METHODS THAT ARE REQUIRED IN SUBCLASSES

deploy

See ``deploy'' in DBIx::Class::DeploymentHandler::HandlesDeploy.

version_storage_is_installed

See ``version_storage_is_installed'' in DBIx::Class::DeploymentHandler::HandlesVersionStorage.

add_database_version

See ``add_database_version'' in DBIx::Class::DeploymentHandler::HandlesVersionStorage.

delete_database_version

See ``delete_database_version'' in DBIx::Class::DeploymentHandler::HandlesVersionStorage.

next_version_set

See ``next_version_set'' in DBIx::Class::DeploymentHandler::HandlesVersioning.

previous_version_set

See ``previous_version_set'' in DBIx::Class::DeploymentHandler::HandlesVersioning.

upgrade_single_step

See ``upgrade_single_step'' in DBIx::Class::DeploymentHandler::HandlesDeploy.

downgrade_single_step

See ``downgrade_single_step'' in DBIx::Class::DeploymentHandler::HandlesDeploy.

txn_do

See ``txn_do'' in DBIx::Class::DeploymentHandler::HandlesDeploy.

ORTHODOX METHODS

These methods are not actually required as things will probably still work if you don't implement them, but if you want your subclass to get along with other subclasses (or more likely, tools made to use another subclass), you should probably implement these too, even if they are no-ops.

database_version

see ``database_version'' in DBIx::Class::DeploymentHandler::HandlesVersionStorage

prepare_deploy

see ``prepare_deploy'' in DBIx::Class::DeploymentHandler::HandlesDeploy

prepare_resultsource_install

see ``prepare_resultsource_install'' in DBIx::Class::DeploymentHandler::HandlesDeploy

install_resultsource

see ``install_resultsource'' in DBIx::Class::DeploymentHandler::HandlesDeploy

prepare_upgrade

see ``prepare_upgrade'' in DBIx::Class::DeploymentHandler::HandlesDeploy

prepare_downgrade

see ``prepare_downgrade'' in DBIx::Class::DeploymentHandler::HandlesDeploy

SUBCLASSING

All of the methods mentioned in ``METHODS THAT ARE REQUIRED IN SUBCLASSES'' and ``ORTHODOX METHODS'' can be implemented in any fashion you choose. In the spirit of code reuse I have used roles to implement them in my two subclasses, DBIx::Class::DeploymentHandler and DBIx::Class::DeploymentHandler::Deprecated, but you are free to implement them entirely in a subclass if you so choose to.

For in-depth documentation on how methods are supposed to work, see the roles DBIx::Class::DeploymentHandler::HandlesDeploy, DBIx::Class::DeploymentHandler::HandlesVersioning, and DBIx::Class::DeploymentHandler::HandlesVersionStorage.

ATTRIBUTES

schema

The DBIx::Class::Schema (required) that is used to talk to the database and generate the DDL.

schema_version

The version that the schema is currently at. Defaults to "$self->schema->schema_version".

backup_directory

The directory where backups are stored

to_version

The version (defaults to schema's version) to migrate the database to

METHODS

install

 $dh->install

or

 $dh->install({ version => 1 })

Deploys the requested version into the database Version defaults to ``schema_version''. Populates "version_storage" with "version" and "ddl".

Note: you typically need to call "$dh->prepare_deploy" before you call this method.

Note: you cannot install on top of an already installed database

upgrade

 $dh->upgrade

Upgrades the database one step at a time till ``next_version_set'' returns "undef". Each upgrade step will add a "version", "ddl", and "upgrade_sql" to the version storage (if "ddl" and/or "upgrade_sql" are returned from ``upgrade_single_step''.

downgrade

 $dh->downgrade

Downgrades the database one step at a time till ``previous_version_set'' returns "undef". Each downgrade step will delete a "version" from the version storage.

backup

 $dh->backup

Simply calls backup on the "$schema->storage", passing in "$self->backup_directory" as an argument. Please test yourself before assuming it will work.

AUTHOR

Arthur Axel ``fREW'' Schmidt <[email protected]>

COPYRIGHT AND LICENSE

This software is copyright (c) 2015 by Arthur Axel ``fREW'' Schmidt.

This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself.