28 lines
940 B
MySQL
28 lines
940 B
MySQL
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-- Store root ids of all existing items
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UPDATE "Item"
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SET "rootId" = ltree2text(subltree(path, 0, 1))::integer
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WHERE "parentId" IS NOT NULL;
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CREATE OR REPLACE FUNCTION update_item_path() RETURNS TRIGGER AS $$
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DECLARE
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npath ltree;
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root_id INTEGER;
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BEGIN
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IF NEW."parentId" IS NULL THEN
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SELECT NEW.id::text::ltree INTO npath;
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NEW."path" = npath;
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ELSEIF TG_OP = 'INSERT' OR OLD."parentId" IS NULL OR OLD."parentId" != NEW."parentId" THEN
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SELECT "path" || NEW.id::text, ltree2text(subltree("path", 0, 1))::integer
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FROM "Item"
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WHERE id = NEW."parentId"
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INTO npath, root_id;
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IF npath IS NULL THEN
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RAISE EXCEPTION 'Invalid parent_id %', NEW."parentId";
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END IF;
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NEW."path" = npath;
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NEW."rootId" = root_id;
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END IF;
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RETURN NEW;
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END;
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$$ LANGUAGE plpgsql;
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