display user input as comment on same page - php

Question

I'm trying to create a comment system on my webpage. I want the user to be able in input a comment and have it automatically display on the same page, and reload so that if another user wants to comment the previous comment will also be there. So far, I have created a database that takes in the comments. I have tried to display the comments by querying through my database and printing it out, but it just seems to crash my site.
This is the code I have so far
index.php:
<form action="insert.php" method="GET">
Comments:
<input type="text" name="field1_name"/>
<input type="submit" name="submit" value="submit"/>
</form>
<?php
$query="SELECT COMMENTS FROM parentComment";
$results = mysqli_query($query);
while ($row = mysqli_fetch_assoc($results)) {
echo $row['COMMENTS'];
}
?>
insert.php:
$user = 'x';
$password = '';
$db = 'comment_schema';
$host = 'localhost';
$port = 3306;
$link = mysqli_connect($host, $user, $password, $db);
mysqli_query($link,"GRANT ALL ON comment_schema TO 'x'#'localhost'");
if (mysqli_connect_errno()) {
printf("Connect failed: %s\n", mysqli_connect_error());
exit();
}
if(!empty($_GET["field1_name"])) {
$field1_name = mysqli_real_escape_string($link, $_GET["field1_name"]);
// Escape user inputs for security
$sql = "INSERT INTO parentComment (COMMENTS) VALUES ('$field1_name')";
$result = mysqli_query($link, $sql);
// attempt insert query execution
if ($result) {
//echo $_GET["field1_name"];
} else {
echo "ERROR: Could not able to execute $sql. " . mysqli_error($link);
}
// close connection
mysqli_close($link);
}
else{
die('comment is not set or not containing valid value');
}
So far everything works as in the comments are being inserted into the database. My problem is with retrieving the comments and displaying it to the user on the same page. I've tried to do so, but it seems to be not working. Not sure where I'm going wrong in my implementation (I've implemented it in the index.php file)

Answer 1

You didn't connect to your db for the query:
$results = mysqli_query($query);
Pass the connection to the query:
$results = mysqli_query($link, $query);
It's required.
http://php.net/manual/en/mysqli.query.php
You also need to make sure that you did establish a connection in that file, otherwise it won't work.