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 String deleteAllGroupUsers(Long usergroup_id) {
    String res = "deleteAllGroupUsers";
    try {
      Object idf = PersistenceSessionUtil.createSession();
      EntityManager session = PersistenceSessionUtil.getSession();
      EntityTransaction tx = session.getTransaction();
      tx.begin();
      String hqlUpdate = "delete users_usergroups where usergroup_id= :usergroup_id";
      int updatedEntities = session.createQuery(hqlUpdate).setParameter(
          "usergroup_id", usergroup_id.longValue()).executeUpdate();
      res = "Success" + updatedEntities;
      tx.commit();
      PersistenceSessionUtil.closeSession(idf);

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  public Users_Usergroups getGroupUsers(Long user_level, Long usergroup_id) {
    Users_Usergroups groups = new Users_Usergroups();
    if (checkUserLevel(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");
        query.setParameter("usergroup_id", usergroup_id.longValue());
        for (Iterator it2 = query.getResultList().iterator(); it2.hasNext();) {
          groups = (Users_Usergroups) it2.next();
        }

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  public Usergroups[] getUsergroupsUsers(Long usergroup_id) {
    Usergroups[] usergroups = new Usergroups[1];
    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");
      query.setParameter("usergroup_id", usergroup_id.longValue());
      int count = query.getResultList().size();
      usergroups = new Usergroups[count];
      int k = 0;

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  public Usergroups[] getAllGroupUsers(Long user_level) {
    Usergroups[] usergroups = 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("from Usergroups");
        int count = query.getResultList().size();
        usergroups = new Usergroups[count];
        int k = 0;
        for (Iterator it2 = query.getResultList().iterator(); it2.hasNext();) {
          usergroups[k] = (Usergroups) it2.next();

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  public Usergroups getGroup(Long usergroup_id) {
    Usergroups usergroups = new Usergroups();
    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");
      query.setParameter("usergroup_id", usergroup_id.longValue());
      for (Iterator it2 = query.getResultList().iterator(); it2.hasNext();) {
        usergroups = (Usergroups) it2.next();
      }

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  public Usergroups[] getAllGroup(Long user_level) {
    Usergroups[] usergroups = 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("from Usergroups");
        int count = query.getResultList().size();
        usergroups = new Usergroups[count];
        int k = 0;
        for (Iterator it2 = query.getResultList().iterator(); it2.hasNext();) {
          usergroups[k] = (Usergroups) it2.next();

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  public Users_Usergroups getSingleGroup(Long user_level, Long usergroup_id) {
    Users_Usergroups groups = new Users_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");
        query.setParameter("usergroup_id", usergroup_id.longValue());
        for (Iterator it2 = query.getResultList().iterator(); it2.hasNext();) {
          groups = (Users_Usergroups) it2.next();
        }

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      //        usergroups.setComment(comment);
      usergroups.setStarttime(new Date());
      usergroups.setUpdatetime(null);
      try {
        Object idf = PersistenceSessionUtil.createSession();
        EntityManager session = PersistenceSessionUtil.getSession();
        EntityTransaction tx = session.getTransaction();
        tx.begin();
        session.merge(usergroups);
        session.flush();
        session.refresh(usergroups);
        tx.commit();
        PersistenceSessionUtil.closeSession(idf);
      } catch (Exception ex2) {
        log.error("addGroup",ex2);
      }

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      Long usergroup_id, String name, String description, String comment) {
    String res = "UpdateGroup";
    if (checkUserLevel(user_level)) {
      try {
        Object idf = PersistenceSessionUtil.createSession();
        EntityManager session = PersistenceSessionUtil.getSession();
        EntityTransaction tx = session.getTransaction();
      tx.begin();
        String hqlUpdate = "update Usergroups set user_id = :user_id,level_id = :level_id, name = :name, description = :description, updatetime = :updatetime, comment = :comment where usergroup_id= :usergroup_id";
        int updatedEntities = session.createQuery(hqlUpdate).setParameter(
            "user_id", USER_ID.longValue()).setParameter("level_id",
            level_id.longValue()).setParameter("name", name)
            .setParameter("description", description).setParameter(
                "updatetime",
                new Long(-1))

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  public String deleteGroup(Long user_level, Long usergroup_id) {
    String res = "UpdateGroup";
    if (checkUserLevel(user_level)) {
      try {
        Object idf = PersistenceSessionUtil.createSession();
        EntityManager session = PersistenceSessionUtil.getSession();
        EntityTransaction tx = session.getTransaction();
      tx.begin();
        String hqlUpdate = "delete Usergroups where usergroup_id= :usergroup_id";
        int updatedEntities = session.createQuery(hqlUpdate).setParameter(
            "usergroup_id", usergroup_id.longValue())
            .executeUpdate();
        res = "Success" + updatedEntities;
        tx.commit();
        PersistenceSessionUtil.closeSession(idf);

View Full Code Here

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