1. MySQL
•View
•Store Procedure & Function
•Trigger

2. View
•View is set of saved SELECT queries. Queries can be executed in
view.
•Structure:
CREATE VIEW view_name AS
SELECT statement

3. Select statement
you can query any tables or views existed in the db.
Subquery cannot be included
Any variables cannot be used
Temporary tables or views cannot be used; any tables or views
which referred by views must exists.
View cannot be associated with triggers

4. Example
CREATE VIEW NhanSu AS
SELECT a.name, age, c.name as TenTinh
FROM people as a
join huyen as b ON a.huyen_id = b.id
join tinh as c ON b.id_tinh = c.id;

5. Advantage and Disadvantage
•Advantage
Sercurity
Simply
•Disadvantage:
Server resources (memory, process)

6. Function & Store Procedure
•A programming scripts with embedded SQL which has been
complied and can be executed by MySQL server.
•With SP, application logic can be stored in database.

7. How to create
CREATE FUNCTION name ([parameterlist]) RETURNS
datatype [options] sqlcode
CREATE PROCEDURE name ([parameterlist]) [options]
sqlcode
•Drop function/ proceduce
DROP FUNCTION [IF EXISTS] name
DROP PROCEDURE [IF EXISTS] name

8. Advantage
Decrease scripts
Maintenance
Better database security

9. Disadvantage
•Lack of Portability
•DB Server overload

10. DELIMITER $$
CREATE PROCEDURE film_in_stock(IN p_film_id INT, IN
p_store_id INT, OUT p_film_count INT)
READS SQL DATA
BEGIN
SELECT inventory_id
FROM inventory
WHERE film_id = p_film_id
AND store_id = p_store_id
AND inventory_in_stock(inventory_id);
SELECT FOUND_ROWS() INTO p_film_count;
END $$
DELIMITER ;

11. •DELIMITER $$:
•Assign value:
Use SET or SELECT INTO.
•Call proceduce:
Call film_in_stock(1,1, @film_count);
Select @film_count;

12. Trigger
•What is trigger?
•These applications my include : save changes or updates other
data tables.
•Trigger run after updating table

13. •CREATE TRIGGER name BEFORE | AFTER INSERT
|UPDATE | DELETE ON tablename
FOR EACH ROW sql-code
•DROP TRIGGER tablename.triggername
•ALTER TRIGGER, SHOW CREATE TRIGGER, hoặc SHOW TRIGGER
STATUS
•Để hiển thị các trigger gắn với 1 bảng dữ liệu
SELECT * FROM Information_Schema.Trigger
WHERE Trigger_schema = 'database_name' AND
Event_object_table = 'table_name';
How to create

14. DELIMITER ;;
CREATE TRIGGER `upd_film` AFTER UPDATE ON `film` FOR
EACH ROW BEGIN
IF (old.title != new.title) or (old.description != new.description)
THEN
UPDATE film_text
SET title=new.title,
description=new.description,
film_id=new.film_id
WHERE film_id=old.film_id;
END IF;
END;;
DELIMITER ;

15. •Inside structure same as SP
•In trigger, scripts can access columbs of current record.
OLD.columnname (UPDATE, DELETE)
NEW.columnname (INSERT, UPDATE)