SQL/MySQL/Cursor/Fetch

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Fetch a cursor

   <source lang="sql">

mysql> 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 (0.01 sec) mysql> mysql> 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 (0.01 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> mysql> mysql> mysql> delimiter $$ mysql> mysql> CREATE PROCEDURE myProc (in_customer_id INT)

   -> BEGIN
   ->
   ->     DECLARE l_last_row_fetched int;
   ->     DECLARE l_id int;
   ->     DECLARE l_first_name VARCHAR(30);
   ->     DECLARE l_last_name VARCHAR(30);
   ->
   ->
   ->     DECLARE c1 CURSOR FOR
   ->       SELECT id,first_name, last_name
   ->         FROM employee
   ->        WHERE id=in_customer_id;
   ->
   ->     DECLARE CONTINUE HANDLER FOR NOT FOUND SET l_last_row_fetched=1;
   ->
   ->     SET l_last_row_fetched=0;
   ->
   ->
   ->     OPEN c1;
   ->     cursor_loop:LOOP
   ->          FETCH c1 INTO l_id,l_first_name,l_last_name;
   ->          IF l_last_row_fetched=1 THEN
   ->               LEAVE cursor_loop;
   ->          END IF;
   ->          /*Do something with the row fetched*/
   ->     END LOOP cursor_loop;
   ->     CLOSE c1;
   ->     SET l_last_row_fetched=0;
   ->
   ->
   ->
   -> END$$

Query OK, 0 rows affected (0.02 sec) mysql> delimiter ; mysql> mysql> call myProc(1); Query OK, 0 rows affected (0.00 sec) mysql> drop procedure myProc; Query OK, 0 rows affected (0.00 sec) mysql> mysql> mysql> mysql> mysql> drop table Employee; Query OK, 0 rows affected (0.00 sec) mysql> mysql>

       </source>
   
  


FETCH Statement

   <source lang="sql">

mysql> mysql> 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 (0.03 sec) mysql> mysql> 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 (0.01 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> mysql> DELIMITER // mysql> CREATE FUNCTION city_list() RETURNS VARCHAR(255)

   -> BEGIN
   ->
   ->         DECLARE finished INTEGER DEFAULT 0;
   ->         DECLARE city_name VARCHAR(50) DEFAULT "";
   ->         DECLARE list VARCHAR(255) DEFAULT "";
   ->         DECLARE city_cur CURSOR FOR SELECT city FROM employee;
   ->         DECLARE CONTINUE HANDLER FOR NOT FOUND SET finished = 1;
   ->
   ->         OPEN city_cur;
   ->
   ->         get_city: LOOP
   ->                 FETCH city_cur INTO city_name;
   ->                 IF finished THEN
   ->                         LEAVE get_city;
   ->                 END IF;
   ->                 SET list = CONCAT(list,", ",city_name);
   ->         END LOOP get_city;
   ->
   ->         CLOSE city_cur;
   ->
   ->         RETURN SUBSTR(list,3);
   -> END
   -> //

Query OK, 0 rows affected (0.00 sec) mysql> DELIMITER ; mysql> mysql> SELECT city_list() AS cities; +------------------------------------------------------------------------------------+ | cities | +------------------------------------------------------------------------------------+ | Toronto, Vancouver, Vancouver, Vancouver, Vancouver, New York, New York, Vancouver | +------------------------------------------------------------------------------------+ 1 row in set (0.00 sec) mysql> mysql> drop function city_list; Query OK, 0 rows affected (0.02 sec) mysql> mysql> mysql> mysql> drop table Employee; Query OK, 0 rows affected (0.00 sec)

       </source>
   
  


Insert data from a cursor

   <source lang="sql">

mysql> 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 (0.03 sec) mysql> mysql> 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 (0.02 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 (0.00 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> mysql> mysql> mysql> delimiter $$ mysql> mysql> CREATE PROCEDURE myProc

