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分享<resultMap id="a-result" class="xxx.a">
......
<result property="b" column="关联_id" select="getB"/>
</resultMap>
<resultMap id="b-result" class="xxx.a">
...
<result property="b" column="关联_id" select="getB"/>
</resultMap>
<statement id="getA" parameterClass="int" resultMap="a-result">
select * from table_a where id = #value#
</statement>
<statement id="getB" parameterClass="int" resultMap="b-result">
select * from table_a where id = #value#
</statement>