Error in php Connection Error: could not find driver - php

Question

I got an error when I want to consume a Rest API using postaman and docker.
The error is marked in this line of code: Error in php Connection Error: could not find driver
<?php
class Materias {
// DB stuff
private $conn;
private $table = 'materias';
// Materias Properties
public $clave_materia;
public $nombre_materia;
public $semestre;
public $creditos;
// Constructor with DB
public function __construct($db) {
$this->conn = $db;
}
// Get Materias
public function read() {
// Create query
$query = 'SELECT * FROM ' . $this->table;
// Prepare statement
$stmt = $this->conn->prepare($query);
// Execute query
$stmt->execute();
return $stmt;
}
// Get Single Materia
public function read_single() {
// Create query
$query = 'SELECT * FROM ' . $this->table . 'WHERE clave_materia = ?';
// Prepare statement
$stmt = $this->conn->prepare($query);
// Bind clave_materia
$stmt->bindParam(1, $this->clave_materia);
// Execute query
$stmt->execute();
$row = $stmt->fetch(PDO::FETCH_ASSOC);
// Set properties
$this->nombre_materia = $row['nombre_materia'];
$this->semestre = $row['semestre'];
$this->creditos = $row['creditos'];
}
// Create Post
public function create() {
// Create query
$query = 'INSERT INTO ' . $this->table . ' SET clave_materia = :clave_materia, nombre_materia = :nombre_materia, semestre = :semestre, creditos = :creditos';
// Prepare statement
$stmt = $this->conn->prepare($query);
// Clean data
$this->clave_materia = htmlspecialchars(strip_tags($this->clave_materia));
$this->nombre_materia = htmlspecialchars(strip_tags($this->nombre_materia));
$this->semestre = htmlspecialchars(strip_tags($this->semestre));
$this->creditos = htmlspecialchars(strip_tags($this->creditos));
// Bind data
$stmt->bindParam(':clave_materia', $this->clave_materia);
$stmt->bindParam(':nombre_materia', $this->nombre_materia);
$stmt->bindParam(':semestre', $this->semestre);
$stmt->bindParam(':creditos', $this->creditos);
// Execute query
if($stmt->execute()) {
return true;
}
// Print error if something goes wrong
printf("Error: %s.\n", $stmt->error);
return false;
}
// Update Post
public function update() {
// Create query
$query = 'UPDATE ' . $this->table . '
SET nombre_materia = :nombre_materia, semestre = :semestre, creditos = :creditos
WHERE clave_materia = :clave_materia';
// Prepare statement
$stmt = $this->conn->prepare($query);
// Clean data
$this->nombre_materia = htmlspecialchars(strip_tags($this->nombre_materia));
$this->semestre = htmlspecialchars(strip_tags($this->semestre));
$this->creditos = htmlspecialchars(strip_tags($this->creditos));
$this->clave_materia = htmlspecialchars(strip_tags($this->clave_materia));
// Bind data
$stmt->bindValue(':nombre_materia', $this->nombre_materia);
$stmt->bindValue(':semestre', $this->semestre);
$stmt->bindValue(':creditos', $this->creditos);
$stmt->bindValue(':clave_materia', $this->clave_materia);
// Execute query
if($stmt->execute()) {
return true;
}
// Print error if something goes wrong
printf("Error: %s.\n", $stmt->error);
return false;
}
// Delete Post
public function delete() {
// Create query
$query = 'DELETE FROM ' . $this->table . ' WHERE clave_materia = :clave_materia';
// Prepare statement
$stmt = $this->conn->prepare($query);
// Clean data
$this->clave_materia = htmlspecialchars(strip_tags($this->clave_materia));
// Bind data
$stmt->bindParam(':clave_materia', $this->clave_materia);
// Execute query
if($stmt->execute()) {
return true;
}
// Print error if something goes wrong
printf("Error: %s.\n", $stmt->error);
return false;
}
}
Error:
Connection Error: could not find driver<br />
<b>Fatal error</b>: Uncaught Error: Call to a member function prepare() on null in /var/www/html/models/Materias.php: 24
Stack trace:
#0 /var/www/html/api/materias/read.php(17): Materias->read()
#1 {main
}
thrown in <b>/var/www/html/models/Materias.php</b> on line <b>24</b><br />
**bd connection**
<?php
class Database {
// DB Params
private $host = 'localhost';
private $db_name = 'reticula';
private $username = 'root';
private $password = 'test ';
private $conn;
// DB Connect
public function connect() {
$this->conn = null;
try {
$this->conn = new PDO('mysql:host=' . $this->host . ';dbname=' . $this->db_name, $this->username, $this->password);
$this->conn->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
} catch(PDOException $e) {
echo 'Connection Error: ' . $e->getMessage();
}
return $this->conn;
}
}
This is where you call matters
<?php
// Headers
header('Access-Control-Allow-Origin: *');
header('Content-Type: application/json');
include_once '../../config/Database.php';
include_once '../../models/Materias.php';
// Instantiate DB & connect
$database = new Database();
$db = $database->connect();
// Instantiate blog post object
$materias = new Materias($db);
// Blog post query
$result = $materias->read();
// Get row count
$num = $result->rowCount();
// Check if any posts
if($num > 0) {
// Post array
$materias_arr = array();
// $posts_arr['data'] = array();
while($row = $result->fetch(PDO::FETCH_ASSOC)) {
extract($row);
$materias_item = array(
'clave_materia' => $clave_materia,
'nombre_materia' => $nombre_materia,
'semestre' => $semestre,
'creditos' => $creditos
);
// Push to "data"
array_push($materias_arr, $materias_item);
// array_push($posts_arr['data'], $post_item);
}
// Turn to JSON & output
echo json_encode($materias_arr);
} else {
// No Posts
echo json_encode(
array('message' => 'No Posts Found')
);
}