[英]Convert mysql query to JPQL query
我如何在JPQL中声明以下mysql查询
select * from Price WHERE `valueDate` = (SELECT MAX(`valueDate`) FROM Price) and fundId = 2930
我尝试过的是以下内容:
"select a from Price a where a.valueDate = select MAX(a.valueDate) and a.fund.id = :" +Price.QUERY_PARAM_FUND_ID
但是在这种方法上会出错:
Caused by: <openjpa-2.3.0-r422266:1540826 nonfatal user error> org.apache.openjpa.persistence.ArgumentException: "Encountered "MAX" at character 50, but expected: ["AND", "GROUP", "HAVING", "OR", "ORDER", <EOF>]." while parsing JPQL "select a from Price a where a.valueDate = select MAX(b.valueDate) from Price b and a.fund.id = :fundId"
我认为,如果您要在子查询之前和之后添加括号,它将可以工作。
“从Price a中选择一个,其中a.valueDate =(从Price中选择MAX(a.valueDate))和a.fund.id =:“ + Price.QUERY_PARAM_FUND_ID
否则,我要说一些与JPA规范的休眠实现有关的事情。 如果您有一个名为“价格”的Hibernate模型,那么您将通过该模型进行查询。 HQL将像这样
try {
final StringBuilder qry = new StringBuilder();
qry.append(" SELECT")
.append(" FROM Price p")
.append(" WHERE p.valueDate = (SELECT MAX(pr.valueDate) FROM Price pr)")
.append(" AND p.fundId = :fundId");
return getJpaTemplate().execute(new JpaCallback() {
public Object doInJpa(EntityManager em)
throws PersistenceException {
Query q = em.createQuery(qry.toString());
q.setParameter("fundId", fundId);
return q.getResultList();
}
});
} catch (RuntimeException re) {}
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