sql游标中循环使用方法
sql游标中循环使用方法
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>
mysql>
mysql>
mysql> delimiter $$
mysql> CREATE PROCEDURE myProc (in_customer_id INT)
-> BEGIN
->
-> DECLARE l_first_name VARCHAR(30);
-> DECLARE l_id INT;
-> DECLARE l_city VARCHAR(30);
-> DECLARE l_department_count INT;
-> DECLARE no_more_departments INT;
->
-> DECLARE dept_csr CURSOR FOR
-> SELECT id,first_name, city
-> FROM employee;
->
-> DECLARE CONTINUE HANDLER FOR NOT FOUND SET no_more_departments=1;
->
-> SET no_more_departments=0;
-> OPEN dept_csr;
-> dept_loop:WHILE(no_more_departments=0) DO
-> FETCH dept_csr INTO l_id,l_first_name,l_city;
-> IF no_more_departments=1 THEN
-> LEAVE dept_loop;
-> END IF;
-> SET l_department_count=l_department_count 1;
-> select l_id,l_first_name,l_city;
-> END WHILE dept_loop;
-> CLOSE dept_csr;
-> SET no_more_departments=0;
->
-> END$$
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 (0.01 sec)------ -------------- -----------
| l_id | l_first_name | l_city |
------ -------------- -----------
| 2 | Alison | Vancouver |
------ -------------- -----------
1 row in set (0.01 sec)------ -------------- -----------
| l_id | l_first_name | l_city |
------ -------------- -----------
| 3 | James | Vancouver |
------ -------------- -----------
1 row in set (0.01 sec)------ -------------- -----------
| l_id | l_first_name | l_city |
------ -------------- -----------
| 4 | Celia | Vancouver |
------ -------------- -----------
1 row in set (0.01 sec)------ -------------- -----------
| l_id | l_first_name | l_city |
------ -------------- -----------
| 5 | Robert | Vancouver |
------ -------------- -----------
1 row in set (0.01 sec)------ -------------- ----------
| l_id | l_first_name | l_city |
------ -------------- ----------
| 6 | Linda | New York |
------ -------------- ----------
1 row in set (0.01 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)Query OK, 0 rows affected (0.03 sec)
mysql>
mysql>
mysql> drop procedure myProc;
Query OK, 0 rows affected (0.00 sec)mysql>
mysql>
mysql>
mysql>
mysql>
mysql> drop table Employee;
Query OK, 0 rows affected (0.00 sec)mysql>
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