I am retrieving values from the database into the form for update, on the press of the submit button, the values should get updated.
Here's the code:
PostUpdate.php:
<?php
session_start();
$username=$_SESSION['uname'];
$cn=mysqli_connect("localhost", "root", "", "imedtalks");
// Define variables and initialize with empty values
$course = $category = "";
$title = $descp = "";
// Processing form data when form is submitted
if(isset($_POST["pid"]) && !empty($_POST["pid"])){
// Get hidden input value
$pid = $_POST["pid"];
// Check input errors before inserting in database
if(!empty($course) && !empty($category) && !empty($title) && !empty($descp)){
// Prepare an update statement
$sql = "UPDATE posts SET course=?, category=?, title=?, descp=? WHERE pid=?";
if($stmt = mysqli_prepare($cn, $sql)){
// Bind variables to the prepared statement as parameters
mysqli_stmt_bind_param($stmt, "ssssi", $param_course, $param_category, $param_title, $param_descp, $param_pid);
// Set parameters
$param_course = $course;
$param_category = $category;
$param_title = $title;
$param_descp = $descp;
$param_pid = $pid;
// Attempt to execute the prepared statement
if(mysqli_stmt_execute($stmt)){
// Records updated successfully. Redirect to landing page
header("location: BCAposts.php");
exit();
} else{
echo "Something went wrong. Please try again later.";
}
// Close statement
mysqli_stmt_close($stmt);
}
}
// Close connection
mysqli_close($cn);
} else{
// Check existence of id parameter before processing further
if(isset($_GET["pid"]) && !empty(trim($_GET["pid"]))){
// Get URL parameter
$pid = trim($_GET["pid"]);
//echo $pid;
// Prepare a select statement
$sql = "SELECT pid,course,category,title,descp FROM posts WHERE pid = ?";
if($stmt = mysqli_prepare($cn, $sql)){
// Bind variables to the prepared statement as parameters
mysqli_stmt_bind_param($stmt, "i", $param_pid);
// Set parameters
$param_pid = $pid;
//echo $param_pid;
// Attempt to execute the prepared statement
if(mysqli_stmt_execute($stmt)){
$result = mysqli_stmt_get_result($stmt);
if(mysqli_num_rows($result) == 1){
/* Fetch result row as an associative array. Since the result set contains only one row, we don't need to use while loop */
$row = mysqli_fetch_array($result, MYSQLI_ASSOC);
//echo '<pre>', var_dump($row) ,'</pre>';
// Retrieve individual field value
$pid = $row['pid'];
$course = $row['course'];
$category = $row['category'];
$title = $row['title'];
$descp = $row['descp'];
} else{
// URL doesn't contain valid id. Redirect to error page
header("location: BCAposts.php");
exit();
}
} else{
echo "Oops! Something went wrong. Please try again later.";
}
}
// Close statement
mysqli_stmt_close($stmt);
// Close connection
mysqli_close($cn);
} else{
// URL doesn't contain id parameter. Redirect to error page
header("location: BCAposts.php");
exit();
}
}
?>
<html>
<head>
<title>IMEDTalks-Post-
<?php echo $title;?>
</title>
<link href="./css/bootstrap.min.css" rel="stylesheet" />
<script src="./scripts/jquery-3.3.1.min.js"></script>
<script src="./scripts/bootstrap.min.js"></script>
<style>
/* Make the image fully responsive */
.carousel-inner img {
width: 100%;
height: 30%;
}
</style>
</head>
<body>
<div id="mycarousel" class="carousel slide" data-ride="carousel">
<ol class="carousel-indicators">
<li data-target="#mycarousel" data-slide-to="0" class="active"></li>
<li data-target="#mycarousel" data-slide-to="1"></li>
<li data-target="#mycarousel" data-slide-to="2"></li>
</ol>
<div class="carousel-inner">
<div class="carousel-item active">
<img src="./images/banner1.jpg" alt="First slide">
</div>
<div class="carousel-item">
<img src="http://placehold.it/1200x675&text=Second+slide" alt="Second slide">
</div>
<div class="carousel-item">
<img src="http://placehold.it/1200x675&text=Third+slide" alt="Third slide">
</div>
</div>
<a class="carousel-control-prev" href="#mycarousel" role="button" data-slide="prev">
<span class="carousel-control-prev-icon" aria-hidden="true"></span>
<span class="sr-only">Previous</span>
</a>
<a class="carousel-control-next" href="#mycarousel" role="button" data-slide="next">
<span class="carousel-control-next-icon" aria-hidden="true"></span>
<span class="sr-only">Next</span>
</a>
</div>
<nav class="navbar navbar-expand-sm navbar-light bg-light">
<a class="navbar-brand" href="UserHomePage.html"><img src="./images/brand.png" alt="logo" style="width:40px;"></a>
<button class="navbar-toggler d-lg-none" type="button" data-toggle="collapse" data-target="#collapsibleNavId" aria-controls="collapsibleNavId" aria-expanded="false" aria-label="Toggle navigation">
<span class="navbar-toggler-icon"></span>
</button>
<div class="collapse navbar-collapse" id="collapsibleNavId">
<ul class="navbar-nav mr-auto mt-2 mt-lg-0">
<li class="nav-item active">
<a class="nav-link" href="UserHomePage.html">Home <span class="sr-only">(current)</span></a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">Official Announcements</a>
