A database is an organized collection of data stored and managed using database management systems. Relational databases store data in tables with rows and columns and use SQL for queries. MySQL is a popular open-source relational database that uses SQL. PHP functions like mysqli_connect(), mysqli_query(), and mysqli_close() allow connecting to and querying MySQL databases from PHP scripts.

1. PHP 2

2. What is Database?

3. A database is an organized collection of data for
one or more purposes.

4. Where’s database data actually stored? Can I
see the files?
Database data is typically stored in files on a
hard disk although you could certainly look at
them.

5. Original Database

6. Relational Database use tables to store
information
Tables store data in a grid-like pattern of
columns and rows.

8. MySQL

9. SQL is the query language used to communicate
with a MySQL database.

10. Tool to manage MySQL

11. SQL can be divided into two parts
Data Manipulation Language (DML)
SELECT
UPDATE
DELETE
INSERT INTO
Data Definition Language (DDL)
CREATE DATABASE
ALTER DATABASE
CREATE TABLE
ALTER TABLE
DROP TABLE
CREATE INDEX
DROP INDEX

12. CREATE DATABASE
CREATE DATABASE elvis_store

14. CREATE TABLE INSIDE THE DATABASE
CREATE TABLE email_list(
first_name varchar(30),
last_name varchar(30),
email varchar(50)
)

15. We need to define our data
When you create a table, you have to tell the MySQL server what
type of data each column will hold.
To create a table, you need to know what type of data is stored in
each table column.

17. INSERT
INSERT INTO student
VALUES (“Trung”,”Dung”,”tdung@gmail.com”)
INSERT INTO student (first_name,last_name,email)
VALUES (“Trung”,”Dung”,”tdung@gmail.com”)

18. SELECT
SELECT *
FROM student
SELECT first_name, last_name
FROM student

19. WHERE Clause
SELECT *
FROM student
WHERE first_name = “Dung”

20. UPDATE
UPDATE student
SET first_name = "Long"
WHERE last_name = "Dung"

21. DELETE
DELETE FROM student
WHERE last_name = "Dung"

22. ORDER BY
SELECT * FROM student
ORDER BY last_name ASC
SELECT * FROM student
ORDER BY last_name DESC

23. Use PHP functions to talk to the database
Connect to a database with the mysqli_connect() function.

24. Use PHP functions to talk to the database
Connect to a database with the mysqli_connect() function.
The location of the database
(a domain name, an IPaddress or localhost)
The name of your database
Your username and password
$con = mysqli_connect("localhost","root","","php")

25. Use PHP functions to talk to the database
Create an SQL query and store it as a string in a PHP variable.

26. Use PHP functions to talk to the database
Create an SQL query and store it as a string in a PHP variable.
$query = "SELECT * FROM student";

27. Use PHP functions to talk to the database
Issue the query with the mysqli_query() function.

28. Use PHP functions to talk to the database
Issue the query with the mysqli_query() function.
$result = mysqli_query($con, $query);
while($row = mysqli_fetch_array($result))
{
echo $row['first_name'] . " " . $row['last_name'];
echo "<br />";
}

30. Use PHP functions to talk to the database
Close the database connection with the mysqli_close() function.

31. Use PHP functions to talk to the database
Close the database connection with the mysqli_close() function.
mysqli_close($con);