@Override
public void saveEventDetails(Event event) {
// TODO Auto-generated method stub
// Opening a session to create a database connection
Session session = this.sessionFactory.openSession();
// for CRUD operations, we need to create a transaction
Transaction tx = null;
// adding a try catch block for maintaining the atomicity of transaction
try {
tx = session.beginTransaction();
System.out.println("DbHelper..saveEventDetails");
// session save inserts the object into DB
session.save(event);
tx.commit();
System.out.println("Event saved");
} catch (HibernateException e) {
if (tx != null) {
tx.rollback();
e.printStackTrace();
}
} finally {
session.close();
}
}
public List<User> getUserSearchResults(int topicId) {
// TODO Auto-generated method stub
List<User> userArr = new ArrayList<User>();
Session session = sessionFactory.openSession();
Transaction tx = null;
try {
tx = session.beginTransaction();
Query query1 = session.createQuery("select userId from UserTopic where topicId = :topicId");
query1.setString("topicId", String.valueOf(topicId));
Query query2 = session.createQuery("from User where userId in (:userList)");
query2.setParameterList("userList", query1.list());
userArr = query2.list();
/*for(Topic topic : topicArr){
System.out.println("Topic Description----"+topic.getTopicDescription());
System.out.println("Topic Id----"+topic.getTopicId());
}*/
} catch (HibernateException e) {
if (tx != null) {
tx.rollback();
e.printStackTrace();
}
} finally {
session.close();
}
return userArr;
}
@Override
public List<Forum> getForumsOfaUser(int userId) {
// TODO Auto-generated method stub
List<Forum> forums = new ArrayList<Forum>();
Session session = sessionFactory.openSession();
Transaction tx = null;
try {
tx = session.beginTransaction();
Query query = session.createQuery("from Subscription where userId = :userId");
query.setString("userId", String.valueOf(userId));
List<Subscription> userSubscribedGroups = query.list();
for (Subscription subsc : userSubscribedGroups) {
query = session.createQuery("from Forum where forumId = :forumId");
query.setParameter("forumId", subsc.getForumId());
// add this to a list variable query.uniqueResult();
forums.add((Forum) query.uniqueResult());
}
} catch (HibernateException e) {
if (tx != null) {
tx.rollback();
e.printStackTrace();
}
} finally {
session.close();
}
return forums;
}
@Override
public List<Reply> getRepliesToPost(int postId) {
// TODO Auto-generated method stub
Session session = sessionFactory.openSession();
Transaction tx = null;
List<Reply> replyArr = new ArrayList<Reply>();
try {
tx = session.beginTransaction();
Query query =
session.createQuery("from Reply where postId = :postId order by createdDate desc");
query.setParameter("postId", postId);
replyArr = query.list();
/* for(Reply reply : replyArr){
System.out.println("Reply - id----"+reply.getReplyId());
System.out.println("Reply - Description----"+reply.getDescription());
System.out.println("Reply - Post id----"+reply.getPostId());
}*/
} catch (HibernateException e) {
if (tx != null) {
tx.rollback();
e.printStackTrace();
}
} finally {
session.close();
}
return replyArr;
}
public int getCountOfSubscribers(int forumId, int userId) {
// TODO Auto-generated method stub
Session session = this.sessionFactory.openSession();
Transaction tx = null;
int countOfSubscribers = 0;
try {
tx = session.beginTransaction();
Query query = null;
if (userId == 0) {
query = session.createQuery("select count(*) from Subscription where forumId = :forumId");
query.setParameter("forumId", forumId);
} else {
query =
session.createQuery(
"select count(*) from Subscription where forumId = :forumId and userId = :userId");
query.setParameter("forumId", forumId);
query.setParameter("userId", userId);
}
Long count = (Long) query.uniqueResult();
countOfSubscribers = count.intValue();
// System.out.println("No of subscribers.."+countOfSubscribers);
} catch (HibernateException e) {
if (tx != null) {
tx.rollback();
e.printStackTrace();
}
} finally {
session.close();
}
return countOfSubscribers;
}
@Override
public void deleteSubscription(int userId, int forumId) {
// TODO Auto-generated method stub
Session session = this.sessionFactory.openSession();
Transaction tx = null;
try {
tx = session.beginTransaction();
Query query =
session.createQuery(
"delete from Subscription where userId = :userId and forumId = :forumId");
query.setParameter("userId", userId);
query.setParameter("forumId", forumId);
int result = query.executeUpdate();
System.out.println("Execute query..");
if (result > 0) {
tx.commit();
// System.out.println("Subscription Removed..");
} else {
// System.out.println("Subscription does not exist");
tx.rollback();
}
} catch (HibernateException e) {
if (tx != null) {
tx.rollback();
e.printStackTrace();
}
} finally {
session.close();
}
}
@Override
public void saveUserTopic(UserTopic userTopic) {
Session session = this.sessionFactory.openSession();
Transaction tx = null;
try {
tx = session.beginTransaction();
session.save(userTopic);
tx.commit();
// System.out.println("Forum Committed..")
