Java HQL SELECT子句不起作用
我有一个实体叫做CategorySetJava HQL SELECT子句不起作用,java,sql,hibernate,hql,criteria,Java,Sql,Hibernate,Hql,Criteria,我有一个实体叫做CategorySet @Entity @Table(name = "CATEGORY_SET") public class CategorySet { @Id @Column(name = "ID") @GeneratedValue private Integer id; @OneToOne @JoinColumn(name = "ID") private Category parent; @OneToOne @JoinColumn(name
@Entity
@Table(name = "CATEGORY_SET")
public class CategorySet {
@Id
@Column(name = "ID")
@GeneratedValue
private Integer id;
@OneToOne
@JoinColumn(name = "ID")
private Category parent;
@OneToOne
@JoinColumn(name = "ID")
private Category child;
public CategorySet(Category parent, Category child) {
this.parent = parent;
this.child = child;
}
public CategorySet() {
}
}
在我的DaoImpl中,我从实体中获取唯一的子列。
但它正在返回空列表
String innerQueryString = "select CS.child FROM CategorySet CS";
Query innerQuery = sessionFactory.getCurrentSession().createQuery(innerQueryString);
List list = innerQuery.list();
我也使用了标准。它抛出ArrayIndexOutOfBoundException
Criteria criteria =sessionFactory.getCurrentSession().createCriteria(CategorySet.class);
criteria.setProjection(Projections.property("child")); //Projections.property is used to retrieve specific columns
List students = criteria.list();
有人能帮我解决这个问题吗?家长和孩子联合栏目解决了这个问题
@Entity
@Table(name = "CATEGORY_SET")
public class CategorySet {
@Id
@Column(name = "ID")
@GeneratedValue
private Integer id;
@OneToOne
@JoinColumn(name = "PARENT")
private Category parent;
@OneToOne
@JoinColumn(name = "CHILD")
private Category child;
public CategorySet(Category parent, Category child) {
this.parent = parent;
this.child = child;
}
public CategorySet() {
}
}