Examples of org.springframework.orm.jpa.JpaCallback

org.springframework.orm.jpa.JpaCallback
Callback interface for JPA code. To be used with {@link JpaTemplate}'s execution method, often as anonymous classes within a method implementation. A typical implementation will call EntityManager.find/merge to perform some operations on persistent objects. @author Juergen Hoeller @since 2.0 @see org.springframework.orm.jpa.JpaTemplate @see org.springframework.orm.jpa.JpaTransactionManager

    });
  }


  @Transactional
  public void flush() {
    getJpaTemplate().execute(new JpaCallback() {
      public Object doInJpa(EntityManager entityManager)
          throws PersistenceException {
        entityManager.flush();
        return null;
      }

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  }


  
  public int count() {
    logger.debug("count() called");
    return (Integer) getJpaTemplate().execute(new JpaCallback() {


      public Object doInJpa(EntityManager em) throws PersistenceException {
        Query query = createCountQuery(em);
        prepareQueryHintsIfNeeded(query);
        Number count = (Number) query.getSingleResult();

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      sQuery = "SELECT instance FROM " + entityName + " instance";
    } else {
      sQuery =  "SELECT " + newSelectStatement + " FROM " + entityName + " o";
    }
    final String fQuery = sQuery; 
    return (List<T>) getJpaTemplate().execute(new JpaCallback() {
      public Object doInJpa(EntityManager em) throws PersistenceException {
        Query query = em.createQuery(fQuery);
        prepareQueryHintsIfNeeded(query);
        return query.getResultList();
      }});

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  private int executeCountQuery(final Group group,
      final String squery, final Criterion... criteria) {
    try {
      return (Integer) this.getJpaTemplate().execute(new JpaCallback() {
        public Object doInJpa(EntityManager em)
            throws PersistenceException {
          Query query = em.createQuery(squery.toString());
          if (criteria != null) {
            GenericDaoUtils.addGroupParams(query, group, null);

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  @SuppressWarnings("unchecked")
  private List executeQueryWithJPA(final Criterion[] criteria,
      final int startPosition, final int maxResult, final Group group,
      final String sQuery) {
    try {
      return (List) this.getJpaTemplate().execute(new JpaCallback() {
        public Object doInJpa(EntityManager em)
            throws PersistenceException {
          Query query = em.createQuery(sQuery);
          if (criteria != null) {
            GenericDaoUtils.addGroupParams(query, group, null);

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  }




  public Object executeFinder(final Method method, final Object[] queryArgs) {
    final String queryName = queryNameFromMethodName(method.getName());
    return getJpaTemplate().execute(new JpaCallback() {


      public Object doInJpa(EntityManager em) throws PersistenceException {
        Query query = em.createNamedQuery(queryName);
        int index = 1;
        for (Object arg : queryArgs) {

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    });
  }


    public Object executeDelete(final Method method, final Object[] queryArgs) {
        final String queryName = queryNameFromMethodName(method.getName());
        return getJpaTemplate().execute(new JpaCallback() {


            public Object doInJpa(EntityManager em) throws PersistenceException {
                Query query = em.createNamedQuery(queryName);
                int index = 1;
                for (Object arg : queryArgs) {

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    }


    public Object executeUpdate(final Method method, final Object[] queryArgs) {
        final String methodName = method.getName();
        final String queryName = queryNameFromMethodName(methodName);
        return getJpaTemplate().execute(new JpaCallback() {
            public Object doInJpa(EntityManager em) throws PersistenceException {
                Query query = em.createNamedQuery(queryName);
                int index = 0;
                
                for (Object arg : queryArgs) {

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  @SuppressWarnings("unchecked")
  private T doReadPopulated(final PK id) {
    final String queryName = getEntityName()
        + ".readPopulated";
    return (T) getJpaTemplate().execute(new JpaCallback() {
      public Object doInJpa(EntityManager em) throws PersistenceException {
        Query query = em.createNamedQuery(queryName);
        query.setParameter(1, id);
        return query.getSingleResult();
      }

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    return getEntityName() + "." + finderMethod;
  }


  @Transactional
  public void delete(final T entity) {
    getJpaTemplate().execute(new JpaCallback() {
      public Object doInJpa(EntityManager entityManager) throws PersistenceException {
        T managedEntity = entity;
        if (!entityManager.contains(managedEntity)) {
          managedEntity = entityManager.merge(entity);
        }

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