QBC Hibernate 多表查询

1.java 实体对象

 

 

package com.helloworld.domain;
// Generated 2012-3-7 18:14:29 by Hibernate Tools 3.2.1.GA



/**
 * TbAccount generated by hbm2java
 * @author  liuqing
 */
public class TbAccount  implements java.io.Serializable {


     private Integer id;
     private TbPerson tbPerson;
     private String name;

    public TbAccount() {
    }

    public TbAccount(TbPerson tbPerson, String name) {
       this.tbPerson = tbPerson;
       this.name = name;
    }
   
    public Integer getId() {
        return this.id;
    }
    
    public void setId(Integer id) {
        this.id = id;
    }
    public TbPerson getTbPerson() {
        return this.tbPerson;
    }
    
    public void setTbPerson(TbPerson tbPerson) {
        this.tbPerson = tbPerson;
    }
    public String getName() {
        return this.name;
    }
    
    public void setName(String name) {
        this.name = name;
    }




}

 

2.实体对象

 

 

package com.helloworld.domain;
// Generated 2012-3-7 18:14:29 by Hibernate Tools 3.2.1.GA



/**
 * TbJws generated by hbm2java
 * @author  liuqing
 */
public class TbJws  implements java.io.Serializable {


     private Integer id;
     private TbPerson tbPerson;
     private String jwsname;

    public TbJws() {
    }

    public TbJws(TbPerson tbPerson, String jwsname) {
       this.tbPerson = tbPerson;
       this.jwsname = jwsname;
    }
   
    public Integer getId() {
        return this.id;
    }
    
    public void setId(Integer id) {
        this.id = id;
    }
    public TbPerson getTbPerson() {
        return this.tbPerson;
    }
    
    public void setTbPerson(TbPerson tbPerson) {
        this.tbPerson = tbPerson;
    }
    public String getJwsname() {
        return this.jwsname;
    }
    
    public void setJwsname(String jwsname) {
        this.jwsname = jwsname;
    }




}

 

 

 

package com.helloworld.domain;
// Generated 2012-3-7 18:14:29 by Hibernate Tools 3.2.1.GA


import java.util.HashSet;
import java.util.Set;

/**
 * TbPerson generated by hbm2java
 * @author  liuqing
 */
public class TbPerson  implements java.io.Serializable {


     private Integer id;
     private String name;
     private Set tbJwses = new HashSet(0);
     private Set tbAccounts = new HashSet(0);

    public TbPerson() {
    }

    public TbPerson(String name, Set tbJwses, Set tbAccounts) {
       this.name = name;
       this.tbJwses = tbJwses;
       this.tbAccounts = tbAccounts;
    }
   
    public Integer getId() {
        return this.id;
    }
    
    public void setId(Integer id) {
        this.id = id;
    }
    public String getName() {
        return this.name;
    }
    
    public void setName(String name) {
        this.name = name;
    }
    public Set getTbJwses() {
        return this.tbJwses;
    }
    
    public void setTbJwses(Set tbJwses) {
        this.tbJwses = tbJwses;
    }
    public Set getTbAccounts() {
        return this.tbAccounts;
    }
    
    public void setTbAccounts(Set tbAccounts) {
        this.tbAccounts = tbAccounts;
    }




}

 

3. QBC 多表查询方法

 

 public static void main(String args[]) {
        Session session = new Configuration().configure().buildSessionFactory().openSession();
        org.hibernate.Criteria criteria = session.createCriteria(TbPerson.class);
        //对集合对象创建别名
        criteria.createAlias("tbJwses", "a_jws");
        criteria.add(org.hibernate.criterion.Restrictions.eq("a_jws.jwsname", "3"));
        List list = criteria.list();
        for (int i = 0 ; i < list.size(); i++) {
            System.out.println("===" + ((TbPerson)list.get(i)).getName() + " id:" + ((TbPerson)list.get(i)).getId() );   
        }
    }

 

4. HQL 语言的实现

List list = session.createQuery("SELECT p FROM TbPerson p inner join p.tbJwses j WHERE j.jwsname='3'").list();
        for (int i = 0 ; i < list.size() ; i++) {
            System.out.println(list.get(i).getClass());
        }