   ->        (p_first_name         varchar(30),
   ->         p_last_name          VARCHAR(30),
   ->         p_city               VARCHAR(30),
   ->         p_description        varchar(30),
   ->         out p_sqlcode        int,
   ->         out p_status_message varchar(100))
   ->   MODIFIES SQL DATA
   -> BEGIN
   ->
   ->      DECLARE l_manager_id       INT;
   ->      DECLARE csr_mgr_id cursor for
   ->           SELECT id
   ->               FROM employee
   ->             WHERE first_name=p_first_name AND last_name=p_last_name;
   ->
   ->      OPEN csr_mgr_id;
   ->      FETCH csr_mgr_id INTO l_manager_id;
   ->
   ->      INSERT INTO employee (first_name,id,city)
   ->      VALUES(p_first_name,l_manager_id,p_city);
   ->
   ->      CLOSE csr_mgr_id;
   -> END$$

Query OK, 0 rows affected (0.00 sec) mysql> delimiter ; mysql> mysql> set @myCode = 0; Query OK, 0 rows affected (0.00 sec) mysql> set @myMessage = 0; Query OK, 0 rows affected (0.00 sec) mysql> mysql> call myProc("Jason","Martin","New City","New Description",@myCode,@myMessage); Query OK, 1 row affected (0.01 sec) mysql> drop procedure myProc; Query OK, 0 rows affected (0.00 sec) mysql> 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 | | 1 | Jason | NULL | NULL | NULL | NULL | New City | NULL | +------+------------+-----------+------------+------------+---------+-----------+-------------+ 9 rows in set (0.00 sec) mysql> mysql> mysql> drop table Employee; Query OK, 0 rows affected (0.00 sec) mysql> mysql>

       </source>
   
  


Leave a cursor fetch

   <source lang="sql">

mysql> mysql> 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 (0.03 sec) mysql> mysql> 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 (0.02 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 (0.01 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 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:REPEAT
   ->           FETCH dept_csr INTO l_id,l_first_name,l_city;
   ->              IF no_more_departments THEN
   ->                LEAVE dept_loop;
   ->              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> 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 (0.34 sec) +------+--------------+-----------+ | l_id | l_first_name | l_city | +------+--------------+-----------+ | 3 | James | Vancouver | +------+--------------+-----------+ 1 row in set (0.34 sec) +------+--------------+-----------+ | l_id | l_first_name | l_city | +------+--------------+-----------+ | 4 | Celia | Vancouver | +------+--------------+-----------+ 1 row in set (0.36 sec) +------+--------------+-----------+ | l_id | l_first_name | l_city | +------+--------------+-----------+ | 5 | Robert | Vancouver | +------+--------------+-----------+ 1 row in set (0.36 sec) +------+--------------+----------+ | l_id | l_first_name | l_city | +------+--------------+----------+ | 6 | Linda | New York | +------+--------------+----------+ 1 row in set (0.36 sec) +------+--------------+----------+ | l_id | l_first_name | l_city | +------+--------------+----------+ | 7 | David | New York | +------+--------------+----------+ 1 row in set (0.36 sec) +------+--------------+-----------+ | l_id | l_first_name | l_city | +------+--------------+-----------+ | 8 | James | Vancouver | +------+--------------+-----------+ 1 row in set (0.36 sec) Query OK, 0 rows affected (0.36 sec) mysql> drop procedure myProc; Query OK, 0 rows affected (0.00 sec) mysql> mysql> mysql> mysql> mysql> drop table Employee; Query OK, 0 rows affected (0.00 sec) mysql> mysql>

       </source>
   
  


Output data in a cursor

   <source lang="sql">

mysql> mysql> 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 (0.05 sec) mysql> mysql> 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 (0.02 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> mysql> mysql> mysql> delimiter $$ mysql> CREATE PROCEDURE myProc()

