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117 lines
3.6 KiB
SQL
117 lines
3.6 KiB
SQL
-- Add parent_location_id column to locations table for hierarchical organization
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ALTER TABLE locations ADD parent_location_id INTEGER;
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-- Create recursive view for resolving location hierarchy (ancestor-descendant pairs)
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-- Used for circular reference detection and finding all descendants
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CREATE VIEW locations_resolved
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AS
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WITH RECURSIVE location_hierarchy(location_id, ancestor_location_id, level)
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AS (
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-- Base case: all locations map to themselves at level 0
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SELECT id, id, 0
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FROM locations
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UNION ALL
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-- Recursive case: find ancestors by following parent_location_id chain
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SELECT lh.location_id, l.parent_location_id, lh.level + 1
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FROM location_hierarchy lh
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JOIN locations l ON lh.ancestor_location_id = l.id
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WHERE l.parent_location_id IS NOT NULL
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LIMIT 100 -- Safety limit to prevent infinite loops
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)
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SELECT
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location_id,
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ancestor_location_id,
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level
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FROM location_hierarchy;
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-- Create view for location hierarchy display with computed path and depth
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CREATE VIEW locations_hierarchy
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AS
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WITH RECURSIVE location_tree(id, name, description, parent_location_id, is_freezer, active, row_created_timestamp, path, depth)
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AS (
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-- Base case: root locations (no parent)
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SELECT id, name, description, parent_location_id, is_freezer, active, row_created_timestamp, name, 0
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FROM locations
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WHERE parent_location_id IS NULL
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UNION ALL
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-- Recursive case: child locations
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SELECT l.id, l.name, l.description, l.parent_location_id, l.is_freezer, l.active, l.row_created_timestamp,
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lt.path || ' > ' || l.name,
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lt.depth + 1
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FROM locations l
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JOIN location_tree lt ON l.parent_location_id = lt.id
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LIMIT 100 -- Safety limit
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)
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SELECT
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id,
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name,
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description,
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parent_location_id,
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is_freezer,
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active,
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row_created_timestamp,
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path AS location_path,
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depth AS location_depth
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FROM location_tree;
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-- Trigger to enforce NULL handling for empty parent_location_id (matching product pattern)
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CREATE TRIGGER enforce_parent_location_id_null_when_empty_INS AFTER INSERT ON locations
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BEGIN
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UPDATE locations
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SET parent_location_id = NULL
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WHERE id = NEW.id
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AND IFNULL(parent_location_id, '') = '';
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END;
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CREATE TRIGGER enforce_parent_location_id_null_when_empty_UPD AFTER UPDATE ON locations
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BEGIN
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UPDATE locations
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SET parent_location_id = NULL
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WHERE id = NEW.id
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AND IFNULL(parent_location_id, '') = '';
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END;
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-- Trigger to prevent setting self as parent
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CREATE TRIGGER prevent_self_parent_location_INS BEFORE INSERT ON locations
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BEGIN
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SELECT CASE WHEN((
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SELECT 1
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WHERE NEW.parent_location_id IS NOT NULL
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AND NEW.parent_location_id = NEW.id
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) NOTNULL) THEN RAISE(ABORT, 'A location cannot be its own parent') END;
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END;
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CREATE TRIGGER prevent_self_parent_location_UPD BEFORE UPDATE ON locations
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BEGIN
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SELECT CASE WHEN((
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SELECT 1
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WHERE NEW.parent_location_id IS NOT NULL
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AND NEW.parent_location_id = NEW.id
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) NOTNULL) THEN RAISE(ABORT, 'A location cannot be its own parent') END;
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END;
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-- Trigger to prevent circular references in location hierarchy
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-- Note: Uses a subquery approach since we can't reference the view during INSERT
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CREATE TRIGGER prevent_circular_location_hierarchy_UPD BEFORE UPDATE ON locations
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WHEN NEW.parent_location_id IS NOT NULL
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BEGIN
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SELECT CASE WHEN((
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-- Check if the new parent is a descendant of this location
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-- This would create a circular reference
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WITH RECURSIVE descendants(id) AS (
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SELECT NEW.id
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UNION ALL
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SELECT l.id
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FROM locations l
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JOIN descendants d ON l.parent_location_id = d.id
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WHERE l.id != NEW.id
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LIMIT 100
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)
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SELECT 1 FROM descendants WHERE id = NEW.parent_location_id
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) NOTNULL) THEN RAISE(ABORT, 'Circular location hierarchy detected') END;
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END;
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