Hibernate cascade task solution

mate-academy · Jul 28, 2024 · f2497e7 · f2497e7
1 parent 7777544
commit f2497e7
Show file tree

Hide file tree

Showing 11 changed files with 302 additions and 15 deletions.
diff --git a/src/main/java/core/basesyntax/HibernateUtil.java b/src/main/java/core/basesyntax/HibernateUtil.java
@@ -4,7 +4,7 @@
 import org.hibernate.cfg.Configuration;
 
 public class HibernateUtil {
-    private static SessionFactory sessionFactory = initSessionFactory();
+    private static final SessionFactory sessionFactory = initSessionFactory();
 
     private HibernateUtil() {
     }

diff --git a/src/main/java/core/basesyntax/dao/impl/CommentDaoImpl.java b/src/main/java/core/basesyntax/dao/impl/CommentDaoImpl.java
@@ -3,7 +3,9 @@
 import core.basesyntax.dao.CommentDao;
 import core.basesyntax.model.Comment;
 import java.util.List;
+import org.hibernate.Session;
 import org.hibernate.SessionFactory;
+import org.hibernate.Transaction;
 
 public class CommentDaoImpl extends AbstractDao implements CommentDao {
     public CommentDaoImpl(SessionFactory sessionFactory) {
@@ -12,21 +14,74 @@ public CommentDaoImpl(SessionFactory sessionFactory) {
 
     @Override
     public Comment create(Comment entity) {
-        return null;
+        Session session = null;
+        Transaction transaction = null;
+        try {
+            session = factory.openSession();
+            transaction = session.beginTransaction();
+
+            session.persist(entity);
+            transaction.commit();
+            return entity;
+
+        } catch (Exception e) {
+            if (transaction != null) {
+                transaction.rollback();
+            }
+            throw new RuntimeException("Can't add Comment object in database", e);
+        } finally {
+            if (session != null) {
+                session.close();
+            }
+        }
     }
 
     @Override
     public Comment get(Long id) {
-        return null;
+        Comment comment = null;
+
+        try (Session session = factory.openSession()) {
+            comment = session.get(Comment.class, id);
+        } catch (Exception e) {
+            throw new RuntimeException("Can't retrieve Comment object by id:" + id, e);
+        }
+
+        return comment;
     }
 
     @Override
     public List<Comment> getAll() {
-        return null;
+        List<Comment> commentList = null;
+
+        try (Session session = factory.openSession()) {
+            commentList = session.createQuery("FROM Comment", Comment.class).list();
+        } catch (Exception e) {
+            throw new RuntimeException("Can't retrieve all Comment objects:", e);
+        }
+
+        return commentList;
     }
 
     @Override
     public void remove(Comment entity) {
+        Session session = null;
+        Transaction transaction = null;
+        try {
+            session = factory.openSession();
+            transaction = session.beginTransaction();
+
+            session.remove(entity);
 
+            transaction.commit();
+        } catch (Exception e) {
+            if (transaction != null) {
+                transaction.rollback();
+            }
+            throw new RuntimeException("Can't remove Comment object from database", e);
+        } finally {
+            if (session != null) {
+                session.close();
+            }
+        }
     }
 }
diff --git a/src/main/java/core/basesyntax/dao/impl/MessageDaoImpl.java b/src/main/java/core/basesyntax/dao/impl/MessageDaoImpl.java
@@ -3,7 +3,9 @@
 import core.basesyntax.dao.MessageDao;
 import core.basesyntax.model.Message;
 import java.util.List;
+import org.hibernate.Session;
 import org.hibernate.SessionFactory;
+import org.hibernate.Transaction;
 
 public class MessageDaoImpl extends AbstractDao implements MessageDao {
     public MessageDaoImpl(SessionFactory sessionFactory) {
@@ -12,21 +14,74 @@ public MessageDaoImpl(SessionFactory sessionFactory) {
 
