public void initialize(Serializable key, SessionImplementor session) throws HibernateException {
LOG.debugf("Initializing collection: %s using named query: %s", persister.getRole(), queryName);
// TODO: is there a more elegant way than downcasting?
AbstractQueryImpl query = (AbstractQueryImpl) session.getNamedSQLQuery(queryName);
if (query.getNamedParameters().length > 0) {
query.setParameter(query.getNamedParameters()[0], key, persister.getKeyType());
} else {
query.setParameter(0, key, persister.getKeyType());
}
query.setCollectionKey(key).setFlushMode(FlushMode.MANUAL).list();
}
/**
* 根据分页请求参数与Query获取分页请求对象
*
* @param request 分页请求参数对象
* @param query Hibernate Query
* @return {@link Page}
*/
public <X> Page<X> findPage(PageRequest request, Query query) {
Page<X> page = new Page<X>(request);
if (request == null) {
return page;
}
AbstractQueryImpl impl = (AbstractQueryImpl) query;
String queryString = setPageRequestToHql(impl.getQueryString(), request);
ReflectionUtils.setFieldValue(impl, "queryString", queryString);
if (request.isCountTotal()) {
long totalCount = 0;
if (impl.hasNamedParameters()) {
Map<String, TypedValue> map = ReflectionUtils.getFieldValue(impl, "namedParameters");
Map<String, Object> values = new HashMap<String, Object>();
for (Map.Entry<String, TypedValue> entry : map.entrySet()) {
values.put(entry.getKey(), entry.getValue().getValue());
}
totalCount = countHqlResult(impl.getQueryString(), values);
} else {
List<Object> values = ReflectionUtils.invokeGetter(impl, "values");
totalCount = countHqlResult(impl.getQueryString(), values.toArray());
}
page.setTotalItems(totalCount);
}
impl.setFirstResult(request.getOffset());
impl.setMaxResults(request.getPageSize());
List result = impl.list();
page.setResult(result);
return page;
}
private int countGeneratedParameters(Query query) {
AbstractQueryImpl hqlQueryImpl = (AbstractQueryImpl) query;
return hqlQueryImpl.getParameterMetadata().getNamedParameterNames().size();
}