求教：mybatis3动态更新sql使用trim+if方式，更新不成功

曾鹏发布于 2014/05/21 19:02

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动态sql如下：

<update id="updateCoverFront" parameterType="com.iflytek.ichang.dc.domain.cover.Cover">
update Cover
<trim prefix="SET" suffixOverrides=",">
<if test="coverfrontid != null and coverfrontid != ''">
CoverFrontID=#{coverfrontid},
</if>
<if test="playstyleid != null and playstyleid != ''">
PlayStyleID=#{playstyleid}
</if>
</trim>
where CoverID=#{coverid}
</update>

运行程序执行上述动态SQL更新不成功，但是没报错。烦请各位帮我看看使用trim+if方式组装动态sql，像上面这样写有没有问题，请指点！谢谢

@曾鹏：这个问题非常怪异，如下形式却能更新成功 <update id="updateCoverInfoStat" parameterType="java.util.HashMap"> update CoverInfoStat <trim prefix="SET" suffixOverrides=","> <if test="replayCount != null and replayCount != ''"> ReplayCount=#{replayCount}, </if> <if test="commentsCount != null and commentsCount != ''"> GetCommentsCount=#{commentsCount}, </if> <if test="flowersCount != null and flowersCount != ''"> GetFlowersCount=#{flowersCount}, </if> </trim> where CoverID=#{coverId} </update> 难道是参数是实体不行，是map才可以吗？ (2014/05/21 19:30)