     @Override
     public Message create(Message entity) {
-        return null;
+        Session session = null;
+        Transaction transaction = null;
+        try {
+            session = factory.openSession();
+            transaction = session.beginTransaction();
+
+            session.persist(entity);
+            transaction.commit();
+            return entity;
+
+        } catch (Exception e) {
+            if (transaction != null) {
+                transaction.rollback();
+            }
+            throw new RuntimeException("Can't add Message object in database", e);
+        } finally {
+            if (session != null) {
+                session.close();
+            }
+        }
     }
 
     @Override
     public Message get(Long id) {
-        return null;
+        Message message = null;
+
+        try (Session session = factory.openSession()) {
+            message = session.get(Message.class, id);
+        } catch (Exception e) {
+            throw new RuntimeException("Can't retrieve Message object by id:" + id, e);
+        }
+
+        return message;
     }
 
     @Override
     public List<Message> getAll() {
-        return null;
+        List<Message> messageList = null;
+
+        try (Session session = factory.openSession()) {
+            messageList = session.createQuery("FROM Message", Message.class).list();
+        } catch (Exception e) {
+            throw new RuntimeException("Can't retrieve all Comment objects:", e);
+        }
+
+        return messageList;
     }
 
     @Override
     public void remove(Message entity) {
+        Session session = null;
+        Transaction transaction = null;
+        try {
+            session = factory.openSession();
+            transaction = session.beginTransaction();
+
+            session.remove(entity);
 
+            transaction.commit();
+        } catch (Exception e) {
+            if (transaction != null) {
+                transaction.rollback();
+            }
+            throw new RuntimeException("Can't remove Message object from database", e);
+        } finally {
+            if (session != null) {
+                session.close();
+            }
+        }
     }
 }
diff --git a/src/main/java/core/basesyntax/dao/impl/MessageDetailsDaoImpl.java b/src/main/java/core/basesyntax/dao/impl/MessageDetailsDaoImpl.java
@@ -2,7 +2,9 @@
 
 import core.basesyntax.dao.MessageDetailsDao;
 import core.basesyntax.model.MessageDetails;
+import org.hibernate.Session;
 import org.hibernate.SessionFactory;
+import org.hibernate.Transaction;
 
 public class MessageDetailsDaoImpl extends AbstractDao implements MessageDetailsDao {
     public MessageDetailsDaoImpl(SessionFactory sessionFactory) {
@@ -11,11 +13,37 @@ public MessageDetailsDaoImpl(SessionFactory sessionFactory) {
 
     @Override
     public MessageDetails create(MessageDetails entity) {
-        return null;
+        Session session = null;
+        Transaction transaction = null;
+        try {
+            session = factory.openSession();
+            transaction = session.beginTransaction();
+
+            session.persist(entity);
+            transaction.commit();
+            return entity;
+
+        } catch (Exception e) {
+            if (transaction != null) {
+                transaction.rollback();
+            }
+            throw new RuntimeException("Can't add MessageDetails object in database", e);
+        } finally {
+            if (session != null) {
+                session.close();
+            }
+        }
     }
 
     @Override
     public MessageDetails get(Long id) {
-        return null;
+        MessageDetails messageDetails = null;
+
+        try (Session session = factory.openSession()) {
+            messageDetails = session.get(MessageDetails.class, id);
+        } catch (Exception e) {
+            throw new RuntimeException("Can't retrieve MessageDetails object by id:" + id, e);
+        }
+        return messageDetails;
     }
 }
diff --git a/src/main/java/core/basesyntax/dao/impl/SmileDaoImpl.java b/src/main/java/core/basesyntax/dao/impl/SmileDaoImpl.java
@@ -3,7 +3,9 @@
 import core.basesyntax.dao.SmileDao;
 import core.basesyntax.model.Smile;
 import java.util.List;
+import org.hibernate.Session;
 import org.hibernate.SessionFactory;
+import org.hibernate.Transaction;
 
 public class SmileDaoImpl extends AbstractDao implements SmileDao {
     public SmileDaoImpl(SessionFactory sessionFactory) {
@@ -12,16 +14,51 @@ public SmileDaoImpl(SessionFactory sessionFactory) {
 
