mySQL (stored procedure) cursor infinite loop on last row - mysql

Question

I have following code: Problem is on the last row of creature_y loop doesn't end and inserts same values (with increased guid) infinitely.
I tried few ways with changing continue handler but seems it is not that.
DELIMITER $$
DROP PROCEDURE IF EXISTS creature_copy
$$
CREATE PROCEDURE creature_copy ()
BEGIN
DECLARE done INT DEFAULT 0;
DECLARE new_guid INT(10);
-- Creature definition
DECLARE y_guid INT(10);
DECLARE y_id mediumint(8);
DECLARE y_map int(5);
DECLARE y_modelid mediumint(8);
DECLARE y_position_x float(10);
DECLARE y_position_y float(10);
DECLARE y_position_z float(10);
DECLARE y_orientation float(10);
DECLARE y_spawntimesecs INT(10);
DECLARE y_curhealth INT(10);
DECLARE y_curmana INT(10);
DECLARE y_MovementType tinyint(3);
-- waypoints definition
DECLARE w_id INT(10);
DECLARE w_point mediumint(8);
DECLARE w_position_x float(10);
DECLARE w_position_y float(10);
DECLARE w_position_z float(10);
DECLARE w_orientation float(10);
-- Generate creatures map
DECLARE creature_sel CURSOR FOR
SELECT guid,id, map, modelid, position_x, position_y, position_z, orientation, spawntimesecs, curhealth, curmana, MovementType
FROM creature_y;
-- Generate waypoints map
DECLARE waypoint_sel CURSOR FOR
SELECT id, point, position_x, position_y, position_z, orientation
FROM creature_movement
WHERE creature_movement.id = y_guid;
DECLARE CONTINUE HANDLER FOR NOT FOUND SET done = 1;
OPEN creature_sel;
-- Cleanup tables before re-running
TRUNCATE creature_t;
TRUNCATE waypoint_data;
-- Set starting guid before loop
SET new_guid = 504115;
creature_loop:LOOP
if done = 1 THEN
-- set done = 0;
CLOSE creature_sel;
LEAVE creature_loop;
end if;
SET new_guid = new_guid + 1;
FETCH creature_sel INTO y_guid, y_id, y_map, y_modelid, y_position_x, y_position_y, y_position_z, y_orientation, y_spawntimesecs, y_curhealth, y_curmana, y_MovementType;
INSERT INTO creature_t(guid, id, map, modelid, position_x, position_y, position_z, orientation, spawntimesecs, curhealth, curmana, MovementType) VALUES(new_guid, y_id, y_map, y_modelid, y_position_x, y_position_y, y_position_z, y_orientation, y_spawntimesecs, y_curhealth, y_curmana, y_MovementType);
OPEN waypoint_sel;
waypoint_loop:LOOP
FETCH waypoint_sel INTO w_id, w_point, w_position_x, w_position_y, w_position_z, w_orientation;
IF done = 1 THEN
SET done = 0;
LEAVE waypoint_loop ;
END IF;
INSERT INTO waypoint_data(id, point, position_x, position_y, position_z, orientation) VALUES (new_guid, w_point, w_position_x, w_position_y, w_position_z, w_orientation);
END LOOP waypoint_loop;
CLOSE waypoint_sel;
END LOOP creature_loop;
CLOSE creature_sel;
END;

Answer 1

I have found solution to this.
To use 2 different continue handlers (to see whether cursor is at end) you need to split code into blocks
BLOCK1: BEGIN
DECLARE done INT DEFAULT 0;
-- First cursor
DECLARE sel CURSOR FOR
SELECT column
FROM table;
DECLARE CONTINUE HANDLER FOR NOT FOUND SET done = 1;
OPEN sel;
sel_loop:LOOP
if done = 1 THEN
set done = 0;
CLOSE sel;
LEAVE sel_loop;
end if;
FETCH sel INTO variable1;
-- Do something in loop
-- Start second code-block
BLOCK2: BEGIN
DECLARE done2 INT DEFAULT 0;
-- define second cursor
DECLARE sel2 CURSOR FOR
SELECT column
FROM table
WHERE column = condition;
-- define second handler
DECLARE CONTINUE HANDLER FOR NOT FOUND SET done2 = 1;
-- now you can make second cursor loop and it will finish properly.
OPEN sel2;
sel2_loop:LOOP
FETCH sel2 INTO variable2;
IF done2 = 1 THEN
SET done2 = 0;
LEAVE sel2_loop ;
END IF;
-- do something in second loop
END LOOP waypoint_loop;
CLOSE waypoint_sel;
-- End your code blocks and close first loop / cursor
END BLOCK2;
END LOOP sel_loop;
CLOSE sel;
END BLOCK1