mysql 遍历方式

BEGIN

DECLARE i INT DEFAULT 0;
# WHILE
WHILE i < 5 DO
    SET i = i + 1;
END WHILE;
# SELECT i;

# LOOP
optLoop:LOOP
IF i > 10 THEN
    LEAVE optLoop;
END IF;
    SET i = i + 1;
END LOOP;
# SELECT i;

# REPEAT
REPEAT 
    SET i = i + 1;
UNTIL i > 15 END REPEAT;
SELECT i;

END