     @Override
     public Smile create(Smile entity) {
-        return null;
+        Session session = null;
+        Transaction transaction = null;
+        try {
+            session = factory.openSession();
+            transaction = session.beginTransaction();
+
+            session.persist(entity);
+            transaction.commit();
+            return entity;
+
+        } catch (Exception e) {
+            if (transaction != null) {
+                transaction.rollback();
+            }
+            throw new RuntimeException("Can't add Smile object in database", e);
+        } finally {
+            if (session != null) {
+                session.close();
+            }
+        }
     }
 
     @Override
     public Smile get(Long id) {
-        return null;
+        Smile smile = null;
+
+        try (Session session = factory.openSession()) {
+            smile = session.get(Smile.class, id);
+        } catch (Exception e) {
+            throw new RuntimeException("Can't retrieve Smile object by id:" + id, e);
+        }
+
+        return smile;
     }
 
     @Override
     public List<Smile> getAll() {
-        return null;
+        List<Smile> smileList = null;
+
+        try (Session session = factory.openSession()) {
+            smileList = session.createQuery("FROM Smile", Smile.class).list();
+        } catch (Exception e) {
+            throw new RuntimeException("Can't retrieve all Smile objects:", e);
+        }
+
+        return smileList;
     }
 }
diff --git a/src/main/java/core/basesyntax/dao/impl/UserDaoImpl.java b/src/main/java/core/basesyntax/dao/impl/UserDaoImpl.java
@@ -3,7 +3,9 @@
 import core.basesyntax.dao.UserDao;
 import core.basesyntax.model.User;
 import java.util.List;
+import org.hibernate.Session;
 import org.hibernate.SessionFactory;
+import org.hibernate.Transaction;
 
 public class UserDaoImpl extends AbstractDao implements UserDao {
     public UserDaoImpl(SessionFactory sessionFactory) {
@@ -12,21 +14,74 @@ public UserDaoImpl(SessionFactory sessionFactory) {
 
     @Override
     public User create(User entity) {
-        return null;
+        Session session = null;
+        Transaction transaction = null;
+        try {
+            session = factory.openSession();
+            transaction = session.beginTransaction();
+
+            session.persist(entity);
+            transaction.commit();
+            return entity;
+
+        } catch (Exception e) {
+            if (transaction != null) {
+                transaction.rollback();
+            }
+            throw new RuntimeException("Can't add User object in database", e);
+        } finally {
+            if (session != null) {
+                session.close();
+            }
+        }
     }
 
     @Override
     public User get(Long id) {
-        return null;
+        User user = null;
+
+        try (Session session = factory.openSession()) {
+            user = session.get(User.class, id);
+        } catch (Exception e) {
+            throw new RuntimeException("Can't retrieve User object by id:" + id, e);
+        }
+
+        return user;
     }
 
     @Override
     public List<User> getAll() {
-        return null;
+        List<User> userList = null;
+
+        try (Session session = factory.openSession()) {
+            userList = session.createQuery("FROM User", User.class).list();
+        } catch (Exception e) {
+            throw new RuntimeException("Can't retrieve all User objects:", e);
+        }
+
+        return userList;
     }
 
     @Override
     public void remove(User entity) {
+        Session session = null;
+        Transaction transaction = null;
+        try {
+            session = factory.openSession();
+            transaction = session.beginTransaction();
+
+            session.remove(entity);
 
+            transaction.commit();
+        } catch (Exception e) {
+            if (transaction != null) {
+                transaction.rollback();
+            }
+            throw new RuntimeException("Can't remove User object from database", e);
+        } finally {
+            if (session != null) {
+                session.close();
+            }
+        }
     }
 }