java7新特性

      今天看了java7的预览版，过一段就会出测试版，测试版应该不会再加功能，只是修改bug。今天研究的是java7的新功能jdbc4。JDBC4一个 重要的新特性是在连接数据库后不用手动的关闭java.sql.Connection, java.sql.Statement, and java.sql.ResultSet这些对象。只要这些对象在try模块中声明，JVM会自动关闭这些对象。下面就是一个简单的例子：

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);
    }
  }

  下面还有一些小的新特性，等我整理了再发出来！如果不好，请大家提意见，请大家高抬贵手不要打隐藏贴，谢谢！

 

评论

2 楼 myzhijie 2011-04-02  

isaac.198 写道

谢谢 呵呵

1 楼 isaac.198 2011-04-02