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Visual CRUD in PHP

In this video tutorial I have shown how to make a basic crud application in php. I have connected with database using php PDO(php data object). Which is database agnostic. You can connect any sql database with this procedure.

Objective of this video

  • You will be able to create, read, update, delete in php
  • You will understand php data object(PDO). PDO is database agnostic. You can connect any sql database with php. PDO is most recommended way to connect with database.
  • You will understand basic php workflow.

blah blah blah....

Don't be scare about the basic command line. Lot of people scare about command line. Actually command line help us to get rid of laborious work a lot. in this video I have used cd for changing directory. mkdir for making directory. touch for making file. Here touch was very handy. I make 5 file in single line command. touch index.php create.php edit.php delete.php db.php. If you are windows user use git bash to perform those command.

tuts

Mysql part

first login to mysql and create database and table. to create database and table following code will be necessary. sql is not case sensitive. We can use sql syntax uppercase and lower case vice versa.

CREATE DATABASE company;
USE company;
CREATE TABLE people (
  id  INT(11) AUTO_INCREMENT PRIMARY KEY,
  name VARCHAR(30) NOT NULL,
  email VARCHAR(30) NOT NULL
);

Database connection

In db.php connect with database by instantiating PDO.

$dsn = 'mysql:host=localhost;dbname=company';
$username = 'root';
$password = '';
$options = [];
$connection = new PDO($dsn, $username, $password, $options);

here dsn means data source name. which contain sql driver, database name and host information.

create

we made connection in db.php file. Whenever we need connection we have to require 'db.php' page. In create page, our form action is empty so, it will submit form data to same page. Hence, we use php isset function whether form submitted or not. If $_POST['name_field'] is set in we will get value from form and insert data into database

  $name = $_POST['name'];
  $email = $_POST['email'];
  $sql = 'INSERT INTO people(name, email) VALUES(:name, :email)';
  $statement = $connection->prepare($sql);
  $statement->execute([':name' => $name, ':email' => $email]);

Here we use placeholder in sql statement. We can use $connection->query() function directly. Therefore, Here we use prepare() statement. Which actually less error prone and secure.

read

$sql = 'SELECT * FROM people';
$statement = $connection->prepare($sql);
$statement->execute();
$people = $statement->fetchAll(PDO::FETCH_OBJ);

Here we are fetching data from database using fetchAll function which take PDO::FETCH_OBJ constant. If we don't pass any constant fetchAll function return index and associative array. Therefore, I like to access table column in object oriented way. Hence I passed that constant.

update

In home page (index.php) we linked edit page in action column. which actually send data to edit page using get method. We give url param id and it value's is table id.
In edit.php file we can access id param using $_GET super global. Once we have id we can fetch person information from database using following code.

$id = $_GET['id'];
$sql = 'SELECT * FROM people WHERE id=:id';
$statement = $connection->prepare($sql);
$statement->execute([':id' => $id ]);
$person = $statement->fetch(PDO::FETCH_OBJ);

In case of edit, existing input field value will be $person name and email. when edit form will submit we update our database record by filtering id.

$name = $_POST['name'];
$email = $_POST['email'];
$sql = 'UPDATE people SET name=:name, email=:email WHERE id=:id';
$statement = $connection->prepare($sql);
$statement->execute([':name' => $name, ':email' => $email, ':id' => $id]);

delete

deleting logic also as like edit. we will accessing id using $_GET super global and we will delete database record by filtering id.

$id = $_GET['id'];
$sql = 'DELETE FROM people WHERE id=:id';
$statement = $connection->prepare($sql);
$statement->execute([':id' => $id])

redirection

For edit and delete success we redirect to home page using header function.

header('Location: /');

Thank You. Take care.