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 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.
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.
DBI::Class::Storage::DBI, DBD::Multi, DBI
Norbert Csongrádi <bert@cpan.org>
Peter Siklósi <einon@einon.hu>
You may distribute this code under the same terms as Perl itself.
1 POD Error
The following errors were encountered while parsing the POD:
Non-ASCII character seen before =encoding in 'Csongrádi'. Assuming CP1252
To install DBIx::Class, copy and paste the appropriate command in to your terminal.
cpanm
cpanm DBIx::Class
CPAN shell
perl -MCPAN -e shell install DBIx::Class
For more information on module installation, please visit the detailed CPAN module installation guide.