Lecture Web technologies and programming – Lecture 27: Retrieving data, delete, update from database - TRƯỜNG CÁN BỘ QUẢN LÝ GIÁO DỤC THÀNH PHỐ HỒ CHÍ MINH

• Retrieving data from MySQL using PHP • CONNECTIONS: login functionality. • Deleting records in MySQL using PHP[r]

2

• Creating database in MySQL using WAMP

database

web application with file upload

4

• Retrieving data from MySQL using PHP

• CONNECTIONS: login functionality

• Connection with database

• Make display structure

• Write data

6

mysql_connect( “localhost” , ”root” , ”” ) or die( “Error in connection” );

die( “Error in Selection” );

?>

select data from one or more tables:

• SELECT command in SQL:

FROM table-name

SELECT user_Name

FROM users

SELECT *

FROM users

• Condition selection:

FROM table-name

SELECT *

<?php

include(‘connection.php’);

$sql = ‘ select * from users ’;

$result = mysql_query($sql);

?>

• Counting rows:

– mysql_num_rows(variable);

<?php

include(‘connection.php’);

$sql = ‘ select * from users ’;

$result = mysql_query($sql);

$users = mysql_num_rows($result);

<table border=‘1’>

<tr>

<th> User Name</th>

<th> User Email</th>

<th> User Password</th>

<th> User Picture</th>

</tr>

<tr>

<td> &nbsp;</td>

<td> &nbsp;</td>

<td> &nbsp;</td>

<td> &nbsp;</td>

</tr>

</table>

• mysql_fetch_array(result-resource);

– mysql_fetch_array( $result );

$result=

$row = mysql_fetch_array($result);

1 Ali ali@yahoo.com 123 upload/123ali.jpg

2 Umar umar@yahoo.com 123 upload/123umar.jpg

$row= 1 Ali ali@yahoo.com 123 upload/123ali.jpg

user_I d

user_Nam e

user_Emai l

user_Passwo rd

user_Pictur e

echo $row

[ 1 ];

echo

$row[ ‘user_Name’ ];

<table border=‘1’>

<tr>

<th> User Name</th>

<th> User Email</th>

<th> User Password</th>

<th> User Picture</th>

</tr>

<tr>

<td> <?php echo $row[1]; ?> </td>

<td> <?php echo $row[2]; ?> </td>

<td> <?php echo $row[3]; ?> </td>

<td> <img src= “<?php echo $row[4]; ?

User Name

User Email User

Password

User Picture Ali ali@yahoo.co

<table border=‘1’>

Heading Row

<?php

while($rows =

mysql_fetch_array($result))

{

?>

<tr>

<td> <?php echo $row[1]; ?> </td>

<td> <?php echo $row[2]; ?> </td>

<td> <?php echo $row[3]; ?> </td>

<td> <img src= “<?php echo $row[3]; ?

>”> </td>

</tr>

<?php } ?>

</table>

Name Password Picture Ali ali@yahoo.co

Umar umar@yahoo.

com

123

Starts a HTML page

Connection to database

Select command Query executed

Headin

g row

Loop starts Keeps row

Displays name

Displays email Displays

password

Displays

image Sets source

Ends loop

Records in user’s table

Output from the table