[英]How do I create my query with Hibernate Criteria
我必須使用條件創建以下查詢:
SELECT r.*,(
SELECT COUNT(*) FROM APP.P_FORM_QUESTION_ANSWER qa
WHERE qa.J_STATUS = 'CORRECT'
AND qa.J_FORM_ID = r.J_FORM_ID AND qa.J_AUTHOR_ID = r.J_AUTHOR_ID
AND qa.J_FORM_RESULT_ID = r.J_ROW_ID
) as correctCount
FROM APP.P_FORM_RESULT r
WHERE r.J_FORM_ID = '123456'
ORDER BY correctCount DESC;
我嘗試將DetachedCriteria用於額外的列,但看不到如何表示:
"qa.J_FORM_ID = r.J_FORM_ID AND qa.J_AUTHOR_ID = r.J_AUTHOR_ID
AND qa.J_FORM_RESULT_ID = r.J_ROW_ID"
在DetachedCriteria中,然后將我的DetachedCriteria添加為新列
Criteria criteria =
HibernateUtil.getSession().createCriteria(FormResult.class, "formResult");
criteria.add(Restrictions.eq("formResult.formId", formId));
DetachedCriteria correctCount =
DetachedCriteria.forClass(QuestionAnswer.class, "questionAnswer");
correctCount.add(
Restrictions.eq("questionAnswer.status",QuestionAnswerStatus.CORRECT));
// How to retrieve 'formResult' ?
correctCount.add(Restrictions.eq("questionAnswer.formId", "formResult.formId"));
// How to retrieve 'formResult' ?
correctCount.add(Restrictions.eq("questionAnswer.authorId", "formResult.authorId"));
// How to retrieve 'formResult' ?
correctCount.add(
Restrictions.eq("questionAnswer.formResult.rowId", "formResult.rowId"));
correctCount.setProjection(Projections.rowCount());
// How to add my DetachedCriteria as a new column
criteria.setProjection(Projections.alias(correctCount, "correctCount"));
帶注釋的行是我找不到解決方案的行。
最后,我創建了一個不同的SQL查詢,該查詢提供了相同的結果:
SELECT r.J_ROW_ID, COUNT(DISTINCT qa.J_ROW_ID) as correctCount
FROM APP.P_FORM_RESULT r left join APP.P_FORM_QUESTION_ANSWER qa on qa.J_FORM_ID = r.J_FORM_ID AND qa.J_AUTHOR_ID = r.J_AUTHOR_ID AND qa.J_FORM_RESULT_ID = r.J_ROW_ID AND qa.J_STATUS = 'CORRECT'
WHERE r.J_FORM_ID = '123456'
GROUP BY r.J_ROW_ID
ORDER BY correctCount DESC;
我之所以使用HQL,是因為我無法在Criteria中找到方法:
// HQL Query to retrieve the list of FormResult IDs
StringBuilder hql = new StringBuilder();
hql.append("SELECT r.id");
hql.append(" FROM QuestionAnswer qa RIGHT JOIN qa.formResult as r");
hql.append(" WHERE r.formId = :formId AND (qa.status = :status OR qa.status IS NULL)");
hql.append(" GROUP BY r.id");
hql.append(" ORDER BY COUNT(DISTINCT qa.id) DESC"));
Query query = HibernateUtil.getSession().createQuery(hql.toString());
query.setParameter("formId", formId);
query.setParameter("status", QuestionAnswerStatus.CORRECT);
// Retrieve the list of FormResult objects from the list of IDs previously retrieved
List<Long> result = query.list();
if (result != null && !result.isEmpty()) {
for (Long resultId : result) {
formResults.add(getData(FormResult.class, resultId));
}
}
缺點是我必須從我的HQL查詢檢索到的ID列表中逐個檢索每個FormResult。
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