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<resultMap id="userMap" type="User">
    <id property="id" column="id"/>
    <result property="username" column="username"/>
    <association property="dept" column="dept_id" javaType="Dept" select="selectDeptById" fetchType="lazy"/>
</resultMap>

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<resultMap id="userMap" type="User">
    <id property="id" column="id"/>
    <result property="username" column="username"/>
    <association property="dept" column="dept_id" javaType="Dept" select="selectDeptById" fetchType="eager"/>
</resultMap>

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