hibernate - 使用 hibernate 返回计数值的查询

Question

这是我的 mysql 查询:

SELECT count(*) 
FROM bw_jobs 
WHERE year(job_date)=year(curdate()) AND month(job_date)=month(curdate());

如何在 hibernate 中使用它来获取计数值？

Answer 1

String hql = "select count(job.id) from Job job"
             + " where year(job.jobDate) = year(current_date())"
             + " and month(job.jobDate) = month(current_date())";
Query query = session.createQuery(hql);
return ((Number) query.uniqueResult()).intValue();

(假设bw_jobs表由Job实体映射，job_date列映射到jobDate属性)

见 http://docs.jboss.org/hibernate/core/3.6/reference/en-US/html_single/#queryhql-expressions获取 Hibernate 支持的功能列表。