JPA使用原生SQL查询

2019独角兽企业重金招聘Python工程师标准>>>

一、Spring3.1之前版本的方法 

import org.springframework.context.ApplicationContext;
import org.springframework.orm.jpa.support.JpaDaoSupport;
import java.util.*;
import javax.persistence.*;

public class CustomerCourseDAO extends JpaDaoSupport implements ICustomerCourseDAO {

public String findTeacherNameByCourseId(Integer courseid) {
        String sql = "select concat(c.Given_Name,' ',c.Family_Name) as teachername from customer c,customer_course cc"
                + " where c.Customer_ID = cc.Customer_ID and cc.Related_Code = 2 and  cc.Course_ID = " + courseid.intValue();
        try {
            EntityManagerFactory emf = getJpaTemplate().getEntityManagerFactory();
            EntityManager newEm = emf.createEntityManager();
            EntityTransaction newTx = newEm.getTransaction();
            newTx.begin();

            List result = newEm.createNativeQuery(sql).getResultList();
            String teachername = "";
            if(result.size()==1){
                teachername = (String)result.get(0);
            }
            newEm.getDelegate();
            newTx.commit();
            newEm.close();
            emf.close();
           
            return teachername;
        } catch (RuntimeException re) {
            logger.error("find Teacher's Name by courseId failed", re);

            throw re;
        }
    }

 
    //add by edwin， 2007-11-08 测试通过
    @SuppressWarnings(value = "unchecked")
    public List findTeaStuByCourseId(Integer id) {
        String sql = "select model.*  from  customer_course model " + "where model.Related_Code = 1 and model.Course_ID = " + id.intValue();

        try {
            EntityManagerFactory emf = getJpaTemplate().getEntityManagerFactory();
            EntityManager newEm = emf.createEntityManager();
            EntityTransaction newTx = newEm.getTransaction();
            newTx.begin();

            @SuppressWarnings(value = "unchecked")
            List stu = newEm.createNativeQuery(sql,CustomerCourse.class).getResultList();
            newTx.commit();
            newEm.close();
            emf.close();
           
            return stu;
        } catch (RuntimeException re) {
            logger.error("find Teacher's students by courseId failed", re);

            throw re;
        }
    }

}

二、Spring 3.1之后版本方法

1、在spring配置文件中配置entityManagerFactory

    
        
        
        
            
        
        
            
                false
                update
                org.hibernate.dialect.MySQL5InnoDBDialect
                
                
                

            
        
    

2、以下测试方法测试通过

	@Override
	@SuppressWarnings("unchecked")
	public List findByTaskName(String name) {
	 	EntityManagerFactory emf= (EntityManagerFactory) SpringUtils.getBean("entityManagerFactory");  //SpringUtils需要自己指定了....
	    EntityManager em=emf.createEntityManager();  
	    String querysql="select * from prism_task where taskname=?";  
	    Query query=em.createNativeQuery(querysql);  
	    query.setParameter(1, name);  
	    List tasklist=(List)query.getResultList();  
	    em.close();  
		return tasklist;
	}

 

转载于:https://my.oschina.net/u/2391658/blog/862732