vip21-javaweb/day04/src/main/java/com/lovecoding/test/MybatisUserMapperTest.java

package com.lovecoding.test;

import com.lovecoding.test.dao.UserMapper;
import com.lovecoding.test.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 org.junit.Test;

import java.io.IOException;
import java.io.InputStream;

public class MybatisUserMapperTest {

    /**
     * Mybatis 接口传递参数
     */
    @Test
    public void t1() throws IOException {
        //我们定义了 mybatis 配置文件路径
        String res = "mybatis-config.xml";
        //我们用 Resources 去把配置文件转化为 数据流
        InputStream resourceAsStream = Resources.getResourceAsStream(res);
        //我们用 mybatis SqlSessionFactoryBuilder 工厂类 去创建 SqlSessionFactory
        SqlSessionFactory build = new SqlSessionFactoryBuilder().build(resourceAsStream);
        //我们用 SqlSessionFactory 创建 SqlSession
        SqlSession sqlSession = build.openSession();
        //我们用 sqlsession 去加载 UserMapper.xml 的代理类
        UserMapper mapper = sqlSession.getMapper(UserMapper.class);

        //直接传递单个 参数调用
        User user = mapper.selectUserById(2);
        System.out.println( user );

        //使用 @Param() 绑定 接口和 XML SQL 参数的调用方法
        User u = mapper.selectUserByIdandName(2, "李四");
        System.out.println( u );

    }

}