1 package DBIx::Class::Storage::DBI::Replication;
6 use DBIx::Class::Storage::DBI;
8 use base qw/Class::Accessor::Fast/;
10 __PACKAGE__->mk_accessors( qw/read_source write_source/ );
14 DBIx::Class::Storage::DBI::Replication - Replicated database support
18 # change storage_type in your schema class
19 $schema->storage_type( '::DBI::Replication' );
20 $schema->connect_info( [
21 [ "dbi:mysql:database=test;hostname=master", "username", "password", { AutoCommit => 1 } ], # master
22 [ "dbi:mysql:database=test;hostname=slave1", "username", "password", { priority => 10 } ], # slave1
23 [ "dbi:mysql:database=test;hostname=slave2", "username", "password", { priority => 10 } ], # slave2
25 { limit_dialect => 'LimitXY' } # If needed, see below
30 This class implements replicated data store for DBI. Currently you can define one master and numerous slave database
31 connections. All write-type queries (INSERT, UPDATE, DELETE and even LAST_INSERT_ID) are routed to master database,
32 all read-type queries (SELECTs) go to the slave database.
34 For every slave database you can define a priority value, which controls data source usage pattern. It uses
35 L<DBD::Multi>, so first the lower priority data sources used (if they have the same priority, the are used
36 randomized), than if all low priority data sources fail, higher ones tried in order.
42 If you use LIMIT in your queries (effectively, if you use SQL::Abstract::Limit), do not forget to set up limit_dialect (perldoc SQL::Abstract::Limit) by passing it as an option in the (optional) hash reference to connect_info.
43 DBIC can not set it up automatically, since it can not guess DBD::Multi connection types.
49 my $class = ref( $proto ) || $proto;
52 bless( $self, $class );
54 $self->write_source( DBIx::Class::Storage::DBI->new );
55 $self->read_source( DBIx::Class::Storage::DBI->new );
63 my @sources = ($self->read_source, $self->write_source);
65 return wantarray ? @sources : \@sources;
69 my( $self, $source_info ) = @_;
71 my $last_info = ref $source_info->[-1] eq 'HASH' ? pop( @$source_info ) : undef;
73 $self->write_source->connect_info( $source_info->[0], $last_info );
75 my @dsns = map { ($_->[3]->{priority} || 10) => $_ } @{$source_info}[1..@$source_info-1];
76 $self->read_source->connect_info( [ 'dbi:Multi:', undef, undef, { dsns => \@dsns } ], $last_info );
80 shift->read_source->select( @_ );
83 shift->read_source->select_single( @_ );
86 shift->read_source->throw_exception( @_ );
89 shift->read_source->sql_maker( @_ );
91 sub columns_info_for {
92 shift->read_source->columns_info_for( @_ );
95 shift->read_source->sqlt_type( @_ );
98 shift->read_source->create_ddl_dir( @_ );
100 sub deployment_statements {
101 shift->read_source->deployment_statements( @_ );
103 sub datetime_parser {
104 shift->read_source->datetime_parser( @_ );
106 sub datetime_parser_type {
107 shift->read_source->datetime_parser_type( @_ );
109 sub build_datetime_parser {
110 shift->read_source->build_datetime_parser( @_ );
115 $self->$_->limit_dialect( @_ ) for( $self->all_sources );
119 $self->$_->quote_char( @_ ) for( $self->all_sources );
123 $self->$_->quote_char( @_ ) for( $self->all_sources );
127 $self->$_->disconnect( @_ ) for( $self->all_sources );
132 undef $self->{write_source};
133 undef $self->{read_sources};
137 shift->write_source->last_insert_id( @_ );
140 shift->write_source->insert( @_ );
143 shift->write_source->update( @_ );
146 shift->write_source->update_all( @_ );
149 shift->write_source->delete( @_ );
152 shift->write_source->delete_all( @_ );
155 shift->write_source->create( @_ );
158 shift->write_source->find_or_create( @_ );
160 sub update_or_create {
161 shift->write_source->update_or_create( @_ );
164 shift->write_source->connected( @_ );
166 sub ensure_connected {
167 shift->write_source->ensure_connected( @_ );
170 shift->write_source->dbh( @_ );
173 shift->write_source->txn_begin( @_ );
176 shift->write_source->txn_commit( @_ );
179 shift->write_source->txn_rollback( @_ );
182 shift->write_source->sth( @_ );
185 shift->write_source->deploy( @_ );
189 sub debugfh { shift->_not_supported( 'debugfh' ) };
190 sub debugcb { shift->_not_supported( 'debugcb' ) };
193 my( $self, $method ) = @_;
195 die "This Storage does not support $method method.";
200 L<DBI::Class::Storage::DBI>, L<DBD::Multi>, L<DBI>
204 Norbert Csongrádi <bert@cpan.org>
206 Peter Siklósi <einon@einon.hu>
210 You may distribute this code under the same terms as Perl itself.