DBIx::Class::Storage::DBI::Replication - EXPERIMENTAL Replicated database support


DBIx::Class::Storage::DBI::Replication - EXPERIMENTAL Replicated database support


  # change storage_type in your schema class
    $schema->storage_type( '::DBI::Replication' );
    $schema->connect_info( [
                     [ "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
                    ] );


Warning: This class is marked EXPERIMENTAL. It works for the authors but does not currently have automated tests so your mileage may vary.

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 the DBD::Multi manpage, 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.


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.


the DBI::Class::Storage::DBI manpage, the DBD::Multi manpage, the DBI manpage


Norbert Csongrádi <bert@cpan.org>

Peter Siklósi <einon@einon.hu>


You may distribute this code under the same terms as Perl itself.

 DBIx::Class::Storage::DBI::Replication - EXPERIMENTAL Replicated database support