mysql中repeat...until循环结构及游标的用法举例。
代码：

mysql> CREATE TABLE Employee( //创建数据表
    ->     id            int,
    ->     first_name    VARCHAR(15),
    ->     last_name     VARCHAR(15),
    ->     start_date    DATE,
    ->     end_date      DATE,
    ->     salary        FLOAT(8,2),
    ->     city          VARCHAR(10),
    ->     description   VARCHAR(15)
    -> );
Query OK, 0 rows affected (0.03 sec)

mysql> insert into Employee(id,first_name, last_name, start_date, end_Date,   salary,  City,       Description)
    ->              values (1,'Jason',    'Martin',  '19960725',  '20060725', 1234.56, 'Toronto',  'Programmer');
Query OK, 1 row affected (0.00 sec)

mysql>
mysql> insert into Employee(id,first_name, last_name, start_date, end_Date,   salary,  City,       Description)
    ->               values(2,'Alison',   'Mathews',  '19760321', '19860221', 6661.78, 'Vancouver','Tester');
Query OK, 1 row affected (0.00 sec)

mysql>
mysql> insert into Employee(id,first_name, last_name, start_date, end_Date,   salary,  City,       Description)
    ->               values(3,'James',    'Smith',    '19781212', '19900315', 6544.78, 'Vancouver','Tester');
Query OK, 1 row affected (0.00 sec)

mysql>
mysql> insert into Employee(id,first_name, last_name, start_date, end_Date,   salary,  City,       Description)
    ->               values(4,'Celia',    'Rice',     '19821024', '19990421', 2344.78, 'Vancouver','Manager');
Query OK, 1 row affected (0.00 sec)

mysql>
mysql> insert into Employee(id,first_name, last_name, start_date, end_Date,   salary,  City,       Description)
    ->               values(5,'Robert',   'Black',    '19840115', '19980808', 2334.78, 'Vancouver','Tester');
Query OK, 1 row affected (0.00 sec)

mysql>
mysql> insert into Employee(id,first_name, last_name, start_date, end_Date,   salary,  City,       Description)
    ->               values(6,'Linda',    'Green',    '19870730', '19960104', 4322.78,'New York',  'Tester');
Query OK, 1 row affected (0.00 sec)

mysql>
mysql> insert into Employee(id,first_name, last_name, start_date, end_Date,   salary,  City,       Description)
    ->               values(7,'David',    'Larry',    '19901231', '19980212', 7897.78,'New York',  'Manager');
Query OK, 1 row affected (0.00 sec)

mysql>
mysql> insert into Employee(id,first_name, last_name, start_date, end_Date,   salary,  City,       Description)
    ->               values(8,'James',    'Cat',     '19960917',  '20020415', 1232.78,'Vancouver', 'Tester');
Query OK, 1 row affected (0.00 sec)

mysql>
mysql> select * from Employee;
+------+------------+-----------+------------+------------+---------+-----------+-------------+
| id   | first_name | last_name | start_date | end_date   | salary  | city      | description |
+------+------------+-----------+------------+------------+---------+-----------+-------------+
|    1 | Jason      | Martin    | 1996-07-25 | 2006-07-25 | 1234.56 | Toronto   | Programmer  |
|    2 | Alison     | Mathews   | 1976-03-21 | 1986-02-21 | 6661.78 | Vancouver | Tester      |
|    3 | James      | Smith     | 1978-12-12 | 1990-03-15 | 6544.78 | Vancouver | Tester      |
|    4 | Celia      | Rice      | 1982-10-24 | 1999-04-21 | 2344.78 | Vancouver | Manager     |
|    5 | Robert     | Black     | 1984-01-15 | 1998-08-08 | 2334.78 | Vancouver | Tester      |
|    6 | Linda      | Green     | 1987-07-30 | 1996-01-04 | 4322.78 | New York  | Tester      |
|    7 | David      | Larry     | 1990-12-31 | 1998-02-12 | 7897.78 | New York  | Manager     |
|    8 | James      | Cat       | 1996-09-17 | 2002-04-15 | 1232.78 | Vancouver | Tester      |
+------+------------+-----------+------------+------------+---------+-----------+-------------+
8 rows in set (0.00 sec)

mysql> delimiter $$
mysql> CREATE PROCEDURE myProc (in_customer_id INT) //创建存储过程
    -> BEGIN
    ->
    ->      DECLARE l_first_name  VARCHAR(30);
    ->      DECLARE l_id          INT;
    ->      DECLARE l_city        VARCHAR(30);
    ->      DECLARE l_department_count INT;
    ->      DECLARE no_more_departments INT;
    ->
    ->      DECLARE dept_csr CURSOR FOR //游标
    ->           SELECT id,first_name, city
    ->             FROM employee;
    ->
    ->      DECLARE CONTINUE HANDLER FOR NOT FOUND SET no_more_departments=1;
    ->
    ->      SET no_more_departments=0;
    ->      OPEN dept_csr;
    ->      dept_loop:REPEAT //repeat循环结构
    ->           FETCH dept_csr INTO l_id,l_first_name,l_city;
    ->               IF no_more_departments=0 THEN
    ->                 SET l_department_count=l_department_count+1;
    ->               END IF;
    ->           select  l_id,l_first_name,l_city;
    ->      UNTIL no_more_departments
    ->      END REPEAT dept_loop;
    ->      CLOSE dept_csr;
    ->      SET no_more_departments=0;
    ->
    ->
    -> END$$
Query OK, 0 rows affected (0.00 sec)

mysql> delimiter ;
mysql>
mysql> call myProc(1);
+------+--------------+---------+
| l_id | l_first_name | l_city  |
+------+--------------+---------+
|    1 | Jason        | Toronto |
+------+--------------+---------+
1 row in set (0.02 sec)

+------+--------------+-----------+
| l_id | l_first_name | l_city    |
+------+--------------+-----------+
|    2 | Alison       | Vancouver |
+------+--------------+-----------+
1 row in set (0.02 sec)

+------+--------------+-----------+
| l_id | l_first_name | l_city    |
+------+--------------+-----------+
|    3 | James        | Vancouver |
+------+--------------+-----------+
1 row in set (0.02 sec)

+------+--------------+-----------+
| l_id | l_first_name | l_city    |
+------+--------------+-----------+
|    4 | Celia        | Vancouver |
+------+--------------+-----------+
1 row in set (0.02 sec)

+------+--------------+-----------+
| l_id | l_first_name | l_city    |
+------+--------------+-----------+
|    5 | Robert       | Vancouver |
+------+--------------+-----------+
1 row in set (0.02 sec)

+------+--------------+----------+
| l_id | l_first_name | l_city   |
+------+--------------+----------+
|    6 | Linda        | New York |
+------+--------------+----------+
1 row in set (0.02 sec)

+------+--------------+----------+
| l_id | l_first_name | l_city   |
+------+--------------+----------+
|    7 | David        | New York |
+------+--------------+----------+
1 row in set (0.03 sec)

+------+--------------+-----------+
| l_id | l_first_name | l_city    |
+------+--------------+-----------+
|    8 | James        | Vancouver |
+------+--------------+-----------+
1 row in set (0.03 sec)

+------+--------------+-----------+
| l_id | l_first_name | l_city    |
+------+--------------+-----------+
|    8 | James        | Vancouver |
+------+--------------+-----------+
1 row in set (0.38 sec)

Query OK, 0 rows affected (0.38 sec)

mysql> drop procedure myProc; //删除存储过程
Query OK, 0 rows affected (0.02 sec)

mysql> drop table Employee; //删除表
Query OK, 0 rows affected (0.00 sec)