MyBatis 3 提示 Column ‘******‘ specified twice

造成错误的原因是*Mapper.xml 配置文件，insert 语句写入重复字段

错误配置文件展示：

<insert id="insertSelective" parameterType="com.***.domain.SysSetting"> 
    insert into sys_setting 
    <trim prefix="(" suffix=")" suffixOverrides=","> 
      <if test="sid != null"> 
        sid, 
      </if> 
      <if test="sid != null"> 
        sid, 
      </if> 
      <if test="settingType != null"> 
        setting_type, 
      </if> 
      <if test="settingContent != null"> 
        setting_content, 
      </if> 
      <if test="settingFileSid != null"> 
        setting_file_sid, 
      </if> 
      <if test="settingNo != null"> 
        setting_no, 
      </if> 
      <if test="createDt != null"> 
        create_dt, 
      </if> 
      <if test="createBy != null"> 
        create_by, 
      </if> 
       
      <if test="updateBy != null"> 
        update_by, 
      </if> 
    
      <if test="dataType != null"> 
        data_type, 
      </if> 
    </trim> 
    <trim prefix="values (" suffix=")" suffixOverrides=","> 
      <if test="sid != null"> 
        #{sid,jdbcType=VARCHAR}, 
      </if> 
      <if test="settingType != null"> 
        #{settingType,jdbcType=VARCHAR}, 
      </if> 
      <if test="settingContent != null"> 
        #{settingContent,jdbcType=VARCHAR}, 
      </if> 
      <if test="settingFileSid != null"> 
        #{settingFileSid,jdbcType=VARCHAR}, 
      </if> 
      <if test="settingNo != null"> 
        #{settingNo,jdbcType=VARCHAR}, 
      </if> 
      <if test="createDt != null"> 
        #{createDt,jdbcType=TIMESTAMP}, 
      </if> 
      <if test="createBy != null"> 
        #{createBy,jdbcType=VARCHAR}, 
      </if> 
      <if test="updateDt != null"> 
        #{updateDt,jdbcType=TIMESTAMP}, 
      </if> 
      <if test="updateBy != null"> 
        #{updateBy,jdbcType=VARCHAR}, 
      </if> 
      <if test="dataType != null"> 
        #{dataType,jdbcType=VARCHAR}, 
      </if> 
    </trim> 
  </insert>

这份动态xml 配置文件包含两个sid 是导致: Column ‘sid‘ specified twice 错误原因