Database not working on the root of Wordpress theme - mysql

Question

I have created my own table on my wordpress database and created the filter search form. Now, my problem is that, I dont know how to connect my database to my search filter form in wordpress.
Here is the process, I send the keyword from index.php to result.php, and it shows nothing, just a blank page.
Here's my code:
<?php
define('WP_USE_THEMES', false);
global $wpdb;
$destination = $_POST["destination"];
echo "Welcome test" . $destination;
$sql = "SELECT * FROM rates WHERE location = '" . $destination ."';";
echo $sql;
echo "search this";
foreach ( $wpdb->get_results($sql) as $result ) {
echo "search for". $result->location;
}
?>

Answer 1

wp-content/themes/Your-Theme-Name/result.php
<?php
/*
* Template Name: MyResultPage
*/
/* You can also use require_once('wp-load.php'); */
get_header();
global $wpdb;
$destination = $_POST["destination"];
$table = $wpdb->prefix . "rates";
$sql = "SELECT * FROM `". $table . "` WHERE location = '". $destination. "'" ;
$result = $wpdb->get_results($sql);
foreach($result as $res) {
echo "search for". $res->location;
}
?>
Then, you create a new page in your wordpress admin and set the template to result.php template name: MyResultPage (for example).

Answer 2

you should either include wp-config.php file in the header of the file which will include all the relevant files in your page.

Answer 3

Can you plz check below code and it output.
i added one page in root directory of WordPress and make one page and add this code.
test.php
<?php
define('WP_USE_THEMES', false);
require_once('wp-load.php');
global $wpdb;
$result = $wpdb->get_results(("SELECT * FROM {$wpdb->prefix}posts WHERE post_type = 'page'"), ARRAY_A);
foreach( $result as $key => $val )
{
echo '<p>Title - '.$val['post_name'].'</p>';
echo '<p>ID - '.$val['ID'].'</p>';
}
?>
Now here is out put of this page it shows all page title and id.
Output:
<p>Title - sample-page</p>
<p>ID - 2</p>
<p>Title - sample-page1</p>
<p>ID - 3</p>