判断数据库是否打开

/** * 判断数据库是否连接 *  * @return */public static boolean isConnected() {Connection conn = DBHelper.getConn();try {if (null != conn) {if (!conn.isClosed()) {isPass = true;}}} catch (Exception e) {isPass = false;e.printStackTrace();} finally {closeAll(conn);}return isPass;}