public static void viewTable(Connection con) throws SQLException { String query = "select COF_NAME, SUP_ID, PRICE, SALES, TOTAL from COFFEES"; try (Statement stmt = con.createStatement()) { ResultSet rs = stmt.executeQuery(query); while (rs.next()) { String coffeeName = rs.getString("COF_NAME"); int supplierID = rs.getInt("SUP_ID"); float price = rs.getFloat("PRICE"); int sales = rs.getInt("SALES"); int total = rs.getInt("TOTAL"); System.out.println(coffeeName + ", " + supplierID + ", " + price + ", " + sales + ", " + total); } } catch (SQLException e) { JDBCTutorialUtilities.printSQLException(e); } }
我认为这个功能很好,防止了忘记释放这些对象照成的内存消耗过大。在上面的代码中声明了一个对象stmt,在try结束后jvm会自动关闭它。可能大家还会有疑问,就是如果在try中出现了异常,还会自动关闭这些对象吗?答案是会关闭。大家如果有不同的看法,欢迎讨论交流。