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DELIMITER $$
CREATE FUNCTION hierarchy_connect_by_iscycle(node INT) RETURNS INT
NOT DETERMINISTIC
READS SQL DATA
BEGIN
DECLARE _id INT;
DECLARE _loop INT;
DECLARE _node INT;
DECLARE EXIT HANDLER FOR NOT FOUND RETURN 0;
SET _id = COALESCE(node, @id);
SET _loop = 0;
SET _node = 0;
LOOP
SELECT parent_id
INTO _id
FROM jos_categories
WHERE id = _id;
IF _id = @start_with THEN
SET _loop := _loop + 1;
END IF;
IF _id = COALESCE(node, @id) THEN
SET _node = _node + 1;
END IF;
IF _loop >= 2 THEN
RETURN _node;
END IF;
END LOOP;
END$$
DELIMITER $$
CREATE FUNCTION hierarchy_connect_by_parent_eq_prior_id_with_level_and_loop(value INT, maxlevel INT) RETURNS INT
NOT DETERMINISTIC
READS SQL DATA
BEGIN
DECLARE _id INT;
DECLARE _parent INT;
DECLARE _next INT;
DECLARE _i INT;
DECLARE CONTINUE HANDLER FOR NOT FOUND SET @id = NULL;
SET _parent = @id;
SET _id = -1;
SET _i = 0;
IF @id IS NULL THEN
RETURN NULL;
END IF;
LOOP
SELECT MIN(id)
INTO @id
FROM jos_categories
WHERE parent_id = _parent
AND id > _id
-- Checking for @start_with in descendants
AND id <> @start_with
AND COALESCE(@level < maxlevel, TRUE);
IF @id IS NOT NULL OR _parent = @start_with THEN
SET @level = @level + 1;
RETURN @id;
END IF;
SET @level := @level - 1;
SELECT id, parent_id
INTO _id, _parent
FROM jos_categories
WHERE id = _parent;
SET _i = _i + 1;
END LOOP;
RETURN NULL;
END$$
DELIMITER $$
CREATE FUNCTION hierarchy_sys_connect_by_path(`delimiter` TEXT, node INT) RETURNS TEXT
NOT DETERMINISTIC
READS SQL DATA
BEGIN
DECLARE _path TEXT;
DECLARE _cpath TEXT;
DECLARE _id INT;
DECLARE EXIT HANDLER FOR NOT FOUND RETURN _path;
SET _id = COALESCE(node, @id);
SET _path = _id;
LOOP
SELECT parent_id
INTO _id
FROM jos_categories
WHERE id = _id
AND COALESCE(id <> @start_with, TRUE);
SET _path = CONCAT(_id, delimiter, _path);
END LOOP;
END$$
SELECT CONCAT(REPEAT(' ', lvl - 1), hi.id) AS treeitem,
hierarchy_sys_connect_by_path('/', hi.id) AS path,
parent_id, lvl,
CASE
WHEN lvl >= @maxlevel THEN 1
ELSE COALESCE(
(
SELECT 0
FROM jos_categories hl
WHERE hl.parent_id = ho.id
AND hl.id <> @start_with
LIMIT 1
), 1)
END AS is_leaf,
hierarchy_connect_by_iscycle(hi.id) AS is_cycle
FROM (
SELECT hierarchy_connect_by_parent_eq_prior_id_with_level_and_loop(id, @maxlevel) AS id,
CAST(@level AS SIGNED) AS lvl
FROM (
SELECT @start_with := 1,
@id := @start_with,
@level := 0,
@maxlevel := NULL
) vars, jos_categories
WHERE @id IS NOT NULL
) ho
JOIN jos_categories hi
ON hi.id = ho.id