Looping methods in SQL cursors

Looping methods in SQL cursors

MySQL Tutorials >
Mysql> CREATE TABLE Employee (
-> 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 (0.02 sec)

Mysql>
Mysql>
mysql> INSERT INTO Employee (Id,first_name, last_name, start_date, end_date, salary, city, Description)
-> values (1, ' Jason ', ' www.111cn.net ', ' 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 (0.02 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 (0.02 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 ', ' www.111cn.net ', 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>
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>