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package Wiki::Toolkit::Store::MySQL; |
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1280
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use strict; |
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use vars qw( @ISA $VERSION ); |
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use Wiki::Toolkit::Store::Database; |
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use Carp qw/carp croak/; |
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@ISA = qw( Wiki::Toolkit::Store::Database ); |
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$VERSION = 0.05; |
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=head1 NAME |
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Wiki::Toolkit::Store::MySQL - MySQL storage backend for Wiki::Toolkit |
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=head1 REQUIRES |
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Subclasses Wiki::Toolkit::Store::Database. |
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=head1 SYNOPSIS |
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See Wiki::Toolkit::Store::Database |
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=cut |
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# Internal method to return the data source string required by DBI. |
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sub _dsn { |
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my ($self, $dbname, $dbhost, $dbport) = @_; |
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my $dsn = "dbi:mysql:$dbname"; |
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$dsn .= ";host=$dbhost" if $dbhost; |
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$dsn .= ";port=$dbport" if $dbport; |
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return $dsn; |
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} |
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=head1 METHODS |
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=over 4 |
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=item B |
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$store->check_and_write_node( node => $node, |
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checksum => $checksum, |
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%other_args ); |
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Locks the node, verifies the checksum, calls |
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C with all supplied arguments, unlocks the |
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node. Returns the version of the updated node on successful writing, 0 if |
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checksum doesn't match, -1 if the change was not applied, croaks on error. |
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Note: Uses MySQL's user level locking, so any locks are released when |
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the database handle disconnects. Doing it like this because I can't seem |
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to get it to work properly with transactions. |
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=back |
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=cut |
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sub check_and_write_node { |
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my ($self, %args) = @_; |
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my ($node, $checksum) = @args{qw( node checksum )}; |
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$self->_lock_node($node) or croak "Can't lock node"; |
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my $ok = $self->verify_checksum($node, $checksum); |
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unless ($ok) { |
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$self->_unlock_node($node) or carp "Can't unlock node"; |
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return 0; |
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} |
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$ok = $self->write_node_post_locking( %args ); |
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$self->_unlock_node($node) or carp "Can't unlock node"; |
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return $ok; |
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} |
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# Returns 1 if we can get a lock, 0 if we can't, croaks on error. |
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sub _lock_node { |
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my ($self, $node) = @_; |
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my $dbh = $self->{_dbh}; |
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$node = $dbh->quote($node); |
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my $sql = "SELECT GET_LOCK($node, 10)"; |
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my $sth = $dbh->prepare($sql); |
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$sth->execute or croak $dbh->errstr; |
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my $locked = $sth->fetchrow_array; |
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$sth->finish; |
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return $locked; |
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} |
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# Returns 1 if we can unlock, 0 if we can't, croaks on error. |
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sub _unlock_node { |
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my ($self, $node) = @_; |
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my $dbh = $self->{_dbh}; |
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$node = $dbh->quote($node); |
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my $sql = "SELECT RELEASE_LOCK($node)"; |
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my $sth = $dbh->prepare($sql); |
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$sth->execute or croak $dbh->errstr; |
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my $unlocked = $sth->fetchrow_array; |
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$sth->finish; |
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return $unlocked; |
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} |
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sub _get_casesensitive_compare_sql { |
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my ($self, $column) = @_; |
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return "BINARY $column = ?"; |
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} |
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1; |