Wednesday, 11 May 2016

Select or Fetch Data from Mysql Table using OOPS in PHP


In this post you can find how to use Object Oriented Programming concept of PHP to select or fetch data from Mysql database table. If you are beginner php programmer and you starting to learn PHP OOPs concept then this post is very useful. Here you can find how to create simple class, how to use php oops __construct() magic method, how to create simple function in class. Here you can learn select or fetch data from table using PHP OOPs. For this things I have create simple class with name databases and make database connection under __construct() magic method of PHP. This is because whenever new object is created of this class then at time which you have write under this method. For fetching data I have make one simple select function. You can called this function as many times. Because many advantage of OOPs is that reusable of code. You can use single function as many time. When you called this function then at that time you have to define only name of table from which you want to fetch data. This will reduce line of programming code. For more details, you can see the video of this post.

Source Code

database.php


 <?php   
 //database.php  
 class Databases{  
      public $con;  
      public function __construct()  
      {  
           $this->con = mysqli_connect("localhost", "root", "", "testing");  
           if(!$this->con)  
           {  
                echo 'Database Connection Error ' . mysqli_connect_error($this->con);  
           }  
      }  
      public function insert($table_name, $data)  
      {  
           $string = "INSERT INTO ".$table_name." (";            
           $string .= implode(",", array_keys($data)) . ') VALUES (';            
           $string .= "'" . implode("','", array_values($data)) . "')";  
           if(mysqli_query($this->con, $string))  
           {  
                return true;  
           }  
           else  
           {  
                echo mysqli_error($this->con);  
           }  
      }  
      public function select($table_name)  
      {  
           $array = array();  
           $query = "SELECT * FROM ".$table_name."";  
           $result = mysqli_query($this->con, $query);  
           while($row = mysqli_fetch_assoc($result))  
           {  
                $array[] = $row;  
           }  
           return $array;  
      }  
 }  
 ?>  

test_class.php


 <?php  
 //test_class.php  
 include 'database.php';  
 $data = new Databases;  
 $success_message = '';  
 if(isset($_POST["submit"]))  
 {  
      $insert_data = array(  
           'post_title'     =>     mysqli_real_escape_string($data->con, $_POST['post_title']),  
           'post_desc'          =>     mysqli_real_escape_string($data->con, $_POST['post_desc'])  
      );  
      if($data->insert('tbl_posts', $insert_data))  
      {  
           $success_message = 'Post Inserted';  
      }       
 }  
 ?>  
 <!DOCTYPE html>  
 <html>  
      <head>  
           <title>Webslesson Tutorial | Select or Fetch Data from Mysql Table using OOPS in PHP</title>  
           <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap.min.css" />  
           <script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/js/bootstrap.min.js"></script>  
           <script src="https://ajax.googleapis.com/ajax/libs/jquery/2.2.0/jquery.min.js"></script>  
      </head>  
      <body>  
           <br /><br />  
           <div class="container" style="width:700px;">  
                <form method="post">  
                     <label>Post Title</label>  
                     <input type="text" name="post_title" class="form-control" />  
                     <br />  
                     <label>Post Description</label>  
                     <textarea name="post_desc" class="form-control"></textarea>  
                     <br />  
                     <input type="submit" name="submit" class="btn btn-info" value="Submit" />  
                     <span class="text-success">  
                     <?php  
                     if(isset($success_message))  
                     {  
                          echo $success_message;  
                     }  
                     ?>  
                     </span>  
                </form>  
                <br />  
                <div class="table-responsive">  
                     <table class="table table-bordered">  
                          <tr>  
                               <td width="30%">Post Name</td>  
                               <td width="50">Post Description</td>  
                               <td width="10%">Edit</td>  
                               <td width="10%">Delete</td>  
                          </tr>  
                          <?php  
                          $post_data = $data->select('tbl_posts');  
                          foreach($post_data as $post)  
                          {  
                          ?>  
                          <tr>  
                               <td><?php echo $post["post_title"]; ?></td>  
                               <td><?php echo substr($post["post_desc"], 0, 200); ?></td>  
                               <td><a href="test_class.php?edit=1&post_id=<?php echo $post["post_id"]; ?>">Edit</a></td>  
                               <td><a href="#" id="<?php echo $post["post_id"]; ?>" class="delete">Delete</a></td>  
                          </tr>  
                          <?php  
                          }  
                          ?>  
                     </table>  
                </div>  
           </div>  
      </body>  
 </html>  

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