} catch (HibernateException e) {
if (tx != null) {
tx.rollback();
e.printStackTrace();
}
} finally {
session.close();
}
}
@Override
public void savePostDetails(Post post) {
// TODO Auto-generated method stub
Session session = this.sessionFactory.openSession();
Transaction tx = null;
try {
tx = session.beginTransaction();
session.save(post);
tx.commit();
// System.out.println("Post Committed..");
} catch (HibernateException e) {
if (tx != null) {
tx.rollback();
e.printStackTrace();
}
} finally {
session.close();
}
}
@Override
public List<Event> getEventDetails(int userId) {
// TODO Auto-generated method stub
List<Event> events = new ArrayList<Event>();
Session session = sessionFactory.openSession();
Transaction tx = null;
try {
tx = session.beginTransaction();
Query query = session.createQuery("from Event");
events = query.list();
} catch (HibernateException e) {
if (tx != null) {
tx.rollback();
e.printStackTrace();
}
} finally {
session.close();
}
return events;
}
public Forum getForumById(int forumId) {
// TODO Auto-generated method stub
Session session = sessionFactory.openSession();
Transaction tx = null;
Forum forum = new Forum();
try {
tx = session.beginTransaction();
forum = (Forum) session.get(Forum.class, forumId);
// System.out.println("First Name - "+user.getFirstname());
// System.out.println("Last Name - "+user.getLastname());
} catch (HibernateException e) {
if (tx != null) {
tx.rollback();
e.printStackTrace();
}
} finally {
session.close();
}
return forum;
}
public User getUser(String username) {
// TODO Auto-generated method stub
System.out.println("DbHelper->getUser...");
Session session = sessionFactory.openSession();
Transaction tx = null;
User user = new User();
try {
tx = session.beginTransaction();
Query query = session.createQuery("from User where emailId = :emailId");
query.setString("emailId", username);
user = (User) query.uniqueResult();
} catch (HibernateException e) {
if (tx != null) {
tx.rollback();
e.printStackTrace();
}
} finally {
session.close();
}
return user;
}
public List<Domain> getDomains() {
List<Domain> domainArr = new ArrayList<Domain>();
Session session = sessionFactory.openSession();
Transaction tx = null;
try {
tx = session.beginTransaction();
Query query = session.createQuery("from Domain");
domainArr = query.list();
/*for(Topic topic : topicArr){
System.out.println("Topic Description----"+topic.getTopicDescription());
System.out.println("Topic Id----"+topic.getTopicId());
}*/
} catch (HibernateException e) {
if (tx != null) {
tx.rollback();
e.printStackTrace();
}
} finally {
session.close();
}
return domainArr;
}
@Override
public User getUser(int userId) {
// TODO Auto-generated method stub
System.out.println("DbHelper->getUser...");
Session session = sessionFactory.openSession();
Transaction tx = null;
User user = new User();
try {
tx = session.beginTransaction();
user = (User) session.get(User.class, userId);
// System.out.println("First Name - "+user.getFirstname());
// System.out.println("Last Name - "+user.getLastname());
} catch (HibernateException e) {
if (tx != null) {
tx.rollback();
e.printStackTrace();
}
} finally {
session.close();
}
return user;
}
@SuppressWarnings("unchecked")
public List<PostAndReply> getPostsAndReplies(int forumId) {
// TODO Auto-generated method stub
Session session = sessionFactory.openSession();
Transaction tx = null;
List<Post> postArr = new ArrayList<Post>();
List<PostAndReply> prArray = new ArrayList<PostAndReply>();
try {
tx = session.beginTransaction();
Query query =
session.createQuery("from Post where forumId = :forumId order by createdDate desc");
query.setParameter("forumId", forumId);
postArr = query.list();
System.out.println("No of posts.." + postArr.size());
for (Post post : postArr) {
int postId = post.getPostId();
System.out.println("Post id----" + postId);
List<Reply> replies = getRepliesToPost(postId);
User user = getUser(post.getCreatedBy());
String postCreatorName = user.getFirstname() + ' ' + user.getLastname();
PostAndReply pr = new PostAndReply();
pr.setPost(post);
pr.setReplies(replies);
pr.setPostCreatorName(postCreatorName);
prArray.add(pr);
// System.out.println("Post - Description----"+post.getDescription());
// System.out.println("No of Replies----"+replies.size());
}
} catch (HibernateException e) {
if (tx != null) {
tx.rollback();
e.printStackTrace();
}
} finally {
session.close();
}
return prArray;
}
public List<Forum> getSearchResults(int topicId) {
List<Forum> forumArr = new ArrayList<Forum>();
Session session = sessionFactory.openSession();
Transaction tx = null;
try {
tx = session.beginTransaction();
Query query = session.createQuery("from Forum where topicId = :topicId");
query.setString("topicId", String.valueOf(topicId));
forumArr = query.list();
/*for(Topic topic : topicArr){
System.out.println("Topic Description----"+topic.getTopicDescription());
System.out.println("Topic Id----"+topic.getTopicId());
}*/
} catch (HibernateException e) {
if (tx != null) {
tx.rollback();
e.printStackTrace();
}
} finally {
session.close();
}
return forumArr;
}
@Override
public List<Topic> getTopics() {
// TODO Auto-generated method stub
List<Topic> topicArr = new ArrayList<Topic>();
Session session = sessionFactory.openSession();
Transaction tx = null;
try {
tx = session.beginTransaction();
Query query = session.createQuery("from Topic");
topicArr = query.list();
/*for(Topic topic : topicArr){
System.out.println("Topic Description----"+topic.getTopicDescription());
System.out.println("Topic Id----"+topic.getTopicId());
}*/
} catch (HibernateException e) {
if (tx != null) {
tx.rollback();
e.printStackTrace();
}
} finally {
session.close();
}
return topicArr;
}
@SuppressWarnings("unchecked")
@Override
public List<Post> getPostsInForum(int forumId) {
// TODO Auto-generated method stub
// System.out.println("DbHelper->getPostsInForum...");
Session session = sessionFactory.openSession();
Transaction tx = null;
List<Post> postArr = new ArrayList<Post>();
try {
tx = session.beginTransaction();
Query query =
session.createQuery("from Post where forumId = :forumId order by createdDate desc");
query.setParameter("forumId", forumId);
postArr = query.list();
} catch (HibernateException e) {
if (tx != null) {
tx.rollback();
e.printStackTrace();
}
} finally {
session.close();
}
return postArr;
}