Mybatis中实体类中的字段跟对应表的字段不一致时解决办法

解决字段名与实体类属性名不相同的冲突

实体类字段：

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

对应数据库表字段：

CREATE TABLE orders(
    order_id INT PRIMARY KEY AUTO_INCREMENT,
    order_no VARCHAR(20), 
    order_price FLOAT
);

 

方式一:通过在sql语句中定义别名:

<select id="selectOrder" parameterType="int" resultType="_Order">
    select order_id id, order_no orderNo,order_price price from orders where order_id=#{id}
</select>

方式二: 通过<resultMap>

 

<select id="selectOrderResultMap" parameterType="int" resultMap="orderResultMap">
    select * from orders where order_id=#{id}
</select>
<resultMap type="_Order" id="orderResultMap">
    <id property="id" column="order_id"/>
    <result property="orderNo" column="order_no"/>
    <result property="price" column="order_price"/>
</resultMap>