Why wpdb not working?

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<?php
if($_SERVER[‘REQUEST_METHOD’] == “GET”){
global $wpdb, $table_prefix;
    $tableName = $table_prefix . “contact_ways”;
    $id = $_GET[‘id’];
echo $id.”<br>”.$tableName.”<br>”;
    $row = $wpdb->get_results(“SELECT * FROM $tableName WHERE id=$id”);
}

it retunes

1
contact_ways

Fatal error: Uncaught Error: Call to a member function get_results() on null in C:\xampp\htdocs\wordpress\wp-content\plugins\connectUs\state_action.php:7 Stack trace: #0 {main} thrown in C:\xampp\htdocs\wordpress\wp-content\plugins\connectUs\state_action.php on line 7

after that i try this

<?php
define(‘WP_USE_THEMES’, false);
global $wpdb;
require( ‘wp-load.php’ );
if($_SERVER[‘REQUEST_METHOD’] == “GET”){
global $wpdb, $table_prefix;
$tableName = $table_prefix . “contact_ways”;
$id = $_GET[‘id’];
echo $id.”<br>”.$tableName.”<br>”;
$row = $wpdb->get_results(“SELECT * FROM $tableName WHERE id=$id”);
}

it retunes

Warning: require(wp-load.php): failed to open stream: No such file or directory in C:\xampp\htdocs\wordpress\wp-content\plugins\connectUs\state_action.php on line 4

Warning: require(wp-load.php): failed to open stream: No such file or directory in C:\xampp\htdocs\wordpress\wp-content\plugins\connectUs\state_action.php on line 4

Fatal error: require(): Failed opening required ‘wp-load.php’ (include_path=’C:\xampp\php\PEAR’) in C:\xampp\htdocs\wordpress\wp-content\plugins\connectUs\state_action.php on line 4

How can i fix this?!

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