如何连接两个表并重复进入休眠状态

Question

如何编写hibernate查询以获取在jdbc中执行的mysql查询中执行的下列列表。如何写HQL查询我的主类，请让我知道

母实体

@Entity 
@Table(name = "parent_info") 
public class ParentDTO { 
    @Id 
    @GenericGenerator(name = "j", strategy = "increment") 
    @GeneratedValue(generator = "j") 
    @Column(name = "P_ID") 
    private int p_id; 

    @Column(name = "P_NAME") 
    private String p_name; 

    @Column(name = "P_PHONE") 
    private String p_phone; 

    @Column(name = "P_EMAIL") 
    private String p_email; 

    @Column(name = "REF_ID") 
    private String ref_id; 

    @OneToMany(cascade={CascadeType.ALL}) 
    @JoinColumn(name="student_id") 

    private List<StudentDTO> students; 


    public List<StudentDTO> getStudents() { 
     return students; 
    } 

    public void setStudents(List<StudentDTO> students) { 
     this.students = students; 
    } 

    public int getP_id() { 
     return p_id; 
    } 

    public void setP_id(int p_id) { 
     this.p_id = p_id; 
    } 

    public String getP_name() { 
     return p_name; 
    } 

    public void setP_name(String p_name) { 
     this.p_name = p_name; 
    } 

    public String getP_phone() { 
     return p_phone; 
    } 

    public void setP_phone(String p_phone) { 
     this.p_phone = p_phone; 
    } 

    public String getP_email() { 
     return p_email; 
    } 

    public void setP_email(String p_email) { 
     this.p_email = p_email; 
    } 

    public String getRef_id() { 
     return ref_id; 
    } 

    public void setRef_id(String ref_id) { 
     this.ref_id = ref_id; 
    } 


} 

学生实体类

@Entity 
@Table(name = "student_info") 
public class StudentDTO { 
    @Id 
    @GenericGenerator(name = "j", strategy = "increment") 
    @GeneratedValue(generator = "j") 
    @Column(name = "S_ID") 
    private int s_id; 

    @Column(name = "S_NAME") 
    private String s_name; 

    @Column(name = "S_PHONE") 
    private String s_phone; 

    @Column(name = "S_EMAIL") 
    private String s_email; 

    @Column(name = "REF_ID") 
    private String ref_id; 

    @Column(name = "S_CLASS_NAME") 
    private String s_class_name; 



    @ManyToOne 
    @JoinColumn(name="parent_id") 
    private ParentDTO parent; 




    public ParentDTO getParent() { 
     return parent; 
    } 

    public void setParent(ParentDTO parent) { 
     this.parent = parent; 
    } 

    public int getS_id() { 
     return s_id; 
    } 

    public void setS_id(int s_id) { 
     this.s_id = s_id; 
    } 

    public String getS_name() { 
     return s_name; 
    } 

    public void setS_name(String s_name) { 
     this.s_name = s_name; 
    } 

    public String getS_phone() { 
     return s_phone; 
    } 

    public void setS_phone(String s_phone) { 
     this.s_phone = s_phone; 
    } 

    public String getS_email() { 
     return s_email; 
    } 

    public void setS_email(String s_email) { 
     this.s_email = s_email; 
    } 

    public String getRef_id() { 
     return ref_id; 
    } 

    public void setRef_id(String ref_id) { 
     this.ref_id = ref_id; 
    } 

    public String getS_class_name() { 
     return s_class_name; 
    } 

    public void setS_class_name(String s_class_name) { 
     this.s_class_name = s_class_name; 
    } 

} 

主类

public class Test { 

    public static void main(String[] args) { 
     Session session = null; 
     Transaction tx = null; 
     List<StudentDTO> groupList = null; 
     try { 
      SessionFactory sessionFactory = HibernateUtil.getSessionFactory(); 
      session = sessionFactory.openSession(); 
      session.beginTransaction(); 


      session.getTransaction().commit(); 
     } catch (Exception e) { 
      System.out.println(e.getMessage()); 
     } finally { 
      session.close(); 
     } 
    } 
} 

在JDBC

执行

我的SQL查询选择pt.P_MOBILE，pt.P_EMAIL，st.S_FIRSTNAME，st.REF_ID从parent_info PT加入student_info ST上pt.REF_ID = st.REF_ID其中st.S_CLASS_TO_JOIN = 10 ;

Answer 1

String query="paste your query here "; 
List<Object[]> objects = session.createSQLQuery(query).list(); 
       ListIterator<Object[]> iterator = objects.listIterator(); 
       while (iterator.hasNext()) { 
        Object[] object = (Object[]) iterator.next(); 

        int firstcolumn=(Integer) object[0]; 
        int secondcolumn=(Integer) object[1]; 

        }