Mercurial > hg > orthanc-databases
view PostgreSQL/Plugins/ResourceDeletedFunc.sql @ 434:23c7af6f671a pg-transactions
DeleteResource does not need the RemainingAncestor table anymore
author | Alain Mazy <am@osimis.io> |
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date | Wed, 13 Dec 2023 16:52:06 +0100 |
parents | 5964ce6385a5 |
children | 326f8304daa1 |
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-- this script can be used either the first time we create the DB or during an upgrade DROP TRIGGER IF EXISTS ResourceDeleted ON Resources; -- The following trigger combines 2 triggers from SQLite: -- ResourceDeleted + ResourceDeletedParentCleaning CREATE OR REPLACE FUNCTION ResourceDeletedFunc() RETURNS TRIGGER AS $body$ BEGIN --RAISE NOTICE 'Delete resource %', old.parentId; INSERT INTO DeletedResources VALUES (old.resourceType, old.publicId); -- If this resource is the latest child, delete the parent DELETE FROM Resources WHERE internalId = old.parentId AND NOT EXISTS (SELECT 1 FROM Resources WHERE parentId = old.parentId); RETURN NULL; END; $body$ LANGUAGE plpgsql; CREATE TRIGGER ResourceDeleted AFTER DELETE ON Resources FOR EACH ROW EXECUTE PROCEDURE ResourceDeletedFunc(); -- we'll now use temporary tables so we need to remove the old tables ! DROP TABLE IF EXISTS DeletedFiles; DROP TABLE IF EXISTS RemainingAncestor; DROP TABLE IF EXISTS DeletedResources; CREATE OR REPLACE FUNCTION DeleteResource( IN id BIGINT, OUT remainingAncestorResourceType INTEGER, OUT remainingAncestorPublicId TEXT) AS $body$ DECLARE deleted_row RECORD; BEGIN DELETE FROM Resources WHERE internalId=id RETURNING * INTO deleted_row; -- note: there is a ResourceDeletedFunc trigger that will execute here and delete the parents if there are no remaining children + -- If this resource still has siblings, keep track of the remaining parent -- (a parent that must not be deleted but whose LastUpdate must be updated) SELECT resourceType, publicId INTO remainingAncestorResourceType, remainingAncestorPublicId FROM Resources WHERE internalId = deleted_row.parentId AND EXISTS (SELECT 1 FROM Resources WHERE parentId = deleted_row.parentId); END; $body$ LANGUAGE plpgsql;