java - Hibernate Criteria Api 子查询

Question

我目前正在开展一个项目，将一些遗留的 jdbc select 语句转移到使用 Hibernate 及其标准 api。

两个相关的表列和 SQL 查询如下所示:

-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%'));

我的实体关系如下:

@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..

}

我正在尝试以这种方式使用标准 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 crit.list() 行上得到一个 NullPointerException 看起来像

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)

现在，我认为可以肯定地说我错误地使用了 Criteria Api/Detached Query Api，但我不确定自 Hibernate Docs 以来“正确”的方法是什么仅简要介绍 criteria api 子查询。

我意识到这是一个很长的问题，但我认为它似乎涵盖了问题的所有相关方面(我试图通过 Criteria API、表、实体表示的查询)。

Answer 1

试一试:

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();

以下使用的是属性名，不是列名:

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

附带说明一下，如果这不是动态生成的查询，您是否考虑过改用 HQL？