<resultMap type="Answer" id="answer"><id property="id" column=""/><result property="answer" column=""/><collection property="oid" ofType="int"><constructor><arg column=""/></constructor></collection><collection property="name" ofType="string"><constructor><arg column=""/></constructor></collection></resultMap>
通过Integer和String的构造函数注入,具体的字段名称自己对好入座
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