db_connect example

$this->dbuser     = $dbuser;
        $this->dbpassword = $dbpassword;
        $this->dbname     = $dbname;
        $this->dbhost     = $dbhost;

        // wp-config.php creation will manually connect when ready.         if ( defined( 'WP_SETUP_CONFIG' ) ) {
            return;
        }

        $this->db_connect();
    }

    /** * Makes private properties readable for backward compatibility. * * @since 3.5.0 * * @param string $name The private member to get, and optionally process. * @return mixed The private member. */
    public function __get( $name ) {
        

// Default name space is the app namespace         $this->namespace = APP_NAMESPACE;

        // get default database group         $config      = config(Database::class);
        $this->group = $config->defaultGroup;
        unset($config);

        // If no db connection passed in, use         // default database group.         $this->db = db_connect($db);
    }

    /** * Locate and run all new migrations * * @return bool * * @throws ConfigException * @throws RuntimeException */
    public function latest(?string $group = null)
    {

define( 'DB_HOST', $dbhost );
        /**#@-*/

        // Re-construct $wpdb with these new values.         unset( $wpdb );
        require_wp_db();

        /* * The wpdb constructor bails when WP_SETUP_CONFIG is set, so we must * fire this manually. We'll fail here if the values are no good. */
        $wpdb->db_connect();

        if ( ! empty( $wpdb->error ) ) {
            wp_die( $wpdb->error->get_error_message() . $tryagain_link );
        }

        $errors = $wpdb->suppress_errors();
        $wpdb->query( "SELECT $prefix" );
        $wpdb->suppress_errors( $errors );

        if ( ! $wpdb->last_error ) {
            // MySQL was able to parse the prefix as a value, which we don't want. Bail.