KiokuDB::Backend::Role::TXN - Backend level transaction support.

       Yuval Kogman <nothingmuch@woobling.org>

       This software is copyright (c) 2014 by Yuval Kogman, Infinity Interactive.

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

perl v5.34.0                                       2022-05-23                   KiokuDB::Backend::Role::TXN(3pm)

       This API is inspired by standard database transactions much like you get with DBI.

       This is the low level interface required by "txn_do" in KiokuDB.

       KiokuDB::Backend::Role::TXN - Backend level transaction support.

       txn_do $code, %callbacks
           This  method should evaluate the code reference in the context of a transaction, inside an "eval". If
           any errors are caught the transaction should be aborted, otherwise it should be committed.   This  is
           much like "txn_do" in DBIx::Class::Schema.

           The "rollback" callback should be fired when the transaction will be aborted.

       txn_begin [ $parent_txn ]
           Begin a new transaction.

           This  method  can  return  a  transaction  handle  that  will  later  be  passed  to  "txn_commit" or
           "txn_rollback" as necessary.

           The current handle will be passed to nested calls to "txn_begin".

       txn_commit $txn
           Commit the transaction.

       txn_rollback $txn
           Rollback the transaction.

           package MyBackend;
           use Moose;

           with qw(
               KiokuDB::Backend
               KiokuDB::Backend::Role::TXN
           );

           sub txn_begin { ... }
           sub txn_commit { ... }
           sub txn_rollback { ... }

       version 0.57