5.24总结

今日学习了MAVEN和Mybatis，进行了相关文件配置，代码100行

package com.itheima;

import com.itheima.mapper.UserMapper;
import com.itheima.pojo.User;
import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;

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

/**

• Mybatis 的代理开发
  */

public class MyBatisDemo2 {
public static void main(String[] args) throws IOException {
//1.加载mybatis的核心配置文件，获取sqlSessionFactory

    String resource = "mybatis-config.xml";
    InputStream inputStream = Resources.getResourceAsStream(resource);
    SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);

    //2.获取SqlSession对象，用它来执行SQL
    SqlSession sqlSession = sqlSessionFactory.openSession();

    //3.执行sql
    //List<User> users = sqlSession.selectList("test.selectAll");
    //3.1获取UserMapper接口的代理对象
    UserMapper userMapper = sqlSession.getMapper(UserMapper.class);
    List<User> users = userMapper.selectAll();

    System.out.println(users);

    //释放资源
    sqlSession.close();
}

}