=head1 NAME
-DBIx::Class::Storage::DBI::Replication - Replicated database support
+DBIx::Class::Storage::DBI::Replication - EXPERIMENTAL Replicated database support
=head1 SYNOPSIS
[ "dbi:mysql:database=test;hostname=master", "username", "password", { AutoCommit => 1 } ], # master
[ "dbi:mysql:database=test;hostname=slave1", "username", "password", { priority => 10 } ], # slave1
[ "dbi:mysql:database=test;hostname=slave2", "username", "password", { priority => 10 } ], # slave2
- <...>
+ <...>,
+ { limit_dialect => 'LimitXY' } # If needed, see below
] );
=head1 DESCRIPTION
-This class implements replicated data store for DBI. Currently you can define one master and numerous slave database
-connections. All write-type queries (INSERT, UPDATE, DELETE and even LAST_INSERT_ID) are routed to master database,
-all read-type queries (SELECTs) go to the slave database.
+Warning: This class is marked EXPERIMENTAL. It works for the authors but does
+not currently have automated tests so your mileage may vary.
-For every slave database you can define a priority value, which controls data source usage pattern. It uses
-L<DBD::Multi>, so first the lower priority data sources used (if they have the same priority, the are used
-randomized), than if all low priority data sources fail, higher ones tried in order.
+This class implements replicated data store for DBI. Currently you can define
+one master and numerous slave database connections. All write-type queries
+(INSERT, UPDATE, DELETE and even LAST_INSERT_ID) are routed to master
+database, all read-type queries (SELECTs) go to the slave database.
+
+For every slave database you can define a priority value, which controls data
+source usage pattern. It uses L<DBD::Multi>, so first the lower priority data
+sources used (if they have the same priority, the are used randomized), than
+if all low priority data sources fail, higher ones tried in order.
+
+=head1 CONFIGURATION
+
+=head2 Limit dialect
+
+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. DBIC can not set it up automatically, since it can
+not guess DBD::Multi connection types.
=cut
sub new {
my $proto = shift;
my $class = ref( $proto ) || $proto;
- my $self = {
- read_sources => [],
- read_iterator => 0,
- };
+ my $self = {};
bless( $self, $class );
sub all_sources {
my $self = shift;
- my @sources = ($self->{read_source}, $self->write_source);
+ my @sources = ($self->read_source, $self->write_source);
return wantarray ? @sources : \@sources;
}
sub connect_info {
my( $self, $source_info ) = @_;
- $self->write_source->connect_info( $source_info->[0] );
+ my( $info, $global_options, $options, @dsns );
+
+ $info = [ @$source_info ];
- my @dsns = map { ($_->[3]->{priority} || 10) => $_ } @{$source_info}[1..@$source_info-1];
- $self->read_source->connect_info( [ 'dbi:Multi:', undef, undef, { dsns => \@dsns } ] );
+ $global_options = ref $info->[-1] eq 'HASH' ? pop( @$info ) : {};
+ if( ref( $options = $info->[0]->[-1] ) eq 'HASH' ) {
+ # Local options present in dsn, merge them with global options
+ map { $global_options->{$_} = $options->{$_} } keys %$options;
+ pop @{$info->[0]};
+ }
+
+ # We need to copy-pass $global_options, since connect_info clears it while
+ # processing options
+ $self->write_source->connect_info( @{$info->[0]}, { %$global_options } );
+
+ @dsns = map { ($_->[3]->{priority} || 10) => $_ } @{$info->[0]}[1..@{$info->[0]}-1];
+ $global_options->{dsns} = \@dsns;
+
+ $self->read_source->connect_info( [ 'dbi:Multi:', undef, undef, { %$global_options } ] );
}
sub select {
- return shift->read_source()->select( @_ );
+ shift->read_source->select( @_ );
}
sub select_single {
- return shift->read_source()->select_single( @_ );
+ shift->read_source->select_single( @_ );
}
sub throw_exception {
- return shift->read_source()->throw_exception( @_ );
+ shift->read_source->throw_exception( @_ );
}
