3. 使用注解方式配置

在接口方法上使用 @Results 注解：

java

复制

@Select("SELECT user_name, create_time FROM user WHERE id = #{id}")
@Results({
    @Result(column = "user_name", property = "userName"),
    @Result(column = "create_time", property = "createTime")
})
User selectUserById(Long id);

开启自动驼峰命名在spring配置文件中写如下的代码：

<!-- MyBatis配置 -->
<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
    <property name="dataSource" ref="dataSource"/>
    <property name="mapperLocations" value="classpath:mappers/*.xml"/>
    <property name="typeAliasesPackage" value="com.stu.entity"/>

    <property name="configuration">
        <bean class="org.apache.ibatis.session.Configuration">
            <!-- 开启驼峰转下划线自动映射 -->
            <property name="mapUnderscoreToCamelCase" value="true"/>
        </bean>
    </property>

</bean>