How to use

delete

method

in

org.springframework.data.jpa.repository.support.SimpleJpaRepository

@Transactional
@Override
public void deleteAll(Iterable<? extends T> entities) {
  Assert.notNull(entities, "The given Iterable of entities not be null!");
  for (T entity : entities) {
    delete(entity);
  }
}

@Transactional
@Override
public void deleteAll() {
  for (T element : findAll()) {
    delete(element);
  }
}

@Transactional
@Override
public void deleteById(ID id) {
  Assert.notNull(id, ID_MUST_NOT_BE_NULL);
  delete(findById(id).orElseThrow(() -> new EmptyResultDataAccessException(
      String.format("No %s entity with id %s exists!", entityInformation.getJavaType(), id), 1)));
}

@Override
public void delete(ID id) {
 delegate.delete(id);
}

@Override
public void delete(Iterable<? extends T> entities) {
 delegate.delete(entities);
}

@Override
public void delete(T entity) {
 delegate.delete(entity);
}

/**
 * 数据删除操作
 *
 * @param entity 待操作数据
 */
@Transactional
public void delete(T entity) {
  jpaRepository.delete(entity);
}

@Transactional
public void deleteAll(Iterable<? extends T> entities) {
  Assert.notNull(entities, "The given Iterable of entities not be null!");
  for (T entity : entities) {
    delete(entity);
  }
}

@Transactional
public void deleteAll() {
  for (T element : findAll()) {
    delete(element);
  }
}

  @Override
  @Transactional
  public void delete(final I id) {
    findOne(id);
    super.delete(id);
  }
}

@Override
@Transactional
public void deleteByCode(String code) {
  super.delete(getByCode(code));
  entityManager.flush();
}

@Override
@Transactional
public void deleteById(long id) {
  super.delete(getById(id));
  entityManager.flush();
}

@Transactional
public void deleteById(ID id) {
  Assert.notNull(id, ID_MUST_NOT_BE_NULL);
  delete(findById(id).orElseThrow(() -> new EmptyResultDataAccessException(
      String.format("No %s entity with id %s exists!", entityInformation.getJavaType(), id), 1)));
}

/**
 * 删除实体
 *
 * @param entity 实体
 */
@Transactional
@Override
public void delete(final M entity) {
  if (entity == null) {
    return;
  }
  if (entity instanceof DeletedRecordable) {
    ((DeletedRecordable) entity).setDeleted(Boolean.TRUE);
    save(entity);
  } else {
    super.delete(entity);
  }
}

  /**
   * 数据删除操作
   *
   * @param entity 待操作数据
   */
  @Transactional
  @Override
  public void delete(T entity) {
    Validation.isTrue(!entity.hasChildren(), "只允许删除子节点");

    //记录删除对象的左右值
    Integer left = entity.getLft();
    Integer right = entity.getRgt();

    //先删除当前对象
    jpaRepository.delete(entity);
    entityManager.flush();

    //删除节点后，移动右侧节点。注意此算法需要确保已递归删除所有子节点，如果出现孤儿节点情况则会有问题。
    int width = right - left + 1;
    Query update1 = entityManager.createQuery("update " + entityName + " set rgt = rgt - :width where rgt > :rightParam");
    Query update2 = entityManager.createQuery("update " + entityName + " set lft = lft - :width where lft > :rightParam");
    update1.setParameter("rightParam", right);
    update2.setParameter("rightParam", right);
    update1.setParameter("width", width);
    update2.setParameter("width", width);
    int cnt1 = update1.executeUpdate();
    int cnt2 = update2.executeUpdate();
  }
}

@Override
@Transactional
public void delete(T entity) {
  for (OrmDeleteInterceptor<T,JpaSupportRepository<T, ID>> interceptor : deleteInterceptors) {
    ID id = ReflectionUtils.invokeGetterMethod(entity, getIdName());
    if (!interceptor.onDelete(id, entity, this)) {
      return ;
    }
  }
  
  super.delete(entity);
  
  for (OrmDeleteInterceptor<T,JpaSupportRepository<T, ID>> interceptor : deleteInterceptors) {
    ID id = ReflectionUtils.invokeGetterMethod(entity, getIdName());
    interceptor.onPostDelete(id, entity, this);
  }
  
}