<mapper namespace="com.keyou.dao.samSystem.SamApplyDao">
<update id="updateRejectSamApply">
UPDATE SAM_APPLY
<trim prefix="set" suffixOverrides=",">
<if test="samApplyRejectInputParam.rejectOpinion!=null">
SAM_APPLY.REJECTOPINION=#{samApplyRejectInputParam.rejectOpinion},
</if>
</trim>
<where>
<if test="samApplyRejectInputParam.applyguid!=null">
SAM_APPLY.APPLYGUID=#{samApplyRejectInputParam.applyguid}
</if>
</where>
</update>
</mapper>
入参对象samApplyRejectInputParam与接口方法中的@param标志的参数对应如
boolean updateRejectSamApply(@Param("samApplyRejectInputParam")SAMApplyRejectInputParam samApplyRejectInputParam);
原文：https://www.cnblogs.com/qingmuchuanqi48/p/14940336.html