mybatis 动态update语句

<update id="updateOne" parameterType="com.inspur.search.data.EntityRelation">

    UPDATE ENTITY_RELATION

        <trim prefix="set" suffixOverrides=",">

        <if test="srcId!=null">SRC_ID=#{srcId},</if>

        <if test="srcType!=null">SRC_TYPE=#{srcType},</if>

        <if test="destId!=null">DEST_ID=#{destId},</if>

        <if test="destType!=null">DEST_TYPE=#{destType},</if>

        <if test="relType!=null">REL_TYPE=#{relType},</if>

        <if test="status!=null">STATUS=#{status},</if>

        <if test="snId!=null">SN_ID=#{snId},</if>

    </trim>

    WHERE id=#{id}

</update>