   ->     READS SQL DATA
   -> BEGIN
   ->      DECLARE l_last_row INT DEFAULT 0;
   ->      DECLARE l_dept_id  INT;
   ->      DECLARE c_dept CURSOR FOR
   ->           SELECT id
   ->             FROM employee;
   ->      /* handler to set l_last_row=1 if a cursor returns no more rows */
   ->      DECLARE continue handler for NOT FOUND SET l_last_row=1;
   ->
   ->      OPEN c_dept;
   ->      dept_cursor: LOOP
   ->           FETCH c_dept INTO l_dept_id;
   ->           IF (l_last_row=1) THEN
   ->                LEAVE dept_cursor;
   ->           END IF;
   ->           select l_dept_id;
   ->
   ->      END LOOP dept_cursor;
   ->      CLOSE c_dept;
   ->
   -> END$$

Query OK, 0 rows affected (0.01 sec) mysql> mysql> delimiter ; mysql> call myProc(); +-----------+ | l_dept_id | +-----------+ | 1 | +-----------+ 1 row in set (0.00 sec) +-----------+ | l_dept_id | +-----------+ | 2 | +-----------+ 1 row in set (0.16 sec) +-----------+ | l_dept_id | +-----------+ | 3 | +-----------+ 1 row in set (0.16 sec) +-----------+ | l_dept_id | +-----------+ | 4 | +-----------+ 1 row in set (0.16 sec) +-----------+ | l_dept_id | +-----------+ | 5 | +-----------+ 1 row in set (0.17 sec) +-----------+ | l_dept_id | +-----------+ | 6 | +-----------+ 1 row in set (0.17 sec) +-----------+ | l_dept_id | +-----------+ | 7 | +-----------+ 1 row in set (0.17 sec) +-----------+ | l_dept_id | +-----------+ | 8 | +-----------+ 1 row in set (0.17 sec) Query OK, 0 rows affected (0.17 sec) 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> mysql>

       </source>
   
  


Using loop and Fetch to read the data in a cursor

   <source lang="sql">

mysql> 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 (0.01 sec) mysql> mysql> 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 (0.01 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 (0.02 sec) mysql> mysql> mysql> mysql> delimiter $$ mysql> CREATE PROCEDURE myProc()

   -> BEGIN
   ->   DECLARE l_sale_id INT;
   ->   DECLARE l_last_sale INT DEFAULT 0;
   ->
   ->   DECLARE sale_csr CURSOR FOR
   ->     SELECT id
   ->       FROM employee;
   ->
   ->   DECLARE CONTINUE HANDLER FOR NOT FOUND SET l_last_sale=1;
   ->
   ->   OPEN sale_csr;
   ->   sale_loop:LOOP
   ->     FETCH sale_csr INTO l_sale_id;
   ->     IF l_last_sale THEN
   ->       LEAVE sale_loop;
   ->     END IF;
   ->     select l_sale_id;
   ->   END LOOP sale_loop;
   ->   CLOSE sale_csr;
   ->
   -> END$$

Query OK, 0 rows affected (0.00 sec) mysql> mysql> delimiter ; mysql> call myProc(); +-----------+ | l_sale_id | +-----------+ | 1 | +-----------+ 1 row in set (0.00 sec) +-----------+ | l_sale_id | +-----------+ | 2 | +-----------+ 1 row in set (0.13 sec) +-----------+ | l_sale_id | +-----------+ | 3 | +-----------+ 1 row in set (0.13 sec) +-----------+ | l_sale_id | +-----------+ | 4 | +-----------+ 1 row in set (0.13 sec) +-----------+ | l_sale_id | +-----------+ | 5 | +-----------+ 1 row in set (0.13 sec) +-----------+ | l_sale_id | +-----------+ | 6 | +-----------+ 1 row in set (0.13 sec) +-----------+ | l_sale_id | +-----------+ | 7 | +-----------+ 1 row in set (0.13 sec) +-----------+ | l_sale_id | +-----------+ | 8 | +-----------+ 1 row in set (0.13 sec) Query OK, 0 rows affected (0.13 sec) mysql> drop procedure myProc; Query OK, 0 rows affected (0.00 sec) mysql> mysql> mysql> mysql> mysql> drop table Employee; Query OK, 0 rows affected (0.00 sec) mysql>

       </source>
   
  


Using while loop to loop through a cursor

   <source lang="sql">

mysql> 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",    "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 (0.02 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", "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> 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>

       </source>