SQL/MySQL/Cursor/Fetch
Содержание
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>
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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>
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