使用条件api查询具有多个连接的实体类

Question

如何使用docid列值选择此表中的行，并检索约会表中的值以及患者表中的某些值。查询应该在条件API中。 实体类如下，有两个连接。

@Entity
@Table(name="APPOINTMENT")
public class Appintment implements Serializable {
    private static final long serialVersionUID = 1L;

    @Id
    @Column(unique=true, nullable=false, length=20)
    private String appid;

    @Temporal(TemporalType.DATE)
    @Column(name="APP_DATE", nullable=false)
    private Date appDate;

    //bi-directional many-to-one association to Doctors
    @ManyToOne
    @JoinColumn(name="DOCID", nullable=false)
    private Doctor doctor;

   //bi-directional many-to-one association to Patients
   @ManyToOne
   @JoinColumn(name="USERID", nullable=false)
       private Patient patient;

}