Friday, 13 May 2016

Delete Data from Mysql Table using OOP in PHP


I am continues on PHP Object Oriented Programming concept, here we will learn How to use PHP Object Oriented Programming for delete data from Mysql Table with confirmation message. As earlier post I have make one class in which I have already describe how to connect to database in OOPs, how to insert data into table, how to fetch data from table and how to update data using PHP OOPs. But Here I have show you how to delete data from Mysql table using PHP OOPs concept. For this things I have make one function delete with two parameter one is table name and is where condition. You can define table name and simply write where condition, from this two parameter it will generate delete query for remove data from table and execute that delete query. So this way this function is work, if want to get more information, you can learn in details from video also. 

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 $array;  
      }  
      public function select_where($table_name, $where_condition)  
      {  
           $condition = '';  
           $array = array();  
           foreach($where_condition as $key => $value)  
           {  
                $condition .= $key . " = '".$value."' AND ";  
           }  
           $condition = substr($condition, 0, -5);  
           $query = "SELECT * FROM ".$table_name." WHERE " . $condition;  
           $result = mysqli_query($this->con, $query);  
           while($row = mysqli_fetch_array($result))  
           {  
                $array[] = $row;  
           }  
           return $array;  
      }  
      public function update($table_name, $fields, $where_condition)  
      {  
           $query = '';  
           $condition = '';  
           foreach($fields as $key => $value)  
           {  
                $query .= $key . "='".$value."', ";  
           }  
           $query = substr($query, 0, -2);  
           /*This code will convert array to string like this-  
           input - array(  
                'key1'     =>     'value1',  
                'key2'     =>     'value2'  
           )  
           output = key1 = 'value1', key2 = 'value2'*/  
           foreach($where_condition as $key => $value)  
           {  
                $condition .= $key . "='".$value."' AND ";  
           }  
           $condition = substr($condition, 0, -5);  
           /*This code will convert array to string like this-  
           input - array(  
                'id'     =>     '5'  
           )  
           output = id = '5'*/  
           $query = "UPDATE ".$table_name." SET ".$query." WHERE ".$condition."";  
           if(mysqli_query($this->con, $query))  
           {  
                return true;  
           }  
      }  
      public function delete($table_name, $where_condition)  
      {  
           $condition = '';  
           foreach($where_condition as $key => $value)  
           {  
                $condition .= $key . " = '".$value."' AND ";  
                /*This code will convert array to string like this-  
                input - array(  
                     'id'     =>     '5'  
                )  
                output = id = '5'*/  
                $condition = substr($condition, 0, -5);  
                $query = "DELETE FROM ".$table_name." WHERE ".$condition."";  
                if(mysqli_query($this->con, $query))  
                {  
                     return true;  
                }  
           }  
      }  
 }  
 ?>  


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))  
      {  
           $success_message = 'Post Inserted';  
      }       
 }  
 if(isset($_POST["edit"]))  
 {  
      $update_data = array(  
           'post_title'     =>     mysqli_real_escape_string($data->con, $_POST['post_title']),  
           'post_desc'          =>     mysqli_real_escape_string($data->con, $_POST['post_desc'])  
      );  
      $where_condition = array(  
           'post_id'     =>     $_POST["post_id"]  
      );  
      if($data->update("tbl_posts", $update_data, $where_condition))  
      {  
           header("location:test_class.php?updated=1");  
      }  
 }  
 if(isset($_GET["updated"]))  
 {  
      $success_message = 'Post Updated';  
 }  
 if(isset($_GET["delete"]))  
 {  
      $where = array(  
           'post_id'     =>     $_GET["post_id"]  
      );  
      if($data->delete("tbl_posts", $where))  
      {  
           header("location:test_class.php?deleted=1");  
      }  
 }  
 if(isset($_GET["deleted"]))  
 {  
      $success_message = 'Post Deleted';  
 }  
 ?>  
 <!DOCTYPE html>  
 <html>  
      <head>  
           <title>Webslesson Tutorial | Delete Data from Mysql Table using OOPS in PHP</title>  
           <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap.min.css" />  
           <script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/js/bootstrap.min.js"></script>  
           <script src="https://ajax.googleapis.com/ajax/libs/jquery/2.2.0/jquery.min.js"></script>  
      </head>  
      <body>  
           <br /><br />  
           <div class="container" style="width:700px;">  
                <form method="post">  
                     <?php  
                     if(isset($_GET["edit"]))  
                     {  
                          if(isset($_GET["post_id"]))  
                          {  
                               $where = array(  
                                    'post_id'     =>     $_GET["post_id"]  
                               );  
                               $single_data = $data->select_where("tbl_posts", $where);  
                               foreach($single_data as $post)  
                               {  
                     ?>  
                          <label>Post Title</label>  
                          <input type="text" name="post_title" value="<?php echo $post["post_title"]; ?>" class="form-control" />  
                          <br />  
                          <label>Post Description</label>  
                          <textarea name="post_desc" class="form-control"><?php echo $post["post_desc"]; ?></textarea>  
                          <br />  
                          <input type="hidden" name="post_id" value="<?php echo $post["post_id"]; ?>" />  
                          <input type="submit" name="edit" class="btn btn-info" value="Edit" />  
                     <?php  
                               }  
                          }  
                     }  
                     else  
                     {  
                     ?>  
                          <label>Post Title</label>  
                          <input type="text" name="post_title" class="form-control" />  
                          <br />  
                          <label>Post Description</label>  
                          <textarea name="post_desc" class="form-control"></textarea>  
                          <br />  
                          <input type="submit" name="submit" class="btn btn-info" value="Submit" />  
                     <?php  
                     }  
                     ?>  
                     <span class="text-success">  
                     <?php  
                     if(isset($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>  
 <script>  
 $(document).ready(function(){  
      $('.delete').click(function(){  
           var post_id = $(this).attr("id");  
           if(confirm("Are you sure you want to delete this post?"))  
           {  
                window.location = "test_class.php?delete=1&post_id="+post_id+"";  
           }  
           else  
           {  
                return false;  
           }  
      });  
 });  
 </script>  

2 comments:

  1. hi please help me on this ask : http://stackoverflow.com/questions/37243940/after-load-page-with-ajax-form-submition-not-work :(

    ReplyDelete