使用MyBatis(三)使用xml查询表中所有数据

读取表中所有数据

1.修改第一篇MyBatis使用的 UserMapper.xml

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

添加了

selectAllUser

将where条件去掉

2.修改测试类

package com.yw.test03;

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

import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;

public class Test01
{
	public static void main(String[] args) throws IOException
	{
		
		String resource = "com/yw/test03/mybatis-config.xml";
		InputStream inputStream = Resources.getResourceAsStream(resource);
		SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);
		
		SqlSession session = sqlSessionFactory.openSession();
		try {
//		  User user = (User) session.selectOne("com.yw.test01.UserMapper.selectUser", 1);
//		  System.out.println(user);
		  
			List users=session.selectList("com.yw.test03.UserMapper.selectAllUser");
			System.out.println(users);
			
		} finally {
		  session.close();
		}
	}
}

修改查询为如下内容：

List users=session.selectList("com.yw.test03.UserMapper.selectAllUser");
System.out.println(users);

3.效果如下：