PHP - somo la 62: Project ya CRUDE operation kwa kutumia PHP - OOP na MySQL database

PROJECT YA CRUDE OPERATION KWA KUTUMIA OOP

Katika project hii utakwenda kujifunza jinsi ya kufanya CRUDE operation kwa kutumia PHP OOP na MySQL database. 

CRUDE ki kifupisho cha maneno CREATE, READ, UPDATE, DELETE. haya ni matendo muhimu manne kwenye database. Ili uweze kutumia database ni azima uyajuwe matendo haya. Code za project hii pia unawez akuzi download kwenye maktaba yetu hapa

Create hii inahusika na kuingiza taarifa kwenye database. Ni sawa na kutumia neno INSERT kama linavyotumika kwenye sql.

Read hii inahusika na kusoma data wenye database

Update hii inahusika na ku edit taarifa, yaani kuziboresha ama kuzibadili. Ni sawa na kutumia neno UPDATE kwenye sql.

Delete hii inahusika na kufuta taarifa kwenye data kwenye database. Ni sawa na kutumia DELETE kwenye sql.

Sasa katika project hii nimekuandalia matokeo ya wanafunzi waliofanya mtihani. Sasa tunakwenda kutumia OOP ili kuweza ku access database ili tuweze kufanya matendo hayo matatu yalotaja.

Database yetu nimeiita matokeo na table yenye wanafunzi nimeiita majibu. Table ina column tatu ambazo ni id, jina, alama. Id ni primary key na ni auto increment column. Project yetu ina mafaili 6 ambayo ni:-

1. read.php
2. edit.php 
3. delete.php
4. add.php
5. Wanafuzi_class.php
6. style.css

Database:

Unaweza kutengeneza database kwa maelezo niliokupa hapo awali amba pia unaweza ku run code hizo hapo chini za sql ili kutengeneza table na kuweka baadhi ya data. Hakikisha uwe umeshatengeneza database yenye jina matokeo:

CREATE TABLE `majibu` (

  `id` int(11) NOT NULL,

  `jina` varchar(255) NOT NULL,

  `alama` int(11) NOT NULL

) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_general_ci;

INSERT INTO `majibu` (`id`, `jina`, `alama`) VALUES

(1, 'Jumanya', 50),

(2, 'Halima', 32),

(3, 'Daudi', 26),

(4, 'Saidi', 28),

(6, 'kasimu', 32),

(7, 'John ', 40),

(19, 'kwaya', 26);

ALTER TABLE `majibu`

  ADD PRIMARY KEY (`id`);

ALTER TABLE `majibu`

  MODIFY `id` int(11) NOT NULL AUTO_INCREMENT;

wanafunzi_class.php

Tengeneza faili kisha liiite wanafunzi_class.php kisha pest code hizo hapo chini:-

<?php

class wanafunzi

{

   private $host = 'localhost';

   private $username = 'root';

   private $password = '';

   private $database = 'matokeo';

   public $db;

   public function __construct()

   {

       if (!isset($this->db)) {

           try {

               $this->db = new mysqli($this->host, $this->username, $this->password, $this->database);

           } catch (Exception $e) {

               $error = $e->getMessage();

               echo $error;

           }

       }

   }

   public function majina_ya_wanafunzi()

   {

       $select = "SELECT * FROM `majibu`";

       $result = mysqli_query($this->db, $select);

       return mysqli_fetch_all($result);

   }

   public function to_be_edited($pupil_id)

   {

       $pupil_id = mysqli_real_escape_string($this->db, $pupil_id);

       $select = "SELECT * FROM `majibu` where id = $pupil_id";

       $result = mysqli_query($this->db, $select);

       return mysqli_fetch_all($result);

   }

   public function insertData($jina, $matokeo)

   {

       $jina = mysqli_real_escape_string($this->db, $jina);

       $matokeo = mysqli_real_escape_string($this->db, $matokeo);

       $insert = "INSERT INTO `majibu` (`jina`, `alama`) VALUES ('$jina', '$matokeo')";

       $result = mysqli_query($this->db, $insert);

       return $result;

   }

   public function editData($id, $jina, $matokeo)

   {

       $id = mysqli_real_escape_string($this->db, $id);

       $jina = mysqli_real_escape_string($this->db, $jina);

       $matokeo = mysqli_real_escape_string($this->db, $matokeo);

       $update = "UPDATE `majibu` SET `jina`='$jina', `alama`='$matokeo' WHERE `id`='$id'";

       $result = mysqli_query($this->db, $update);

       return $result;

   }

   public function deleteData($id)

   {

       $id = mysqli_real_escape_string($this->db, $id);

       $delete = "delete from majibu WHERE `id`='$id'";

       $result = mysqli_query($this->db, $delete);

       return $result;

   }

}

$db = new wanafunzi();

read.php

Tengeneza faili lenye jina read.php kisha pest code hizo hapo chini

<?php

require_once 'wanafunzi_class.php';

?>

<!DOCTYPE html>

<html lang="en">

<head>

   <meta charset="UTF-8">

   <meta name="viewport" content="width=device-width, initial-scale=1.0">

   <link rel="stylesheet" href="style.css">

   <title>Majibu Data</title>

</head>

<body>

<?php

echo '<table border="1" class="center">';

echo '<a href="a...