The mytable-afterupdate trigger needs to insert a revision record for all descendants (not only direct children).

INSERT INTO `_revision_mysubchild` SELECT `s`.*, NEW.`_revision` FROM `mysubchild` AS `t` INNER JOIN `mychild` AS `c` ON `t`.`mychild_id` = `c`.`id` WHERE `c`.`mytable_id` = NEW.`id`;

For changing the revision the SQL would look like

DELETE `t`.* FROM `mysubchild` AS `t` INNER JOIN `mychild` AS `c` ON `t`.`mychild_id` = `c`.`id` LEFT JOIN `_revision_mysubchild` AS `r` ON 0=1 WHERE `c`.`mytable_id` = NEW.`id`;
INSERT INTO `mysubchild` SELECT `id`, `mychild_id`, `somefield` FROM `_revision_mysubchild` WHERE `_revision` = NEW.`_revision`;

Parent (id, column…)
Child (id, parent_id)
SubChild (id, child_id)

I want to do versioning only for parent table, but if I switch revision I want also child table as well as sub-child table to be switched. Is it possible to do using your script?

Thanks

The parent-child relationship is based on a foreign key constraint. MyISAM doesn’t support foreign keys, so you can’t do parent-child relationships with MyISAM tables.

To create parent/child revisioning do

php mysql-revisioning.php 'parent(child1,child2)' another_table ...

How the script know the relationship between parent and child table?

Thanks

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