sub sql_maker {
- return shift->read_source()->sql_maker( @_ );
+ shift->read_source->sql_maker( @_ );
}
sub columns_info_for {
- return shift->read_source()->columns_info_for( @_ );
+ shift->read_source->columns_info_for( @_ );
}
sub sqlt_type {
- return shift->read_source()->sqlt_type( @_ );
+ shift->read_source->sqlt_type( @_ );
}
sub create_ddl_dir {
- return shift->read_source()->create_ddl_dir( @_ );
+ shift->read_source->create_ddl_dir( @_ );
}
sub deployment_statements {
- return shift->read_source()->deployment_statements( @_ );
+ shift->read_source->deployment_statements( @_ );
}
sub datetime_parser {
- return shift->read_source()->datetime_parser( @_ );
+ shift->read_source->datetime_parser( @_ );
}
sub datetime_parser_type {
- return shift->read_source()->datetime_parser_type( @_ );
+ shift->read_source->datetime_parser_type( @_ );
}
sub build_datetime_parser {
- return shift->read_source()->build_datetime_parser( @_ );
+ shift->read_source->build_datetime_parser( @_ );
}
-sub limit_dialect {
- my $self = shift;
- $self->$_->limit_dialect( @_ ) for( $self->all_sources() );
-}
-sub quote_char {
- my $self = shift;
- $self->$_->quote_char( @_ ) for( $self->all_sources() );
-}
-sub name_sep {
- my $self = shift;
- $self->$_->quote_char( @_ ) for( $self->all_sources() );
-}
-sub disconnect {
- my $self = shift;
- $self->$_->disconnect( @_ ) for( $self->all_sources() );
-}
+sub limit_dialect { $_->limit_dialect( @_ ) for( shift->all_sources ) }
+sub quote_char { $_->quote_char( @_ ) for( shift->all_sources ) }
+sub name_sep { $_->quote_char( @_ ) for( shift->all_sources ) }
+sub disconnect { $_->disconnect( @_ ) for( shift->all_sources ) }
+sub set_schema { $_->set_schema( @_ ) for( shift->all_sources ) }
+
sub DESTROY {
my $self = shift;
- $self->{write_source} = undef;
- $self->{read_sources} = undef;
+ undef $self->{write_source};
+ undef $self->{read_sources};
}
sub last_insert_id {
- return shift->write_source()->last_insert_id( @_ );
+ shift->write_source->last_insert_id( @_ );
}
sub insert {
- return shift->write_source()->insert( @_ );
+ shift->write_source->insert( @_ );
}
sub update {
- return shift->write_source()->update( @_ );
+ shift->write_source->update( @_ );
}
sub update_all {
- return shift->write_source()->update_all( @_ );
+ shift->write_source->update_all( @_ );
}
sub delete {
- return shift->write_source()->delete( @_ );
+ shift->write_source->delete( @_ );
}
sub delete_all {
- return shift->write_source()->delete_all( @_ );
+ shift->write_source->delete_all( @_ );
}
sub create {
- return shift->write_source()->create( @_ );
+ shift->write_source->create( @_ );
}
sub find_or_create {
- return shift->write_source()->find_or_create( @_ );
+ shift->write_source->find_or_create( @_ );
}
sub update_or_create {
- return shift->write_source()->update_or_create( @_ );
+ shift->write_source->update_or_create( @_ );
}
sub connected {
- return shift->write_source()->connected( @_ );
+ shift->write_source->connected( @_ );
}
sub ensure_connected {
- return shift->write_source()->ensure_connected( @_ );
+ shift->write_source->ensure_connected( @_ );
}
sub dbh {
- return shift->write_source()->dbh( @_ );
+ shift->write_source->dbh( @_ );
}
sub txn_begin {
- return shift->write_source()->txn_begin( @_ );
+ shift->write_source->txn_begin( @_ );
}
sub txn_commit {
- return shift->write_source()->txn_commit( @_ );
+ shift->write_source->txn_commit( @_ );
}
sub txn_rollback {
- return shift->write_source()->txn_rollback( @_ );
+ shift->write_source->txn_rollback( @_ );
}
sub sth {
- return shift->write_source()->sth( @_ );
+ shift->write_source->sth( @_ );
}
sub deploy {
- return shift->write_source()->deploy( @_ );
+ shift->write_source->deploy( @_ );
}
Norbert Csongrádi <bert@cpan.org>
-Peter Siklósi <einon@ahq.hu>
+Peter Siklósi <einon@einon.hu>
=head1 LICENSE
projects / dbsrgits/DBIx-Class.git / blobdiff