整合mybatis的CRUD2

package com.itheima.dao.impl;

import com.itheima.dao.IUserDao;
import com.itheima.domain.User;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;

import java.util.List;

/**
 * @author 黑马程序员
 * @Company http://www.ithiema.com
 */
public class UserDaoImpl implements IUserDao {

    private SqlSessionFactory factory;

    public UserDaoImpl(SqlSessionFactory factory){
        this.factory = factory;
    }

    @Override
    public List findAll() {
        //1.根据factory获取SqlSession对象
        SqlSession session = factory.openSession();
        //2.调用SqlSession中的方法，实现查询列表
        List users = session.selectList("com.itheima.dao.IUserDao.findAll");//参数就是能获取配置信息的key
        //3.释放资源
        session.close();
        return users;
    }

    @Override
    public void saveUser(User user) {
        //1.根据factory获取SqlSession对象
        SqlSession session = factory.openSession();
        //2.调用方法实现保存
        session.insert("com.itheima.dao.IUserDao.saveUser",user);
        //3.提交事务
        session.commit();
        //4.释放资源
        session.close();
    }

    @Override
    public void updateUser(User user) {
        //1.根据factory获取SqlSession对象
        SqlSession session = factory.openSession();
        //2.调用方法实现更新
        session.update("com.itheima.dao.IUserDao.updateUser",user);
        //3.提交事务
        session.commit();
        //4.释放资源
        session.close();
    }

    @Override
    public void deleteUser(Integer userId) {
        //1.根据factory获取SqlSession对象
        SqlSession session = factory.openSession();
        //2.调用方法实现更新
        session.update("com.itheima.dao.IUserDao.deleteUser",userId);
        //3.提交事务
        session.commit();
        //4.释放资源
        session.close();
    }

    @Override
    public User findById(Integer userId) {
        //1.根据factory获取SqlSession对象
        SqlSession session = factory.openSession();
        //2.调用SqlSession中的方法，实现查询一个
        User user = session.selectOne("com.itheima.dao.IUserDao.findById",userId);
        //3.释放资源
        session.close();
        return user;
    }

    @Override
    public List findByName(String username) {
        //1.根据factory获取SqlSession对象
        SqlSession session = factory.openSession();
        //2.调用SqlSession中的方法，实现查询列表
        List users = session.selectList("com.itheima.dao.IUserDao.findByName",username);
        //3.释放资源
        session.close();
        return users;
    }

    @Override
    public int findTotal() {
        //1.根据factory获取SqlSession对象
        SqlSession session = factory.openSession();
        //2.调用SqlSession中的方法，实现查询一个
        Integer count = session.selectOne("com.itheima.dao.IUserDao.findTotal");
        //3.释放资源
        session.close();
        return count;
    }
}

mapper

DOCTYPE mapper
        PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-mapper.dtd">


    
    
        select * from user;
    

    
    
        
        
            select last_insert_id();
        
        insert into user(username,address,sex,birthday)values(#{username},#{address},#{sex},#{birthday});
    

    
    
        update user set username=#{username},address=#{address},sex=#{sex},birthday=#{birthday} where id=#{id}
    

    
    
        delete from user where id = #{uid}
    
    
    
    
        select * from user where id = #{uid}
    

    
    
          select * from user where username like #{name}
   

    
    
        select count(id) from user;
    

sqlconfig

DOCTYPE configuration
        PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-config.dtd">

    
    default="mysql">
        
        
            
            

            
            
                
                
                
                
            
        
    
    
    
        
    

test

package com.itheima.test;

import com.itheima.dao.IUserDao;
import com.itheima.dao.impl.UserDaoImpl;
import com.itheima.domain.User;
import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;

import java.io.InputStream;
import java.util.Date;
import java.util.List;

/**
 * @author 黑马程序员
 * @Company http://www.ithiema.com
 *
 * 测试mybatis的crud操作
 */
public class MybatisTest {

    private InputStream in;
    private IUserDao userDao;

    @Before//用于在测试方法执行之前执行
    public void init()throws Exception{
        //1.读取配置文件，生成字节输入流
        in = Resources.getResourceAsStream("SqlMapConfig.xml");
        //2.获取SqlSessionFactory
        SqlSessionFactory factory = new SqlSessionFactoryBuilder().build(in);
        //3.使用工厂对象，创建dao对象
        userDao = new UserDaoImpl(factory);
    }

    @After//用于在测试方法执行之后执行
    public void destroy()throws Exception{
        //6.释放资源
        in.close();
    }

    /**
     * 测试查询所有
     */
    @Test
    public void testFindAll(){
        //5.执行查询所有方法
        List users = userDao.findAll();
        for(User user : users){
            System.out.println(user);
        }

    }
    /**
     * 测试保存操作
     */
    @Test
    public void testSave(){
        User user = new User();
        user.setUsername("dao impl user");
        user.setAddress("北京市顺义区");
        user.setSex("男");
        user.setBirthday(new Date());
        System.out.println("保存操作之前："+user);
        //5.执行保存方法
        userDao.saveUser(user);

        System.out.println("保存操作之后："+user);
    }

    /**
     * 测试更新操作
     */
    @Test
    public void testUpdate(){
        User user = new User();
        user.setId(50);
        user.setUsername("userdaoimpl update user");
        user.setAddress("北京市顺义区");
        user.setSex("女");
        user.setBirthday(new Date());

        //5.执行保存方法
        userDao.updateUser(user);
    }

    /**
     * 测试删除操作
     */
    @Test
    public void testDelete(){
        //5.执行删除方法
        userDao.deleteUser(54);
    }

    /**
     * 测试删除操作
     */
    @Test
    public void testFindOne(){
        //5.执行查询一个方法
        User  user = userDao.findById(50);
        System.out.println(user);
    }

    /**
     * 测试模糊查询操作
     */
    @Test
    public void testFindByName(){
        //5.执行查询一个方法
        List users = userDao.findByName("%王%");
        for(User user : users){
            System.out.println(user);
        }
    }

    /**
     * 测试查询总记录条数
     */
    @Test
    public void testFindTotal(){
        //5.执行查询一个方法
        int count = userDao.findTotal();
        System.out.println(count);
    }



}

pom

         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    4.0.0

    com.itheima
    day02_eesy_02mybatsiDAO
    1.0-SNAPSHOT
    jar

    
        
            org.mybatis
            mybatis
            3.4.5
        

        
            mysql
            mysql-connector-java
            5.1.6
        

        
            log4j
            log4j
            1.2.12
        

        
            junit
            junit
            4.10
        
    

 

转载于:https://www.cnblogs.com/yangshuyuan1009/p/11482141.html