</li>
<li class="nav-item dropdown">
<a class="nav-link dropdown-toggle" href="#" id="dropdownId" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">Discussion Forum</a>
<div class="dropdown-menu" aria-labelledby="dropdownId">
<a class="dropdown-item" href="#">BCA</a>
<a class="dropdown-item" href="MCAposts.php">MCA</a>
</div>
</li>
<li class="nav-item">
<a class="nav-link" href="Post.php">Quick Post</a>
</li>
<li class="nav-item dropdown">
<a class="nav-link dropdown-toggle" href="#" id="dropdownId" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">Fun Zone</a>
<div class="dropdown-menu" aria-labelledby="dropdownId">
<a class="dropdown-item" href="Articles.html">Articles</a>
<a class="dropdown-item" href="ChitChat.html">Chit Chat</a>
</div>
</li>
<li class="nav-item dropdown">
<a class="nav-link dropdown-toggle" href="#" id="dropdownId" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">Resource Contents</a>
<div class="dropdown-menu" aria-labelledby="dropdownId">
<a class="dropdown-item" href="#">Course Syllabus</a>
<a class="dropdown-item" href="#">Study Materials</a>
<a class="dropdown-item" href="#">Previous Year Question Papers</a>
<a class="dropdown-item" href="#">Reference Books</a>
</div>
</li>
<li class="nav-item">
<a class="nav-link" href="FAQ.html">FAQ</a>
</li>
<li class="nav-item">
<a class="nav-link" href="AboutUs.html">About Us</a>
</li>
<li class="nav-item">
<a class="nav-link" href="ContactUs.html">Contact Us</a>
</li>
</ul>
<div>
<ul class="navbar-nav mr-auto mt-2 mt-lg-0">
<li class="nav-item dropdown btn-primary">
<a class="nav-link dropdown-toggle" href="#" id="dropdownId" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">Welcome!
<?php echo $_SESSION['uname']; ?>
</a>
<div class="dropdown-menu" aria-labelledby="dropdownId">
<a class="dropdown-item" href="#">Profile</a>
<a class="dropdown-item" href="HomePage.php">Sign Out</a>
</div>
</li>
</ul>
</div>
</div>
</nav>
<br>
<div class="wrapper">
<div class="container-fluid">
<div class="row">
<div class="col-md-12">
<div class="page-header">
<h2 class="text-center">Update Post</h2>
</div>
<p class="text-center">Please edit the input values and submit to update the post.</p>
<form action="<?php echo htmlspecialchars(basename($_SERVER['REQUEST_URI'])); ?>" method="post">
<div class="form-group">
<div class="row">
<label class="col-form-label col-md-1 offset-3" for="course">Course:</label>
<div class="col-md-2">
<select name="course" class="form-control" required>
<option value="<?php echo $course;?>" selected>
<?php echo $course;?>
</option>
<option value="">Choose any:</option>
<option value="bca">BCA</option>
<option value="mca">MCA</option>
</select>
</div>
<label class="col-form-label col-md-1" for="category">Category:</label>
<div class="col-md-3">
<select name="category" class="form-control" required>
<option value="<?php echo $category;?>" selected>
<?php echo $category;?>
</option>
<option value="">Choose any:</option>
<option value="plang">Programming Language</option>
<option value="web">Web Technologies</option>
<option value="maths">Mathematics and Statistics</option>
<option value="db">Database</option>
<option value="ds">Data Structures</option>
<option value="os">Operating Systems</option>
<option value="mngmt">Management</option>
<option value="pro">Project</option>
<option value="skills">Soft Skills</option>
<option value="intern">Internships</option>
<option value="plcmnt">Placements</option>
<option value="others">Others</option>
</select>
</div>
</div>
</div>
<div class="form-group row">
<label for="title" class="col-form-label col-md-2">Title:
</label>
<div class="col-md-10">
<input type="text" class="form-control" value="<?php echo $title;?>" name="title" required>
</div>
</div>
<div class="form-group row">
<label for="desc" class="col-form-label col-md-12">Description:
</label>
<div class="col-md-12">
<textarea class="form-control" name="descp" rows="20" required><?php echo $descp;?></textarea>
</div>
</div>
<input type="hidden" name="pid" value="<?php echo $pid;?>" />
<div class="form-group row">
<div class="col-md-4 offset-4">
<a href="MCAposts.php"><button type="button" name="cancel"
class="btn-lg btn-danger">Cancel</button></a>
</div>
<div class="col-md-4">
<button type="submit" name="update" class="btn-lg btn-success">Submit</button>
</div>
</div>
</form>
</div>
</div>
</div>
</div>
</body>
</html>Here, i am using pid which is being bought from the previous page where the data is listed in table format, and on the click of a button there, that data/post gets loaded into the form for editing and updating the same using the pid(primary key in my database table) Iam using bootstrap 4.
Problem i am facing:
The update operation is not performed. No changes in the database table values. No error shown.
I can't figure out whats going wrong here.
</div>
