私は休止状態の 3.5.4-final を使用しています。私は2つのJPAクラスを持っています。
@Entity
@Table(name = "SPI_V_OP_OBJ_SUBJECT_VR")
public class OpSubject_vr extends PersistenceEntity implements Serializable {
private static final long serialVersionUID = 1858749317461707015L;
/** id */
@Id
@GeneratedValue(strategy = GenerationType.AUTO)
@Column(name = "ID",
nullable = false)
private Long id;
/** name */
@Column(name = "F_NAME")
private String f_name;
/** type */
@Column(name = "SUBJECT_TYPE")
private String subject_type;
/** okved */
@ManyToMany
@JoinTable(name = "SPI_V_OP_OBJ_SUBJECT_VR_OKVED",
joinColumns = {@JoinColumn(name = "OBJECT_ID",
referencedColumnName = "ID",
nullable = false)},
inverseJoinColumns = {@JoinColumn(name = "SPR_ID",
referencedColumnName = "ID",
nullable = false)})
private List<OpSprOkved> okved_id_mult = new ArrayList<>();
}
と
@Entity
@Table(name = "SPI_V_OP_SPR_OKVED")
public class OpSprOkved extends PersistenceEntity implements Serializable {
/** id */
@Id
@Column(name = "ID", nullable = false)
private Long id;
/** code*/
@Column(name = "CODE")
private String code;
/** name*/
@Column(name = "name")
private String name;
}
属性 okved_id_mult は複数です。空の属性 okved_id_mult を持つオブジェクト OpSubject_vr を選択したいと考えています。
私は試した
select ent from OpSubject_vr ent where okved_id_mult is empty; (hibernate error)
select ent from OpSubject_vr ent where okved_id_mult is null; (hibernate error)
select distinct ent from OpSubject_vr ent join ent.okved_id_mult i1 where i1.code is null;(return 0 objects)