How to CRUD using PDO Connection? - php

Question

I want to CRUD using PDO Connection
I know how to create insert update and delete using msql_query() but I have no idea how to do that with PDO Connection.

Answer 1

Below is the example of that
class connection{
public $cnn;
public function __construct(){
$host = 'localhost';
$db_name = "db_name";
$username = "db_username";
$password = "db_password";
try {
$this->cnn = new PDO("mysql:host={$host};dbname={$db_name}", $username, $password);
} catch (PDOException $e) {
echo 'Connection failed: ' . $e->getMessage();
}
}
public function select($query){ //this function is created for get data
$result = $this->cnn->query($query);
return $result->fetchAll(PDO::FETCH_ASSOC);
}
public function insert($query){ //this function is created for insert data. it will be return last inserted id.
$this->cnn->exec($query);
return $this->cnn->lastInsertId();
}
public function update($query){ //this function is created for update data and it will be return effected rows (which are updated)
return $this->cnn->exec($query);
}
public function delete($query){ // this function is use to delete data.
return $this->cnn->exec($query);
}
}
$action = new connection;
$result = $action->select("select * from table_name");
print_r($result);
$result = $action->insert("insert into table_name set column_1 = 'first_value', column_2='second_value'");
$result = $action->update("update table_name set column_1 = 'first_value', column_2='second_value' where id=1");
$result = $action->delete("delete from table_name where id=1");

Answer 2

Maybe this is an easier way to do it. now the only thing you have to do is call the functions. Enjoy (:
<?php
$host = "localhost";
$user = "root";
$password = "";
$database = "database";
$pdo = new PDO("mysql:host=$host;dbname=$database", $user, $password);
$pdo->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
function updateuser($pdo, $username, $password, $id){
$sql = "UPDATE users SET username=?, password=? WHERE id=?";
$stmt= $pdo->prepare($sql);
$stmt->execute([$username, $password, $id]);
}
function deleteuser($pdo, $id){
$sql = 'DELETE FROM users WHERE id = ?';
$statement = $pdo->prepare($sql);
$statement->execute([$id]);
}
function createuser($pdo, $username, $password){
$sql = "INSERT INTO users (username, password) VALUES (?,?)";
$stmt= $pdo->prepare($sql);
$stmt->execute([$username, $password]);
}
function readuser($pdo, $id){
$sql = "SELECT id, username FROM users WHERE id=?";
$statement = $pdo->prepare($sql);
$statement->execute([$id]);
return $statement->fetchAll(PDO::FETCH_ASSOC);
}