Php database connectivity

WELCOME

INTRODUCTION TO PHP-MySQL CONNECTIVITY

What you Benefit ???

By the end of this session you will learn how to use PHP to

● Store the data into database.

● Retrieve data from the backend database in real-time.

TASK OF THE DAYCreate the registration form shown here and store the data passed with it into a database .

INTRODUCTION TO PHP DATABASE CONNECTIVITY

Introduction To PHP Database Connectivity

We had already tried passing data to a server . But..where do we store this data and how…?

How To Connect PHP to Database?

Step 1 : Connecting to MySQL ServerStep 2 : Selecting DatabaseStep 3 : Query Execution

STEP 1 - CONNECTING TO MySQL SERVER

mysql_connect(‘host_name’,’username’,’password’);

Eg: mysql_connect(‘localhost’,’root’,’root’);

STEP 2-SELECTING DATABASE

mysql_select_db(‘Database Name’);

Eg: mysql_select_db(‘baabtra_db’);

STEP 3-QUERY EXECUTION

mysql_query(“query to be executed”);

Eg: mysql_query(“update table baabtra_mentees_tbl set vchr_cmpny_name=’Baabtra’ where pk_int_branch_id=’Caffit’ ”);

Let’s TRY

Why don’t we make it even more interesting by implementing this with our task. So let’s start

TASK

Step1: Create the Registration form

STEP 1Registration.html

Step2

Step 2: Now create a database to store the data passed from registration form

Step 2

Lets create the database create database company_baabtra;

Create a table tbl_baabtra_mentees as shown here

Step 3Step 3: Retrieve the data passed using POST method from register_action.php

Checks if button click is set

File upload

Reading the checked values from

checkbox

Step 4

Step 4: Data is now available at register_action.php. So next step is to store this data into the database.

Step 4

register_action.php

Connects to remote server

Step 4

register_action.phpSelects the database

Step 4

register_action.php Executes the mysql query to store the registered mentee information into database

Step 5

Step 5: Run your registration form from the localhost now

Step 5

Step 6

Step 6: Check your database. It should be updated somewhat like that

Connecting Database to PHP

Now how do we fetch the data stored in database from frontend ??

Retrieving Data From MySQL

There are four different ways to fetch the data from database using PHP.

▪ Mysql_fetch_array()▪ Mysql_fetch_row()▪ Mysql_fetch_assoc()▪ Mysql_fetch_object()

All of the above will return one row from table at a time and then the next row

and so on . So usually we use these functions along with a while loop

mysql_fetch_row()

$query = mysql_query (“select * from tbl_baabtra_mentees");while($fetch=mysql_fetch_row($query)){

echo $fetch[0]; //prints first column the retrieved rowecho $fetch[1]; //prints second column the retrieved row

}

mysql_fetch_assoc()

$query = mysql_query (“select * from tbl_baabtra_mentees");while($fetch=mysql_fetch_assoc($query)){

echo $fetch[‘vchr_uname’]; //prints first column the retrieved rowecho $fetch[‘vchr_phone’]; //prints second column the retrieved row

}

mysql_fetch_array()

$query = mysql_query (“select * from tbl_baabtra_mentees");while($fetch=mysql_fetch_array($query)){

echo $fetch[0]; //prints first column the retrieved rowecho $fetch[‘vchr_phone’]; //prints second column the retrieved row

}

mysql_fetch_object()

$query = mysql_query (“select * from tbl_baabtra_mentees");while($fetch=mysql_fetch_object($query)){

echo $fetch -> ‘vchr_uname’; //prints first column the retrieved rowecho $fetch -> ‘vchr_phone’; //prints second column the retrieved row

}

mysql_fetch_object()

$query = mysql_query (“select * from tbl_baabtra_mentees");while($fetch=mysql_fetch_object($query)){

echo $fetch -> ‘vchr_uname’; //prints first column the retrieved rowecho $fetch -> ‘vchr_phone’; //prints second column the retrieved row

}

“Returns an object with properties that correspond to the fetched row and moves the internal data pointer ahead.”

Okay…!! So what are we waiting for now..??

Lets do it then

Let’s Get Back With Our Task

Step 7: Set a header to redirect from ‘register_action.php’ to ‘view_baabtra_mentees.php’

header(‘Location: view_baabtra_mentees.php’);

Let’s Get Back With Our Task

Step 8: Now fetch the data from tbl_baabtra_mentees and display it in a table format.

Step 8

uses mysql_fetch_row function. returns each row of data from the mysql table

Step 8

fetches using the column number

Step 9Step 9: Run the registration form from localhost now

Step 9

On Submit it displays the list of mentees registered

Woooh….!!! That really works…So we are done with our TASK of the day.

That was great…!!!

END OF THE SESSION