Php 2

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

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.

Relational Database use tables to store
information

Tables store data in a grid-like pattern of
columns and rows.

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

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

CREATE DATABASE
CREATE DATABASE elvis_store

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

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.

INSERT

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

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

SELECT

SELECT *
FROM student

SELECT first_name, last_name
FROM student

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

UPDATE

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

DELETE

DELETE FROM student
WHERE last_name = "Dung"

ORDER BY

SELECT * FROM student
ORDER BY last_name ASC

SELECT * FROM student
ORDER BY last_name DESC

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

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")

Create an SQL query and store it as a string in a PHP variable.

Create an SQL query and store it as a string in a PHP variable.

$query = "SELECT * FROM student";

Issue the query with the mysqli_query() function.

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 />";
}

Close the database connection with the mysqli_close() function.

Close the database connection with the mysqli_close() function.

mysqli_close($con);

Php 2

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