TYPESCRIPT

query products by category woocommerce

$args = array(
   'post_type'             => 'product',
   'post_status'           => 'publish',
   'ignore_sticky_posts'   => 1,
   'posts_per_page'        => '12',
   'tax_query'             => array(
        array(
            'taxonomy'  => 'product_cat',
            'field'     => 'term_id',
            'terms'     => array('40'),
            'operator'  => 'IN',
        )
   )
);

$loop = new WP_Query( $args );

query orders by products woocommerce

/**
 * Get All orders IDs for a given product ID.
 *
 * @param  integer  $product_id (required)
 * @param  array    $order_status (optional) Default is 'wc-completed'
 *
 * @return array
 */
function get_orders_ids_by_product_id( $product_id, $order_status = array( 'wc-completed' ) ){
    global $wpdb;

    $results = $wpdb->get_col("
        SELECT order_items.order_id
        FROM {$wpdb->prefix}woocommerce_order_items as order_items
        LEFT JOIN {$wpdb->prefix}woocommerce_order_itemmeta as order_item_meta ON order_items.order_item_id = order_item_meta.order_item_id
        LEFT JOIN {$wpdb->posts} AS posts ON order_items.order_id = posts.ID
        WHERE posts.post_type = 'shop_order'
        AND posts.post_status IN ( '" . implode( "','", $order_status ) . "' )
        AND order_items.order_item_type = 'line_item'
        AND order_item_meta.meta_key = '_product_id'
        AND order_item_meta.meta_value = '$product_id'
    ");

    return $results;
}