Hibernate Criteria Api子查詢

Question

我目前正在開發一個項目，將一些遺留的jdbc select語句轉移到使用Hibernate及其標准api。

兩個相關的表列和SQL查詢如下所示：

-QUERIES-
primaryId

-QUERYDETAILS-
primaryId
linkedQueryId -> Foreign key references queries.primaryId
value1
value2

select * 
from queries q 
where q.primaryId not in (SELECT qd.linkedQueryId 
                          FROM querydetails qd 
                          WHERE (qd.value1 LIKE 'PROMPT%' 
                                 OR qd.value2 LIKE 'PROMPT%'));

我的實體關系如下：

@Table("queries")
public class QueryEntity{

    @Id
    @Column
    private Long primaryId;
    @OneToMany(targetEntity = QueryDetailEntity.class, mappedBy = "query", fetch = FetchType.EAGER)
    private Set<QueryDetailEntities> queryDetails;

    //..getters/setters..

}

@Entity
@Table(name = "queryDetails")
public class QueryDetailEntity {
    @Id
    @Column
    private Long primaryId;

    @ManyToOne(targetEntity = QueryEntity.class)
    private QueryEntity query;

@Column(name="value1")
private String value1;

@Column(name="value2")
private String value2;

    //..getters/setters..

}

我試圖以這種方式使用標准api：

Criteria crit = sessionFactory.getCurrentSession().createCriteria(QueryEntity.class);

DetachedCriteria subQuery = DetachedCriteria.forClass(QueryDetailEntity.class);
LogicalExpression hasPrompt = Restrictions.or(Restrictions.ilike("value1", "PROMPT%"),
        Restrictions.ilike("value2", "PROMPT%"));
subQuery.add(hasPrompt);
Criterion subQueryCrit = Subqueries.notIn("queryDetails", subQuery);
crit.add(subQueryCrit);

List<QueryMainEntity> entities = (List<QueryMainEntity>) crit.list();
System.out.println("# of results = " + entities.size());

我在看起來像的crit.list（）行上得到一個NullPointerException

Exception in thread "main" java.lang.NullPointerException
    at org.hibernate.loader.criteria.CriteriaQueryTranslator.getProjectedTypes(CriteriaQueryTranslator.java:362)
    at org.hibernate.criterion.SubqueryExpression.createAndSetInnerQuery(SubqueryExpression.java:153)
    at org.hibernate.criterion.SubqueryExpression.toSqlString(SubqueryExpression.java:69)
    at org.hibernate.loader.criteria.CriteriaQueryTranslator.getWhereCondition(CriteriaQueryTranslator.java:380)
    at org.hibernate.loader.criteria.CriteriaJoinWalker.<init>(CriteriaJoinWalker.java:114)
    at org.hibernate.loader.criteria.CriteriaJoinWalker.<init>(CriteriaJoinWalker.java:83)
    at org.hibernate.loader.criteria.CriteriaLoader.<init>(CriteriaLoader.java:92)
    at org.hibernate.impl.SessionImpl.list(SessionImpl.java:1687)
    at org.hibernate.impl.CriteriaImpl.list(CriteriaImpl.java:347)

現在，我認為可以肯定地說我正在使用Criteria Api / Detached Query Api，但是我不確定“正確”的方法是什么，因為Hibernate Docs只是簡單地涵蓋了api子查詢的標准。

我意識到這是一個很長的問題，但我認為它似乎把問題的所有相關方面（查詢我試圖通過Criteria API，表，實體來表示）。

Answer 1

試一試：

DetachedCriteria d = DetachedCriteria.forClass(QueryDetailEntity.class, "qd");
d.setProjection(Projections.projectionList().add(Projections.property("qd.query")));
d.add(Restrictions.or(Restrictions.like("qd.value1", "PROMPT%"), Restrictions.like("qd.value2", "PROMPT%")));

criteria = session.createCriteria(QueryEntity.class, "q");
criteria.add(Subqueries.propertyNotIn("q.primaryId", d));
criteria.list();

以下是屬性名稱，而不是列名：

qd.query
qd.value1
qd.value2
q.primaryId

作為旁注，如果這不是動態生成的查詢，您是否考慮過使用HQL？