介绍 MySQL 的 Iterate 迭代语句

mysql>
mysql>
mysql> DELIMITER //
mysql> CREATE PROCEDURE myProc (IN in_count INT)
 -> BEGIN
 -> DECLARE count INT default 0;
->
 -> increment: LOOP
 -> SET count = count + 1;
 -> IF count < 20 THEN ITERATE increment; END IF;
 -> IF count > in_count THEN LEAVE increment;
 -> END IF;
 -> END LOOP increment;
->
 -> SELECT count;
 -> END
 -> //
Query OK, 0 rows affected (0.00 sec)

mysql> DELIMITER ;
mysql>
mysql> call myProc(5);
+-------+
| count |
+-------+
| 20 |
+-------+
1 row in set (0.00 sec)

Query OK, 0 rows affected (0.00 sec)

mysql>
mysql> drop procedure myProc;
Query OK, 0 rows affected (0.00 sec)

mysql>