Added PersistenceManager and Namedqueries
In theory, this code is all we need for database integration
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@ -4,6 +4,9 @@ import java.util.Date;
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import javax.persistence.Entity;
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import javax.persistence.Id;
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import javax.persistence.NamedQueries;
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import javax.persistence.NamedQuery;
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import javax.persistence.Table;
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import javax.persistence.Temporal;
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import javax.persistence.TemporalType;
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@ -23,6 +26,13 @@ import envoy.data.MessageBuilder;
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* @since Envoy Server Standalone v0.1-alpha
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*/
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@Entity
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@Table(name = "messages")
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@NamedQueries(
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{ @NamedQuery(query = "SELECT m FROM Message m WHERE m.recipient =:recipient AND m.state = 1", name = "getUnreadMessages"), @NamedQuery(
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query = "SELECT m FROM Message m WHERE m.sender =:sender AND m.state = :state",
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name = "find read messages"//TODO do we need this namedQuery?
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), @NamedQuery(query = "SELECT m FROM Message m WHERE m.id = :messageId", name = "get message") }//TODO do we need this namedQuery?
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)
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public class Message {
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@Id
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@ -7,6 +7,8 @@ import javax.persistence.Entity;
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import javax.persistence.GeneratedValue;
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import javax.persistence.GenerationType;
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import javax.persistence.Id;
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import javax.persistence.NamedQuery;
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import javax.persistence.Table;
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import javax.persistence.Temporal;
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import javax.persistence.TemporalType;
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@ -24,6 +26,8 @@ import javax.persistence.TemporalType;
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* @since Envoy Server Standalone v0.1-alpha
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*/
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@Entity
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@Table(name = "users")
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@NamedQuery(query = "SELECT u FROM DBUser u WHERE u.id = :id", name = "getUserById")
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public class User {
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@Id
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@ -1,21 +1,96 @@
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package envoy.server.database;
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import java.util.List;
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import javax.persistence.EntityManager;
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import javax.persistence.Persistence;
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import org.hibernate.Session;
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import envoy.server.data.Message;
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import envoy.server.data.User;
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/**
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* Project: <strong>envoy-server-standalone</strong><br>
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* File: <strong>PersistenceManager.java</strong><br>
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* Created: <strong>3 Jan 2020</strong><br>
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*
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* Created: <strong>1 Jan 2020</strong><br>
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*
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* @author Leon Hofmeister
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* @since Envoy Server Standalone v0.1-alpha
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*/
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public class PersistenceManager {
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private EntityManager entityManager = Persistence.createEntityManagerFactory("envoy").createEntityManager();
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/**
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*
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*
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* @since Envoy Server Standalone v0.1-alpha
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*/
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public PersistenceManager() { // TODO Auto-generated constructor stub
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public PersistenceManager() {
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/*
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* // TODO TESTING
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* User user = new User(3, "t");
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* User user2 = new User(2, "w");
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* Message msg = new MessageBuilder(user.getId(), user2.getId()).build();
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* entityManager.getTransaction().begin();
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* entityManager.persist(user);
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* entityManager.persist(user2);
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* entityManager.persist(msg);
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* entityManager.getTransaction().commit();
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*/ // TODO delete until here
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}
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}
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/**
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* Adds a user to the database.
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*
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* @param User the {@link User} to add to the database
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* @since Envoy Server Standalone v0.1-alpha
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*/
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public void addUser(User User) { entityManager.persist(User); }
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/**
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* Adds a message to the database.
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*
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* @param message the {@link Message} to add to the database
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* @since Envoy Server Standalone v0.1-alpha
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*/
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public void addMessage(Message message) { entityManager.persist(message); }// TODO these functions or the one below?
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/**
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* This is a delegate function for {@link EntityManager#persist} in order to add
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* an {@link User} / a {@link Message} into the database
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*
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* @param obj the object to add to the database
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* @since Envoy Server Standalone v0.1-alpha
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*/
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public void addObject(Object obj) { entityManager.persist(obj); }
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/**
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* Updates a row of database objects, either a Message or a User with new data.
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*
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* @param obj the object to update (existing User/Message)
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* @since Envoy Server Standalone v0.1-alpha
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*/
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public void updateObject(Object obj) { entityManager.unwrap(Session.class).merge(obj); }
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/**
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* Searches for a user with a specific id.
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*
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* @param id - the id to search for
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* @return the user with the specified id
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* @since Envoy Server Standalone v0.1-alpha
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*/
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public User getUserById(long id) { return (User) entityManager.createNamedQuery("getUserById").setParameter("id", id).getSingleResult(); }
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/**
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* Returns all messages received while being offline.
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*
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* @param user - the user who wants to receive his unread messages
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* @return all messages that the client does not yet have (unread messages)
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* @since Envoy Server Standalone v0.1-alpha
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*/
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@SuppressWarnings("unchecked")
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public List<Message> getUnreadMessages(User user) {// TODO may need to be changed to clientId
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return entityManager.createNamedQuery("getUnreadMessages").setParameter("recipient", user).getResultList();
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}
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}
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