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26 lines
649 B
MySQL
26 lines
649 B
MySQL
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CREATE TABLE recipes_nestings (
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id INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT UNIQUE,
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recipe_id INTEGER NOT NULL,
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includes_recipe_id INTEGER NOT NULL,
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row_created_timestamp DATETIME DEFAULT (datetime('now', 'localtime')),
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UNIQUE(recipe_id, includes_recipe_id)
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);
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CREATE VIEW recipes_nestings_resolved
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AS
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WITH RECURSIVE r1(recipe_id, includes_recipe_id)
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AS (
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SELECT id, id
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FROM recipes
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UNION ALL
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SELECT rn.recipe_id, r1.includes_recipe_id
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FROM recipes_nestings rn, r1 r1
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WHERE rn.includes_recipe_id = r1.recipe_id
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LIMIT 100 -- This is just a safety limit to prevent infinite loops due to infinite nested recipes
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)
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SELECT *
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FROM r1;
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