小编Mad*_*ddy的帖子

我有一个电影数据库的以下数据集:

评分:UserID,MovieID,评级电影:MovieID,类型用户:UserID,性别,年龄

我写了一个PIG脚本,以获得评分最高的电影的年龄组(20-30)的女性用户.以下是我到目前为止的代码:

users_input = load '/users.dat' USING PigStorage('\u003B') as (UserID: long, gender: chararray, age: int, occupation: int, zip: long);
movies_input = load '/movies.dat' USING PigStorage('\u003B') as (MovieID: long, title: chararray, genre: chararray);
ratings_input = load '/ratings.dat' USING PigStorage('\u003B') as (UserID: long, MovieID: long, rating: int, timestamp: chararray);

movie_filter = filter movies_input by (genre matches '.*Action.*') OR (genre matches '.*War.*');

temp = COGROUP movie_filter by MovieID, ratings_input by MovieID;

temp1 = FILTER temp BY COUNT(movie_filter) > 0;

temp2 = FOREACH …

只有当所有字段中都存在有效数据时才会启用两个按钮,即数字值和无负数.您是如何做到的？

我有一个用户定义的类Message,我想在客户端和服务器之间传递它的对象.

Message类如下:

import java.io.Serializable;

public class Message implements Serializable
{
    String CorS;
    int data_id;
    int status_id;
    Integer value;
    boolean withdraw;

    public Message()
    {
        CorS = null;
        data_id = 0;
        status_id = 0;
        value = 0;
        withdraw = false;
    }

    public Message(String CorS, int data_id, int status_id, Integer value)
    {
        this.CorS = CorS;
        this.data_id = data_id;
        this.status_id = status_id;
        this.value = value;
    }

    public Message(boolean withdraw)
    {
        this.withdraw = withdraw;
    }
}

将对象发送到服务器的客户端代码如下:

Socket s = null;
    ObjectInputStream in = null; …