Hibernate 操作数据库

com.tao.pojo实体类
 
package com.tao.pojo;
 
public class User {
    private int id;
    private String name;
    private String password;
 
    public User() {
        super();
    }
    public User(int id, String name, String password) {
        super();
        this.id = id;
        this.name = name;
        this.password = password;
    }
    public int getId() {
        return id;
    }
    public void setId(int id) {
        this.id = id;
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public String getPassword() {
        return password;
    }
    public void setPassword(String password) {
        this.password = password;
    }
    @Override
    public String toString() {
        return "User [id=" + id + ", name=" + name + ", password=" + password + "]";
    }
 
}
 
User.hbm.xml映射文件
 
<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC
    "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
    "http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd">
 
<hibernate-mapping package="org.hibernate.test.schemaupdate">
 
    <class name="com.tao.pojo.User" table="user">
        <id name="id">
            <generator class="identity"></generator>
        </id>
        <property name="name"/>
        <property name="password" column="pass"/>
    </class>
 
</hibernate-mapping>
 
配置文件hibernate.cfg.xml
 
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-configuration PUBLIC
        "-//Hibernate/Hibernate Configuration DTD 3.0//EN"
        "http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
    <session-factory>
        <property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>
        <property name="hibernate.connection.password">root</property>
        <property name="hibernate.connection.url">jdbc:mysql://localhost:3306/test0102?characterEncoding=utf-8</property>
        <property name="hibernate.connection.username">root</property>
        <property name="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property>
        <property name="show_sql">true</property>
        <property name="format_sql">true</property>
 
        <!-- 因为加载的时候只加载配置文件，没有加载映射文件，让它去找 -->
        <mapping resource="com/tao/pojo/User.hbm.xml"/>
    </session-factory>
</hibernate-configuration>
 
DAO方法
com.tao.dao
 
package com.tao.dao;
 
import java.util.List;
 
public interface BaseDAO<T> {
//    通用的功能
    public List<T> findAll();
 
    public T findById(int id);
 
    public void deleteById(int id);
 
    public boolean update(T t);
 
    public boolean save(T t);
 
}
 
package com.tao.dao;
 
import com.tao.pojo.User;
 
public interface UserDAO extends BaseDAO<User> {
 
    public User login(String name,String password);
 
}
 
实现类 com.tao.dao.Impl
 
package com.tao.dao.Impl;
 
import java.io.Serializable;
import java.util.List;
 
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;
import org.hibernate.query.Query;
 
import com.tao.dao.UserDAO;
import com.tao.pojo.User;
 
public class UserDAOImpl implements UserDAO{
 
    @Override
    public List<User> findAll() {
        // TODO Auto-generated method stub
        Configuration configure = new Configuration().configure();
        SessionFactory factory = configure.buildSessionFactory();
        Session session = factory.openSession();
        session.beginTransaction();
        Query<User> query = session.createQuery("from User", User.class);
        List<User> list = query.list();
 
        session.getTransaction().commit();
        session.close();
        factory.close();
 
        return list;
    }
 
    @Override
    public User findById(int id) {
        // TODO Auto-generated method stub
        Configuration configure = new Configuration().configure();
        SessionFactory factory = configure.buildSessionFactory();
        Session session = factory.openSession();
        session.beginTransaction();
        Query<User> query = session.createQuery("from User where id=?", User.class);
        query.setParameter(0, id);
        User user = query.uniqueResult();
 
        session.getTransaction().commit();
        session.close();
        factory.close();
 
        return user;
    }
 
    @Override
    public void deleteById(int id) {
        // TODO Auto-generated method stub
        Configuration configure = new Configuration().configure();
        SessionFactory factory = configure.buildSessionFactory();
        Session session = factory.openSession();
        session.beginTransaction();
        //方法1
//        User user = session.get(User.class, id);
//        session.delete(user);
        //放法2
//        User user = new User();
//        user.setId(id);
//        session.delete(user);
 
        //方法3
        Query query = session.createQuery("delete from User where id=?");
        query.setParameter(0, id);
        int rows = query.executeUpdate();
        System.out.println(rows+"=============rows");
        session.getTransaction().commit();
        session.close();
        factory.close();
 
    }
 
    @Override
    public boolean update(User t) {
        // TODO Auto-generated method stub
        Configuration configure = new Configuration().configure();
        SessionFactory factory = configure.buildSessionFactory();
        Session session = factory.openSession();
        session.beginTransaction();
        //update()只根据Id更新
//        session.update(t);
 
        //HQL语句(User是类名，name,password是类里面的属性名)
        Query query = session.createQuery("update User set name=?,password=? where id=?");
        query.setParameter(0, t.getName());
        query.setParameter(1, t.getPassword());
        query.setParameter(2, t.getId());
        int rows = query.executeUpdate();
 
        session.getTransaction().commit();
        session.close();
        factory.close();
        if(rows>0) {
            return true;
        }
        return false;
    }
 
    @Override
    public boolean save(User t) {
        // TODO Auto-generated method stub
        Configuration configure = new Configuration().configure();
        SessionFactory factory = configure.buildSessionFactory();
        Session session = factory.openSession();
        session.beginTransaction();
        Integer id = (Integer) session.save(t);
 
        session.getTransaction().commit();
        session.close();
        factory.close();
        if(id>0) {
            return true;
        }
        return false;
    }
 
    @Override
    public User login(String name, String password) {
        // TODO Auto-generated method stub
        Configuration configure = new Configuration().configure();
        SessionFactory factory = configure.buildSessionFactory();
        Session session = factory.openSession();
        session.beginTransaction();
        Query<User> query = session.createQuery("from User where name=? and password=?",User.class);
        query.setParameter(0, name).setParameter(1, password);
        User user = query.uniqueResult();
 
        session.getTransaction().commit();
        session.close();
        factory.close();
        return user;
    }
 
}
JUnit测试
 
package com.tao.test;
 
import static org.junit.Assert.*;
 
import java.util.List;
 
import org.junit.Test;
 
import com.tao.dao.Impl.UserDAOImpl;
import com.tao.pojo.User;
 
public class JUnit_User {
 
    UserDAOImpl impl = new UserDAOImpl();
    @Test
    public void testAll() {
        List<User> list = impl.findAll();
        for (User uu : list) {
            System.out.println(uu);
        }
 
    }
    @Test
    public void testById() {
 
        User user = impl.findById(2);
        System.out.println(user);
    }
 
    @Test
    public void testdeleteById() {
        System.out.println("delete++++++++++++++++++");
        impl.deleteById(10);
 
    }
 
    @Test
    public void save() {
        User user = new User(12, "ss", "ss");
        boolean b = impl.save(user);
        System.out.println(b);
    }
 
    @Test
    public void update() {
        User user = new User(2, "ss", "222");
        impl.update(user);
    }
 
    //登录
    @Test
    public void login() {
        User user = impl.login("ss", "222");
        System.out.println(user);
    }
 
}