MySQL 嵌套存储过程 实例

数据库表准备：

DROP TABLE IF EXISTS `test`.`athlete`;
CREATE TABLE `test`.`athlete` (
`athleteId` int(11) NOT NULL AUTO_INCREMENT,
`firstname` varchar(20) COLLATE utf8_unicode_ci NOT NULL,
`lastname` varchar(20) COLLATE utf8_unicode_ci NOT NULL,
`country` varchar(50) COLLATE utf8_unicode_ci NOT NULL,
`gender` char(1) COLLATE utf8_unicode_ci NOT NULL,
`dateOfBirth` date NOT NULL,
PRIMARY KEY (`athleteId`)
) ENGINE=InnoDB AUTO_INCREMENT=4 DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci;

数据准备：

INSERT INTO athlete
()
VALUES
(1, 'zhang', 'jiawei', 'China', 'm', '2010/9/21');

INSERT INTO athlete
()
VALUES
(2, 'zhang', 'java', 'China', 'm', '2010/9/11');

INSERT INTO athlete
()
VALUES
(3, 'li', 'wi', 'USA', 'f', '2010/9/19');

存储过程源代码：

DELIMITER $$

DROP PROCEDURE IF EXISTS `test`.`sp_cursor`$$
CREATE DEFINER=`root`@`localhost` PROCEDURE `test`.`sp_cursor`()
begin
declare a int default 0;
declare b varchar(20) ;
declare cursor_flag int default 0;
declare cur_a cursor for select lastname from test.athlete;
declare continue handler for NOT FOUND set cursor_flag=1;
open cur_a;
fetch cur_a into b ;
while cursor_flag = 0 do
select b;
set a=a+1;
begin
declare birthday date ;
declare cur_b_flag int default 0;
declare cur_b cursor for select dateofbirth from test.athlete where lastname = b;
declare continue handler for NOT FOUND set cur_b_flag =1;
open cur_b;
fetch cur_b into birthday;
select 'cur_b',birthday;
close cur_b;
end;
fetch next from cur_a into b ;
end while;
close cur_a;
select a;
commit;
end $$

DELIMITER ;

测试执行结果：

mysql> call test.sp_cursor();
+--------+
| b |
+--------+
| jiawei |
+--------+
1 row in set

+-------+------------+
| cur_b | birthday |
+-------+------------+
| cur_b | 2010-09-21 |
+-------+------------+
1 row in set

+------+
| b |
+------+
| java |
+------+
1 row in set

+-------+------------+
| cur_b | birthday |
+-------+------------+
| cur_b | 2010-09-11 |
+-------+------------+
1 row in set

+----+
| b |
+----+
| wi |
+----+
1 row in set

+-------+------------+
| cur_b | birthday |
+-------+------------+
| cur_b | 2010-09-19 |
+-------+------------+
1 row in set

+---+
| a |
+---+
| 3 |
+---+
1 row in set

Query OK, 0 rows affected。

完全正确！！

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