Examples of javax.persistence.EntityManager

javax.persistence.EntityManager
Interface used to interact with the persistence context. An EntityManager instance is associated with a persistence context. A persistence context is a set of entity instances in which for any persistent entity identity there is a unique entity instance. Within the persistence context, the entity instances and their lifecycle are managed. This interface defines the methods that are used to interact with the persistence context. The EntityManager API is used to create and remove persistent entity instances, to find entities by their primary key, and to query over entities. The set of entities that can be managed by a given EntityManager instance is defined by a persistence unit. A persistence unit defines the set of all classes that are related or grouped by the application, and which must be colocated in their mapping to a single database. @author Emmanuel Bernard

  public Usergroups[] getAllGroupFree(Long user_level) {
    Usergroups[] groups = new Usergroups[1];
    if (checkConfLevel(user_level)) {
      try {
        Object idf = PersistenceSessionUtil.createSession();
        EntityManager session = PersistenceSessionUtil.getSession();
        EntityTransaction tx = session.getTransaction();
      tx.begin();
        Query query = session
            .createQuery("select c from usergroup_id as c where c.level_id = :level_id");
        query.setParameter("level_id", 1);
        int count = query.getResultList().size();
        groups = new Usergroups[count];
        int k = 0;

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  public Usergroups getSingleGroupFree(Long user_level, Long usergroup_id) {
    Usergroups groups = new Usergroups();
    if (checkConfLevel(user_level)) {
      try {
        Object idf = PersistenceSessionUtil.createSession();
        EntityManager session = PersistenceSessionUtil.getSession();
        EntityTransaction tx = session.getTransaction();
      tx.begin();
        Query query = session
            .createQuery("select c from Usergroups as c where c.usergroup_id = :usergroup_id AND c.level_id = :level_id");
        query.setParameter("usergroup_id", usergroup_id.longValue());
        query.setParameter("level_id", 1);
        for (Iterator it2 = query.getResultList().iterator(); it2.hasNext();) {
          groups = (Usergroups) it2.next();

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   */
  public Users getUser(Long user_id) {
    if (user_id != null && user_id > 0) {
      try {
        Object idf = PersistenceSessionUtil.createSession();
        EntityManager session = PersistenceSessionUtil.getSession();
        EntityTransaction tx = session.getTransaction();
      tx.begin();
        Query query = session.createQuery("select c from Users as c where c.user_id = :user_id");
        query.setParameter("user_id", user_id);
        
        session.flush();
        
        Users users = null;
        try {
          users = (Users) query.getSingleResult();
          } catch (NoResultException ex) {
          }
        session.refresh(users);
        
        tx.commit();
        PersistenceSessionUtil.closeSession(idf);
        
        //Somehow the Organizations are missing here o

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  public void updateUser(Users user) {
    if (user.getUser_id() > 0) {
      try {
        Object idf = PersistenceSessionUtil.createSession();
        EntityManager session = PersistenceSessionUtil.getSession();
        EntityTransaction tx = session.getTransaction();
        tx.begin();
        session.flush();
        if (user.getUser_id() == null) {
          session.persist(user);
            } else {
              if (!session.contains(user)) {
                session.merge(user);
            }
        }
        tx.commit();
        PersistenceSessionUtil.closeSession(idf);
      } catch (Exception ex2) {

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        // result +=
        // Groupmanagement.getInstance().deleteUserFromAllGroups(new
        // Long(USER_ID));


        Object idf = PersistenceSessionUtil.createSession();
        EntityManager session = PersistenceSessionUtil.getSession();
        EntityTransaction tx = session.getTransaction();
        tx.begin();
        if (us.getUser_id() == null) {
          session.persist(us);
            } else {
              if (!session.contains(us)) {
                session.merge(us);
            }
        }
        tx.commit();
        
        PersistenceSessionUtil.closeSession(idf);

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   */
  public Long selectMaxFromUsers(){
    try {
      //get all users
      Object idf = PersistenceSessionUtil.createSession();
      EntityManager session = PersistenceSessionUtil.getSession();
      EntityTransaction tx = session.getTransaction();
      tx.begin();
      Query query = session.createQuery("select count(c.user_id) from Users c where c.deleted = 'false'"); 
      List ll = query.getResultList();
      tx.commit();
      PersistenceSessionUtil.closeSession(idf);
      log.info("selectMaxFromUsers"+(Long)ll.get(0));
      return (Long)ll.get(0);

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  public List<Users> getAllUsers(){
    try {
      
      //get all users
      Object idf = PersistenceSessionUtil.createSession();
      EntityManager session = PersistenceSessionUtil.getSession();
      EntityTransaction tx = session.getTransaction();
      tx.begin();
      CriteriaBuilder cb = session.getCriteriaBuilder();
      CriteriaQuery<Users> cq = cb.createQuery(Users.class);
      Root<Users> c = cq.from(Users.class);
      Predicate condition = cb.equal(c.get("deleted"), "false");
      cq.where(condition);
      TypedQuery<Users> q = session.createQuery(cq);
      List<Users> ll = q.getResultList();
      tx.commit();
      PersistenceSessionUtil.closeSession(idf);
      
      return ll;

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  public List<Users> getAllUsersDeleted(){
    try {
      
      //get all users
      Object idf = PersistenceSessionUtil.createSession();
      EntityManager session = PersistenceSessionUtil.getSession();
      EntityTransaction tx = session.getTransaction();
      tx.begin();
      CriteriaBuilder cb = session.getCriteriaBuilder();
      CriteriaQuery<Users> cq = cb.createQuery(Users.class);
      Root<Users> c = cq.from(Users.class);
      Predicate condition = cb.equal(c.get("deleted"), "false");
      cq.where(condition);
      TypedQuery<Users> q = session.createQuery(cq);
      List<Users> ll = q.getResultList();
      tx.commit();
      PersistenceSessionUtil.closeSession(idf);
      
      return ll;

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      hql += " )" ;
      
      log.debug("Show HQL: "+hql);            
      
      Object idf = PersistenceSessionUtil.createSession();
      EntityManager session = PersistenceSessionUtil.getSession();
      EntityTransaction tx = session.getTransaction();
      tx.begin();
      Query query = session.createQuery(hql);
      
      //log.debug("id: "+folderId);
      
      //query.setParameter("macomUserId", userId);
      //query.setParameter("messageFolder", folderId);

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   * @return
   */
  public boolean checkUserLogin(String DataValue) {
    try {
      Object idf = PersistenceSessionUtil.createSession();
      EntityManager session = PersistenceSessionUtil.getSession();
      EntityTransaction tx = session.getTransaction();
      tx.begin();
      Query query = session.createQuery("select c from Users as c where c.login = :DataValue AND c.deleted <> :deleted");
      query.setParameter("DataValue", DataValue);
      query.setParameter("deleted", "true");
      int count = query.getResultList().size();


      tx.commit();

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