This document provides an introduction and instructions for connecting a PHP application to a MySQL database. It discusses storing and retrieving data from the database. The key steps covered are: 1. Connecting to the MySQL server from PHP using mysql_connect(). 2. Selecting the database to use with mysql_select_db(). 3. Executing SQL queries to store/retrieve data with mysql_query(). 4. Different mysql_fetch_* functions that can be used to retrieve rows of data from a database query. An example task is provided where a registration form allows storing user data to a database table, and then retrieving and displaying the stored data in a table.

1. WELCOME

2. INTRODUCTION TO
PHP-MySQL CONNECTIVITY

3. 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.

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

5. INTRODUCTION TO PHP DATABASE
CONNECTIVITY

6. Introduction To PHP Database
Connectivity
We had already tried passing data to a server .
But..where do we store this data and how…?

7. How To Connect PHP to Database?
Step 1 : Connecting to MySQL Server
Step 2 : Selecting Database
Step 3 : Query Execution

8. STEP 1 -
CONNECTING TO MySQL SERVER
mysql_connect(‘host_name’,’username’,’password’);
Eg: mysql_connect(‘localhost’,’root’,’root’);

9. STEP 2-
SELECTING DATABASE
mysql_select_db(‘Database Name’);
Eg: mysql_select_db(‘baabtra_db’);

10. 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’ ”);

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

12. TASK
Step1: Create the Registration form

13. STEP 1
Registration.html

14. Step2
Step 2: Now create a database to store the data passed from registration form

15. Step 2
Lets create the database
create database company_baabtra;
Create a table tbl_baabtra_mentees as shown here

16. Step 3
Step 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

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

18. Step 4
register_action.php
Connects to remote server

19. Step 4
register_action.php
Selects the database

20. Step 4
register_action.php Executes the mysql query to
store the registered mentee
information into database

21. Step 5
Step 5: Run your registration form from the localhost now

22. Step 5

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

24. Connecting Database to PHP
Now how do we fetch the data stored in database from frontend ??

25. 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

26. 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 row
echo $fetch[1]; //prints second column the retrieved row
}

27. 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 row
echo $fetch[‘vchr_phone’]; //prints second column the retrieved row
}

28. 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 row
echo $fetch[‘vchr_phone’]; //prints second column the retrieved row
}

29. 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 row
echo $fetch -> ‘vchr_phone’; //prints second column the retrieved row
}

30. 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 row
echo $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.”

31. Okay…!!
So what are we waiting for now..??
Lets do it then

32. 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’);

33. Let’s Get Back With Our Task
Step 8: Now fetch the data from tbl_baabtra_mentees and display it in a
table format.

34. Step 8
uses mysql_fetch_row function.
returns each row of data from the
mysql table

35. Step 8
fetches using the column
number

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

37. Step 9
On Submit it displays the list of mentees registered

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

39. END OF THE SESSION