Mybatis - 懒加载，二级缓存

<!--开启全局延迟加载开关-->
<setting name="lazyLoadingEnabled" value="true"/>
<!--指定哪些方法触发延迟加载,默认:equals,clone,hashCode,toString-->
<setting name="lazyLoadTriggerMethods" value=""/>

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper
        PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.harbin.dao.UserMapper">
    <resultMap id="UserResultMap" type="user">
        <id property="id" column="id"></id>
        <result property="name" column="name"></result>
        <!--一对多关系：column是slect中方法查找条件的参数-->
        <collection property="cars" ofType="car" column="id" select="com.harbin.dao.CarMapper.findByUId"></collection>
    </resultMap>
    <!--List<User> find()-->
    <select id="find" resultMap="UserResultMap">
        select * from user
    </select>
</mapper>

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper
        PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.harbin.dao.CarMapper">
    <!--List<Car> findByUId(Integer uId)-->
    <select id="findByUId" resultType="car">
        select * from car where uId = #{uId}
    </select>
</mapper>