Question

I try to do the like counter for forum threads. This is my code:

When like button is on click, it will insert the value into database.

public void submitLike(ActionEvent e) {
    int count = 0;
    int newCount = count + 1;
    eForumLikeDislike amount = new eForumLikeDislike(userName,topicId,newCount);
    amount.likeCounter();
}

The SQL statement which I insert like when it is on click.

 public void SetUpLikeAmount() {
    int likes = 0;
    ArrayList <Integer> likeArray = new ArrayList <Integer>();
    for (int count = 0; count < likeArray.size();count++){
    // Set Up Database Source
    db.setUp("IT Innovation Project");
    String sql = "Select likeDislike_likes from forumLikeDislike WHERE topic_id = "
            + topicId + "";
    ResultSet resultSet = null;
    // Call readRequest to get the result
    resultSet = db.readRequest(sql);
    try {
        while (resultSet.next()) {
            likeArray.add(Integer.parseInt(resultSet.getString("likeDislike_likes")));
        }
        resultSet.close();
    } catch (Exception e) {
        System.out.println(e);
    }
    likes += likeArray.get(count);
    }
    jLabel_like.setText(Integer.toString(likes));
}

The method which I try to display the total likes of certain thread.

public void SetUpLikeAmount() {
    int likes = 0;
    ArrayList <Integer> likeArray = new ArrayList <Integer>();
    for (int count = 0; count < likeArray.size();count++) {
        // Set Up Database Source
        db.setUp("IT Innovation Project");
        String sql = "Select likeDislike_likes from forumLikeDislike WHERE topic_id = "
                     + topicId + "";
        ResultSet resultSet = null;
        // Call readRequest to get the result
        resultSet = db.readRequest(sql);
        try {
            while (resultSet.next()) {
                likes = Integer.parseInt(resultSet.getString("likeDislike_likes"));
                likes += likeArray.get(count);
            }
            resultSet.close();
        } catch (Exception e) {
            System.out.println(e);
        }

    }
    jLabel_like.setText(Integer.toString(likes));
}

However, the amount keep returning me 0. Is there something wrong? How can I fix it?
Thanks in advance.

Answer 1

If you are able to change your database design, do so. Specifically, drop the field likeDislike_likes from table forumLikeDislike.

Once you have done that (or even if you don’t), you can replace this query,

Select likeDislike_likes 
from forumLikeDislike 
WHERE topic_id = the topicId variable you submit

with this query:

select count(*) likes
from forumLikeDislike 
WHERE topic_id = the topicId variable you submit

It will return one row with the answer you want.