Hibernate之HQL查询小Demo
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代码:
#数据模型层
package com.sunline.entity;/** * User entity. @author MyEclipse Persistence Tools */public class User implements java.io.Serializable { // Fields private Integer id; private String userName; private String userPassword; private String userInfo; // Constructors /** default constructor */ public User() { } /** full constructor */ public User(String userName, String userPassword, String userInfo) { this.userName = userName; this.userPassword = userPassword; this.userInfo = userInfo; } // Property accessors public Integer getId() { return this.id; } public void setId(Integer id) { this.id = id; } public String getUserName() { return this.userName; } public void setUserName(String userName) { this.userName = userName; } public String getUserPassword() { return this.userPassword; } public void setUserPassword(String userPassword) { this.userPassword = userPassword; } public String getUserInfo() { return this.userInfo; } public void setUserInfo(String userInfo) { this.userInfo = userInfo; }}<?xml version="1.0" encoding="utf-8"?><!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN""http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd"><!-- Mapping file autogenerated by MyEclipse Persistence Tools--><hibernate-mapping> <class name="com.sunline.entity.User" table="user" catalog="association"> <id name="id" type="java.lang.Integer"> <column name="id" /> <generator class="native"></generator> </id> <property name="userName" type="java.lang.String"> <column name="user_name" length="200" not-null="true" /> </property> <property name="userPassword" type="java.lang.String"> <column name="user_password" length="50" not-null="true" /> </property> <property name="userInfo" type="java.lang.String"> <column name="user_info" length="60" not-null="true" /> </property> </class></hibernate-mapping>
#数据访问层
package com.sunline.dao;import java.util.ArrayList;import java.util.HashMap;import java.util.List;import java.util.Map;import javax.annotation.Resource;import org.hibernate.HibernateException;import org.hibernate.Query;import org.hibernate.Session;import org.hibernate.SessionFactory;import org.hibernate.Transaction;import org.springframework.orm.hibernate3.support.HibernateDaoSupport;import org.springframework.stereotype.Repository;import com.sunline.entity.User;import com.sunline.sessionFactory.HibernateSessionFactory;@Repository(value="userDao")public class UserDao extends HibernateDaoSupport { private Session session; private Transaction tx; HibernateSessionFactory getSession; /* * 使用注解必须添加以下方式 */ @Resource public void setSessionFacotry(SessionFactory sessionFacotry) { super.setSessionFactory(sessionFacotry); } /* * 查询所有用户 */ public List<User> findAll(){ getSession = new HibernateSessionFactory(); session = getSession.getSession(); String hql = "from User"; Query query = session.createQuery(hql); List<User> list = query.list(); session.close();return list; } /* * 添加用户 */ public void AddUser(User user){ getSession = new HibernateSessionFactory(); session = getSession.getSession(); try { tx = session.beginTransaction();System.out.println("成功添加用户!");session.save(user);tx.commit();session.close();} catch (Exception e) {// TODO Auto-generated catch blockSystem.out.println("添加用户失败!");e.printStackTrace();} } /* * 通过id取得某个用户信息 */ public User findById(int id){ getSession = new HibernateSessionFactory(); session = getSession.getSession(); User user = null;try {String hql = "from User where id=:id";Query query = session.createQuery(hql);query.setParameter("id", id);user = (User) query.uniqueResult();System.out.println("查询用户信息成功!");session.close();} catch (Exception e) {// TODO Auto-generated catch blockSystem.out.println("查询用户信息失败!");e.printStackTrace();}return user; } /* * 修改用户信息(个人觉得这种方式不灵活,固定要修改整个对象) */ public void UpdateUserInfo(User user){ getSession = new HibernateSessionFactory(); session = getSession.getSession(); tx = session.beginTransaction(); try {session.update(user);System.out.println("成功修改数据!");tx.commit();session.close();} catch (Exception e) {// TODO Auto-generated catch blockSystem.out.println("修改数据失败!");e.printStackTrace();} } /* * 删除用户信息 */ public void deleteUser(int id){ getSession = new HibernateSessionFactory(); session = getSession.getSession(); tx = session.beginTransaction(); try {String hql = "delete from User where id=:id";Query query = session.createQuery(hql);query.setParameter("id", id);query.executeUpdate();System.out.println("成功删除数据!");tx.commit();session.close();} catch (Exception e) {// TODO Auto-generated catch blockSystem.out.println("删除数据失败!");e.printStackTrace();} } /* * 获取用户信息总数 */ public int getUserCount(){ getSession = new HibernateSessionFactory(); session = getSession.getSession(); int count = 0; try {String hql = "select count(u) from User u";Query query = session.createQuery(hql);Number num = (Number) query.uniqueResult();count = num.intValue();System.out.println("成功获取数据!");session.close();} catch (Exception e) {// TODO Auto-generated catch blockSystem.out.println("获取数据失败!");e.printStackTrace();}return count; } /* * 获取分页信息 */ public List<User> getUserPageList(int pageNum, int pageSize){ getSession = new HibernateSessionFactory(); session = getSession.getSession(); List<User> list = new ArrayList<User>(); try {String hql = "from User";Query query = session.createQuery(hql);query.setFirstResult((pageNum-1)*pageSize); query.setMaxResults(pageSize);list =query.list();System.out.println("成功获取数据!");session.close();} catch (Exception e) {// TODO Auto-generated catch blockSystem.out.println("获取数据失败!");e.printStackTrace();}return list; } /* * 通过输入用户名和密码获取用户信息,用于用户登录 */ public User Login(String user_name,String user_password){ getSession = new HibernateSessionFactory(); session = getSession.getSession(); User user = null; try {String hql = "from User where userName=? and userPassword=?";Query query = session.createQuery(hql);query.setString(0, user_name);query.setString(1, user_password);user = (User) query.uniqueResult();System.out.println("成功获取用户登录数据!");session.close();} catch (Exception e) {// TODO Auto-generated catch blockSystem.out.println("获取用户登录数据失败!");e.printStackTrace();} return user; } /* * 模糊查询 */ public List<User> findByMoHu(String user_name, String user_password){ getSession = new HibernateSessionFactory(); session = getSession.getSession(); List<User> list = new ArrayList<User>(); try { String hql = "FROM User u WHERE u.userName=? AND u.userPassword like ?"; Query query = session.createQuery(hql); String password = "%"+user_password+"%"; query.setString(0, user_name); query.setString(1, password); list = query.list(); System.out.println("模糊查询到数据!"); session.close();} catch (Exception e) {// TODO Auto-generated catch blockSystem.out.println("查询数据失败!");e.printStackTrace();}return list; } /* * 查询指定字段 */ public List<Object []> findByEle(){ getSession = new HibernateSessionFactory(); session = getSession.getSession(); List<Object []> list = new ArrayList<Object[]>(); try {String hql = "select userName,userPassword from User";Query query = session.createQuery(hql);list = query.list();System.out.println("成功查询到数据!");session.close();} catch (Exception e) {// TODO Auto-generated catch blockSystem.out.println("查询数据失败!");e.printStackTrace();}return list; } /* * 使用Map进行封装查询 */ public User findByMap(String userName,String UserPassword){ getSession = new HibernateSessionFactory(); session = getSession.getSession(); Map<String, String> map = new HashMap<String, String>(); map.put("userName", userName); map.put("userPassword", UserPassword); User user = null; try {String hql = "from User where userName = :userName and userPassword = :userPassword";Query query = session.createQuery(hql);query.setParameter("userName", map.get("userName")); query.setParameter("userPassword", map.get("userPassword")); user = (User) query.uniqueResult(); System.out.println("成功查询到数据!");session.close();} catch (Exception e) {// TODO Auto-generated catch blockSystem.out.println("查询数据失败!");e.printStackTrace();}return user; } /* * 使用 in来设置基于列表的查询(设置查询区间) */ public List<User> findByIn(String name){ getSession = new HibernateSessionFactory(); session = getSession.getSession(); List<User> list = new ArrayList<User>(); try { String hql = "from User u where u.userName like ? and u.id in ( :id )"; Query query = session.createQuery(hql); String Name = "%"+name+"%"; query.setString(0, Name); query.setParameterList("id", new Integer[] {5,6,7}); //显示出id号为以上的用户 list = query.list(); System.out.println("查询到区间数据!"); session.close();} catch (Exception e) {// TODO Auto-generated catch blockSystem.out.println("查询区间数据失败!");e.printStackTrace();}return list; }}#业务逻辑层
