项目结构：

准备表和数据：

CREATE TABLE orders(
	order_id INT PRIMARY KEY AUTO_INCREMENT,
	order_no VARCHAR(20), 
	order_price FLOAT
);
INSERT INTO orders(order_no, order_price) VALUES('aaaa', 23);
INSERT INTO orders(order_no, order_price) VALUES('bbbb', 33);
INSERT INTO orders(order_no, order_price) VALUES('cccc', 22);

Order实体类代码：

package com.atguigu.mybatis.bean;

public class Order {
	private int id;
	private String orderNo;
	private float price;

	public Order(int id, String orderNo, float price) {
		super();
		this.id = id;
		this.orderNo = orderNo;
		this.price = price;
	}

	public Order() {
		super();
	}

	public int getId() {
		return id;
	}

	public void setId(int id) {
		this.id = id;
	}

	public String getOrderNo() {
		return orderNo;
	}

	public void setOrderNo(String orderNo) {
		this.orderNo = orderNo;
	}

	public float getPrice() {
		return price;
	}

	public void setPrice(float price) {
		this.price = price;
	}

	@Override
	public String toString() {
		return "Order [id=" + id + ", orderNo=" + orderNo + ", price=" + price
				+ "]";
	}

}

	
	
	
	
		select order_id id, order_no orderNo, order_price price from orders where order_id=#{id}
	
	
	
	
		select * from orders where order_id=#{id}
	
	
	
	 
	 	
	 	
	 	
	 
	 

package com.atguigu.mybatis.utils;

import java.io.InputStream;

import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;

public class MybatisUtils {

	public static SqlSessionFactory getFactory() {
		String resource = "conf.xml";
		InputStream inputStream = MybatisUtils.class.getClassLoader().getResourceAsStream(resource);

		SqlSessionFactory factory = new SqlSessionFactoryBuilder().build(inputStream);

		return factory;
	}
}

package com.atguigu.mybatis.test3;

import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;

import com.atguigu.mybatis.bean.Order;
import com.atguigu.mybatis.utils.MybatisUtils;

/*
 * 测试:　解决字段名与实体类属性名不相同的冲突
 */
public class Test3 {
	
	public static void main(String[] args) {
		
		SqlSessionFactory factory=MybatisUtils.getFactory();
		SqlSession session=factory.openSession();
		
		String statement="com.atguigu.mybatis.bean.orderMapper.getOrder";
		statement="com.atguigu.mybatis.bean.orderMapper.getOrder2";
		
		Order order =session.selectOne(statement, 3);
		System.out.println(order);
		session.close();
	}
	
}

driver=com.mysql.jdbc.Driver
url=jdbc:mysql://localhost:3306/mybatis
name=root
password=123456