function dynamic_db_dropdown_shortcode_city_field() {
    global $wpdb;
    // 

    get_hoa_db();
    $results = $wpdb->get_col( "SELECT city FROM {$wpdb->prefix}hoa_location" );
    
    if ( empty($results) ) {
        return 'No items found.';
    }

    $output = '<select name="db_dropdown_field" id="db_dropdown_field">';
    $output .= '<option value="">Select an option</option>';
    
    foreach ( $results as $row ) {
        $output .= '<option value="' . esc_attr( $row ) . '">' . esc_html( $row ) . '</option>';
    }
    
    $output .= '</select>';
    return $output;
}
add_shortcode('db_ddwn', 'dynamic_db_dropdown_shortcode_city_field');

function get_hoa_db () 
{
    static $hoa_db = null;
    if (isnull($hoa_db))
    {
        // database definition is in wp_config.php located in the ... dierctory
        $hoa_db = new wpdb(DB2_USER, DB2_PASSWORD, DB2_NAME, DB2_HOST);
        $hoa_db->set_prefix(DB2_PREFIX, false);
    }
    return $hoa_db;
}
    
add_action('activate_second_database', 'get_hoa_db');
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