package com.sunline.biz;import java.util.List;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.beans.factory.annotation.Qualifier;import org.springframework.stereotype.Service;import com.sunline.dao.UserDao;import com.sunline.entity.User;@Service(value="userBiz")public class UserBiz {@Autowired@Qualifier("userDao") //使用@Qualifier注解来说明使用哪一个实现类 UserDao userDao;/* * 查询所有用户 */public List<User> findAll(){return userDao.findAll();} /* * 添加用户 */ public void AddUser(User user){ userDao.AddUser(user); } /* * 通过id取得某个用户信息 */ public User findById(int id){ return userDao.findById(id); } /* * 修改用户信息(个人觉得这种方式不灵活) */ public void UpdateUserInfo(User user){ userDao.UpdateUserInfo(user); } /* * 删除用户信息 */ public void deleteUser(int id){ userDao.deleteUser(id); } /* * 获取用户信息总数 */ public int getUserCount(){ return userDao.getUserCount(); } /* * 获取分页信息 */ public List<User> getUserPageList(int pageNum, int pageSize){ return userDao.getUserPageList(pageNum, pageSize); } /* * 通过输入用户名和密码获取用户信息,用于用户登录 */ public User Login(String user_name,String user_password){ return userDao.Login(user_name, user_password); } /* * 模糊查询 */ public List<User> findByMoHu(String user_name, String user_password){ return userDao.findByMoHu(user_name, user_password); } /* * 查询指定字段 */ public List<Object []> findByEle(){ return userDao.findByEle(); } /* * 使用Map进行封装查询 */ public User findByMap(String userName,String UserPassword){ return userDao.findByMap(userName, UserPassword); } /* * 使用 in来设置基于列表的查询(设置查询区间) */ public List<User> findByIn(String name){ return userDao.findByIn(name); }}#测试层
package com.sunline.test;import java.util.List;import org.springframework.context.ApplicationContext;import org.springframework.context.support.ClassPathXmlApplicationContext;import com.sunline.biz.UserBiz;import com.sunline.entity.User;public class Test {/** * @param args */public static void main(String[] args) {// TODO Auto-generated method stub ApplicationContext ctx = new ClassPathXmlApplicationContext("applicationContext.xml"); UserBiz userBiz = (UserBiz) ctx.getBean("userBiz"); /* * 1.查询所有用户 */ List<User> list = userBiz.findAll(); for(User user : list){ System.out.println("你的个人信息为: "+user.getUserName()+" "+user.getUserPassword()+" "+user.getUserInfo()); } /* * 2.添加用户 */ User user = new User(); user.setUserName("晓林"); user.setUserPassword("123456"); user.setUserInfo("是一个Java工程师"); userBiz.AddUser(user); /* * 3.通过id取得某个用户信息 */ User user = userBiz.findById(2); System.out.println("你的个人信息为: "+user.getUserName()+" "+user.getUserPassword()+" "+user.getUserInfo()); /* * 4.修改用户信息 */ User user = new User(); user.setId(2); user.setUserName("杨旭"); user.setUserPassword("123456"); user.setUserInfo("山东大学学生"); userBiz.UpdateUserInfo(user); /* * 5.删除用户信息 */ userBiz.deleteUser(1); /* * 6.获取用户信息总数 */ int count = userBiz.getUserCount(); System.out.println("一共有"+count+"位用户"); /* * 7.获取分页信息 */ List<User> list = userBiz.getUserPageList(1, 1); for(User user : list){ System.out.println("你的个人信息为: "+user.getUserName()+" "+user.getUserPassword()+" "+user.getUserInfo()); } /* * 8.通过输入用户名和密码获取用户信息,用于模拟用户登录 */ String user_name = "杨旭"; String user_password = "123456"; User user = userBiz.Login(user_name, user_password); System.out.println("你的个人信息为: "+user.getUserName()+" "+user.getUserPassword()+" "+user.getUserInfo()); /* * 9.模糊查询 */ String user_name = "杨旭"; String user_password = "123"; List<User> list = userBiz.findByMoHu(user_name, user_password); for(User user : list){ System.out.println("你的个人信息为: "+user.getUserName()+" "+user.getUserPassword()+" "+user.getUserInfo()); } /* * 10.查询指定字段 */ List<Object []> list = userBiz.findByEle(); for(Object [] object : list){ String name = (String) object[0]; String password = (String) object[1]; System.out.println("你的个人信息为--->用户名:"+name + ",密码:" +password); } /* * 11.使用Map进行封装查询 */ String userName = "杨旭"; String UserPassword = "123456"; User user = userBiz.findByMap(userName, UserPassword); System.out.println("你的个人信息为: "+user.getUserName()+" "+user.getUserPassword()+" "+user.getUserInfo()); /* * 12.使用 in来设置基于列表的查询(设置查询区间) */ String user_name = "晓"; List<User> list = userBiz.findByIn(user_name); for(User user : list){ System.out.println("你的个人信息为: "+user.getUserName()+" "+user.getUserPassword()+" "+user.getUserInfo()); }}}阅读全文
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