hibernate HQL

package com.h3c.zgc.user.po;



import javax.persistence.Column;

import javax.persistence.Entity;

import javax.persistence.Id;

import javax.persistence.Table;

@Entity

@Table(name="student")

public class Student {

    @Id

    @Column(name="id")

    private int id;

    @Column(name="student_name")

    private String studentName;



    public int getId() {

        return id;

    }



    public void setId(int id) {

        this.id = id;

    }



    public String getStudentName() {

        return studentName;

    }



    public void setStudentName(String studentName) {

        this.studentName = studentName;

    }

}

package com.h3c.zgc.base;



import java.util.Map;



public interface BaseDao<T> {



    long findCount(String hql,Map<String, Object> params);

}

package com.h3c.zgc.base;



import java.util.Map;

import java.util.Map.Entry;

import java.util.Set;



import javax.annotation.Resource;



import org.hibernate.Query;

import org.hibernate.Session;

import org.hibernate.SessionFactory;

import org.springframework.stereotype.Repository;

@Repository

public class BaseDaoHibernate4<T> implements BaseDao<T>{

    @Resource

    private SessionFactory sessionFactory;

    

    public Session getSession(){

        return this.sessionFactory.getCurrentSession();

    }

    @Override

    public long findCount(String hql, Map<String, Object> params) {

        Query query = this.getSession()

                      .createQuery(hql);

        Set<Entry<String, Object>> ens = params.entrySet();              

        for(Entry<String,Object> ent:ens){

            query.setParameter(ent.getKey(), ent.getValue());

        }

        return (long) query.list().get(0);

    }



}

package com.h3c.zgc.user.service;



import java.util.HashMap;

import java.util.Map;



import javax.annotation.Resource;



import org.springframework.stereotype.Service;

import org.springframework.transaction.annotation.Transactional;



import com.h3c.zgc.user.dao.StudentDao;

import com.h3c.zgc.user.po.Student;

@Service

public class StudentService {

    @Resource

    private StudentDao studentDao;

    @Transactional

    public long getCount(Student s){

        String hql ="select count(id) from Student where studentName =:name";

        Map<String,Object> params = new HashMap<String, Object>();

        params.put("name", s.getStudentName());

        return this.studentDao.getTotalCount(hql, params);

    }

}

package com.h3c.zgc.user.test;

import org.junit.Test;

import org.springframework.context.ApplicationContext;

import org.springframework.context.support.ClassPathXmlApplicationContext;

import com.h3c.zgc.user.po.Student;

import com.h3c.zgc.user.service.StudentService;



public class TestSpring {

    @Test

    public void test1(){

        ApplicationContext wac = new ClassPathXmlApplicationContext("spring/mvc/action-servlet.xml");

        StudentService ss = (StudentService) wac.getBean("studentService");

        Student s = new Student();

        s.setStudentName("name");

        System.out.println(ss.getCount(s));

        

        

    }

    

    

}