bind_columns(undef, \($num)) || die $DB->errstr();
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while($statement->fetch) {
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return $num+1;
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}
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}
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sub get_search
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{
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my($this, $searchstring) = @_;
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my($num, $note, $date, %res);
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if($NOTEDB::crypt_supported != 1) {
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$searchstring = "\%$searchstring\%";
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my $statement = $DB->prepare($sql_search) || die $DB->errstr();
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$statement->execute($searchstring) || die $DB->errstr();
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$statement->bind_columns(undef, \($num, $note, $date))
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|| die $DB->errstr();
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while($statement->fetch) {
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$res{$num}->{'note'} = $note;
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$res{$num}->{'date'} = $date;
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}
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}
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else {
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my %res = $this->get_all();
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foreach $num (sort { $a <=> $b } keys %res) {
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$note = ude($res{$num}->{'note'});
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$date = ude($res{$num}->{'date'});
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if($note =~ /\Q$searchstring\E/i)
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{
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$res{$num}->{'note'} = $note;
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$res{$num}->{'date'} = $date;
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}
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}
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}
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return %res;
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}
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sub set_edit
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{
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my($this, $num, $note, $date) = @_;
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my $statement = $DB->prepare($sql_edit) || die $DB->errstr();
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$note =~ s/'/\'/g;
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$note =~ s/\\/\\\\/g;
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$statement->execute(uen($note), uen($date), $num) || die $DB->errstr();
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}
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sub set_new
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{
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my($this, $num, $note, $date) = @_;
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my $statement = $DB->prepare($sql_insertnew) || die $DB->errstr();
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$note =~ s/'/\'/g;
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$note =~ s/\\/\\\\/g;
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$statement->execute($num, uen($note), uen($date)) || die $DB->errstr();
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}
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sub set_del
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{
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my($this, $num) = @_;
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my($note, $date, $T);
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($note, $date) = $this->get_single($num);
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return "ERROR" if ($date !~ /^\d/);
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# delete record!
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my $statement = $DB->prepare($sql_del) || die $DB->errstr();
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$statement->execute($num) || die $DB->errstr();
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return;
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}
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sub set_del_all
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{
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my($this) = @_;
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my $statement = $DB->prepare($sql_del_all) || die $DB->errstr();
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$statement->execute() || die $DB->errstr();
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return;
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}
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sub set_recountnums
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{
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my $this = shift;
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my(@count, $i, $num, $setnum, $pos);
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$setnum = 1;
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$pos=0; $i=0; @count = ();
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my $statement = $DB->prepare($sql_incrnum) || die $DB->errstr();
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$statement->execute || die $DB->errstr();
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$statement->bind_columns(undef, \($num)) || die $DB->errstr();
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# store real id's in an array!
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while($statement->fetch) {
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$count[$i] = $num;
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$i++;
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}
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# now recount them!
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my $sub_statement = $DB->prepare($sql_setnum) || die $DB->errstr();
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for($pos=0;$pos<$i;$pos++) {
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$setnum = $pos +1;
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$sub_statement->execute($setnum,$count[$pos]) || die $DB->errstr();
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}
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}
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sub uen
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{
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my($T);
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if($NOTEDB::crypt_supported == 1) {
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eval {
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$T = pack("u", $cipher->encrypt($_[0]));
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};
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}
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else {
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$T = $_[0];
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}
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chomp $T;
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return $T;
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}
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sub ude
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{
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my($T);
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if($NOTEDB::crypt_supported == 1) {
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eval {
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$T = $cipher->decrypt(unpack("u",$_[0]))
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};
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return $T;
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}
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else {
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return $_[0];
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}
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}
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1; # keep this!
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__END__
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=head1 NAME
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NOTEDB::mysql - module lib for accessing a notedb from perl
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=head1 SYNOPSIS
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# include the module
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use NOTEDB;
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# create a new NOTEDB object (the last 4 params are db table/field names)
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$db = new NOTEDB("mysql","note","localhost","username","password","note","number","note","date");
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# get a single note
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($note, $date) = $db->get_single(1);
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# search for a certain note
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%matching_notes = $db->get_search("somewhat");
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# format of returned hash:
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#$matching_notes{$numberofnote}->{'note' => 'something', 'date' => '23.12.2000 10:33:02'}
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# get all existing notes
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%all_notes = $db->get_all();
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# format of returnes hash like the one from get_search above
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# get the next noteid available
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$next_num = $db->get_nextnum();
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# recount all noteids starting by 1 (usefull after deleting one!)
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$db->set_recountnums();
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# modify a certain note
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$db->set_edit(1, "any text", "23.12.2000 10:33:02");
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# create a new note
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$db->set_new(5, "any new text", "23.12.2000 10:33:02");
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# delete a certain note
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$db->set_del(5);
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# turn on encryption. CryptMethod must be IDEA, DES or BLOWFISH
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$db->use_crypt("passphrase", "CryptMethod");
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# turn off encryption. This is the default.
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$db->no_crypt();
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=head1 DESCRIPTION
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You can use this module for accessing a note database. There are currently
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two versions of this module, one version for a SQL database and one for a
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binary file (note's own database-format).
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However, both versions provides identical interfaces, which means, you do
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not need to change your code, if you want to switch to another database format.
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Currently, NOTEDB module is only used by note itself. But feel free to use it
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within your own project! Perhaps someone want to implement a webinterface to
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note...
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=head1 USAGE
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please see the section SYNOPSIS, it says it all.
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=head1 AUTHOR
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Thomas Linden <tom@daemon.de>.
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=cut
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