jpa 如果bean里有联合主键需要自己写handler

/**
	 * 查找学生的课程 
	 * 没有加上学生类型
	 * */
	public boolean findStdCourseByScId(int uid, int cid) {

//		String sql = "select * from 7east_usercourse_right where userid=? and courseid=? and type=1";
		String sql = "select * from 7east_usercourse_right where userid=? and courseid=?";
		UserCourseMapper argTypes =new UserCourseMapper();
		
		Object[] args = new Object[] { uid, cid };
		List<UserCourse> list = getJdbcTemplate().query(sql, args, argTypes );
	
		if(list!=null){
			for(UserCourse c:list){	if(list.size()>0){
				
				System.out.println("findStdCourseByScId:"+c.toString());
				}
			}
			
			return list.size()>0?true:false;
			
		}else{
			return false;
		}
	}












package com.qieast.platform.admincp.dao.impl;

import java.sql.ResultSet;
import java.sql.SQLException;

import org.springframework.jdbc.core.RowMapper;

import com.qieast.platform.model.Teacher;
import com.qieast.platform.model.UserCourse;
import com.qieast.platform.model.UserCourseRightPK;

public class UserCourseMapper implements RowMapper<UserCourse>{
	


	public UserCourse mapRow(ResultSet rs, int rowNum) throws SQLException {
		UserCourse userCourse =new UserCourse();
		UserCourseRightPK userCourseRightPK = new UserCourseRightPK();
	
		userCourseRightPK.setCourseid(rs.getInt("courseid"));
		userCourseRightPK.setType(rs.getString("type"));
		userCourseRightPK.setUserid(rs.getInt("userid"));
		
		userCourse.setId(userCourseRightPK);
		userCourse.setEndtime(rs.getInt("endtime"));
		userCourse.setLessonnumber(rs.getInt("lessonnumber"));
		userCourse.setListentimes(rs.getInt("listentimes"));
		userCourse.setStarttime(rs.getInt("starttime"));
		userCourse.setTotallessonnumber(rs.getInt("totallessonnumber"));
		return userCourse;

	}

}

@Data
public class UserCourse implements Serializable {
	private static final long serialVersionUID = 1L;

	private int endtime;

	@EmbeddedId
	private UserCourseRightPK id;

	private int lessonnumber;

	private int listentimes;

	private int starttime;

	private int totallessonnumber;

	public UserCourse() {
    }


@Data
public class UserCourseRightPK implements Serializable {
	//default serial version id, required for serializable classes.
	private static final long serialVersionUID = 1L;

	private int courseid;

	private String type;

	private int userid;

/**
 * 联合主键
 * 
 * 1、必须实现Serializable序列化 2、必须提示无参的构造方法 3、必须重写hashCode和equals方法
 * 
 * @Embeddable 表示该类中所有属性在应用该联合主键的类中作为它的属性（字段）
 * @author 张明学
 * 
 */

@Embeddable
public class AirLinePK implements Serializable {

	private String staCity;

	private String endCity;

	public AirLinePK() {

	}

	public AirLinePK(String staCity, String endCity) {
		this.staCity = staCity;
		this.endCity = endCity;
	}

	@Column(nullable = false, length = 32)
	public String getStaCity() {
		return staCity;
	}

	public void setStaCity(String staCity) {
		this.staCity = staCity;
	}

	@Column(nullable = false, length = 32)
	public String getEndCity() {
		return endCity;
	}

	public void setEndCity(String endCity) {
		this.endCity = endCity;
	}

	@Override
	public int hashCode() {
		final int PRIME = 31;
		int result = 1;
		result = PRIME * result + ((endCity == null) ? 0 : endCity.hashCode());
		result = PRIME * result + ((staCity == null) ? 0 : staCity.hashCode());
		return result;
	}

	@Override
	public boolean equals(Object obj) {
		if (this == obj)
			return true;
		if (obj == null)
			return false;
		if (getClass() != obj.getClass())
			return false;
		final AirLinePK other = (AirLinePK) obj;
		if (endCity == null) {
			if (other.endCity != null)
				return false;
		} else if (!endCity.equals(other.endCity))
			return false;
		if (staCity == null) {
			if (other.staCity != null)
				return false;
		} else if (!staCity.equals(other.staCity))
			return false;
		return true;
	}

}

@Entity
@Table(name = "AIRLINE")
public class AirLineEntity {

	private AirLinePK a_id;

	private String a_name;

	// 联合主键
	@EmbeddedId
	public AirLinePK getA_id() {
		return a_id;
	}

	public void setA_id(AirLinePK a_id) {
		this.a_id = a_id;
	}

	@Column(length = 50)
	public String getA_name() {
		return a_name;
	}

	public void setA_name(String a_name) {
		this.a_name = a_name;
	}

}


public class CompositePKTest {
	@Test
	public void save(){
		EntityManagerFactory factory = Persistence.createEntityManagerFactory("mengya");
		EntityManager em = factory.createEntityManager();
		em.getTransaction().begin();
		
		AirLineEntity airLine = new AirLineEntity();
		airLine.setA_id(new AirLinePK("BeJing","ShangHai"));
		airLine.setA_name("北京至上海");
		
		em.persist(airLine);
		
		em.getTransaction().commit();
		em.close();
		factory.close();
	}
}